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Sample records for dental arch relationships

  1. Dental arch diameters and relationships to oral habits.

    Science.gov (United States)

    Aznar, T; Galán, A F; Marín, I; Domínguez, A

    2006-05-01

    The objective was to analyze variations in dental arch width in relation to oral habits. Maxillary and mandibular intercanine and intermolar distance were determined in relation to certain oral habits in 1297 children (ages 3 to 6 years). After an oral examination, the parents of each child completed a questionnaire about oral habits, including the use of a dummy or a bottle (or both), finger sucking, mouth breathing, breast- or bottle-feeding, and duration of these habits. Data were subjected to statistical analysis by the chi-square test for qualitative variables and analysis of variance for quantitative variables with homogeneous variances. Statistical significance was P habits, the maxillary intercanine distance was less in children who used a dummy, especially one of a round design (P = .003). The maxillary intercanine distance was also less in children who breathed through their mouth (P = .002). In most cases, dummy use and mouth breathing were associated with a reduction in the intercanine distance in the maxillary arch. A dummy habit leads to a reduction in maxillary arch width, and mouth breathing causes a reduction in the size of both arches.

  2. Predictors of poor dental arch relationship in young children with unilateral cleft lip and palate.

    Science.gov (United States)

    Hsieh, Yuh-Jia; Liao, Yu-Fang; Shetty, Akshai

    2012-08-01

    The aim of this cross-sectional outcome study using retrospective data capture of treatment histories was to examine the characteristics of young children with unilateral cleft lip and palate who had poor dental arch relationship (i.e., Goslon 5). The study sample comprised 120 children born with nonsyndromic complete unilateral cleft lip and palate between 1995 and 2003, and were aged between 5.0 and 7.0 years (mean age, 5.1 years) at the time of data collection. The dental arch relationship was assessed using the Goslon yardstick from intraoral dental photographs. An independent investigator recorded treatment histories from the clinical notes. The inter- and intraexaminer agreements evaluated by weighted kappa statistics were high. There was no association between dental arch relationship and the type of presurgical orthopedics or pharyngeal flap. Dental arch relationship was associated with the initial cleft size (odds ratio, OR = 1.3; 95% confidence interval, CI = 1.1-1.5, p palate repair (OR = 5.0, 95% CI = 1.2-19.9, p cleft, high-volume surgeon, and primary gingivoperiosteoplasty are predictors of poor dental arch relationship outcome in young children with unilateral cleft lip and palate. These findings may improve treatment outcome by modifying the treatment protocol for patients with unilateral cleft lip and palate.

  3. Relationship between Dental Arch Dimensions and Vertical Facial Morphology in Class I Subjects

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    Amit Kumar Khera

    2012-01-01

    Results: The results showed that, for both males and females, there was a trend that as vertical facial height increased, arch width, arch perimeter and overbite decreased but palatal height and curve of Spee increased and males have significantly larger arch dimensions than those of females. Conclusion: It was concluded that dental arch dimensions were associated with facial vertical morphology and gender. Thus, using individualized archwires according to each patient′s pretreatment arch form and width is suggested during orthodontic treatment.

  4. A new yardstick for rating dental arch relationship in patients with complete bilateral cleft lip and palate

    NARCIS (Netherlands)

    Ozawa, T.O.; Shaw, W.C.; Katsaros, C.; Kuijpers-Jagtman, A.M.; Hagberg, C.; Ronning, E.; Semb, G.

    2011-01-01

    Objective: To develop yardsticks for assessment of dental arch relationship in young individuals with repaired complete bilateral cleft lip and palate appropriate to different stages of dental development. Participants: Eleven cleft team orthodontists from five countries worked on the projects for 4

  5. Evaluation of facial morphology and sagittal relationship between dental arches in primary and mixed dentition.

    Science.gov (United States)

    Traldi, Aline; Valdrighi, Heloísa Cristina; de Souza, Luciane Zanin; Vedovello, Silvia Amélia Scudeler

    2015-01-01

    To assess facial morphology (Pattern) and sagittal relationship between dental arches (Class), and establish a potential association between them and the variables sex, age and ethnicity, among schoolchildren aged between 4 and 9 years old (mean age of 6.7 years) in primary and mixed dentitions. The sample comprised 875 children (457 males and 418 females) attending schools in Descalvado, São Paulo, Brazil. An attempt was made with a view to establish a potential association between children's morphological features with sex, age and ethnicity. Descriptive analysis revealed a predominance of facial Pattern I (69.9 %) and Class I (67.4 %). Statistical tests (p Afro-descendant subjects.

  6. Evaluation of sexual dimorphism and the relationship between craniofacial, dental arch and masseter muscle characteristics in mixed dentition

    OpenAIRE

    Marquezin, Maria Carolina Salomé; Andrade, Annicele da Silva; Rossi, Moara de; Gameiro, Gustavo Hauber; Gavião, Maria Beatriz Duarte; Castelo,Paula Midori

    2014-01-01

    Purpose: to evaluate sexual dimorphism and the relationship between craniofacial characteristics, dental arch morphology and masseter muscle thickness in children in the mixed dentition stage. Methods: the study sample comprised 32 children, aged 6-10 years (14♀/18♂) with normal occlusion. Craniofacial characteristics, dental morphology and masseter muscle thickness were evaluated by means of posteroanterior cephalometric radiographs, dental cast evaluation and ultrasound exam, respectively. ...

  7. Evaluation of facial morphology and sagittal relationship between dental arches in primary and mixed dentition

    Directory of Open Access Journals (Sweden)

    Aline Traldi

    2015-08-01

    Full Text Available OBJECTIVE: To assess facial morphology (Pattern and sagittal relationship between dental arches (Class, and establish a potential association between them and the variables sex, age and ethnicity, among schoolchildren aged between 4 and 9 years old (mean age of 6.7 years in primary and mixed dentitions.METHODS: The sample comprised 875 children (457 males and 418 females attending schools in Descalvado, São Paulo, Brazil. An attempt was made with a view to establish a potential association between children's morphological features with sex, age and ethnicity.RESULTS: Descriptive analysis revealed a predominance of facial Pattern I (69.9 % and Class I (67.4 %. Statistical tests (p < 0.001 showed that Class I was more frequent among Pattern I children, whereas Class II prevailed among Pattern II, and Class III was frequent among Pattern I and III children. Ethnicity was the only variable associated with facial pattern.CONCLUSIONS: Results suggest that facial pattern and sagittal relationship between dental arches tend to be correlated. Ethnicity was associated with facial pattern, with Pattern I being the most recurrent among Caucasians and facial Pattern II being recurrent among Afro-descendant subjects.

  8. Dental crowding in primary dentition and its relationship to arch and crown dimensions among preschool children of Davangere.

    Science.gov (United States)

    Prabhakar, A R; Ravi, G R; Kurthukoti, Ameet J; Shubha, A B

    2008-01-01

    The purpose of the present study was to evaluate dental crowding in the deciduous dentition and its relationship to the crown and the arch dimensions among preschool children of Davangere. Stratified randomized selection of one hundred, 3-4 year old healthy children with all primary teeth erupted was done and divided into two groups. One group had children with anterior crowding in both the arches while the other had spacing. Alginate impressions of the upper and lower arches were made and the study casts were obtained. The tooth and arch dimensions were determined. Mesiodistal dimensions of all the teeth were significantly larger in the crowded arch group. However, the buccolingual dimensions of the maxillary right central incisor, mandibular lateral incisors and the maxillary molars and the crown shape ratio of maxillary lateral incisors, mandibular canines and mandibular right second molar was statistically different. No significant correlation was found between the arch width and the presence of crowding of deciduous dentition. The arch depth of the spaced dentition was greater when compared to the crowded ones. The arch perimeter of the crowded arches was significantly less than the spaced arches.

  9. Rating dental arch relationships and palatal morphology with the EUROCRAN index on three different formats of dental casts in children with unilateral cleft lip and palate

    NARCIS (Netherlands)

    Sabelis, A.J.; Kuijpers, M.A.; Nada, R.M.; Chiu, Y.T.; Bronkhorst, E.M.; Kuijpers-Jagtman, A.M.; Fudalej, P.S.

    2016-01-01

    BACKGROUND: The EUROCRAN index has been used in inter-center studies to assess dental arch relationship (DAR) and palatal morphology (PM) in children with unilateral cleft lip and palate (UCLP). For this type of inter-center research, a scoring method that could be performed over the internet would

  10. Dental arch relationship in children with complete unilateral cleft lip and palate following one-stage and three-stage surgical protocols

    NARCIS (Netherlands)

    Fudalej, P.S.; Katsaros, C.; Bongaarts, C.; Dudkiewicz, Z.; Kuijpers-Jagtman, A.M.

    2011-01-01

    The objective of this study is to compare dental arch relationship following one-stage and three-stage surgical protocols of unilateral cleft lip and palate. Dental casts of 61 children (mean age, 11.2 years; SD, 1.7), consecutively treated in one center with one-stage closure of the complete cleft

  11. Transverse dental arch relationship at 9 and 12 years in children with unilateral cleft lip and palate treated with infant orthopedics: a randomized clinical trial (DUTCHCLEFT).

    Science.gov (United States)

    Noverraz, R L M; Disse, M A; Ongkosuwito, E M; Kuijpers-Jagtman, A M; Prahl, C

    2015-12-01

    A long-term evaluation to assess the transverse dental arch relationships at 9 and 12 years of age in unilateral cleft lip and palate treated with or without infant orthopedics (IO). The hypothesis is that IO has no effect on the transverse dental arch relationship. A prospective two-arm randomized controlled trial (DUTCHCLEFT) in three academic cleft palate centers (Amsterdam, Nijmegen and Rotterdam, the Netherlands). Fifty-four children with complete unilateral cleft lip and palate and no other malformations were enrolled in this evaluation. One group wore passive maxillary plates (IO+) during the first year of life, and the other group did not (IO-). Until the age of 1.5, all other interventions were the same. Hard palate was closed simultaneously with bone grafting according to protocol of all teams. Orthodontic treatment was performed when indicated. The transverse dental arch relationship was assessed on dental casts using the modified Huddart/Bodenham score to measure the maxillary arch constriction at 9 and 12 years of age. No significant differences were found between the IO+ and IO- groups. Differences between the centers increased from 9 to 12 years of age. Transverse dental arch relationships at 9 and 12 years of age do not differ between children with UCLP treated with or without IO. There is no orthodontic need to perform IO as applied in this study in children with UCLP.

  12. Occlusal stability in shortened dental arches.

    Science.gov (United States)

    Witter, D J; Creugers, N H; Kreulen, C M; de Haan, A F

    2001-02-01

    Shortened dental arches consisting of anterior and premolar teeth have been shown to meet oral functional demands. However, the occlusal stability may be at risk as a result of tooth migration. The aim of this nine-year study was to investigate occlusal stability in shortened dental arches as a function over time. Occlusal stability indicators were: 'interdental spacing', 'occlusal contacts of anterior teeth in Intercuspal Position', 'overbite', 'occlusal tooth wear', and 'alveolar bone support'. Subjects with shortened dental arches (n = 74) were compared with subjects with complete dental arches (controls, n = 72). Repeated-measurement regression analyses were applied to assess age-dependent variables in the controls and to relate the occlusal changes to the period of time since the treatment that led to the shortened dental arches. Compared with complete dental arches, shortened dental arches had similar overbite and occlusal tooth wear. They showed more interdental spacing in the premolar regions, more anterior teeth in occlusal contact, and lower alveolar bone scores. Since the differences remained constant over time, we conclude that shortened dental arches can provide long-term occlusal stability. Occlusal changes were self-limiting, indicating a new occlusal equilibrium.

  13. Dental Arch Dimension of Malay Ethnic Group

    Directory of Open Access Journals (Sweden)

    H. A. Mohammad

    2011-01-01

    Full Text Available Problem statement: Many previous studies tried to define and put specific measurements for dental arches dimension in different ethnics groups. However, these studies may be specific to an ethnic group and cannot always be applied to other ethnic types. The aim of this study: is to obtain specific dental arch dimensions for Malaysian Malay ethnic groups and compare between both genders. Approach: Involved clinical examination, collection and analysis of 60 dental cast of Malaysian Malay subjects from pure ethnic group (30 males and 30 females, 20-24 years old. All dental landmarks were located and determined and subsequently measurements had been done according to specific points have been selected. Statistical analysis were done using t-test. Results: Dental arch dimension were established in normal occlusion for Malaysian Malay ethnic group in this study. No significant difference was observed in arch dimensions between male and female of Malaysian Malay. Conclusion: These measurement should be considered during treatment, especially in prosthodontics and orthodontics where arch dimension can be modified appreciably.

  14. Relationship among Lower Arch Length, Arch Width and Arch Perimeter in Crowding and Non-Crowding Groups

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    Selmani Mimoza

    2015-03-01

    Full Text Available Crowding is one of the causes of class I malocclusion. The purpose of the present study was to examine the relationship between arch length, arch width and arch perimeter in crowded and non-crowded arches, as well as to made comparison of the right and left sides between them and to find out the contributing factor in lower arch crowding. The study groups consisted of 60 subjects aged 16 to 21 years. First group consisted of 30 pairs of dental study models with class I normal occlusion. The second group consisted of 30 pairs of study models with class I crowding. Measurements of arch length and width were made as defined by Lavelle and Foster, using Korkhaus callipers. Arch perimeter was measured by Lundstrom method’s using manual calliper with sharp points. Differences between these measurements were made by Mann-Whitney U test (Z/U.

  15. Dental arch relationships on three-dimensional digital study models and conventional plaster study models for patients with unilateral cleft lip and palate.

    Science.gov (United States)

    Asquith, J A; McIntyre, G T

    2012-09-01

    To determine if three-dimensional (3D) digital study models could replace plaster study models for the evaluation of dental arch relationships for patients with unilateral cleft lip and palate. Observational study involving plaster study models from a records archive. U.K. National Health Service. Thirty sets of study models of 5-year-old patients with unilateral cleft lip and palate were identified and scanned to produce 3D digital study models by ESM Digital Solutions Ltd. (Swords, Co. Dublin, Ireland) using an R250 Orthodontic Study Model Scanner (3Shape A/S, Copenhagen, Denmark). None. The plaster and 3D digital study models were scored using the 5-year-olds' and modified Huddart Bodenham indices and analyzed using the Friedman test (p plaster and 3D digital models. Intra-observer and interobserver reproducibility were good (0.62 to 0.83 and 0.64 to 0.78, respectively). There were no statistically significant differences between the scores for the 3D digital study models when compared to the plaster study models for either the 5-year-olds' index (p  =  .12) or for the modified Huddart Bodenham index (p  =  .506). Three-dimensional digital models are a valid alternative to traditional plaster study models for the evaluation of dental arch relationships in patients with unilateral cleft lip and palate.

  16. Description of dental arch form using the Fourier series.

    Science.gov (United States)

    Valenzuela, A Patricia; Pardo, Marco A; Yezioro, Salomon

    2002-01-01

    The aim of this study was to describe the form of the human superior dental arch using Fourier transformations. Forty models made in dental stone from impressions of the maxillary dental arch were used to obtain the reference data, which were expressed in Cartesian coordinates, from the mesovestibular cuspid vertices of molar teeth, vestibular cuspid of premolars, and incisal edge. Fourth-grade equations and Fourier series were calculated from these data. The results indicate that Fourier series more precisely express the form and size of different dental arches, with mixed or permanent dentition, than fourth-grade equations. Details of the mathematical procedure and the precision obtained were provided.

  17. Knowledge and attitudes of dentists toward shortened dental arch ...

    African Journals Online (AJOL)

    2015-08-03

    Aug 3, 2015 ... Key words: Attitude, dentist, knowledge, shortened dental arch. Date of Acceptance: ... practice of SDA therapy among dentists in Saudi Arabia, no studies are available in ..... partial denture was similar. Therefore, the attitude ...

  18. THE ETIOLOGICAL FACTORS INVOLVED IN DENTAL ARCH PERIMETER SHORTENING

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    Liliana Ioana Vâţă

    2012-12-01

    Full Text Available The main purpose of the study was to highlight the causes that may lead to reduction of arches: early loss of deciduous teeth, with consecutive dental drifting on the arch, followed by narrowing of the space necessary for the eruption of successional teeth, caries of the deciduous teeth or ectopic eruption of the first permanent molars. The mesial position of M1 had a frequency of 19.31% of the total number of analysed cases; maximum frequencies have been registered for the localization on the lower arch; M1 ectopia has rarely occurred on the studied batch; the frequency of lateral group mesial position was of 10.34% on the studied batch, registering maximum values for the localisation on the upper arch. The early loss of deciduous teeth was identified in almost 30% of the analysed cases, while the reduction of the space necessary for the eruption of successional teeth was registered in almost 39% of cases, space narrowing resulting both from the caries of deciduous teeth and from their early loss.

  19. Automatic dental arch detection and panoramic image synthesis from CT images.

    Science.gov (United States)

    Sa-Ing, Vera; Wangkaoom, Kongyot; Thongvigitmanee, Saowapak S

    2013-01-01

    Due to accurate 3D information, computed tomography (CT), especially cone-beam CT or dental CT, has been widely used for diagnosis and treatment planning in dentistry. Axial images acquired from both medical and dental CT scanners can generate synthetic panoramic images similar to typical 2D panoramic radiographs. However, the conventional way to reconstruct the simulated panoramic images is to manually draw the dental arch on axial images. In this paper, we propose a new fast algorithm for automatic detection of the dental arch. Once the dental arch is computed, a series of synthetic panoramic images as well as a ray-sum panoramic image can be automatically generated. We have tested the proposed algorithm on 120 CT axial images and all of them can provide the decent estimate of the dental arch. The results show that our proposed algorithm can mostly detect the correct dental arch.

  20. Effects of removable dental prostheses on masticatory performance of subjects with shortened dental arches: A systematic review

    NARCIS (Netherlands)

    Liang, S.; Zhang, Q.; Witter, D.J.; Wang, Y.; Creugers, N.H.J.

    2015-01-01

    OBJECTIVE: To synthesise data on the effects of distal-extension removable dental prostheses (RDPs) on masticatory performance of subjects with (extreme) shortened dental arches ((E)SDAs). DATA: Search terms were: 'masticatory' respectively 'chewing' combined with 'performance', 'efficiency', or

  1. Is there any association between facial type and mandibular dental arch form in subjects with normal occlusion?

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    Luiz Renato Paranhos

    2014-03-01

    The aim of this study was investigate the association between the mandibular arch morphology and the facial type of Brazilian Caucasians with natural normal occlusion. For this, we used a sample comprised of lateral radiographs and respective dental casts of 51 individuals (21 male and 30 female, presenting at least 4 of the 6 Andrews’ keys to normal occlusion without previous orthodontic treatment. Angle’s first molar relationship was considered indispensable for the sample. The facial type was defined by two cephalometric measurements (SN.SGn and SN.GoGn. After scanning the models (3D and radiographs, the images were evaluated by 12 orthodontists. A modified Kappa test evaluated the agreement between examiners to classify the morphology of the dental arch. The chi-square test was used to verify the association between the facial type (dolichofacial, mesofacial, or brachyfacial and the dental arch morphology (square, oval, or tapered, using significance level of 5%. Casual and systematic errors (p > 0.05 showed no significant results and the Kappa test showed significant agreement among examiners for the dental arch form (0.55 with a p < 0.001, considered as ‘moderate’. The chi-square test indicated no significant association. The null hypothesis was accepted, as the facial type was not associated with dental arch morphology in individuals with normal occlusion.

  2. CORRELATION BETWEEN DURATION OF BOTTLE-FEEDING AND DENTAL ARCH MEASUREMENT IN DECIDUOUS DENTITION

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    Meldo Mahniza

    2015-06-01

    Full Text Available The purpose of this study was to observe the correlation between duration of bottle feeding and dental arch measurement in deciduous dentition. Duration of bottle feeding was divided into 4 groups: ≤ 24 months, 25 – 36 months, 37 – 48 months, and > 48 months. The subjects were 120 kindergarten pupils, aged 3 – 5 years old. Measurements was done on the models of maxilla and mandible with digital caliper for the width and length of dental arch and using flexible curve for dental arch circumference. Pearson correlation showed a weak association for anterior arch width (r=0.206, posterior arch width (r=0.195, and anterior circumference (r=0.206 of maxilla and posterior arch width (r=0.279, anterior circumference (r=0.226 of mandible. One-way Anova was performed to analyze the differences of dental arch measurements among duration of bottle-feeding groups. The results showed that there were significant differences of dental arch measurements for anterior arch width of maxilla, posterior arch width of mandible, and anterior circumference of mandible (p<0,05.

  3. [Effect of dental arch length decrease during orthodontic treatment in the upper airway development. A review].

    Science.gov (United States)

    Haddad, Stéphanie; Kerbrat, Jean-Baptiste; Schouman, Thomas; Goudot, Patrick

    2017-03-01

    A possible relation between an upper airway space decrease and the development of obstructive sleep apnea syndrom explains the importance to know the effect of the modification of dental arch length on the upper airway during orthodontic treatment. The aim of this article is to expose recent knowledge about upper airway development and dental arch length decrease factors, to determine the influence of this decrease on upper airway development. A review was done to determine the upper airway normal development, to define dental arch to specify if an ideal position of dental arch on apical base exists. All of the length dental arch decrease factors during orthodontic treatment (dental extraction, dental agenesis and dental malpositions) and their upper airway resounding were searched. Some authors found a diminution of upper airway space after premolars extractions while others didn't found this diminution after extractions premolars when incisor retraction is finished. A decrease of transversal maxillary diameter and nasal cavity may be due to absence of permanent teeth. The effect of dental arch length decrease during orthodontic treatment in the upper airway development was not scientifically proved. However we had to be vigilant and adapt our orthodontic treatment case by case to avoid an upper airway modification. © EDP Sciences, SFODF, 2017.

  4. The association between dental arch dimensions and occurrence of Finnish dental consonant misarticulations in cleft lip/palate children.

    Science.gov (United States)

    Laitinen, J; Ranta, R; Pulkkinen, J; Haapanen, M L

    1998-10-01

    The aim of this study was to examine whether maxillary and mandibular dental arch width, length, and palatal height dimensions are associated with the occurrence of misarticulations (phonetic or phonologic errors) in the dental consonants /r/, /s/, and /1/ in different cleft types and sexes. The subjects were 263 (109 girls, 154 boys) 6-year-old Finnish-speaking non-syndromic children with isolated cleft palate (CP, n=79), deft lip/alveolus (CL(A), n=77), unilateral (UCLP, n=80), and bilateral (BCLP, n=27) cleft lip and palate. Dental plaster casts were measured by two authors using the technique of Moorrees, and auditive speech was analyzed with high reliability by two speech pathologists. The results showed that the occurrence of misarticulations increased and dental arch dimensions decreased with the severity of the cleft. Narrower and shorter maxillary arches as well as shallower palates were related to problems with the studied dental consonants. Mandibular arch dimensions were not related to the misarticulations. However, statistical analysis did not reveal significant differences in dental arch dimensions between subjects with and without misarticulations when they were compared separately for different cleft types. The etiology of clefting per se--isolated deft palate versus cleft lip with or without deft palate--did not seem to explain the associations between dental arch dimensions and the studied misarticulations.

  5. Correlation Between Maxillary Central Incisor Crown Morphology And Mandibular Dental Arch Form In Normal Occlusion Subjects

    OpenAIRE

    Paranhos, Luiz Renato; Lima,Carolina Souto; Silva,Ricardo Henrique Alves da; Daruge Júnior,Eduardo; Torres,Fernando Cesar

    2012-01-01

    The aim of this study was to evaluate the correlation between the morphology of the mandibular dental arch and the maxillary central incisor crown. Cast models from 51 Caucasian individuals, older than 15 years, with optimal occlusion, no previous orthodontic treatment, featuring 4 of the 6 keys to normal occlusion by Andrews (the first being mandatory) were observed. The models were digitalized using a 3D scanner, and images of the maxillary central incisor and mandibular dental arch were ob...

  6. MATHEMATICAL ANALYSIS OF DENTAL ARCH OF CHILDREN IN NORMAL OCCLUSION: A LITERATURE REVIEW

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    M. Abu-Hussein DDS, MScD, MSc, DPD

    2012-03-01

    Full Text Available AIM. This paper is an attempt to compare and analyze the various mathematical models for defining the dental arch curvature of children in normal occlusion based upon a review of available literature. Background. While various studies have touched upon ways to cure or prevent dental diseases and upon surgical ways for teeth reconstitution to correct teeth anomalies during childhood, a substantial literature also exists, attempting to mathematically define the dental arch of children in normal occlusion. This paper reviews these dental studies and compares them analytically. Method. The paper compares the different mathematical approaches, highlights the basic assumptions behind each model, underscores the relevancy and applicability of the same, and also lists applicable mathematical formulae. Results. Each model has been found applicable to specific research conditions, as a universal mathematical model for describing the human dental arch still eludes satisfactory definition. The models necessarily need to include the features of the dental arch, such as shape, spacing between teeth and symmetry or asymmetry, but they also need substantial improvement. Conclusions. While the paper shows that the existing models are inadequate in properly defining the human dental arch, it also acknowledges that future research based on modern imaging techniques and computeraided simulation could well succeed in deriving an allinclusive definition for the human dental curve till now eluding the experts.

  7. Correlation between maxillary central incisor crown morphology and mandibular dental arch form in normal occlusion subjects.

    Science.gov (United States)

    Paranhos, Luiz Renato; Lima, Carolina Souto; da Silva, Ricardo Henrique Alves; Daruge Júnior, Eduardo; Torres, Fernando Cesar

    2012-01-01

    The aim of this study was to evaluate the correlation between the morphology of the mandibular dental arch and the maxillary central incisor crown. Cast models from 51 Caucasian individuals, older than 15 years, with optimal occlusion, no previous orthodontic treatment, featuring 4 of the 6 keys to normal occlusion by Andrews (the first being mandatory) were observed. The models were digitalized using a 3D scanner, and images of the maxillary central incisor and mandibular dental arch were obtained. These were printed and placed in an album below pre-set models of arches and dental crowns, and distributed to 12 dental surgeons, who were asked to choose which shape was most in accordance with the models and crown presented. The Kappa test was performed to evaluate the concordance among evaluators while the chi-square test was used to verify the association between the dental arch and central incisor morphology, at a 5% significance level. The Kappa test showed moderate agreement among evaluators for both variables of this study, and the chi-square test showed no significant association between tooth shape and mandibular dental arch morphology. It may be concluded that the use of arch morphology as a diagnostic method to determine the shape of the maxillary central incisor is not appropriate. Further research is necessary to assess tooth shape using a stricter scientific basis.

  8. Edentulism and shortened dental arch in Brazilian elderly from the National Survey of Oral Health 2003

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    Marco Túlio Freitas Ribeiro

    2011-10-01

    Full Text Available OBJECTIVE: To describe the distribution of edentulism and estimate the prevalence of functional dentition and shortened dental arch among elderly population. METHODS: A population-based epidemiological study was carried out with a sample of 5,349 respondents aged 65 to 74 years obtained from the 2002 and 2003 Brazilian Ministry of Health/Division of Oral Health survey database. The following variables were studied: gender; macroregion of residence; missing teeth; percentage that met the World Health Organization goal for oral health in the age group 65 to 74 years (50% having at least 20 natural teeth; presence of shortened dental arch; number of posterior occluding pairs of teeth. The Chi-square test assessed the association between categorical variables. The Kruskal-Wallis and Mann-Whitney tests were used to assess differences of mean between number of posterior occluding pairs teeth, macro-region and gender. RESULTS: The elderly population had an average of 5.49 teeth (SD: 7.93 with a median of 0. The proportion of completely edentulous respondents was 54.7%. Complete edentulism was 18.2% in the upper arch and 1.9% in the lower arch. The World Health Organization goal was achieved in 10% of all respondents studied. However, only 2.7% had acceptable masticatory function and aesthetics (having at least shortened dental arch and a mean number of posterior occluding pairs of 6.94 (SD=2.97. There were significant differences of the percentage of respondents that met the World Health Organization goal and presence of shortened dental arch between men and women. There were differences in shortened dental arch between macroregions. CONCLUSIONS: The Brazilian epidemiological oral health survey showed high rate of edentulism and low rate of shortened dental arch in the elderly population studied, thus suggesting significant functional and aesthetic impairment in all Brazilian macroregions especially among women.

  9. Decayed/missing/filled teeth and shortened dental arches in Tanzanian adults.

    NARCIS (Netherlands)

    Sarita, P.T.N.; Witter, D.J.; Kreulen, C.M.; Matee, M.I.N.; Hof, M.A. van 't; Creugers, N.H.J.

    2004-01-01

    PURPOSE: This study assessed decayed/missing/filled teeth (DMFT), presence of occlusal units, and prevalence of shortened dental arches in a Tanzanian adult population. MATERIALS AND METHODS: The dental state of samples of the Tanzanian population was studied. Oral examinations were conducted on

  10. Decayed/missing/filled teeth and shortened dental arches in Tanzanian adults.

    NARCIS (Netherlands)

    Sarita, P.T.N.; Witter, D.J.; Kreulen, C.M.; Matee, M.I.N.; Hof, M.A. van 't; Creugers, N.H.J.

    2004-01-01

    PURPOSE: This study assessed decayed/missing/filled teeth (DMFT), presence of occlusal units, and prevalence of shortened dental arches in a Tanzanian adult population. MATERIALS AND METHODS: The dental state of samples of the Tanzanian population was studied. Oral examinations were conducted on 5,5

  11. Effects of unilateral premolar extraction treatment on the dental arch forms of Class II subdivision malocclusions.

    Science.gov (United States)

    Dahiya, Ginu; Masoud, Ahmed I; Viana, Grace; Obrez, Ales; Kusnoto, Budi; Evans, Carla A

    2017-08-01

    A retrospective study evaluating posttreatment symmetry in dental arch form and midlines was carried out in Class II subdivision patients treated with unilateral and bilateral maxillary premolar extractions. Using Geomagic (version 14; Geomagic, Research Triangle Park, NC) and MATLAB (version 8.4; MathWorks, Natick, Mass) software, best-fit curves expressed as quartic polynomials were generated for 13 Class II subdivisions treated with unilateral extractions and 20 treated with bilateral maxillary premolar extractions. Transverse and sagittal measurements were recorded to assess symmetry. Dental models were superimposed on constructed reference planes to generate average posttreatment arches. Statistical comparisons were performed with the significance level set at P ≤0.05. The unilateral extraction group showed significant differences in transverse arch forms between the right and left sides in the anterior, anterior-middle, and middle segments of the arch, and all regions other than the posterior segment in the sagittal dimension. Significant differences were found between groups in the anterior and anterior-middle segments of the arch transversely, the middle and middle-posterior segments sagittally, and the midline deviation relative to the midsagittal plane. Superimposed average arches showed similar results. Unilateral maxillary extraction treatment generally results in a narrower and more posteriorly displaced arch form on the extraction side, with a deviated maxillary midline toward the extraction side of the arch. Copyright © 2017 American Association of Orthodontists. Published by Elsevier Inc. All rights reserved.

  12. Transversal changes in dental arches from non-extraction treatment with self ligating brackets

    OpenAIRE

    Liliana Avila Maltagliati; Yasushi Inoue Myiahira; Liana Fattori; Leopoldino Capelozza Filho; Mauricio Cardoso

    2013-01-01

    OBJECTIVE: The present study aimed at analyzing, with the use of dental casts, the transverse changes of the upper and lower dental arches, after non-extraction orthodontic treatment, with self-ligating brackets. METHODS: The sample comprised 29 patients, all presenting Class I malocclusion with upper and lower crowding of at least 4 mm and treated only with a fixed appliance, without stripping, extraction or distalization. The dental casts were obtained before and after leveling with 0.019 x...

  13. An observational cohort study on shortened dental arches--clinical course during a period of 27-35 years

    NARCIS (Netherlands)

    Gerritsen, A.E.; Witter, D.J.; Bronkhorst, E.M.; Creugers, N.H.J.

    2013-01-01

    OBJECTIVES: The objective of this study was to investigate the clinical course of shortened dental arches ('SDA group') compared to SDAs plus removable denture prosthesis ('SDA plus RDP group') and complete dental arches ('CDA group', controls). MATERIALS AND METHODS: Data (numbers of direct and

  14. Using biomechanical calculation and experimental measurement to study the relationship between the load and the changes in the shape of the arch-dental shape memory connector%弓齿形状记忆接骨器记忆生物力学计算和实验力学测定

    Institute of Scientific and Technical Information of China (English)

    苏佳灿; 张春才; 禹宝庆; 薛召军; 吴建国; 丁祖泉

    2005-01-01

    BACKGROUND: The biomechanical features of arch-dental shape memory connector designed for fractures in pelvis or the parts adjacent to joints are analyzed through biomechanical calculation and experimental measurements.OBJECTIVE: To explore the relationship between the changes in shape of arch-dental shape memory connector and the load on it.DESIGN: Both biomechanical calculation and the experimental measurement were conducted for mutual supplementation and confirmation.SETTING: The Orthopedic Department of Changhai Hospital Affiliated to the Second Military Medical University of Chinese PLA and the Life Science and Bioengineering College of Tongji University.MATERIALS:The trial was conducted from at Shanghai Changhai Hospital and Life Science Laboratory of Tongji University from April 2002 to April 2004. The subjects were arch-dental shape memory connectors.METHODS: We calculated the stress in and around the fracture face produced by arch-dental shape memory connector according to Moire principle and we also measured the changes in the shape of arch-dental shape memory connector. The relationship between load and the changes in the shape of arch-dental shape memory connector was explored.MAIN OUTCOME MEASURES: To explore whether the results of biomechanical calculation and those of the experimental measurement are consistent.RESULTS: Biomechanical calculation found that the relationship between the load (P) and the displacement(δ) in arch-dental shape memory connector was P = 13.69δ. The experimental measurement found that the load on the connector and the displacement were in a linear relationship.CONCLUSION: The relationship between the load and the displacement in arch-dental shape memory connector was linear within its elastic range and the biomechanical calculation results were consistent with the results of the experimental measurement.%背景:通过记忆生物力学计算和实验测定,分析骨盆骨折和近关节部位弓齿形状记忆合金接骨

  15. Transversal changes in dental arches from non-extraction treatment with self ligating brackets

    Directory of Open Access Journals (Sweden)

    Liliana Avila Maltagliati

    2013-06-01

    Full Text Available OBJECTIVE: The present study aimed at analyzing, with the use of dental casts, the transverse changes of the upper and lower dental arches, after non-extraction orthodontic treatment, with self-ligating brackets. METHODS: The sample comprised 29 patients, all presenting Class I malocclusion with upper and lower crowding of at least 4 mm and treated only with a fixed appliance, without stripping, extraction or distalization. The dental casts were obtained before and after leveling with 0.019 x 0.025-in stainless steel archwires. CONCLUSION: The results indicated that the majority of transverse changes occurred at the premolar areas, both the first and the second, as well as on the upper and lower dental arches. The intercanine distance increased 0.75 mm, on average, in the upper arch and 1.96 mm in the lower arch. The molars also demonstrated a tendency towards an increase in their transverse dimension, however, at a lower intensity comparing to premolars. All measurements presented statistically significant differences with the exception of the maxillary second molars.

  16. Effect of dental arch convexity and type of archwire on frictional forces

    NARCIS (Netherlands)

    Fourie, Zacharias; Ozcan, Mutlu; Sandham, John

    2009-01-01

    Introduction: Friction measurements in orthodontics are often derived from models by using brackets placed on flat models with various straight wires. Dental arches are convex in some areas. The objectives of this study were to compare the frictional forces generated in conventional flat and convex

  17. Effect of dental arch convexity and type of archwire on frictional forces

    NARCIS (Netherlands)

    Fourie, Zacharias; Ozcan, Mutlu; Sandham, John

    Introduction: Friction measurements in orthodontics are often derived from models by using brackets placed on flat models with various straight wires. Dental arches are convex in some areas. The objectives of this study were to compare the frictional forces generated in conventional flat and convex

  18. Comparative study of dental arch width in plaster models, photocopies and digitized images

    Directory of Open Access Journals (Sweden)

    Maria Cristina Rosseto

    2009-06-01

    Full Text Available The aim of this study was to comparatively assess dental arch width, in the canine and molar regions, by means of direct measurements from plaster models, photocopies and digitized images of the models. The sample consisted of 130 pairs of plaster models, photocopies and digitized images of the models of white patients (n = 65, both genders, with Class I and Class II Division 1 malocclusions, treated by standard Edgewise mechanics and extraction of the four first premolars. Maxillary and mandibular intercanine and intermolar widths were measured by a calibrated examiner, prior to and after orthodontic treatment, using the three modes of reproduction of the dental arches. Dispersion of the data relative to pre- and posttreatment intra-arch linear measurements (mm was represented as box plots. The three measuring methods were compared by one-way ANOVA for repeated measurements (α = 0.05. Initial / final mean values varied as follows: 33.94 to 34.29 mm / 34.49 to 34.66 mm (maxillary intercanine width; 26.23 to 26.26 mm / 26.77 to 26.84 mm (mandibular intercanine width; 49.55 to 49.66 mm / 47.28 to 47.45 mm (maxillary intermolar width and 43.28 to 43.41 mm / 40.29 to 40.46 mm (mandibular intermolar width. There were no statistically significant differences between mean dental arch widths estimated by the three studied methods, prior to and after orthodontic treatment. It may be concluded that photocopies and digitized images of the plaster models provided reliable reproductions of the dental arches for obtaining transversal intra-arch measurements.

  19. Effect of serial extraction alone on crowding: relationships between tooth width, arch length, and crowding.

    Science.gov (United States)

    Yoshihara, T; Matsumoto, Y; Suzuki, J; Sato, N; Oguchi, H

    1999-12-01

    In this study, we examined the effect of serial extraction alone on crowding. We also investigated the relationships between tooth width, arch length, and irregularity index. Maxillary dental casts from 32 subjects who had undergone only serial extraction were analyzed at 3 stages: before deciduous canines extraction, after first premolars extraction, and at the end of the observation period. The mean of the irregularity index decreased significantly as serial extraction proceeded and further decreased during the observation period. In cases where the width of the incisor was more than 2 standard deviations above the means for the control subjects, there was a significant correlation between tooth width of the lateral incisors and irregularity index before extraction as well as a significant correlation between the summation of tooth widths of the central and lateral incisors and irregularity index at that time. There was a significant negative correlation between arch length discrepancy and irregularity index before extraction and also a significant correlation between arch length discrepancy and correction of the irregularity index from before deciduous canines extraction to after first premolars extraction. These results suggest that tooth width and arch length discrepancy might preferentially affect the degree of anterior crowding in cases of severe crowding. There was no aggravation of the average crowding level during the observation period in the present study. The present study quantitatively suggested that serial extraction was useful for the purpose of correcting crowding in most cases.

  20. Secular changes in tooth size and dental arch dimensions in the mixed dentition.

    Science.gov (United States)

    Lindsten, Rune

    2003-01-01

    Secular changes in the mixed dentition were studied. Permanent tooth size and dental arch dimensions were examined in Norwegian children born in the 1960s and 1980s, Swedish children born in the 1960s and 1980s, Norwegian Sami children born in the 1980s, and a sample of Norwegian skulls dating from the 14th to the 19th century. The Norwegian Sami children were nomadic in the summertime. A sample of pigs was studied before and after a maceration process to determine what dimensional changes might occur in such a process. A shrinkage of 0.3%-1.7% was found. This information was used when the skulls were compared with the modern groups. Lateral dental arch lengths were shorter in the children born in the 1960s compared with the children born in the 1980s. This was a result of the higher prevalence of caries in the second deciduous molars in the 1960s groups. Children who had lost a deciduous canine prematurely were found to have smaller dental arch perimeters. When compared with other data, this was blamed on a pre-existing crowding. Permanent tooth size was smaller in the skulls compared with the modern groups. Improved nutrition is considered to be the main reason for the difference. Relative dental arch space differed in the group born in the 1960s from that in the other groups, indicating a greater prevalence of crowding in the former. Relative dental arch space in the skulls and in the group born in the 1980s was similar. A more traditional way of living, as practised by the Sami group in this thesis, was not favorable for relative dental arch space. The transverse intermaxillary relation in boys changed from the 1960s to the 1980s, which indicated that the 1980s group ran a greater risk of developing a posterior cross-bite. Before the same conclusion could be made in the girls, the mesial drift of the first permanent molars had to be corrected for, because of a higher prevalence of caries in the 1960s group. The sex-pooled analysis of the skulls and the

  1. Effects of Asthma and Inhalation corticosteroids on the dental arch morphology in children

    Directory of Open Access Journals (Sweden)

    S S Kumar

    2012-01-01

    Full Text Available Background: Hereditary, environmental and developmental factors play an important role in dentofacial development, as well as the initiation of malocclusion disorder. Allergic phenomenon such as asthma that induces an alternative mode of breathing in patients is a contributing factor in development of the dental arch. Aim: Our aim in this study was to evaluate the dentoalveolar morphology in asthmatic children and to analyze the effects of asthmatic medications on the dental arch. Setting and Design : This study is centered on 44 asthmatic children aged between 6-12 years from J.S.S Hospital, Mysore. Selected variables from model analysis of the casts of the asthmatic group were subjected to comparison with those of the non-asthmatic group, which comprised of 44 non-asthmatic children. Selected parameters were arch width, arch length and palatal depth. Materials and Methods : Impressions of upper and lower arches were made with rubber based impression material. A sliding digital caliper was used to measure the casts for arch width and arch length. A palatal depth gauge was used to measure the palatal depth. Statistical Analysis : Differences in arch widths, arch lengths and palatal depths between asthmatics and non-asthmatics groups were evaluated by independent sample t-tests. Chi-square test was applied to assess the frequency of occurrence of malocclusion in the asthmatic children. Result: The results obtained revealed that the arch length and palatal depth of asthmatic group had higher values compared to that of non-asthmatic groups for both age groups (6 to 8-year-old males and females, 10 to 12-year-old males and females. Inter molar width showed a significant lower value in asthmatics in the maxillary arches of 10 to 12-year-old females. Fifty percent of the asthmatic children aged 10 to 12-years had open-bite. Children under regular medication showed significant deviation in the dentoalveolar morphology as compared to those under

  2. Is there any association between facial type and mandibular dental arch form in subjects with normal occlusion?

    OpenAIRE

    Luiz Renato Paranhos; Adilson Luiz Ramos; Eduardo de Novaes Benedicto; Liliana Àvila Maltagliati; Maurício de Almeida Cardoso; Leopoldino Capelozza Filho

    2014-01-01

    http://dx.doi.org/10.4025/actascihealthsci.v36i1.17668 The aim of this study was investigate the association between the mandibular arch morphology and the facial type of Brazilian Caucasians with natural normal occlusion. For this, we used a sample comprised of lateral radiographs and respective dental casts of 51 individuals (21 male and 30 female), presenting at least 4 of the 6 Andrews’ keys to normal occlusion without previous orthodontic treatment. Angle’s first molar relationship wa...

  3. Effect of dental arch convexity and type of archwire on frictional forces.

    Science.gov (United States)

    Fourie, Zacharias; Ozcan, Mutlu; Sandham, Andrew

    2009-07-01

    Friction measurements in orthodontics are often derived from models by using brackets placed on flat models with various straight wires. Dental arches are convex in some areas. The objectives of this study were to compare the frictional forces generated in conventional flat and convex dental arch setups, and to evaluate the effect of different archwires on friction in both dental arch models. Two stainless steel models were designed and manufactured simulating flat and convex maxillary right buccal dental arches. Five stainless steel brackets from the maxillary incisor to the second premolar (slot size, 0.22 in, Victory, 3M Unitek, Monrovia, Calif) and a first molar tube were aligned and clamped on the metal model at equal distances of 6 mm. Four kinds of orthodontic wires were tested: (1) A. J. Wilcock Australian wire (0.016 in, G&H Wire, Hannover, Germany); and (2) 0.016 x 0.022 in, (3) 0.018 x 0.022 in, and (4) 0.019 x 0.025 in (3M Unitek GmbH, Seefeld, Germany). Gray elastomeric modules (Power O 110, Ormco, Glendora, Calif) were used for ligation. Friction tests were performed in the wet state with artificial saliva lubrication and by pulling 5 mm of the whole length of the archwire. Six measurements were made from each bracket-wire combination, and each test was performed with new combinations of materials for both arch setups (n = 48, 6 per group) in a universal testing machine (crosshead speed: 20 mm/min). Significant effects of arch model (P = 0.0000) and wire types (P = 0.0000) were found. The interaction term between the tested factors was not significant (P = 0.1581) (2-way ANOVA and Tukey test). Convex models resulted in significantly higher frictional forces (1015-1653 g) than flat models (680-1270 g) (P model, significantly lower frictional forces were obtained with wire types 1 (679 g) and 3 (1010 g) than with types 2 (1146 g) and 4 (1270 g) (P model, the lowest friction was obtained with wire types 1 (1015 g) and 3 (1142 g) (P >0.05). Type 1 wire

  4. Three-dimensional dental arch curvature in human adolescents and adults.

    Science.gov (United States)

    Ferrario, V F; Sforza, C; Poggio, C E; Serrao, G; Colombo, A

    1999-04-01

    The three-dimensional arrangement of dental cusps and incisal edges in human dentitions has been reported to fit the surface of a sphere (the curve of Monson), with a radius of about 4 inches in adults. The objective of the current study was to compare the three-dimensional curvature of the mandibular dental arch in healthy permanent dentitions of young adults and adolescents. The mandibular casts of 50 adults (aged 19 to 22 years) and 20 adolescents (aged 12 to 14 years) with highly selected sound dentitions that were free from temporomandibular joint problems were obtained. The three coordinates of cusp tips excluding the third molars were digitized with a three-dimensional digitizer, and used to derive a spherical model of the curvature of the occlusal surfaces. From the best interpolating sphere, the radii of the left and right curves of Spee (quasi-sagittal plane) and of molar curve of Wilson (frontal plane) were computed. Mandibular arch size (interdental distances) was also calculated. The occlusal curvature of the mandibular arch was not significantly influenced by sex, although a significant effect of age was found (Student t, P curves of Spee, and curve of Wilson in the molar area were about 101 mm in adults, and about 80 mm in adolescents. Arch size was not influenced by either sex or age. The different curvatures of the occlusal plane in adolescents and adults may be explained by a progressive rotation of the major axis of the teeth moving the occlusal plane toward a more buccal position. These dental movements should be performed in a frontal plane on an anteroposterior axis located next to the dental crown.

  5. [Relationship between aortic arch shape and blood pressure response after coarctation repair].

    Science.gov (United States)

    Ou, P; Mousseaux, E; Auriacombe, L; Pédroni, E; Balleux, F; Sidi, D; Bonnet, D

    2005-01-01

    The mechanisms of secondary hypertension after repair of coarctation of the aorta are not well understood. Abnormalities of the architecture of the aortic arch and their consequences on blood pressure have not been studied. In order to study the relationship between abnormalities or aortic arch architecture and resting blood pressure ninety-four patients without re-coarctation were followed up prospectively from 1997 to 2004 (mean age 16.9 +/- 8.1 years; mean weight 57.5 +/- 18.3 Kg; interval since surgery 16.3 +/- 5.4 years). All underwent MRI angiography of the thoracic aorta which enabled the abnormalities to be classified in 3 groups: gothic arch, crenellated arch and roman arch. Twenty-four patients (25.5%) were hypertensive and 70 (74.4%) normotensive. There were 40 gothic arches (42.5%). 14 crenellated arches (15%) and 40 roman arches (42.5%). Gothic arches were more commonly observed in the hypertensive patients (18/40, [45%, 95% CI 31-62]) than the crenellated arches (4/14, [28.5%, 95% CI 7-48]) or the roman arches (2/40, [5%, 95% CI 2-12]). Only the gothic arch was independently correlated with hypertension on multivariate analysis. The authors conclude that gothic deformation of the aortic arch is an independent predictive factor of hypertension in patients operated for coarctation with an excellent result on the isthmic region. Patients with a gothic appearance of their aortic arch should be followed up closely.

  6. Mandibular incisor alignment and dental arch changes 1 year after extraction of deciduous canines.

    Science.gov (United States)

    Sjögren, Anders; Arnrup, Kristina; Lennartsson, Bertil; Huggare, Jan

    2012-10-01

    This study investigated the early effects on mandibular incisor irregularity and rotation together with dental arch dimensions of the extraction of four deciduous canines. Children, during early mixed dentition, were randomized into one extraction (n = 32) and one control (n = 41) group. Dental casts from baseline (T0) and 1 year follow-up (T1) were used to evaluate changes in the irregularity index and in mandibular incisor rotation, dental arch dimensions, overjet, and overbite. Median mandibular incisor irregularity decreased over time, significantly more in the extraction than the control group (1.2 versus 0.7 mm; P extraction group (42 versus 20 per cent; P extraction group versus 34 per cent in the control group (P extraction group (1.3, 1.1 mm and 2.4, 2.0 mm, respectively; P extraction of the deciduous canines, small improvements in mandibular incisor alignment were seen, together with reduced arch dimensions. Little's index underestimated malalignment related to tooth rotation.

  7. Comparison of maxillary and mandibular dental arch forms by studying Fourier series developed from mathematically estimated dentitions.

    Science.gov (United States)

    Mikami, Hiroko; Nakatsuka, Michiko; Iwai, Yasutomo

    2010-11-01

    We conducted a Fourier analysis on data obtained using correlation and principal component analyses of parallel-standardized dental study models; both maxillary and mandibular dental arches were predominantly round square in shape. The present study compared and determined the contribution ratio and reproducible coefficients of amplitudes (factors affecting dental arch forms), and demonstrated that the 1st to 4th and the 1st to 6th Fourier harmonics reproduced maxillary and mandibular dental arch forms, respectively. The correlation analyses of the constant term and amplitudes demonstrated that significant differences in the 2nd harmonic amplitude was strongly correlated with the curvature of anterior teeth and the length-to-width ratio in maxillary dentitions. By comparison of the constant term and amplitudes between different arch types, we did not observe significant differences in the constant term and the 1st amplitude of maxillary dentitions and in constant term and all amplitudes of mandibular dentitions. Nevertheless, the study revealed high contribution ratios of the 1st (in mandibular dentitions) and the 2nd (in maxillary dentitions) amplitudes essentially affecting the reproducibility of arch forms. The 1st amplitudes demonstrated a bow-like arrangement of all arch types, while the 2nd amplitudes adjusted the anterior-teeth curvature and in particular demonstrated the length-to-width ratio of maxillary dentitions. The 3rd and the 4th amplitudes were also determinants of the anterior-teeth curvature of maxillary dentitions. The 6th amplitude was necessary for reproduction, but showed no difference between varying mandibular dental arch types. Collectively, we conclude that the establishment of a Fourier series significantly reproduced maxillary but not mandibular dental arch forms.

  8. A new operative method for obtaining full-arch prostheses for immediate loading dental implants.

    Science.gov (United States)

    de Mello, Guilherme Paulo Scarpel; Mello, Elaine Duarte Artuso de; Corazza, Pedro Henrique

    2017-04-01

    Implant supported full-arch immediate prosthesis (also called the immediate Brånemark protocol) revolutionized dental clinical practice due to the aesthetic/functional benefits it offers to the patient. This work presents a simplified and efficient technique for implant supported full-arch immediate prosthesis fabrication. After diagnosing the necessity of the protocol, the implants were installed with a minimum torque of 35Ncm. For implant impression, the use of previously prepared castable cylinders (dispensing with impression posts), and a U-shaped acrylic (Mello technique) generated a cast without distortion. The Brånemark protocol was fabricated on this cast without the metal test specimen. The simplified technique proposed in this article for Brånemark protocol fabrication seemed to be effective. Copyright © 2016 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.

  9. The Morphology of the Primary Dental Arch of Chinese Children in Shijiazhuang-City Part-I: Research concerning the size of the primary tooth crown, primary dental arch and the condition of primary occlusion

    OpenAIRE

    岩崎, 浩; 林, 于昉; 宮沢, 裕夫; 宮崎, 顕道; 須澤, 弥生子; 張, 暁燕; 李, 憲起; 徐, 兵; 海, 懐麗; 張, 英懐; 廉, 雲敏; 牛, 夢勇; 王, 躍進; 蘇, 強; 小林, 茂夫

    1994-01-01

    The purpose of this study was to investigate the size of the primary tooth crowns, primary dental arches, standard values and frequency distribution of primary occlusion in Chinese children. With the cooperation of a kindergarten in Shijiazhuang-city, China, the dental plasters from 55 children (36 boys and 19 girls, age range from 3-6 years old) with normal primary occlusion were collected. Because of different growth rates of the children, these children were divided into two groups, one co...

  10. [Cross-sectional study of the evolution of the primary dentition: shape of dental arches, overjet and overbite].

    Science.gov (United States)

    de Castro, Liana Amado; Modesto, Adriana; Vianna, Roberto; Soviero, Vera Lígia Mendes

    2002-01-01

    The aim of this study was to evaluate the characteristics (shape of dental arches, overjet and overbite) of the primary dentition of 6- to 39-month-old children from four nurseries of Rio de Janeiro, Brazil, and to associate them to gender and dentition phase. It was observed that 68.6% of the children presented round upper arch, while 31.4% had triangular upper arch; 92% of the children presented U-shaped lower arch and 8% had square-shaped lower arch. Moderate overjet was observed in 38.3% of the children, and slight overjet, in 30.3%. Severe (26.6%) and negative (25.5%) overbites were the most prevalent modalities of that condition. There was no association between gender and the studied characteristics. There was statistically significant association between the dentition phase and the shape of the arch, overjet and overbite (p < 0.001, chi-square test). It was possible to observe, in the present study, that early signs of malocclusions appeared when first primary molars erupted, as the posterior vertical dimension of occlusion increased. It was, thus, verified that early signs of malocclusions appear as the primary dentition develops. It is very important that the first dental visit occur during the first year of age, since it allows the pediatric dentist to prevent or carry out an early diagnosis of malocclusions in the primary dentition.

  11. Estudo do relacionamento ântero-posterior entre os arcos dentários decíduos, de crianças nipo-brasileiras, dos dois aos seis anos de idade Study of the anteroposterior relationship between deciduous dental arches of Japanese-Brazilian children, from 2 to 6 years of age

    Directory of Open Access Journals (Sweden)

    Dirce Yamada Kataoka

    2006-10-01

    Full Text Available OBJETIVO: verificar as prevalências dos diferentes tipos de relacionamentos ântero-posteriores entre os arcos dentários decíduos, bem como o possível dimorfismo sexual, em crianças nipo-brasileiras na faixa etária dos dois aos seis anos de idade. METODOLOGIA: foram avaliadas por inspeção visual 310 crianças nipo-brasileiras, matriculadas em 19 escolas do estado de São Paulo, sendo 154 do gênero masculino e 156 do feminino. Os resultados foram submetidos ao teste do qui-quadrado e revelaram ausência de dimorfismo sexual para a maioria dos relacionamentos analisados, permitindo apresentar os resultados conjuntamente para ambos os gêneros. RESULTADOS: as prevalências dos relacionamentos entre os segundos molares decíduos foram: 47,4% para o degrau mesial, 41,3% para o plano terminal reto, 5,5% para o degrau distal e 5,8% para os casos com assimetrias. Para os relacionamentos entre os caninos decíduos, conforme Foster e Hamilton, constataram-se prevalências de 77,4% para a Classe 1, 6,8% para a Classe 2, 6,8% para a Classe 3 e 9% para as relações assimétricas. Apenas a Classe 2 apresentou dimorfismo sexual, sendo de 3,9% para o feminino e de 9,7% para o masculino. Quanto à sobressaliência verificaram-se prevalências de 71,3% para a normal, 14,2% para a aumentada, 7,4% para a mordida cruzada anterior e 7,1% para a mordida topo-a-topo. RESULTADOS: concluiu-se que a maioria das crianças nipo-brasileiras avaliadas neste estudo, apresentaram um relacionamento ântero-posterior normal entre os arcos decíduos, merecendo atenção uma ligeira tendência para o desenvolvimento da Classe 3.AIM: the purpose of this cross-sectional study was to verify the prevalences of different types of anteroposterior relationships between deciduous dental arches and its possible sexual dimorphism, in Japanese-Brazilian children from 2 to 6 years of age. METHODS: a total of 310 Japanese-Brazilian children from 19 schools in São Paulo, Brazil

  12. A 40 years follow-up of dental arch dimensions and incisor irregularity in adults.

    Science.gov (United States)

    Tsiopas, Nikolaos; Nilner, Maria; Bondemark, Lars; Bjerklin, Krister

    2013-04-01

    Dentoalveolar changes in adulthood have not been extensively documented. Such changes may have important implications for the long-term stability of orthodontic treatment. To analyse occlusal and dentoalveolar changes in adults from the age of 20 years to the age of 60 years. The material comprised 18 Swedish dentists, 16 men and 2 women, with no missing teeth and no prosthodontic or orthodontic treatment. Measurements were recorded on study casts made between 1949 and 1989 at the Department of Stomatognathic Physiology at the Faculty of Odontology in Malmö, thus documenting changes over an average period of 38.4 years. Malocclusion traits, overbite, overjet, dental arch length and width, and Little's irregularity index were registered. There was a significant increase in Little's irregularity index in the mandible (1.0 mm, P overjet remained unchanged during the observation period. The results confirm that dentoalveolar changes occur as a continuous process throughout adult life. The findings of potential clinical importance are decreases in arch length and depth, resulting in a decrease in intercanine width and an increase in anterior crowding. In clinical orthodontic practice, these findings have important implications for treatment planning and long-term stability after orthodontic treatment.

  13. Dental Arch Form Analysis in Gujarati Males and Females having Normal Occlusion

    Directory of Open Access Journals (Sweden)

    Vishnu Jagdishbhai Patel

    2012-01-01

    Results: As moving from anterior to posterior, both the arches diverge proportionally, except in second molar area where slight convergence toward midline was noted. Females had proportionally narrower arch dimensions than those for males. Five arch forms were determined according to relative deviations of various ratio combinations, and all subjects were classified for mandibular arch form by nonhierarchical stepwise method.

  14. 三维数字化牙模的牙弓线探测%Dental Arch Detection of 3D Dental Model

    Institute of Scientific and Technical Information of China (English)

    袁天然; 廖文和; 戴宁; 崔海华; 王长伟; 俞青

    2008-01-01

    提出了一种在三维数字化牙颌模型上直接探测牙弓线的方法.首先,根据给定的顶点法向和咬合面的夹角阈值过滤出初始特征点,并拟和得到初始牙弓线;其次,对初始特征点集进行等分并找出对应的局部最高顶点,对局部最高顶点进行拟和得到最终的牙弓线.通过对多副牙颌模型的实验表明,所提方法稳定、有效.%A robust detection method for dental arch directly applied on 3D dental model was proposed which could be easily acquired through intra or extra oral measurement methods. Firstly, the initial dental arch was obtained through fitting the initial feature points filtered out according to the given threshold of the angle between the normal of the model point and the occlusal plane. Then the set of the initial feature points was divided into subsets using planes perpendicular to the initial dental arch with equal arch length between each two adjacent planes. The local peak point was found out for each subset according to the distance value between the point of the corresponding subset and the occlusal plane, and the curve fitting to the local peak points was also the final dental arch. The method was tested on models with various types of malocclusions and is proved to be robust and accurate.

  15. Three-dimensional digital evaluation of dental arches in infants with cleft lip and/or palate.

    Science.gov (United States)

    Fernandes, Viviane Mendes; Jorge, Paula Karine; Carrara, Cleide Felício Carvalho; Gomide, Márcia Ribeiro; Machado, Maria Aparecida Andrade Moreira; Oliveira, Thais Marchini

    2015-01-01

    The aim of this study was to measure and compare the dimensions of the dental arches on three-dimensional digital study models in children with and without cleft lip and palate before the primary surgery. The sample consisted of 223 digital models of children aged 3-9 months, divided into 5 groups: without craniofacial deformities, unilateral and bilateral incomplete cleft lip and alveolus, unilateral and bilateral complete cleft lip and alveolus, unilateral cleft lip and palate, and bilateral cleft lip and palate. Dental casts of the maxillary dental arches of the children were used. The dental casts underwent a process of scanning through 3D scanner and the measurements used for the correlation among groups were made on the scanned images. Statistical analysis was performed by t test and ANOVA followed by Tukey test. The results showed that the intercanine distance and anterior cleft width was wider in children with unilateral cleft lip and palate. The intertuberosity distances and posterior cleft width was wider in children with bilateral cleft lip and palate among the groups. Children with cleft lip and palate before the primary surgery had wider maxillary arch dimensions than the children without cleft lip and palate.

  16. Effects of tongue volume reduction on craniofacial growth: A longitudinal study on orofacial skeletons and dental arches.

    Science.gov (United States)

    Liu, Zi-Jun; Shcherbatyy, Volodymyr; Gu, Gaoman; Perkins, Jonathan A

    2008-10-01

    The interaction between tongue size/volume and craniofacial skeletal growth is essential for understanding the mechanism of specific types of malocclusion and objectively measuring outcomes of various surgical and/or orthodontic treatments. Currently available information on this interaction is limited. This study was designed to examine how tongue body volume reduction affects craniofacial skeleton and dental arch formation during the rapid growth period in five 12-week-old Yucatan minipig sibling pairs. One of each pair received a standardized reduction glossectomy to reduce tongue volume by 15-17% (reduction group), and the other had the reduction glossectomy incisions without tissue removal (sham group). Before surgery, five stainless steel screws were implanted into standardized craniofacial skeletal locations. A series of cephalograms, lateral and axial, were obtained longitudinally at 1 week preoperative, and 2 and 4 weeks postoperative. These images were traced using superimposition, and linear and angular variables were measured digitally. Upon euthanasia, direct osteometric measurements were obtained from harvested skulls. Five en-bloc bone pieces were further cut for bone mineral examination by dual photon/energy X-ray absorptiometry (DEXA). The results indicate that: (1) while daily food consumption and weekly body weight were not significantly affected, tongue volume reduction showed an overall negative effect on the linear expansion of craniofacial skeletons; (2) premaxilla and mandibular symphysis lengths, and anterior dental arch width were significantly less in reduction than sham animals at 2 and/or 4 weeks after the surgery; (3) both premaxilla/maxilla and mandible bone mineral density and content were lower in reduction than sham animals, significantly lower in anterior mandible; (4) craniofacial skeletal and dental arch size were significantly smaller in reduction than sham animals, being most significant in the mandibular anterior length and

  17. The randomized shortened dental arch study (RaSDA: design and protocol

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    Kern Matthias

    2010-02-01

    Full Text Available Abstract Background Various treatment options for the prosthetic treatment of jaws where all molars are lost are under discussion. Besides the placement of implants, two main treatment types can be distinguished: replacement of the missing molars with removable dental prostheses and non-replacement of the molars, i.e. preservation of the shortened dental arch. Evidence is lacking regarding the long-term outcome and the clinical performance of these approaches. High treatment costs and the long time required for the treatment impede respective clinical trials. Methods/design This 14-center randomized controlled investigator-initiated trial is ongoing. Last patient out will be in 2010. Patients over 35 years of age with all molars missing in one jaw and with at least both canines and one premolar left on each side were eligible. One group received a treatment with removable dental prostheses for molar replacement (treatment A. The other group received a treatment limited to the replacement of all missing anterior and premolar teeth using fixed bridges (treatment B. A pilot trial with 32 patients was carried out. Two hundred and fifteen patients were enrolled in the main trial where 109 patients were randomized for treatment A and 106 for treatment B. The primary outcome measure is further tooth loss during the 5-year follow-up. The secondary outcome measures encompassed clinical, technical and subjective variables. The study is funded by the Deutsche Forschungsgemeinschaft (German Research Foundation, DFG WA 831/2-1, 2-2, 2-3, 2-4, 2-5. Discussion The particular value of this trial is the adaptation of common design components to the very specific features of complex dental prosthetic treatments. The pilot trial proved to be indispensable because it led to a number of adjustments in the study protocol that considerably improved the practicability. The expected results are of high clinical relevance and will show the efficacy of two common

  18. 牙弓曲线发生器的运动规划与仿真%Motion Planning and Simulation of Dental Arch Generator

    Institute of Scientific and Technical Information of China (English)

    姜金刚; 张永德

    2013-01-01

    针对牙弓曲线发生器需要协调控制的特点,对牙弓曲线发生器的运动规划进行了研究.基于牙弓曲线幂函数模型构建了牙弓曲线发生器,并进行了运动分析,基于弧长不变理论进行了牙弓曲线发生器控制点运动计算;提出基于牙弓参数等增量法实现了牙弓曲线发生器的运动规划,仿真结果表明:牙弓参数等增量规划法在牙弓曲线发生器运动过程中von mises应力最小,牙弓曲线发生器运动实际轨迹与仿真、理论轨迹近似吻合,结果证实了采用牙弓参数等增量法实现牙弓曲线发生器运动规划的可行性.%Aiming to the characteristics of coordinated control for dental arch generator, motion planning of dental arch generator is studied. Based on power function model of dental arch, dental arch generator is established. Control point positions of dental arch generator are calculated by the arc length constant theory. Dental arch parameter equal increment method is proposed to realize motion planning of dental arch generator. The results show that the maximum von mises hot spots of method 3 for the dental arch generator is small compared to other methods. The experimental motion trajectory of the dental arch generator is approximately in agreement with the simulation and theoretical motion trajectory. The results prove that it is feasible to realize motion planning of dental arch generator using the dental arch parameter equal increment method.

  19. Dental arch Transversal characteristics in boys and girls with orthognathic bite: head shape and face type dependence

    Directory of Open Access Journals (Sweden)

    Gunas Іgor

    2015-03-01

    Full Text Available In this work, we describe the boundary percentile scope values of transversal characteristics of the dental arch of boys and girls of Podillia, with diagnosed orthognathic bite. The study group consists of individuals with different forms of head and face. Our findings are that, in girls, unlike boys, set differences exist in the transversal dimensions of the upper and lower jaw, both in the distribution of the shape of the head, and the type of face. In boys with different head shape, larger values of transversal size of dental arch are evidenced when contrasted with the corresponding groups of girls, regarding the maxilla in 46.7% of all cases and the mandible in 22.2% of all cases, as well as with different types of faces in 66.7% of cases regarding the maxilla and 55.6% in the mandible.

  20. Masticatory efficiency of shortened dental arch subjects with removable partial denture: A comparative study.

    Science.gov (United States)

    Omo, J O; Sede, M A; Esan, T A

    2017-04-01

    The objective of this study was to compare the masticatory efficiency in subjects with shortened dental arch (SDA) before and after restoration with removable partial denture (RPD). This was a prospective study carried out on 36 consecutive patients. The subjects were asked to chew 5 g of a measured portion of fresh raw carrot for 20 specified numbers of strokes. The raw carrot was recovered into a cup and strained through a standard mesh sieve of 5 mm by 1 mm, it was air dried for 30 min and weighed with FEM digital series weighing scale. The masticatory performance ratio was then determined. The age range of the subjects was 34-64 years with the mean age being 52.2 ± 8.2 years. The difference between the total masticatory performance score at the post- and pre-treatment phases was statistically significant (P = 0.001). The improvement in masticatory performance was marked among the younger age groups (P = 0.001), unilateral free end saddle subjects (P = 0.001), and among the male gender (P < 0.05). Masticatory performance improved with the provision of RPD. However, the improvement was marked among the younger age groups, unilateral free end saddle subjects, and the male gender; thereby supporting the need for RPDs in patients with SDA.

  1. Incisor and molar overjet, arch contraction, and molar relationship in the mixed dentition in repaired complete unilateral cleft lip and palate: A qualitative and quantitative appraisal.

    Science.gov (United States)

    Disthaporn, Suteeta; Suri, Sunjay; Ross, Bruce; Tompson, Bryan; Baena, Diogenes; Fisher, David; Lou, Wendy

    2017-07-01

    To compare the mixed dentition incisor and molar overjet, severity of contraction of the dental arch, and the sagittal molar relationship on the cleft side vs the noncleft side in children with repaired complete unilateral cleft of the lip and palate (UCLP). Orthodontic records taken prior to orthodontic preparation for alveolar bone grafting were screened to select study casts from patients with nonsyndromic repaired complete UCLP who did not have mandibular skeletal or dental asymmetry. The study sample comprised dental casts from 74 children aged 8.9 ± 1 years. Standardized digital photographs were acquired at 1:1 magnification. A coordinate system was developed using digital image-processing software (Photoshop CS4 and Adobe Illustrator). Incisor and molar overjet, Angle's classification, and arch contraction were recorded. Descriptive statistics, paired t-tests, and kappa statistics were used to compare the cleft and noncleft sides. A negative overjet of -1 to -5 mm was often present at the incisors, with greater frequency and magnitude on the cleft side. Class II molar relation was more frequent on the cleft side (61.1%) than on the noncleft side (47.2%). Significantly greater contraction of the cleft side deciduous canine and deciduous first molar was noted, while the difference was very minor at the first permanent molar. Cleft side maxillary arch contraction was most severe in the deciduous canine and first deciduous molar region and progressively less severe in the posterior region of the arch. A greater frequency and severity of negative overjet and Class II molar relationship was seen on the cleft side.

  2. Clinical Evaluation of Different Pre-impression Preparation Procedures of Dental Arch

    Science.gov (United States)

    Arora, Nitin; Arora, Monika; Gupta, Naveen; Agarwal, Manisha; Verma, Rohit; Rathod, Pankaj

    2015-01-01

    Background: Bubbles and voids on the occlusal surface impede the actual intercuspation and pre-impression preparation aims to reduce the incidence of air bubbles and voids as well as influences the quality of occlusal reproduction and actual clinical intercuspation in the articulator. The study was undertaken to determine the influence of different pre-impression preparation procedures of antagonistic dental arch on the quality of the occlusal reproduction of the teeth in irreversible hydrocolloid impressions and to determine most reliable pre-impression preparation method to reduce the incidence of air bubbles. Materials and Methods: A total of 20 subjects were selected having full complement of mandibular teeth from second molar to second molar with well demarcated cusp height. 200 impressions were made with irreversible hydrocolloid material. The impressions were divided into five groups of 40 impressions each and each group had one specific type of pre-impression preparation. All the impressions were poured in die stone. A stereomicroscope with graduated eyepiece was used to count the number of bubbles on the occlusal surface of premolars and molars. The mean and standard deviations were calculated for each group. Mann–Whitney U-test was applied to find the significant difference between different groups. Results: Least bubbles were found in the group in which oral cavity was dried by saliva ejector and fluid hydrocolloid was finger painted onto the occlusal surfaces immediately before the placement of impression tray in the mouth. Conclusion: It was found that finger painting the tooth surfaces with fluid hydrocolloid immediately before the placement of loaded impression tray in the mouth was the most reliable method. The oral cavity can be cleared more easily of excess saliva by vacuum suction rather than by use of an astringent solution. PMID:26229376

  3. Loss of space and dental arch length after the loss of the lower first primary molar: a longitudinal study.

    Science.gov (United States)

    Cuoghi, O A; Bertoz, F A; de Mendonca, M R; Santos, E C

    1998-01-01

    The premature loss of primary teeth may harm the normal occlusal development, although there are debates relating to the necessity of using space maintainer appliances. The aim of the study is to evaluate the changes in the dental arch perimeter and the space reduction after the premature loss of the lower first primary molar in the mixed dentition stage. The sample consists of 4 lower arch plaster models of 31 patients, within the period of pre-extraction, 6, 12 and 18 months after the lower first primary molar extraction. A reduction of space was of noted with the cuspid dislocation and the permanent incisors moving toward the space of the extraction site. It was concluded that the lower first molar primary premature loss, during the mixed dentition, implicates an immediate placement of a space maintainer.

  4. Influence of third molar space on angulation and dental arch crowding.

    Science.gov (United States)

    Hasegawa, Yuh; Terada, Kazuto; Kageyama, Ikuo; Tsuchimochi, Takashi; Ishikawa, Fujiro; Nakahara, Sen

    2013-01-01

    The influence of the third molars on mandibular incisor crowding has been extensively studied but remains controversial. The purpose of this study was to ascertain whether, in Mongolian subjects, the lower third molar can affect anterior crowding and/or the inclination of teeth in the lower lateral segments. Panoramic radiographs, 45° oblique cephalograms, and dental casts were taken from Mongolian subjects (age range 18.3-24.1 years, mean 21.0 years) exhibiting impaction of all four third molars and an Angle Class I molar relationship. The Ganss ratio was calculated using panoramic radiographs, whereas the gonial angle and angulation of lower canines, premolars and molars were measured using 45° oblique cephalograms. Little's index of irregularity was calculated using dental casts. Significant relationships between the angulation of the third and second molars and between the first molars and second premolars were found. Conversely, there was no significant correlation between the angulation of third molars, first premolars and canines. The Ganss ratio calculations showed that the lower first and second molars and the second premolars inclined mesially if there was insufficient space for the lower third molars. However, there was no significant correlation between Little's index of irregularity and third molar angulation. Furthermore, although the third molar influences the lateral segments, no obvious relationship between the third molar and anterior crowding was observed. Therefore, the angulation of the third molar appears not to cause anterior crowding.

  5. Effects of different types of palatal lateral excisions on growth and development of maxilla and dental arch

    Institute of Scientific and Technical Information of China (English)

    Jun WU; Qian ZHENG; Bing SHI; Tian MENG; Yan WANG; Sheng LI; Lishu LIAO

    2008-01-01

    Obiective:This study aimed to explore the effects of different types of palatal lateral excisions on the growth and deveiopment of the maxilla and dental arch.and to investigate the underlying mechanisms.Methods:A total of 1123-week-old Sprague-Dawley(SD)male rats were randomly divided into a control and 3 experimental groups:the mucoperiosteal denudation group,the mucosal flap excision group,and the periosteum excision group.In the experimental groups,bilateral mucoperiosteal,mucosal flap and periosteum were excised respectively in the lateral one half of the palate.Four rats in each group were randomly chosen for sacrifice every two weeks.The maxilla was dissected following the excision.The widths of the maxilla and dental arch were measured and the histological phenomena were investigated at different phases.At the same time.12 animals in each group were sequentially injected with calcein every two weeks.Three animals in each group,whose fluorescent labeling was used,were sacrificed for investigating bone formation at Week 8 following injection.Results:(1)Each experimental group presented the constriction of the maxilla and dental arch.The upper first molars in the experimental groups inclined medially.The mucoperiosteal denudation group showed the largest degree of effect followed by the periosteum excision group.The indices of the mucosal flap excision group,which retained the structures of the periosteum layer,had the most approximate values to the control group;(2)Different histological changes among the experimental groups were detected.The fibers penetrated into the palatal bone asSharpey's fibers in the mucoperiosteal denudation group.The pattern of bone deposition was the bundle type.Sharpey's fiberswerenotfoundinthemucosaI flapandperiosteum excisiongroups andthedepositions ofpalatalbonewerethelamellartypeasthose in the control group;(3)The rates ofbone deposition in the experimental groups decreased compared with the control group.The rates in different

  6. Correlação entre padrão facial e relação sagital entre os arcos dentários no estágio de dentadura decídua: considerações epidemiológicas Correlation between facial pattern and sagittal relationship between dental arches in deciduous dentition: epidemiological considerations

    Directory of Open Access Journals (Sweden)

    Omar Gabriel da Silva Filho

    2008-02-01

    Full Text Available OBJETIVO: A inter-relação oclusão e morfologia facial é fundamental para o diagnóstico e planejamento em ortodontia, bem como para determinação do prognóstico de tratamento. De um modo geral, a relação sagital entre os arcos dentários (Classe tende a refletir o comportamento sagital do esqueleto facial (Padrão. O presente trabalho avalia a correlação entre as características morfológicas sagitais da face (Padrão e da oclusão (Classe no estágio de dentadura decídua. METODOLOGIA: A amostra foi composta por 2009 crianças, entre 03 e 06 anos de idade, no período de dentadura decídua completa, de 20 pré-escolas do Município de Bauru - SP. Os resultados demonstraram uma correlação estreita entre o Padrão facial e a Classe. No Padrão I predominou a Classe I (62,99%, seguida pela Classe II (35,82% e Classe III (1,18%. No Padrão II, a Classe II foi predominante (81,35% acompanhada de uma incidência baixa de Classe I (18,64%. No Padrão III, a Classe III estava presente em 50% das crianças, seguida pela Classe I, em 48,64%, e Classe II, em 1,35%. RESULTADOS: A expectativa se comprovou. Há uma tendência da Classe acompanhar o Padrão, desde o estágio de dentadura decídua. Isso foi mais explícito no Padrão II. Os resultados também esclarecem que a oclusão guarda alguma independência em relação ao Padrão. CONCLUSÃO: A maior heterogeneidade na distribuição das Classes ficou para os Padrões I e III. No Padrão II, as Classes se comportaram de forma mais homogênea, com mais de 80% das crianças exibindo Classe II.The interrelationship between occlusion and facial morphology is fundamental for diagnosis and planning in Orthodontics. In general, the sagittal relationship between dental arches (Class tends to reflect the sagittal position of facial skeleton (Pattern. This current paper assesses the correlation between sagittal facial morphological characteristics (Pattern and occlusion (Class in deciduous dentition

  7. Three-dimensional visualisation and analysis of post-operative changes in the size and shape of the dental arch and palate.

    Science.gov (United States)

    Trefný, P; Tauferová, E; Bálková, S

    2005-01-01

    In craniofacial surgery and orthodontics, three-dimensional computer models of the dental arch and palate have recently entered usage in diagnosis assessment, treatment planning, case presentations and evaluation of treatment progress and outcome. In this contribution, we show how effective visualisation and evaluation of changes in the size and shape of the dental arch and palate in a given patient can be performed using superimposition of two or more 3D computer models that record the condition before and after treatment. We also present a method of three-dimensional measurement of the dental arch and palate suitable for evaluation of treatment results within retrospective and prospective studies in larger samples of subjects.

  8. Differences in functional outcomes for adult patients with prosthodontically-treated and -untreated shortened dental arches: a systematic review.

    Directory of Open Access Journals (Sweden)

    Saadika Khan

    Full Text Available This review examined differences in functional outcomes and patient satisfaction when shortened dental arches are left untreated compared to their restoration to complete arch lengths with different prosthodontic interventions.A protocol was developed according to the criteria for a systematic review. All relevant databases were searched to identify appropriate clinical trials regardless of language or publication status. Predetermined eligibility criteria were applied, trial quality assessed and data extracted for each study. Relevant outcomes assessed were: functioning ability, patient satisfaction and harmful effects on oral structures.Searches yielded 101 articles: 81 from electronic databases and 20 from reference lists of retrieved articles (PEARLing searches. Sixty-nine citations were assessed for eligibility after removing 32 duplicate records. After reading titles and abstracts, a total of 41 records were excluded and the full-texts of the remaining 28 records were read. Only 21 records were included for the SR because 7 records were excluded after reading the full-text reports. These 21 records report the outcomes of four randomized controlled trials (RCTs and one non-randomized clinical trial (CT which were pre-specified and used for this review. No on-going studies were found and no eligible studies were excluded for failure to report the reviewer's pre-specified outcomes. Outcomes were reported in the retrieved 21 articles. A narrative explanation of the pre-specified outcomes is reported for the 3 comparison groups (which were based on the different interventions used for the individual clinical trials. The shortened dental arch as a treatment option is encouraging in terms of functioning, patient satisfaction and cost-effectiveness. By using only high quality studies it was expected that the results would be more reliable when making conclusions and recommendations, but some of the included studies had to be downgraded due to

  9. Comparison of dental arch dimensions in models of preschool children with cleft lip/palate repaired by means of surgery alone versus controls.

    Science.gov (United States)

    Burhan, Ahmad S; Nawaya, Fehmieh R

    2016-09-01

    Cleft lip and palate (CLP) anomaly is one of the most prevalent congenital defects causing disturbances of dental arch dimensions. This study aimed at investigating differences in these dimensions between preschool children with cleft lip/palate and a matched control group representing healthy individuals with normal occlusion (NO). The sample of this cross-sectional analytical study consisted of 108 plaster models of children aged from 4 to 5.5 years. They were divided into five groups: the cleft lip group, the cleft palate (CP) group, the unilateral cleft lip and palate group, the bilateral cleft lip and palate group, and the NO group. The NO group was used as a control group. All cleft-affected children were treated only with surgery. Dental arch length and widths were measured. The dental arch dimensions of the cleft lip group were nearly similar to those in the controls. Moreover, the mandibular transverse widths of the CP group were close to those in the controls. However, the mandibular arch length and all maxillary dimensions of the CP group were smaller than those in the controls. In the unilateral cleft lip and palate group, the arch lengths in both jaws and the maxillary transverse widths were smaller than those in the controls, whereas the mandibular transverse widths were similar to those in the controls. In the bilateral cleft lip and palate group, the arch lengths in both jaws were close to those in the controls, but both arches were narrower than those in the controls. The various types of CLP were found to be associated with differences in most maxillary and some mandibular arch dimensions. These data can be used for cleft patient counseling and treatment planning.

  10. Clinical effects of canine movement by segmented dental arches%节段正轴辅弓远移尖牙的疗效观察

    Institute of Scientific and Technical Information of China (English)

    张昀; 李传生

    2011-01-01

    AIM: To observe the clinical effects of canine distal removement by segmented dental arches.METHODS: Twelve cases (24 canines) of severely crowded dentation patients were chosen. After extraction of the first premolars, specially bended segmented dental arches were applied to move the canines distally. Overjet and over-bite, interdigitation for posterial molars as well as canines and anchorage molars moving situations were observed. RESULTS:After 5 months, canines were moved 5. 2mm ( 1. 04mm/per month) distally and 3. 8mm (0. 76mm/per month) occlusally by segmented dental arches. MBT straight wire appliance was used for the later stage treatment. After MBT treatment, normal jet and normal bite were achieved. Canines and first molars reached interdigitation relationship. There was no shift in anchorage molars. CONCLUSION: Early stage usage of special segmented dental arches to move canines distally and later stage usage of MBT straight wire appliance are effective on the orthodontic treatment of severely crowded dentition.%目的:探讨重度拥挤伴尖牙近中唇移过低位病人拔除4个第一前磨牙后,早期用节段正轴辅弓远中、黯向移动尖牙,结合直丝弓矫治器的矫治疗效,为临床应用提供依据.方法:对12例(共24个尖牙)前牙拥挤和伴有尖牙近中唇移过低位的病例,在拔除第一前磨牙1周后应用自行弯制的节段正轴辅弓牵引尖牙远中、向移动,同时观察尖牙、磨牙的移动情况和临床效果.结果:经过早期使用节段正轴辅弓,尖牙5个月平均向远中移动5.2mm(速率1.04mm/月),骀向移动5个月平均3.8mm(速率0.76mm/月).通过后期的MWT.直丝弓矫治器,12例病人覆、覆盖正常,尖牙和第一磨牙达到理想的中性咬合关系,上下颌牙齿尖窝交错,咬合关系良好,尖牙轴倾度正常,支抗磨牙无明显移动.结论:早期应用节段正轴辅弓和后期直丝弓矫治器,进行拥挤伴尖牙近中唇移过低位的拔牙矫治,不

  11. Relationship between needle phobia and dental anxiety

    NARCIS (Netherlands)

    Majstorovic, M.; Veerkamp, J.S.J.

    2004-01-01

    Purpose: This cross-sectional study aimed to explain the nature of needle phobia and its relationship in dental phobic children with evidence on age-related differences. Methods: The study used 2,865 patients (52% boys, 48% girls), 4 to 11 years old (mean=7.18 years). The patient sample included ran

  12. Influence of scanning and reconstruction parameters on quality of three-dimensional surface models of the dental arches from cone beam computed tomography

    NARCIS (Netherlands)

    Hassan, B.; Souza, P.C.; Jacobs, R.; Berti, S.D.; van der Stelt, P.

    2010-01-01

    The study aim is to investigate the influence of scan field, mouth opening, voxel size, and segmentation threshold selections on the quality of the three-dimensional (3D) surface models of the dental arches from cone beam computed tomography (CBCT). 3D models of 25 patients scanned with one image in

  13. Dental arch width, overbite, and overjet in a Finnish population with normal occlusion between the ages of 7 and 32 years.

    Science.gov (United States)

    Heikinheimo, Kaisa; Nyström, Marjatta; Heikinheimo, Tuomas; Pirttiniemi, Pertti; Pirinen, Sinikka

    2012-08-01

    The aims of the present study were to provide data on growth changes in the dental arches from age 7 to 32 in Finns with untreated normal Angle Class I occlusions. The material consisted of 33 series of dental casts of 18 women and 15 men. The subjects had been examined and study models taken at the ages of 7, 10, 12, 15, and 32. Dental arch width, overbite, and overjet were measured. Our longitudinal findings show that both the dental arches of young adults are slightly narrowed from adolescence to 32 years of age. All increases in width dimensions took place before 15 years of age. The means of the changes were mostly small, in the order of 0.5 to a few millimetres. Variability in age changes was considerable. In both genders, each variable increased in some subjects and decreased in others during every age interval. Differences between growth changes in the mesial, distal, and gingival intermolar widths indicate that both the maxillary and the mandibular first molars rotate mesiolingually and that the maxillary first molars also become more upright during late occlusal development. We expect the present findings of the changes occurring in the arch dimensions of subjects with untreated normal occlusions to help clinicians in following up occlusal development, choosing an optimal treatment time, and making orthodontic treatment and retention plans. However, because of the wide variability, accurate prediction of future development cannot be made on the individual level.

  14. Evaluation of dental arch changes in patients following the use of Y shape appliance expansion

    Directory of Open Access Journals (Sweden)

    Ahmad Akhondi MS

    2001-09-01

    Full Text Available The purpose of this study was to evaluate Y shape appliance for expansion on maxillary arch of patients in their mixed dentition age. Eight patients, 6 girls and 2 boys, with maxillary constriction, retrusion of maxillary anteriors, and space deficiency of upper canine were treated by Y-plate expansion. For each patient 8 parameters on upper cast and 7 parameters on lower cast were measured. Statistical analysis was conducted by calculating the mean, standard deviation and p-value, of parameters. Since these parameters change during natural growth, the results were compared to normal growth changes of similar patients group form another study as control. Results showed significant increase in maxillary and mandibular cervical and coronal intercanine and intermolar width (P<0.005. The results also showed significant increase in maxillary arch length and perimeter.

  15. Relationship between caries and dental plaque composition.

    Science.gov (United States)

    Bayrak, Sule; Okte, Zeynep; Fidanci, Ulvi Reha

    2011-02-01

    To evaluate the relationship between dental caries and the biochemical composition of dental plaque and to determine the effect of a 10% sucrose solution on the biochemical structure of dental plaque in children. 60 children grouped according to caries status took part in this study [Caries-free (CF), DMFS=0, df-s = 0; Caries-positive (CP), DMFS > or =10, df-s > or =10]. Dental plaque samples were collected before (baseline) and at 3 and 30 minutes after a 1-minute rinse with 10% sucrose. Fluoride (F), calcium (Ca), and inorganic phosphorus (Pi) levels were determined using ion chromatography, and insoluble polysaccharide (IEPS) concentrations were determined using colorimetric analysis. Although the mean baseline Ca and Pi levels in plaque were higher in the CF group than in the CP group, these differences were not statistically significant. Baseline IEPS levels were significantly higher in the CP group than in the CF group. Following exposure to sucrose, plaque F, Ca and Pi concentrations decreased significantly in both groups. However, insoluble polysaccharide concentrations increased significantly in the CF group only.

  16. The consumer-provider relationship in the dental industry.

    Science.gov (United States)

    Griffith, Andrew S; Abratt, Russell

    2013-01-01

    This article explains how a consumer's level of trust and commitment to his or her dental service provider factors into the relationship between the consumer and the dental professional. Very little research has been done that describes the complexity of this relationship. This article documents the complexity of and influences on that relationship by providing an interaction model of this relationship.

  17. Rapid maxillary expansion treatment could produce long-term dental arch changes

    NARCIS (Netherlands)

    Ren, Yijin

    2005-01-01

    : Data Sources: Medline, Medline In-Process, LILACS (Latin American and Caribbean Health Sciences Literature), PUBMED, Embase, Web of Science and the Cochrane Library were searched. Search terms were rapid palatal expansion or rapid maxillary expansion (RME) and tooth or dental changes. Reference li

  18. Comparison of two treatment protocols in children with unilateral complete cleft lip and palate: Tridimensional evaluation of the maxillary dental arch.

    Science.gov (United States)

    Jorge, Paula Karine; Gnoinski, Wanda; Vaz Laskos, Karine; Felício Carvalho Carrara, Cleide; Gamba Garib, Daniela; Okada Ozawa, Terumi; Andrade Moreira Machado, Maria Aparecida; Pinelli Valarelli, Fabrício; Oliveira, Thais Marchini

    2016-09-01

    The aim of this study was to evaluate the dimensional alterations of the maxillary dental arches after lip repair in children with unilateral complete cleft lip and palate of two different protocols. The sample was composed of 94 digital models and divided in two groups: Group I - 23 children, (protocol 1) - with presurgical orthopedic intervention: Hotz plate; Group II - 24 children, (protocol 2) - without presurgical orthopedic intervention. The three dimensional images of the maxillary arch were obtained before lip repair (stage 1) and at approximately 1 year of age (stage 2). Interstages changes for each group were evaluated using dependent t test and Wilcoxon test, and in the intergroup were used independent t test, and Mann-Whitney test. The comparison of the dimensional alterations of dental arches between the two protocols exhibited differences: in the stage 1, the intercanine was smaller in Group II; in the stage 2, the anterior cleft width, the intercanine and the anteroposterior cleft were smaller in Group II. The results reported here suggest that the use of infant orthopedic plate as applied in protocol 1 may favor correct arch form establishment in infants with unilateral complete cleft lip and palate. Copyright © 2016. Published by Elsevier Ltd.

  19. A structural equation model to investigate the impact of missing occlusal units on objective masticatory function in patients with shortened dental arches.

    Science.gov (United States)

    Fueki, K; Yoshida, E; Igarashi, Y

    2011-11-01

    The aim of this study was to investigate the impact of missing occlusal units (MOUs) on objective masticatory function with respect to food comminuting and mixing ability. Sixty partially dentate patients (mean age, 64·1 years) with shortened dental arches participated in the study. Food comminuting ability was assessed using a masticatory performance test with peanuts as a test food. Food mixing ability was assessed using a mixing ability test with a two-coloured wax cube. Maximum bite force (MBF) was measured using a pressure-sensitive film as a mediator for food comminuting and mixing ability. A structural equation model was constructed based on a hypothesis that MOUs would be associated with reduced MBF and impairment of food comminuting and mixing ability. Structural equation modelling analysis found significant direct effects of MOU on median particle size and mixing ability index (MAI) (P dental arches.

  20. Lucy's flat feet: the relationship between the ankle and rearfoot arching in early hominins.

    Directory of Open Access Journals (Sweden)

    Jeremy M DeSilva

    Full Text Available BACKGROUND: In the Plio-Pleistocene, the hominin foot evolved from a grasping appendage to a stiff, propulsive lever. Central to this transition was the development of the longitudinal arch, a structure that helps store elastic energy and stiffen the foot during bipedal locomotion. Direct evidence for arch evolution, however, has been somewhat elusive given the failure of soft-tissue to fossilize. Paleoanthropologists have relied on footprints and bony correlates of arch development, though little consensus has emerged as to when the arch evolved. METHODOLOGY/PRINCIPAL FINDINGS: Here, we present evidence from radiographs of modern humans (n = 261 that the set of the distal tibia in the sagittal plane, henceforth referred to as the tibial arch angle, is related to rearfoot arching. Non-human primates have a posteriorly directed tibial arch angle, while most humans have an anteriorly directed tibial arch angle. Those humans with a posteriorly directed tibial arch angle (8% have significantly lower talocalcaneal and talar declination angles, both measures of an asymptomatic flatfoot. Application of these results to the hominin fossil record reveals that a well developed rearfoot arch had evolved in Australopithecus afarensis. However, as in humans today, Australopithecus populations exhibited individual variation in foot morphology and arch development, and "Lucy" (A.L. 288-1, a 3.18 Myr-old female Australopithecus, likely possessed asymptomatic flat feet. Additional distal tibiae from the Plio-Pleistocene show variation in tibial arch angles, including two early Homo tibiae that also have slightly posteriorly directed tibial arch angles. CONCLUSIONS/SIGNIFICANCE: This study finds that the rearfoot arch was present in the genus Australopithecus. However, the female Australopithecus afarensis "Lucy" has an ankle morphology consistent with non-pathological flat-footedness. This study suggests that, as in humans today, there was variation in arch

  1. The relationship of dental caries and dental fear in Malaysian adolescents: a latent variable approach

    Science.gov (United States)

    2014-01-01

    Background To investigate the role of geography (place of residence) as a moderator in the relationship between dental caries disease and treatment experience and dental fear in 16-year-olds living in Malaysia. Methods A multi-stage-stratified sampling method was employed. Five hundred and three, 16-year-olds from 6 government secondary schools participated in this study. The questionnaire examined participants’ demographic profile and assessed their dental fear using the Dental Fear Survey (DFS). The clinical examination consisted of the DMFT as the outcome measure of dental caries disease and treatment experience by a single examiner (ICC = 0.98). Structural equation modelling inspected the relationship between dental fear and dental caries disease and treatment experience. Results The mean DMFT was 2.76 (SD 3.25). The DT, MT and FT components were 0.64 (SD 1.25), 0.14 (SD 0.56) and 1.98 (SD 2.43) respectively. Rural compared with urban adolescents had significantly greater mean numbers of decayed and missing teeth. The mean DFS score was 40.8 (SD 12.4). Rural compared with urban adolescents had significantly higher mean scores for physical symptoms of dental fear. The correlation between dental fear (DFS) and dental caries disease and treatment experience (DMFT) was 0.29, p dental caries disease and treatment experience. The strength of the relationship between dental fear and dental caries disease and treatment experience varied in accordance with place of residence. Conclusion In conclusion a relationship between dental fear and dental caries disease and treatment experience was shown to exist in 16-year-old adolescents living in Malaysia. This study showed that the rural–urban dichotomy acted as a moderator upon this relationship. PMID:24621226

  2. 牙弓/牙槽骨弓的塑形矫治——基于牙弓形态发育不良的儿童错(拾)畸形诊断与阻断治疗%Dental alveolar bone and dental arch remodeling in children: orthodontic diagnosis and treatments based on individual child arch development

    Institute of Scientific and Technical Information of China (English)

    李小兵

    2016-01-01

    The etiology of malocclusions basically involves both congenital and environmental factors. Malocclusion is the result of the abnormal development of the orofacial complex (including tooth, dental alveolar bone, upper and lower jaws). Early orthodontic interceptive treatments involve the elimination of all congenital and environmental factors that contribute to the malformation of the orofacial complex, as well as interrupt the deviated development of the orofacial complex and the occlusion. Early orthodontic interceptive treatments mainly aim to use children's growth potential to correct abnormal develop-ments of occlusions and orthodontically treat malocclusions more efficiently. The early orthodontic interceptive treatments include correcting the child's bad oral habits, training the abnormal functioned para-oral muscles, maintaining the normal eruptions of succeeding permanent teeth, applying interceptive treatments to the mal-developed teeth, and employing functional orthopedic treatments for abnormal growths of the upper and lower jaws. In orthodontics, correcting mal-positioned teeth is called orthodontic treatment, while rectifying the abnormal relationships of the upper and lower jaws is called functional orthopedic treatment. However, no clear definition is available as regards to the early orthodontic interceptive treatment of malocclusions caused by the deviated development of the dental alveolar bone. This new theory of "early dental alveolar bone and dental arch remodeling technique" was proposed by Professor Li Xiaobing of the Department of Pediatric Dentistry, Faculty of Pediatric Dentistry and Orthodontics in West China Hospital of Stomatology through his clinical analyses and investigation of his early orthodontic interceptive treatments. He defined the early orthodontic corrections of abnormal growth of dental alveolar bone as "remodel". The "early dental alveolar bone and dental arch remodeling theory and technique" is proved useful in

  3. Dental arch changes from 22 to 43 years of age: are they different in individuals with high versus low mandibular plane angle?

    Science.gov (United States)

    Bondevik, Olav; Espeland, Lisen; Stenvik, Arild

    2015-08-01

    To investigate whether individuals with high and low mandibular plane angles, respectively, have different patterns of long-term dental arch changes in adulthood. The material comprised 16 low-angle (≤ 24.4 degree) and 10 high-angle individuals (≥38.7 degree). Mean age was 22.7 years when the first recordings were made (T1), and new recordings were made 10 (T2) and 20 (T3) years later. The individuals were orthodontically untreated except for three who had been out of retention for more than 5 years before T1. Lateral cephalograms and study casts were obtained on all three occasions. For the total observation period, the greatest mean changes were observed as a 1mm decrease of lower intercanine width and arch depths in both groups. Intermolar widths increased less than 0.5mm. Upper and lower crowding increased in the range of 0.5-0.7mm in the two groups. Only small changes occurred in overjet and overbite. Differences between groups were not significant except for lower anterior arch depth which decreased more in the low-angle group, and overjet which increased in the high- and decreased in the low-angle group. During both periods the changes were generally in the same direction. Changes in dental arch dimensions from third to fifth decade of life are small and generally similar in individuals with high versus low mandibular plane angles. The changes are for most variables in the same direction in the two periods examined. The only significant differences between the groups are the changes in lower arch depth and overjet. © The Author 2014. Published by Oxford University Press on behalf of the European Orthodontic Society. All rights reserved. For permissions, please email: journals.permissions@oup.com.

  4. Axial relationship between dental implants and teeth/implants: a radiographic study.

    Science.gov (United States)

    Machtei, Eli E; Oettinger-Barak, Orit; Horwitz, Jacob

    2014-08-01

    The relationship of dental implants with neighboring teeth will affect both occlusal relationship and distribution of forces; thus, the purpose of this study was to examine implants' axial relationship with adjacent and opposing teeth/implants. Data of dental implants patients was retrieved. Panoramic X rays were digitized. Computer-based software was used to measure the angular relationship between the implants and adjacent/opposing teeth and implants. Data was further sorted by the mode of placement and implants position. 50 patients (219 implants) were included. Mean angle to adjacent tooth/implant was 178.71° ± 9.18° (range 129.7°-206°). Implants were more parallel to adjacent teeth (180.99° ± 1.06°) than to adjacent implants (176.32° ± 0.54°; P = .0001). Mean angular relationship to opposite tooth was 167.88° ± 8.92° (range 137.7°-179.8°). Implants that were placed freehand or with positional guide had similar intra-arch relationship (178.22° and 178.81°, respectively) and similar inter-arch angulations (164.46° and 167.74°). Molars had greater deviation of the angular relationship (175.54°) compared to premolars (181.62°) and incisors (180.55°, P = .0001). Implants placed in the maxilla had smaller axial deviation compared to implants in the mandible (180.41° ± 0.64 vs 177.14° ± 1.02; P = .0081). Good axial relationship may be obtained in most implants placed by an experienced clinician, even when placed freehand. The mandibular posterior region is more prone to axial deviation and as such requires special attention.

  5. Relationship Between Children’s Dental Needs and Dental Care Utilization: United States, 1988–1994

    Science.gov (United States)

    Vargas, Clemencia M.; Ronzio, Cynthia R.

    2002-01-01

    Objectives. This study describes the relationship between dental needs and dental care utilization among children. Methods. Data from the third National Health and Nutrition Examination Survey (1988-1994) were used to analyze dental care needs and dental care utilization. Results. Younger children with perceived needs (needs perceived by the child or responsible adult) were more likely to be episodic users of dental care than children without perceived needs. Younger children with normative needs (defined by the presence of untreated caries diagnosed by a dentist) were less likely to be regular users. Older children with perceived or normative needs were more likely to be episodic users and less likely to have had a previous-year visit than children with no needs. Conclusions. Despite their presence, dental needs do not drive dental care use among children, and children’s dental care utilization is inadequate. PMID:12406814

  6. High arch

    Science.gov (United States)

    Pes cavus; High foot arch ... High foot arches are much less common than flat feet. They are more likely to be caused ... difficult to fit into shoes. People who have high arches most often need foot support. A high ...

  7. Form and size of the dental arches in a school population of Amazonian’s aborigines.

    Directory of Open Access Journals (Sweden)

    Sandra Rivera

    2009-11-01

    Full Text Available Objetivo: El propósito del presente estudio es determinar la forma de los arcos dentales, describir las diferencias en las dimensiones transversales y en profundidad de los arcos durante la dentición mixta, con el fin de conocer su incidencia en la disposición de la armonía oclusal en una población de escolares indígenas de Leticia, Amazonas, Colombia. Materiales y métodos: Se realizó un estudio descriptivo transversal donde se incluyeron 64 escolares, 32 niños y 32 niñas distribuidos en dos grupos: con dentición mixta temprana, 31 escolares y el grupo de dentición mixta tardía con 33 estudiantes entre 6 y 12 años. Las variables estudiadas fueron las medidas de los modelos de estudio. Resultados: El arco superior tuvo forma ovalada en 86% de la población y en 14% la forma fue cuadrada; para el arco inferior las formas fueron 75% ovaladas y 25% cuadradas. Casi todas las medidas transversales presentaron diferencias en ambos grupos, la distancia intercanina inferior se mantuvo constante. Las medidas en profundidad, anchura y longitud evidencian armonía en el desarrollo de los arcos en los niños amazónicos. Discusión: En este grupo étnico predominó el arco de forma ovalada, seguida de la forma cuadrada. Se encontraron diferencias para todas las medidas en profundidad del arco, principalmente en el sector anterior que sería el más susceptible a cambios por factores ambientales durante el período de la dentición mixta de transición. Conclusiones: La armonía oclusal de la población estudiada es el resultado de una forma de arco y cambios transversales y en profundidad fisiológicamente normales.

  8. Drug abuse. Its relationship to dental practice.

    Science.gov (United States)

    Aston, R

    1984-07-01

    Drug abuse appears destined to become an exacerbating cultural phenomenon despite intrinsic dangers to the abuser and accelerating costs to society. Dentists cannot afford to ignore the problem or its sequelae either in terms of their personal involvement or in terms of the clinical implications of such a practice for their patients. Abuse of agents, such as opioids and amphetamines, by the dental practitioner leads to devastating personal, social, and professional consequences. The abuser jeopardizes his or her reputation, family relationships, professional practice, and, not uncommonly, his or her very life through accidental overdose of drugs or by suicide. Nitrous oxide abuse is particularly prevalent among dentists and, although producing no psychological dependence, may result in long-term myeloneuropathy and physical disability making continued dental practice impossible. The dentist's responsibilities in this area lie within clinical and social domains. Clinically, the dentist must (1) learn to detect those physical and behavioral signs in patients that are indicators of drug abuse; (2) become familiar with tactics employed by drug abusers to obtain drugs for themselves or for further criminal diversion, and be prepared to defend against such tactics; (3) understand and make clinical allowance for therapeutic complications that may arise in the treatment of drug-abuse patients. The dentist's social role as an informed, concerned, and empathic counselor in matters of drug abuse must be assumed as a personal imperative and not viewed as an intellectual abstraction. Whenever we are made aware of the drug-related devastation or death of a friend, colleague, or student, we discern the immediacy of an ethical responsibility of social dimensions, so eloquently expressed over 350 years ago, by John Donne in his "Devotions XVII": "No man is an island, ... Any man's death diminishes me, because I am involved in Mankind; And therefore never send to know for whom the

  9. Relationships between daily total fluoride intake and dental fluorosis and dental caries

    Institute of Scientific and Technical Information of China (English)

    Quanyong Xiang; Minghao Zhou; Ming Wu; Xinya Zhou; Li Lin; Jiuning Huang; Youxing Liang

    2009-01-01

    Objective:To explore the relationships between the dally total intake of fluoride,dental fluorosis and dental caries.Methods:An epidemiological method was used to investigate the daily total intake of fluoride,dental fluorosis,and dental caries among 236 and 290 children aged 8-13 years in a severe endemic area and in a non-fluorosis control area,respectively.The children were divided into eight subgroups according to each child's estimated dally total intake of fluoride.The prevalence of dental fluorosis and dental caries in each group was calculated.Results:As expected,elevated levels of fluoride intake were significantly associated with a higher prevalence of dental fluorosis and an increasing amount of more severe defect dental fhiorosis.When the dally total F intake was 2.78 rag/child/day,the prevalence of dental fluorosis was nearly 100%,with the prevalence of defect dental fluorosis increasing with increasing fluoride intake.There was also a significant negative(inverse) dose-response relationship between the dally total intake of fluoride and the overall preva-lence of dental caries,the prevalence of which decreased when the daily total intake of fluoride increased up to 3.32 mg/child/day.However,at higher levels of daily total intake of fluoride the prevalence of dental caries increased,giving rise to a U-shaped dose-response relationship curve.Conclusion:It is important to monitor total fluoride exposure and protect children from excessive fluoride intake,especially during the years of tooth development.

  10. Relationships between dental personnel and non-dental primary health care providers in rural and remote Queensland, Australia: dental perspectives.

    Science.gov (United States)

    Stuart, Jackie; Hoang, Ha; Crocombe, Len; Barnett, Tony

    2017-06-19

    Collaboration between dental practitioners and non-dental primary care providers has the potential to improve oral health care for people in rural and remote communities, where access to oral health services is limited. However, there is limited research on collaboration between these professional disciplines. The purpose of this paper was to explore the relationships between dental practitioners and non-dental primary care providers from rural and remote areas of Queensland and to identify strategies that could improve collaboration between these disciplines from the perspective of dental participants. Semi-structured interviews were conducted between 2013 and 2015 with visiting, local and regional dental practitioners (n = 12) who had provided dental services to patients from eight rural and remote Queensland communities that did not have a resident dentist. Participants were purposely recruited through a snow ball sampling technique. Interview data were analysed using thematic analysis with the assistance of QSR Nvivo v.10. Four major themes emerged from the data: (1) Communication between dental practitioners and rural primary care providers; (2) Relationships between dental and primary care providers; (3) Maintenance of professional dualism; (4) Strategies to improve interprofessional relationships (with subthemes: face to face meetings; utilisation of technology; oral health training for primary care providers; and having a community based oral health contact person). Participants observed that there was a lack of communication between the dental providers who saw patients from these rural communities and the primary care providers who worked in each community. This was attributed to poor communication, the high turnover of staff and the siloed behaviours of some practitioners. Visiting dental practitioners were likely to have stronger professional relationships with hospital nursing, administrative and allied health care staff who were often long term

  11. Intra-arch dimensional measurement validity of laser-scanned digital dental models compared with the original plaster models: a systematic review.

    Science.gov (United States)

    De Luca Canto, G; Pachêco-Pereira, C; Lagravere, M O; Flores-Mir, C; Major, P W

    2015-05-01

    A systematic review was undertaken to evaluate the validity of intra-arch dimensional measurements made from laser-scanned digital dental models in comparison with measurements directly obtained from the original plaster casts (gold standard). Finally included articles were only those reporting studies that compared measurements from digital models produced from laser scanning against their plaster models. Measurements from the original plaster models should have been made using a manual or digital caliper (gold standard). Articles that used scans from impressions or digital photographs were discarded. Detailed individual search strategies for Cochrane, EMBASE, MEDLINE, PubMed, and LILACS were developed. The references cited in the selected articles were also checked for any references that could have been missed in the electronic database searches. A partial gray literature search was undertaken using Google Scholar. The methodology of selected studies was evaluated using the 14-item quality assessment tool for diagnostic accuracy studies (QUADAS). Only 16 studies were finally included for the qualitative/quantitative synthesis. The selected studies consistently agree that the validity of measurements obtained after using a laser scanner from plaster models is similar to direct measurements. Any stated differences would be unlikely clinically relevant. There is consistent scientific evidence to support the validity of measurements from digital dental models in comparison with intra-arch dimensional measurements directly obtained from them. © 2015 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  12. Analysis of Dental Maturation in Relation to Sagittal Jaw Relationships

    Science.gov (United States)

    Durka-Zając, Magdalena; Derwich, Marcin; Mituś-Kenig, Maria; Łoboda, Magdalena; Pawłowska, Elżbieta

    2017-01-01

    Summary Background The degree of mineralization of permanent tooth germs in dental age assessment has been an area of interest among many authors for years. However, only recently have researchers attempted to determine the potential interdependencies between dental age and jaw relationships. The aim of this work was to compare dental maturation in patients with skeletal Class II to patients with skeletal Classes I and III. Material/Methods The study involved 150 patients who sought orthodontic treatment. Dental age was assessed from panoramic radiographs using the Demirjian’s method. Skeletal class was evaluated according to the value of the ANPg angle from the Björk’s analysis. We used the analysis of variance (ANOVA) and the Student’s t-test. Results The mean dental age in patients with skeletal Class III was significantly higher than the mean dental age in patients with skeletal Class II (p<0.0005). A correlation between the dental age and chronological age was established. The weakest correlation was seen between the dental age and skeletal Class II. Among patients with skeletal Class II, the strongest correlation was found between chronological age and the formation of the germ of the second lower premolar (r=0.67; p<0.001). Conclusions Dental age among patients with skeletal Class II was the lowest. PMID:28203310

  13. Dental anxiety and personality: investigating the relationship between dental anxiety and self-consciousness.

    Science.gov (United States)

    Economou, George C

    2003-09-01

    This study investigated whether personality plays a role in a condition called dental anxiety. Specifically, the study examined the relationship between dental anxiety (the negative response to the stress elicited from a dental interaction) and self-consciousness (the tendency to evaluate aspects of oneself that are subject to private and public display). The purpose of this study was to identify the characteristics possessed by dentally anxious individuals who face potential health risks because of their avoidance. Sixty York University undergraduate students were recruited by convenience sampling to participate. These subjects completed Corah's Dental Anxiety Scale and the Self-Consciousness Scale. The Self-Consciousness Scale consists of three subscales, including private self-consciousness, public self-consciousness, and social anxiety. Results indicated an 0.54 significant correlation between dental anxiety and self-consciousness. The public self-consciousness and social anxiety subscales correlated the most with dental anxiety. Furthermore, the data did not indicate a significant moderating relationship for gender between the two aforementioned variables. These results contribute to the establishment of personality characteristics as one of the dimensions determining dental anxiety.

  14. Intraoral gothic arch tracing.

    Science.gov (United States)

    Rubel, Barry; Hill, Edward E

    2011-01-01

    In order to create optimum esthetics, function and phonetics in complete denture fabrication, it is necessary to record accurate maxillo-mandibular determinants of occlusion. This requires clinical skill to establish an accurate, verifiable and reproducible vertical dimension of occlusion (VDO) and centric relation (CR). Correct vertical relation depends upon a consideration of several factors, including muscle tone, inter-dental arch space and parallelism of the ridges. Any errors made while taking maxillo-mandibular jaw relation records will result in dentures that are uncomfortable and, possibly, unwearable. The application of a tracing mechanism such as the Gothic arch tracer (a central bearing device) is a demonstrable method of determining centric relation. Intraoral Gothic arch tracers provide the advantage of capturing VDO and CR in an easy-to-use technique for practitioners. Intraoral tracing (Gothic arch tracing) is a preferred method of obtaining consistent positions of the mandible in motion (retrusive, protrusive and lateral) at a comfortable VDO.

  15. Systematic review of short- (5-10 years) and long-term (10 years or more) survival and success of full-arch fixed dental hybrid prostheses and supporting implants.

    Science.gov (United States)

    Kwon, TaeHyun; Bain, Paul A; Levin, Liran

    2014-10-01

    The aim of this systematic review was to investigate the short-term (5-10 year mean follow-up) and long-term (10 year or more) survival and success of fixed full arch dental hybrid prosthesis and supporting dental implants. Studies reporting interventions with full-arch fixed dental hybrid prostheses were identified by searching PubMed/Medline (NCBI), Web of Science (Thomson Reuters), the Cochrane Register of Controlled Clinical Trials (EBSCO), and Dentistry and Oral Sciences Source (DOSS; EBSCO) from the earliest available dates through July 17, 2013. Through a series of review process by two examiners, potentially qualifying studies were identified and assessed with respect to the inclusion criteria. A total of 18 studies were included for the quality assessment and the systematic review. Within the limitation of available studies, high short-term survival rates of full arch fixed dental hybrid prostheses (93.3-100%) and supporting implants (87.89-100%) were found. However, the availability of studies investigating long-term outcomes seemed scarce. Furthermore, the included studies were subjected to potential sources of bias (i.e. publication, reporting, attrition bias). Despite seemingly high short-term survival, long-term survival of implant supported full arch fixed dental hybrid prosthesis could not be determined due to limited availability of true long-term studies. Although it may be a valuable option for a patient with a completely edentulous ridge(s), the strategic removal of teeth with satisfactory prognosis for the sake of delivering an implant supported full-arch dental hybrid prosthesis should be avoided. Copyright © 2014 Elsevier Ltd. All rights reserved.

  16. Examining the relationship between skull size and dental anomalies

    OpenAIRE

    Krecioch, Joseph

    2014-01-01

    This study, reporting the results of a 2012 Master’s dissertation, of 131 skulls from 6 Classical to Medieval populations in Macedonia and England examined the relationship between craniometric variables and dental anomalies of shape, number, and position. Standard craniometric landmarks were measured and dental anomalies of shape, number, and position were recorded and tested for associations using SPSS. Rotations were the most common anomaly and were associated significantly with reduced ...

  17. 虚拟牙齿矫正过程中的牙弓绘制方法研究%Research on the Methods of Drawing Dental Arch during Virtual Orthodontics Treatment Process

    Institute of Scientific and Technical Information of China (English)

    王增波

    2011-01-01

    Several mathematic models of dental arch form were reviewed; the drawing methods of dental arch were introduced and compared. Beta function method that determine the ideal dental arch curve is through five points which are the central incisors cusp lips, the double canine cusp tips and the distobuccal cusp tips of the second molars. This method is better than others in approximation, and provides more ideal criteria for tooth or thodontic treatment. It is developed by calling functions from OpenGL graphic library through VC + + ,and re alizes drawing a dental arch curve.%回顾了主要的牙弓形态数学模型,对各种牙弓绘制方法进行了介绍和比较.其中的β函数法通过中切牙接触点、双侧尖牙牙尖点和双侧第二恒磨牙远中颊尖点五个点来确定理想牙弓弓形曲线,该方法较其它的方法拟合度更加好,为牙齿矫正提供了较理想的判别标准.最后采用Visual C++为编程语言,以OpenGL为图形开发工具,实现了牙弓曲线的绘制.

  18. Measurementand correlation analysis between the mandibular dental and basal arch forms in three skeletalmalocclusions%三类骨性错牙合下颌牙弓和基骨弓的测量及相关性分析

    Institute of Scientific and Technical Information of China (English)

    林思豆; 吴补领; 孙风阳; 田智慧; 钟恩意; 慈博雯; 黄文华

    2016-01-01

    目的:探讨骨性错牙合与个别正常牙合下颌牙弓、基骨弓的形态差异及相关性。方法27例骨性Ⅰ类错牙合、30例骨性Ⅱ类错牙合、20例骨性Ⅲ类错牙合及27例个别正常牙合于正畸治疗前进行锥形束CT扫描,获得下颌虚拟模型,分别测量牙弓、基骨弓的长、宽度,分析指标间的差异及相关性,并拟合牙弓、基骨弓的形态曲线。结果Ⅲ类错牙合的基骨弓长、宽度显著大于其余三组,牙弓宽度显著大于Ⅱ类错牙合,Ⅱ类错牙合的前牙牙弓长度显著大于其余三组。牙弓、基骨弓在尖牙间、磨牙间宽度及全牙段长度的相关系数r分别为0.818、0.836、0.818,前牙长度r为0.395。结论Ⅲ类错牙合基骨发育过度,Ⅱ类错牙合前牙弓最长以弥补其基骨发育不足;牙弓与基骨弓存在相关。%Objective To investigate the differences and correlations between the mandibular dental and basal arch forms in subjects with normal occlusion and those of skeletal malocclusions. Methods Virtual pretreatment mandibular models of patients (27 Class I,30 Class II, 20 Class III and 27 normal occlusion) were selected to measure widths and lengths of dental and basal arch. The differences and correlations between indicators were analyzed, and then fitting curves of dental and basal arch were made. Results The mandibular basal arch widths and lengths were significantly greater in the Class III group compared to other groups, the dental arch widths were significantly greater in the ClassⅢgroup compared to the Class II group, the anterior dental lengths were significantly greater in the Class Ⅱ group compared to other groups. The widths in canine, molar regions and the whole arch lengths of dental and basal arch demonstrated high correlation coefficient (r=0.818, 0.836, 0.818), the anterior arch lengths demonstrated low correlation coefficient(r=0.395). Conclusions The basal arch of Class III group is

  19. Effects of early and late cheiloplasty on anterior part of maxillary dental arch development in infants with unilateral complete cleft lip and palate

    Directory of Open Access Journals (Sweden)

    Silvia Valentová-Strenáčiková

    2016-02-01

    Full Text Available Objectives. The objective of this study is to compare the impact of early and late reconstruction of complete unilateral cleft lip and palate on the growth and development of the front of the dentoalveolar arch. Methods. This study was carried out in the years 2012–2015 at the Clinic of Plastic, Reconstructive and Aesthetic Surgery in Banska Bystrica. Infants with unilateral complete cleft lip and palate were divided into 2 groups according to the timing of lip reconstruction. Group A consisted of infants with early lip reconstruction–realised in the first 14 days of life. Group B consisted of infants with later lip reconstruction–realised in the third month of age. Maxillary dental casts were obtained for each child in four periods–in the first 14 days of life, in the third month, in the sixth month and in the age of one year. These were followed by the identification, measurement and evaluation of anthropometric parameters. Results. Significant differences were occurred after the reconstruction of the lips in linear and angle measurements between infants in the A and B groups. Conclusion. The early surgical reconstruction of the lips in the first 14 days of life has a positive effect on the growth and development of the anterior segment of the dentoalveolar arch. Early lip reconstruction forms a continuous pressure on the frontal segment, resulting in the earlier remedy of anatomical properties and creates appropriate conditions for the best development of this area.

  20. The Relationship Between Dietary Factors and Dental Caries.

    Science.gov (United States)

    Watson, M. Lisa

    1982-01-01

    The relationship between the development of tooth decay and the diet includes a multitude of variables other than sugar. However, the frequency with which food is consumed and its consistency or stickiness may be primary contributors to the development of dental caries. (JN)

  1. The Relationship Between Dietary Factors and Dental Caries.

    Science.gov (United States)

    Watson, M. Lisa

    1982-01-01

    The relationship between the development of tooth decay and the diet includes a multitude of variables other than sugar. However, the frequency with which food is consumed and its consistency or stickiness may be primary contributors to the development of dental caries. (JN)

  2. 种植支持全牙弓和分段式修复无牙颌的效果观察%Observation on the Effect of Dental Implant Supported the Whole Dental Arch and Segmented Restoration

    Institute of Scientific and Technical Information of China (English)

    范胤

    2016-01-01

    目的:对比种植支持全牙弓和分段式修复无牙颌的效果。方法以我院2015年4月~2016年5月收治的42例无牙颌患者作为研究对象,采用随机数法将患者分为两组,各21例。观察组用种植支持全牙弓治疗,对照组用分段式修复治疗。结果观察组患者治疗后的美观评价水平、维护方便程度、总体满意度高于对照组,比较差异有统计学意义(P<0.05)。结论采用种植支持全牙弓治疗无牙颌治疗效果好。%Objective To compare the effects of dental implant supported total dental arch and segmental restoration in the restoration of the jaw. Methods From April 2015 to May 2016 in our hospital 42 cases of patients with non dental jaw patients as the research object, using the random number method will be divided into two groups, each of 21 cases. The observation group was treated with dental implants, and the control group was treated with staged repair. Results In the observation group after treatment, the level of aesthetic evaluation, maintenance convenience, overall satisfaction rate was higher than the control group, the difference was significant (P<0.05). Conclusion The clinical application of dental implants in the treatment of the patients with no teeth jaw.

  3. What about the dentist-patient relationship in dental tourism?

    Science.gov (United States)

    Conti, Adelaide; Delbon, Paola; Laffranchi, Laura; Paganelli, Corrado

    2014-03-01

    Dental tourism is patients travelling across international borders with the intention of receiving dental care. It is a growing phenomenon that raises many ethical issues, particularly regarding the dentist-patient relationship. We discuss various issues related to this phenomenon, including patient autonomy over practitioner choice, patient safety, continuity of care, informed consent and doctor-patient communication, among other factors. In particular, patients partaking in medical tourism should be informed of its potential problems and the importance of proper planning and post-treatment care to guarantee high-quality treatment outcomes.

  4. Dimensional and discrete dental trait asymmetry relationships.

    Science.gov (United States)

    Mayhall, J T; Saunders, S R

    1986-03-01

    Inuit (Eskimos) from the Foxe Basin region of the Northwest Territories, Canada, were studied to ascertain the amount of dimensional and morphological asymmetry in their dentitions. The results indicate that dimensional asymmetry does not appear to be greater on either the maxillary or mandibular teeth. Both types of asymmetry show partial conformity to the model of tooth fields with an increasing amount of asymmetry as one goes distally in each tooth group. The morphological asymmetry exception, the mandibular incisors, follows Dahlberg's "Field Concept." Rank-order correlations between the amount of dimensional asymmetry and morphological asymmetry reveal no detectable patterns. There appear to be no associations between the presence or absence of morphological asymmetry and the size of the tooth. This lack of association might be explained by differences in developmental timing of tooth dimensions and morphological traits; however, such a hypothesis requires experimental testing. In this population and those for which published results are available, it is practically impossible to overcome the "noise" level and test recent hypotheses regarding random dental asymmetry.

  5. A quadrant tray and bite registration as an alternative to dual-arch impressions for fixed prosthetics: a clinical and dental laboratory technique.

    Science.gov (United States)

    Hammond, Barry D; Myers, Michael L; Haywood, Van B

    2011-01-01

    To perform fixed prosthodontic procedures, dentists take a full-arch or quadrant impression and articulate the casts. The dual-arch impression technique is a popular quadrant technique for crown fabrication. The technique described in this article, which uses a quadrant impression and separate interocclusal record, offers several advantages over the traditional dual-arch method.

  6. Relationship between untreated dental caries and dental neglect among mentally handicapped children: A cross-sectional study

    Directory of Open Access Journals (Sweden)

    Amit Kumar

    2015-01-01

    Full Text Available Introduction: Dental caries is the most prevalent disease among mentally handicapped (MH children worldwide. Dental neglect may throw light on complex relationships between individual behavior, environmental factors, and dental caries in children. Objectives: The objective was to assess the prevalence and severity of untreated dental caries and to explore the relationship between untreated dental caries and dental neglect among MH children and healthy children in Bangalore city. Materials and Methods: A cross-sectional comparative study was conducted on 130, 6-17 years MH and 152 healthy school children in Bangalore city. A questionnaire on the children′s sociodemographic background, oral health-related behaviors, and dental neglect scale was completed by the parents. Caries was assessed according to World Health Organization criteria (1997. Odontogenic infections were recorded using the pufa/PUFA index. Statistical tests such as Mann-Whitney U-test, Chi-square test, Spearmans correlation, and step-wise linear regression were performed at significance level P < 0.05. Results: Dental caries was present in 89.2% of MH children as compared with 88.15% of the healthy children. Caries experience significantly correlated with consequences of untreated dental caries in both the groups (P = 0.001. No statistical significant correlation was observed between dental neglect and dental caries experience and its consequences in both the groups. Conclusions: High prevalence of dental caries and dental neglect in both the groups calls for an integrated approach. Oral health promotion and intervention programs should be targeted and concentrated toward these risk groups.

  7. 单颌牙弓夹板+颌内钢丝结扎法治疗下颌骨正中骨折16例%Single Maxillary Dental Arch Splint+Jaw Steel Wire Ligation in Treatment of 12 Cases of Fracture of Mandibular Median

    Institute of Scientific and Technical Information of China (English)

    潘树矿; 陆开睿

    2015-01-01

    目的探讨单纯性下颌骨正中骨折的非手术治疗方式。方法应用单颌牙弓夹板和颌内钢丝结扎对下颌骨骨折处进行固定制动4w,为下颌骨正中骨折的愈合创造固定的外部条件。结果16例下颌骨正中骨折的患者4 w后拆除牙弓夹板,骨折断端愈合良好,咬合关系恢复正常。结论单颌牙弓夹板和颌内钢丝结扎治疗单纯性下颌骨正中骨折,能对骨折处有效的制动,有利于口腔卫生的保持,避免二次手术拆除内固定所用的钛板,经济实用。%Objective To study the non operation treatment of simple mandibular fracture.Methods Applicationofsinglemaxil arydental arch splint and intermaxil ary wiring on mandibular fracture were fixed brake 4 weeks, healing of mandibular fracture fixation for the creation of the external conditions. Results 16 cases of mandibular fractures in patients with the 4 week after removal of dental arch splint broken ends of fracture healing, good, normal occlusal relationship. Conclusion Single maxil ary dental arch splint and jaw steel wire ligation in the treatment of median simple mandible fracture, fracture is ef ective to brake, is conducive to maintaining oral hygiene, avoid titanium plate two times operation removal of internal fixation using, economical and practical.

  8. Long-term effect of quad helix expansion of dental arch*☆%四圈簧扩大牙弓的长期效果*☆

    Institute of Scientific and Technical Information of China (English)

    王峰; 陆怀秀; 林松杉

    2013-01-01

      背景:快速扩大牙弓是快速扩大颌骨的有效方法,而与快速扩展相比,缓慢扩展稳定性更高,复发更少,但四圈簧扩弓的长期稳定性少见报道。目的:回顾性分析正畸临床中四圈簧扩大牙弓的临床效果。方法:混合牙列期及恒牙列早期牙弓狭窄患者22例使用四圈簧扩大牙弓至少3 mm,在扩大牙弓之前(T1期)、Ⅰ期四圈簧扩弓治疗完成或整个治疗结束(T2期)及治疗完成后2年(T3期)分别制取牙齿石膏研究模型并摄取头颅后前位片,在模型上测量两侧第一恒磨牙之间距离,在后前位片上描点(J 点)测量两侧基骨间距离及磨牙倾斜度,评价牙弓扩大的矫正及矫形效果。结果与结论:与扩弓前相比,四圈簧扩弓治疗后患者第一恒磨牙倾斜度和两侧基骨间距离逐渐减小;而四圈簧扩弓治疗后相比,随访2年时,患者两侧第一恒磨牙间距离、第一恒磨牙倾斜度和两侧基骨间距离的差异无显著性意义(P >0.05),提示四圈簧扩大牙弓的长期效果是稳定的,并有矫形效果。%BACKGROUND: Rapid expansion of the dental arch is an effective way to rapidly expanse the jaw. Compared with rapid expansion, the slow expansion has higher stability and less recurrence, but the reports on the long-term stability of quad helix expansion are rare. OBJECTIVE: To retrospectively analyze the clinical effect of quad helix expansion in orthodontics. METHODS: Twenty-two subjects with dental arch stenosis in mixed dentition and early permanent dentition who experienced an expansion of at least 3 mm with quad helix appliance were selected for this study. Plaster dental casts and posteroanterior radiographs were evaluated at the beginning of the treatment (T1), at the completion of phase I quad helix expansion or ful treatment (T2), and approximately 2 years fol owing the completion of treatment (T3). The distance between two first molars was

  9. Implant-supported prosthesis misalignment related to the dental arch: a 14-year clinical follow-up.

    Science.gov (United States)

    das Neves, Flávio Domingues; Coró, Vitor; da Silva Neto, João Paulo; de Mattias Sartori, Ivete Aparecida; do Prado, Ricardo Alves

    2012-08-01

    The purpose of this study was to warn the dental community about a possible problem in function with partial implant-supported prostheses used for long periods. The misalignment between natural teeth and the implant-supported prosthesis on teeth 11 and 12, observed in a 14-year clinical follow-up, illustrates the fact. The metal-ceramic crowns were placed in 1995 after a rigorous occlusal adjustment. Evaluations were made at 4, 6, 9, and 14 years, when it was noticed that the restorations were positioned palatally and extruded in comparison with the natural teeth. After 9 years, a greater discrepancy was noticed, with anterior occlusion and esthetic changes. The possible causes have been discussed: occlusal problems, parafunctional habits, and natural movement. The first 2 options were discarded after clinical analysis and diagnosis. Therefore, the natural movement probably deriving from an interaction of mechanical and genetic factors might have been the cause. The implants do not have periodontal ligaments but rather ankylosis, so they do not suffer those movements. This case emphasizes the need to inform patients that implants can last more than 10 years in function, but this is not the case with restorations, which lose function and esthetics and must be replaced.

  10. Evaluation of accuracy of complete-arch multiple-unit abutment-level dental implant impressions using different impression and splinting materials.

    Science.gov (United States)

    Buzayan, Muaiyed; Baig, Mirza Rustum; Yunus, Norsiah

    2013-01-01

    This in vitro study evaluated the accuracy of multiple-unit dental implant casts obtained from splinted or nonsplinted direct impression techniques using various splinting materials by comparing the casts to the reference models. The effect of two different impression materials on the accuracy of the implant casts was also evaluated for abutment-level impressions. A reference model with six internal-connection implant replicas placed in the completely edentulous mandibular arch and connected to multi-base abutments was fabricated from heat-curing acrylic resin. Forty impressions of the reference model were made, 20 each with polyether (PE) and polyvinylsiloxane (PVS) impression materials using the open tray technique. The PE and PVS groups were further subdivided into four subgroups of five each on the bases of splinting type: no splinting, bite registration PE, bite registration addition silicone, or autopolymerizing acrylic resin. The positional accuracy of the implant replica heads was measured on the poured casts using a coordinate measuring machine to assess linear differences in interimplant distances in all three axes. The collected data (linear and three-dimensional [3D] displacement values) were compared with the measurements calculated on the reference resin model and analyzed with nonparametric tests (Kruskal-Wallis and Mann-Whitney). No significant differences were found between the various splinting groups for both PE and PVS impression materials in terms of linear and 3D distortions. However, small but significant differences were found between the two impression materials (PVS, 91 μm; PE, 103 μm) in terms of 3D discrepancies, irrespective of the splinting technique employed. Casts obtained from both impression materials exhibited differences from the reference model. The impression material influenced impression inaccuracy more than the splinting material for multiple-unit abutment-level impressions.

  11. The relationships between foot arch volumes and dynamic plantar pressure during midstance of walking in preschool children.

    Directory of Open Access Journals (Sweden)

    Hsun-Wen Chang

    Full Text Available OBJECTIVES: The purpose of this study was to examine the correlation between the foot arch volume measured from static positions and the plantar pressure distribution during walking. METHODS: A total of 27 children, two to six years of age, were included in this study. Measurements of static foot posture were obtained, including navicular height and foot arch volume in sitting and standing positions. Plantar pressure, force and contact areas under ten different regions of the foot were obtained during walking. RESULTS: The foot arch index was correlated (r = 0.32 with the pressure difference under the midfoot during the foot flat phase. The navicular heights and foot arch volumes in sitting and standing positions were correlated with the mean forces and pressures under the first (r = -0.296∼-0.355 and second metatarsals (r = -0.335∼-0.504 and midfoot (r = -0.331∼-0.496 during the stance phase of walking. The contact areas under the foot were correlated with the foot arch parameters, except for the area under the midfoot. CONCLUSIONS: The foot arch index measured in a static position could be a functional index to predict the dynamic foot functions when walking. The foot arch is a factor which will influence the pressure distribution under the foot. Children with a lower foot arch demonstrated higher mean pressure and force under the medial forefoot and midfoot, and lower contact areas under the foot, except for the midfoot region. Therefore, children with flatfoot may shift their body weight to a more medial foot position when walking, and could be at a higher risk of soft tissue injury in this area.

  12. 应用LOM法制作-下颌骨及牙列的三维实体模型%3D Solid Model of Mandible with Dental Arch via LOM Method

    Institute of Scientific and Technical Information of China (English)

    张睿; 李玲; 于力牛; 白瑞军; 张富强; 王成焘; 徐肖云

    2000-01-01

    Objective Based on 3D reconstruction data from CT scaning, a solid model of mandible with dental arch is ob tained via a rapid prototype machine using LOM method. Method 3D reconstruction data is transferred to STL file using software of Delcam(UK) , which will be fed to Magics RP software for detection and rebuilding. Reproduction of the papery model of mandible with dental arch is then performed with highly geometric sunilarity. Result The RP model of mandible with dental arch is obtained. Conclusion Accuracy of the reproduction model meets the demands of studies in prosthetic dentist, which gives the possibility of computer aided design of prosthetic dentistry based on 3D solid model.%采用基于CT断层影像的下颌骨及牙列三维重建数据,利用快速成型中的分层制造方法复制下颌骨 及牙列。方法利用Delcam公司(UK)软件将下颌骨及牙列三维重建的数据文件转换为STL文件,采用Magics RP 软件读入STL文件并进行检验与修补。制作下颌骨及牙列纸质实物模型,与下颌骨及牙列标本模型的几何相似性 良好。结果得到了下颌骨及下牙列的快速原型模型。结论下颌骨及牙列复制模型精度符合口腔修复中的要 求,可在其计算机三维实体模型基础上进行牙列缺损的计算机辅助修复设计。

  13. Dental anxiety and its relationship with self-perceived health locus of control among Indian dental students.

    Science.gov (United States)

    Acharya, Shashidhar; Sangam, Dattatreya Krishnarao

    2010-01-01

    The objective of the present study was to assess dental anxiety and study its relationship with the perceived Health Locus of Control (HLC) among students in an Indian dental school. A total of 325 students returned completed history forms that consisted of the Multidimensional Health Locus of Control (MHLC) scale and the Modified Dental Anxiety Scale (MDAS). 'Fear of the needle' was the greatest stimulus of dental anxiety with a mean score of 3.3, which was followed by 'tooth drilling' whose mean score was 2.7. There was also a statistically significant decrease in the mean scores for all of the MDAS items from 1st year to 4th year, except the item related to local anaesthetic injection, whose mean score remained high throughout. The mean scores of the three aspects of the MHLC scale (internal, chance and powerful others) were compared with respect to dental anxiety. The results showed that 'internal' was the most powerful of the three aspects of MHLC among all three anxiety groups. The mean 'internal' score for the low anxiety group was 4.4, which reduced to 4.1 for the high anxiety group. A statistically significant inverse correlation was also found between the 'internal' dimension of MHLC and dental anxiety. Perceived HLC was found to play an important role in predicting the dental anxiety among dental students.

  14. Semi- and Nonparametric ARCH Processes

    Directory of Open Access Journals (Sweden)

    Oliver B. Linton

    2011-01-01

    Full Text Available ARCH/GARCH modelling has been successfully applied in empirical finance for many years. This paper surveys the semiparametric and nonparametric methods in univariate and multivariate ARCH/GARCH models. First, we introduce some specific semiparametric models and investigate the semiparametric and nonparametrics estimation techniques applied to: the error density, the functional form of the volatility function, the relationship between mean and variance, long memory processes, locally stationary processes, continuous time processes and multivariate models. The second part of the paper is about the general properties of such processes, including stationary conditions, ergodic conditions and mixing conditions. The last part is on the estimation methods in ARCH/GARCH processes.

  15. Relationship of children's anxiety to their potential dental health behaviour.

    Science.gov (United States)

    Wright, F A

    1980-08-01

    In this study of 200 New Zealand schoolchildren aged 7-13 years, a questionnaire interview was used to gain information related to estimating dental anxiety and general illness anxiety. Information related to sociodemographic differences, belief differences, and an estimate of potential health behaviour was also collected. Oral examinations were performed and the number of dental restorations present recorded. Dental anxiety was associated with memory of pain during a dental visit. The number of restorations present, and a history of pain during a dental visit, were important predictors of illness anxiety. Neither dental anxiety nor illness anxiety operating alone provided an estimate of future dental health behaviour. Dental anxiety and illness anxiety operated through a complex interplay of variables. A stepwise multiple regression technique was used to determine the possible pathways to potential dental health behaviour. Perceived vulnerability to dental caries and perceived severity of dental disease were important in the prediction of potential denture wearing; school attended and ethnic background were useful predictors of potential extraction seeking; and school grade and level of perceived internal control were predictors of potential preventive visitation.

  16. Common Fears and Their Relationship to Dental Fear and Utilization of the Dentist

    OpenAIRE

    Fiset, Louis; Milgram, Peter; Weinstein, Philip; Melnick, Sandra

    1989-01-01

    Common fears were studied by household telephone interviews and mail survey in Seattle, Washington, to determine their relationship to dental fear and to utilization of the dentist. Dental fear was either the first or second most common fear, with a prevalence estimated between 183 and 226 persons per 1000 population. Dental fear was associated with fears of heights, flying, and enclosures. Respondents with multiple common fears other than fear of dentistry were more likely to delay or cancel...

  17. A CBCT study on Morphological characteristics of dental arches in subjects with unilateral maxillary canine impaction%利用锥形束CT研究单侧上颌尖牙埋伏阻生患者牙弓形态特点

    Institute of Scientific and Technical Information of China (English)

    韩天媛; 刘志杰; 邵玶

    2016-01-01

    目的 利用锥形束CT(Cone beam computed tomography,CBCT)研究单侧上颌尖牙埋伏阻生患者牙弓形态特点,为研究其病因及预防继发病症提供参考.方法 39名单侧上颌尖牙埋伏阻生患者,其中腭侧埋伏19名,唇侧埋伏20名,另设正常对照20名.三组患者年龄无显著性差异.三组患者拍摄CBCT并对牙弓的影像进行测量,比较三组之间以及阻生侧与非阻生侧的牙弓形态特点.结果 尖牙阻生患者的双侧牙弓比较显示,阻生侧前段及整侧牙弓长度均比非阻生侧小(P<0.001).腭侧组第一磨牙到腭中缝距离(24.06±1.68) mm小于唇侧组(24.86±1.31)mm和对照组(24.88±1.12) mm,腭侧组牙弓周长(72.29±3.50) mm小于唇侧组(75.96±5.26) mm,P<0.05.结论 上颌尖牙埋伏阻生可能与牙弓长度(尤其是前段)较短有关,且腭侧阻生可能还与牙弓宽度较小有关.%Objective To examine the relationship between unilateral maxillary canine impaction and the morphological characteristics of the maxillary dental arches using Cone beam computed tomography(CBCT).Methods 39 patients with unilateral impacted canine were selected,including 19 palatal impaction (UPI) (mean age:16.21 ± 4.14 years) and 20 buccal impaction (UBI).20 normal patients served as control,with matched ages.CBCT images for the three groups were taken and compared for arch characterestics.Results The anterior and whole dental arch lengths of impaction side were smaller than that of normal sides (P<0.001).The first molar to midpalatal suture distances of UPI group were smaller than the other groups and the arch perimeter of it was smaller than UBI group(P<0.05).Conclusions The short arch lengths (especially in anterior part) may have effect on the occurrence of unilateral maxillary canine impaction.UPI may also be related to a smaller arch width.

  18. The knowledge level of dental surgeons regarding the relationship between occlusal factors and Temporomandibular Disorders (TMD)

    OpenAIRE

    Jefferson Filippo Castro de ASSIS; SILVA,Pâmela Lopes Pedro da; LIMA,Jully Anne Soares de; FORTE,Franklin Delano Soares; Batista,André Ulisses Dantas

    2015-01-01

    AbstractIntroductionThe relationship between dental occlusion and temporomandibular disorders (TMD) remains a subject of disagreement. Many professionals erroneously base diagnosis and treatment strictly on the occlusal factor, despite the fact that current scientific evidence does not show such a relationship.ObjectiveTo evaluate the knowledge of dental surgeons (DSs) from João Pessoa (PB)-Brazil, regarding the relationship between occlusal factors and TMD.Materials and methodA sample of 100...

  19. Model analysis of changes in dental arch width before and after orthodontic treatment with MBT appliance%MBT矫治前后牙弓宽度变化的模型分析研究

    Institute of Scientific and Technical Information of China (English)

    张良

    2012-01-01

    目的 分析牙列拥挤患者不拔牙与拔牙的MBT矫治对牙弓宽度变化的影响.方法 选择我院正畸科2008-2011年MBT矫治器治疗的牙列拥挤患者40例.其中轻中度牙列拥挤患者20例,使用MBT矫治器进行不拔牙正畸;中重度牙列拥挤患者20例,使用MBT矫治器进行拔除4颗第一前磨牙的拔牙正畸.测量术前术后石膏模型的牙弓宽度,对矫治前后不拔牙组和拔牙组的测量数据分别进行组内、组间统计学分析.结果 矫治前后不拔牙组:上颌尖牙间宽度增大,上下颌第一前磨牙、第一磨牙间宽度增大,有统计学意义;拔牙组:上颌尖牙间宽度增大,上下颌第二前磨牙、第一磨牙间宽度变小,有统计学意义.矫治前2组上下颌尖牙、第一磨牙间牙弓宽度相近,无统计学差异;矫治后不拔牙组上下颌第一磨牙间牙弓宽度大于拔牙组,有统计学意义,2组上下颌尖牙间牙弓宽度相近,差异无统计学意义.结论 不拔牙矫治牙弓宽度变化与拥挤部位、拥挤程度有关,拔牙矫治牙弓宽度变化主要与牙齿移动方向有关.拔牙矫治后尖牙间宽度不会减小.%Objective To investigate the changes of dental arch width after extraction and nonextraction treatment with MBT appliance. Methods 40 patients with crowded denture who received treatment with MBT appliance from 2008 to 2011 in our hospital were randomly selected. 20 patients with mild dental crowding who received nonextraction treatment were in the nonextraction group, while 20 patients with severe dental crowding whose 4 first premolars were extracted in the treatment with MBT appliance were in the extraction group. SPSS 11.0 software package was used for paired-samples t Test and independent-samples t Test. Results The upper inter-canine widths, the upper and lower inter-first bicuspid widths, the upper and lower inter-first molar widths of nonextraction cases increased significantly after the treatment. The

  20. Emotional relationships between child patients and their mothers during dental treatments

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    Shizuka Tanaka

    2016-09-01

    Conclusion: These results indicated that uncooperative child patients undergo more stress and their mothers feel more anxiety from dental treatments, resulting in an emotional relationship between children and their mothers, which requires dental professionals to make special considerations to calm the anxiety of the mother, as well as the stress of the child patient.

  1. Dental anxiety and psychological functioning in children: its relationship with behaviour during treatment

    NARCIS (Netherlands)

    Versloot, J.; Veerkamp, J.S.J.; Hoogstraten, J.

    2008-01-01

    In this study the relationship between the levels of dental anxiety, psychological functioning and earlier experience with dental injections are examined and the possible influence of these factors on children's behaviour before and during a local anaesthesia injection. Methods: A total of 128

  2. Assessment of relationship between oral health behavior, oral hygiene and gingival status of dental students

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    Afsheen Lalani

    2015-01-01

    Conclusion: Thus, it is concluded that there is a significant relationship between the oral health behavior, oral hygiene, and gingival status of dental students. Dental students with better self-reported oral health behavior had lower plaque and gingival scores indicating a better attitude toward oral health.

  3. The arches of the Sanctuary of Loyola. The relationship between the Roman project and Spanish building techniques

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    Iacopo Benincampi

    2015-12-01

    Full Text Available The ascent to the throne of Spain in 1714 by Philip V of Bourbon ended the War of the Spanish Succession, and opened a new period of peace and prosperity that is reflected mainly in the building sites sponsored by the Crown, including also the factory of the Sanctuary of Loyola, which restarted the construction under the leadership of Sebastian Lecuna, who was in charge of raising the circular church. However, the complexity of the project, edited by Carlo Fontana and sent from Rome in 1686, and the changes already made in the plant imposed a careful preliminary reflection which resulted in 1719 in a consultation which was attended by the former director of the factory, Martin de Zaldua, the theoretical Benedictine Pedro Martinez de Cardeña and the Salamanca Cathedral master mayor Joaquin de Churriguera. The masters were contacted to express their opinion about the construction of the vaults of the nave ring, the decoration and especially on the most suitable form to be assigned to the arches of the church, a subject of great interest cause of their uniqueness and complexity. In this sense, the loss of the original drawings do not allow a proper understanding neither of the proposals submitted or the final solution adopted but, nevertheless, a careful study of archival records and the reconstruction of the stereotomic geometry underlies these arches now has led to new contributions, which are useful to a greater general understanding of the factory. Keywords: Loyola, Stereotomy, Carlo Fontana, Sebastian Lecuna, arches

  4. The relationship between the quality of education and the poor dental practice: Clinical case report

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    Cléa Adas Saliba Garbin

    2013-01-01

    Full Text Available The activities developed in health area are of great importance, because they have the aim to preserve the life of the men, and therefore, must be performed by authorized persons. The increase of the number of dental schools, the decline at the education quality and a higher admission of students with low ability to exercise their profession, are facts that bring disastrous consequences for society. These facts are, also, reflected at the moral, ethical and technical-scientific performance of the professional. The purpose of this clinic case is to show that although there is a significant suplly of education institutions, there is a lack of scientific and adequate technical knowledgement from the graduated dentals surgeons. The patient MSL, 17 year old, female, went to a dental clinic presenting a tray type Vernis, attached to the lower arch. After clinical evaluation, it was showed that an incorrect material was used for the impression technique, being impossible to take out the tray by the conventional mann r. The planning for the removal of the tray was through the divide of it. Thus, the consequence of the lack of knowledge in the use of impression materials had caused a great incovinience to the patient. It can be concluded that the rate of malpractice is directly related to the professional preparation, highlighting the importance of quality dental education for a responsible clinical practice.

  5. Analysis of the relation between dental arch size and upper airway morphology in patients with obstructive sleep apnea hypoventilation syndrome%阻塞性睡眠呼吸暂停低通气综合征患者的牙弓与上气道形态变化及相关性分析

    Institute of Scientific and Technical Information of China (English)

    徐超; 谢宇平; 秦猛; 何健民; 余奕波; 康宏; 马薇; 惠培林

    2016-01-01

    Objective:To study the anatomical correlation between dental arch and the volume of upper airway in patients with obstruc-tive sleep apnea hypoventilation syndrome(OSAHS). Methods: Dental arch architecture and upper airway volume were measured by cone beam CT(CBCT) in the subjects with OSAHS(n=22) and without OSAHS(n=19). The correlation between dental arch and the supper airway volume in OSAHS patients was analyzed. Results:The length of the upper dental arch and the height of palate in OSAHS patients were larger than those of the controls(All, P<0. 05). Cross-sectional area of nasopharynx and retropalatal and the total volume of upper airway were negatively correlated with the palatal height and upper dental arch length(P<0. 05), while positively correlated with upper dental arch of molar regions(P<0. 05). Conclusion:The abnormal shape of upper dental arch is related to the airway vol-ume of nasopharynx and retropalatal region in patients with OSAHS.%目的::比较阻塞性睡眠呼吸暂停低通气综合征( OSAHS)患者与正常人牙弓及上气道形态差异,揭示OSAHS牙弓形态改变与上气道容积对应变化的关系。方法:利用上气道CBCT扫描及口腔模型测量经PSG诊断为OSAHS的男性患者( n=22)与正常男性对照(n=19)的牙弓形态与上气道容积变化,并行相关性分析。结果:OSAHS组上颌牙弓长度与腭弓高度分别大于对照组(均P<0.05);OSAHS组鼻咽段、腭咽段截面积及上气道总容积与腭弓高度、上颌牙弓长度呈负相关(均P<0.05),与上颌后段牙弓宽度呈正相关关系(P<0.05)。结论:OSAHS患者上颌牙弓形态的异常与鼻咽段和腭咽段容积的变化有关联。

  6. Evaluation of the Occlusion and Arch Dimensions in the Primary Dentition of an Iranian Population

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    Maryam Talebi

    2013-12-01

    Full Text Available Introduction: The objective of this study was to gather information about normal occlusion and arch dimensions in the primary teeth of the children belonging to an Iranian population. Methods: This descriptive cross-sectional study was performed on 68 children from the city of Mashhad in the 3-5 age range. Dental arch dimensions, interrelationships of primary canine and second molars, overbite and overjet were evaluated. Results: Primate space was observed on both sides of the arch in 82.2% of the subjects. The most prevalent type of primary molar relationship was flush terminal plane (52.1% followed by distal step (31.3% and then mesial step (16.7%. The primary canine relationship was ranked in the descending order of prevalence as Class I (77.1%, Class II (13.5%, end-to-end (5.2% and Class III (4.2%. Normal overbite and normal overjet was observed in 50% and 81.3% of cases, respectively. Conclusion: This study provides an insight into the dental arch dimensions, occlusion, spacing and crowding in primary dentition in Iranian children. In most of the cases, primate space and flush terminal plane were observed.

  7. Evaluation of the Occlusion and Arch Dimensions in the Primary Dentition of an Iranian Population

    Directory of Open Access Journals (Sweden)

    Maryam Talebi

    2013-01-01

    Full Text Available Introduction: The objective of this study was to gather information about normal occlusion and arch dimensions in the primary teeth of the children belonging to an Iranian population. Methods: This descriptive cross-sectional study was performed on 68 children from the city of Mashhad in the 3-5 age range. Dental arch dimensions, interrelationships of primary canine and second molars, overbite and overjet were evaluated. Results: Primate space was observed on both sides of the arch in 82.2% of the subjects. The most prevalent type of primary molar relationship was flush terminal plane (52.1% followed by distal step (31.3% and then mesial step (16.7%. The primary canine relationship was ranked in the descending order of prevalence as Class I (77.1%, Class II (13.5%, end-to-end (5.2% and Class III (4.2%. Normal overbite and normal overjet was observed in 50% and 81.3% of cases, respectively. Conclusion: This study provides an insight into the dental arch dimensions, occlusion, spacing and crowding in primary dentition in Iranian children. In most of the cases, primate space and flush terminal plane were observed.

  8. Common fears and their relationship to dental fear and utilization of the dentist.

    Science.gov (United States)

    Fiset, L; Milgrom, P; Weinstein, P; Melnick, S

    1989-01-01

    Common fears were studied by household telephone interviews and mail survey in Seattle, Washington, to determine their relationship to dental fear and to utilization of the dentist. Dental fear was either the first or second most common fear, with a prevalence estimated between 183 and 226 persons per 1000 population. Dental fear was associated with fears of heights, flying, and enclosures. Respondents with multiple common fears other than fear of dentistry were more likely to delay or cancel dental appointments, report a longer period since their last visit to the dentist, and report poorer oral health and less satisfaction with oral appearance. Over 22 percent of the dentally fearful group reported two or more accompanying common fears.

  9. Attention deficit hyperactivity disorder and dental anxiety in adults: relationship with oral health.

    Science.gov (United States)

    Carlsson, Viktor; Hakeberg, Magnus; Blomkvist, Klas; Wide Boman, Ulla

    2013-06-01

    The aim of the present study was to investigate the presence of attention deficit hyperactivity disorder (ADHD) in adult patients with severe dental anxiety. Specifically, we analysed the relationship among ADHD, oral health, and dental anxiety. The World Health Organization Adult ADHD Self-Report Scale (ASRS) Screener was administered to a consecutive sample of patients referred to a dental fear research and treatment clinic. Patients completed questionnaires measuring dental anxiety (Dental Fear Survey) and self-rated oral health, and underwent a full radiographic examination. Of the total sample (n = 110), 16% scored above the established ASRS cut-off point, which is indicative of having ADHD. The ADHD group showed a higher level of dental anxiety and poorer self-rated oral health. There were also indications of poorer clinical oral health in the ADHD group, but these results did not reach statistical significance. In conclusion, the results of this study indicate an increased prevalence of ADHD in highly dentally anxious adults and the need to pay special attention to these patients because of greater treatment needs and increased dental anxiety. © 2013 Eur J Oral Sci.

  10. 基于CT断层影像的下颌骨及下牙列三维几何学仿真%3D Geometric Simulation of Mandible with Dental Arch from CT Data

    Institute of Scientific and Technical Information of China (English)

    李玲; 张睿; 于力牛; 张富强; 王成焘; 徐肖云

    2000-01-01

    进行基于CT断层影像的下颌骨及下牙列三维几何学仿真。方法结合牙CT技术,采用交互式人 机对话提取CT断层影像二维轮廓数据,应用美国PIC公司微机版Pro/Engineer和英国DELCAM公司POWERSHAPE 等应用软件建立下颌骨及下牙列三维线框模型和实体模型。结果得到了具有真实感的下颌骨及下牙列的三维实 体模型,该模型能够进行三维显示,模型可编辑性强。结论几何学仿真模型为快速原型和下颌骨及下牙列的力学 仿真模型等进一步应用和研究打下了基础。本文采用的几何学仿真方法切实可行,在口腔颌面外科、骨科等领域有 良好的应用前景。%A 3D geometric simulation of mandible with dental arch from CT has been obtained in this study. Meth ods This process uses automatic system assisted with interactive action to get 2D contour data from CT images, then 3D wireframe model and solid model were obtained by using CAD/CAM software Pro-E(USA) and DELC AM(UK).Results 3D solid model of mandible with dental arch were presented which can be fully edited. Conclusions This model can be applied to further educa tional and clinical researches such as RP , biomechanics simulation in prosthetic dentistry. The processes of simulation has wide applications in clinical practice of dentistry and dental education.

  11. Some insights for a relationship marketing model integrating SERVQUAL and customer loyalty in dental clinics

    OpenAIRE

    Vargas Perez, Ana Maria; Grijalvo Martin, Maria Mercedes; Mercado Idoeta, Carmelo

    2012-01-01

    The demand of new services, the emergence of new business models, insufficient innovation, underestimation of customer loyalty and reluctance to adopt new management are evidence of the deficiencies and the lack of research about the relations between patients and dental clinics. In this article we propose the structure of a model of Relationship Marketing (RM) in the dental clinic that integrates information from SERVQUAL, Customer Loyalty (CL) and activities of RM and combines the vision of...

  12. Comparative myology of the mandibular and hyoid arches of sharks of the order hexanchiformes and their bearing on its monophyly and phylogenetic relationships (Chondrichthyes: Elasmobranchii).

    Science.gov (United States)

    Soares, Mateus C; de Carvalho, Marcelo R

    2013-02-01

    The order Hexanchiformes currently comprises two families, Chlamydoselachidae (frilled sharks) and Hexanchidae (six- and seven-gill sharks), but its monophyly and relationships with other elasmobranchs are still discussed. Previous studies of hexanchiforms addressing these issues were based mainly on external morphology, teeth, skeletal features, and molecular data, whereas the employment of characters derived from variations in muscles has not been significantly explored. Dissections of four species of Hexanchiformes (including Chlamydoselachus anguineus) are reported here describing the mandibular (musculus adductor mandibulae dorsalis, m. adductor mandibulae ventralis, m. levator labii superioris, m. intermandibularis, and m. constrictor dorsalis) and hyoidean (m. constrictor hyoideus dorsalis and ventralis) arch muscles. Our results provide new data concerning the relationships of hexanchiforms to other elasmobranchs. The m. adductor mandibulae superficialis is described and illustrated in C. anguineus, contradicting previous accounts in which is was considered absent. The anteroposterior orientation of the m. adductor mandibulae superficialis in Chlamydoselachus is similar to the pattern found in hexanchids, squaloids, and hypnosqualeans (including batoids), suggesting it was secondarily lost in Echinorhinus. This muscle therefore provides further support for the inclusion of the Chlamydoselachidae and Hexanchidae in the Squalomorphi, and not basal to all other elasmobranchs or nested within an all-shark collective, as has been previously proposed. However, the m. adductor mandibulae superficialis originating at the jaw joint and with an aponeurotic insertion in hexanchids, squaliforms, and hypnosqualeans, may be a separate derived feature uniting these taxa. The insertion of the m. constrictor dorsalis is restricted to the postorbital articulation in hexanchids, whereas it extends farther anteriorly in C. anguineus. The insertion of the m. constrictor

  13. The relationship between panoramic indices and dental implant failure

    Energy Technology Data Exchange (ETDEWEB)

    Cho, Hyun Jung; Yi, Won Jin; Heo, Min Suk; Lee, Jin Koo; Lee, Sam Sun; Choi, Soon Chul [Seoul National University College of Medicine, Seoul (Korea, Republic of); An, Chang Hyeon [Kyungpook National University College of Medicine, Taegu (Korea, Republic of)

    2004-03-15

    Several panoramic indices have been suggested to assess bone quality from the morphology and width of mandibular cortex on panoramic radiography. The purpose of this study was to compare dental implant failure group with control group in panoramic mandibular index (PMI), mandibular cortical index (MCI), and gonion index (GI) and to determine the effect of these panoramic indices on dental implant failure. A case-control study was designed. Test group (n = 42) consisted of the patients who had their implants extracted because of peri-implantitis. Control group (n = 139) consisted of the patients who retained their implants over one year without any pathologic changes and had been followed up periodically. They had dental implants installed in their mandibles without bone augmentation surgery from 1991 to 2001. The following measures were collected for each patients: 1) PMI, MCI, and GI were measured twice at one-week interval on preoperative panoramic views; and 2) age, sex, implant length, implant type, installed location, occluding dentition state, and complication were investigated from the chart record. The PMI showed moderate level of repeatability. The intra-observer agreement of MCI and GI were good. There was statistically significant difference in PMI between two groups. There were significant different patterns of distribution of MCI and GI between two groups. Among the panoramic indices, PMI and MCI showed significant correlation with dental implant failure. Panoramic indices can be used as reference data in estimating bone quality of edentulous patients who are to have implants installed in their mandibles.

  14. Relationship between traumatic dental injuries and obesity in Brazilian schoolchildren.

    Science.gov (United States)

    Soriano, Evelyne Pessoa; Caldas, Arnaldo De França; De Carvalho, Marcus Vitor Diniz; Caldas, Kátia Urbano

    2009-10-01

    The aim of this study was to investigate if obesity is associated to the occurrence of dental trauma in the permanent anterior teeth of adolescents from Recife, Brazil. It included a random sample of 1046 boys and girls aged 12 years attending both public and private schools. The sample size was calculated using a 95% confidence interval level; a statistical significance of 5%; and an odds ratio of 1.55. The sample selection was carried out in two stages: first, schools were selected by simple sampling, and then children were chosen using a proportionality coefficient. Data were collected through clinical examinations and interviews, after examiner calibration. Dental trauma was classified according to ANDREASEN; ANDREASEN criteria. Obesity was considered according to National Center of Health Statistics - NCHS (USA) procedures for the assessment of nutritional status. Subjects were considered as non-obese when the observed percentile was 97. Data were summarized and analyzed using the statistical software SPSS. The prevalence of traumatic injuries was higher among obese boys than obese girls (17.2% and 16.2%, respectively), but there were no statistically significant differences between traumatic dental injuries and obesity (P > 0.05). It was concluded that the presence of obesity was not associated to traumatic dental injuries in adolescents from Recife, Brazil.

  15. Determinant factors of Yemeni maxillary arch dimensions

    Directory of Open Access Journals (Sweden)

    Nabil Muhsen Al-Zubair

    2015-01-01

    Conclusion: Measurements of palatal depth and relationships of the canines to one another and to other teeth thus had the widest ranges, implying that these dimensions are the strongest determinants of maxillary arch size.

  16. Measurement of width on labial keratinized gingiva of anterior dental arch of 120 Chinese Han-nationality youth%120名汉族青年前段牙弓唇侧角化龈宽度的测量

    Institute of Scientific and Technical Information of China (English)

    张艳玲; 张豪; 胡文杰; 孟焕新

    2010-01-01

    Objective To measure the width of keratinized gingiva and attached gingiva of anterior dental arch in order to establish reference guidance for periodontal surgery. Methods A total of 120 healthy Chinese Hart-nationality volunteers aged 20-30 years with healthy gingival tissue were recruited. The width of anterior labial dental arch, keratinized gingiva of gingival zenith, depth of gingival sulcus, and the width of coronal-apical keratinized gingiva of interdental papilla were measured respectively and the data were statistically analyzed. Results The width of keratinized gingiva and attached gingiva at gingival zenith varied for each individual and tooth location, ranging up to (5.6 ± 1.3) mm in the anterior maxillary region and (4. 5 ± 1.1 ) mm in the anterior submandibular region. The width decreased over the canine and first premolar and increased slightly over the second premolar. The width of keratinized gingiva at interdental papilla ranged from ( 6. 2 ± 1.3 ) mm to ( 8. 9 ± 1.4) mm in the maxilla and from ( 5. 8 ± 1.0 ) mm to (7.6 ±0. 9) mm in the mandible. The narrowest width of keratinized gingiva at interdental papilla was located over central incisors. Conclusions There is a variation of width on labial keratinized gingiva of anterior dental arch of Han nationality youth among different individuals and tooth locations.%目的 通过测量获取前段牙弓唇侧角化龈和附着龈宽度的相关数据,以期为牙周解剖和牙周手术提供参考.方法 选择20~30岁牙龈健康的汉族青年120人,分别测量前段牙弓唇侧龈缘高点处角化龈宽度及龈沟深度、邻间牙龈乳头尖端处冠根向角化龈宽度,并对数据进行统计学分析.结果 龈缘高点相应处角化龈宽度在上颌前段牙弓最宽可达(5.6±1.3)mm,在下颌前段牙弓最宽可达(4.5±1.1)mm,且以切牙区最宽,尖牙、第一前磨牙其宽度逐渐变窄,第二前磨牙开始增宽;上、下颌前段牙弓邻间牙龈乳头尖端相

  17. Study on the changes of dental arches used Nickel titanium flat wire in extraction crowding cases%排牙初期弓丝对牙弓形态和咬合维持作用的对比研究

    Institute of Scientific and Technical Information of China (English)

    杨艳; 陈启锋

    2014-01-01

    Objective Applicating nickel titanium flat and round wire in low fangs extraction crowding cases.Researching the influence of dental arch and the occlusion. Methods 40 cases were divided into flat and round wire groups.they were low fangs crowding cases of class Ⅰ Osseous neutronclusion,extracted four first premolars, treated by nickel titanium flat and round wire and active-wing appliance.low fangs were neaarranged.Study model were analysed before and after treatment. The measurement data had statistical analysis,the effect were observed of dental arch width and length. Results Flat wire group:widths of maxillary canines decreased,The upper second bicuspid increased,The upper molar had no change.The distance maxillary incisor and molar to palatal wrinkle had no change.round wire groups:widths of maxillary canines decreased,the upper second bicuspid and upper molar increased. The distance maxillary incisor to palatal wrinkle increased.the distance molar to palatal wrinkle had no change. Conclusion Nickel titanium flat wire and activewing appliance can treat low fangs extraction crowding cases.That can adjust the morphology of dental arch,preserve the stability of functional occlusal plane,Control the incisor protrusion.reduce the new teratogenesis,decrease the speed of orthodontic treatment,short the period of treatment,Clinical curative effect is good.%目的:应用镍钛圆丝和带状弓丝作用在低位尖牙的拥挤拔牙病例上,研究带状镍钛弓丝对尖牙拥挤病例的牙弓形态和咬合的影响。方法:选择40例骨性Ⅰ类错牙合、上颌尖牙低位拥挤病例。随机分为带状弓丝组和圆丝组,拔除4颗第一前磨牙,应用带状弓丝、圆丝和活动翼矫治技术进行治疗。尖牙排齐后,对治疗前后的记存模型进行分析,观察带状弓丝对牙弓宽度和牙弓长度的影响。结果:带状弓丝组:治疗后上颌尖牙的宽度有所减小,第二前磨牙宽度有所增大,第

  18. Establishing a good dentist-patient relationship: skills defined from the dental faculty perspective.

    Science.gov (United States)

    Orsini, Cesar A; Jerez, Oscar M

    2014-10-01

    The importance of developing good dentist-patient relationships has been well documented, but previous studies have focused on social techniques, not considering the psychological and behavioral characteristics of patients, and have used definitions and instruments that were not dental-specific. Therefore, the aims of this study were to propose a definition of dentist-patient relationship skills, derived from dental faculty members' criteria and informed by Emotional Intelligence concepts, and to propose a preliminary dental-specific, face-valid, and reliable self-assessment instrument. The study was conducted in three phases. Phases I and II defined dentist-patient relationship competence through literature analysis and semi-structured interviews with expert key informants, establishing the outcome skills. In Phase III, the instrument was constructed and piloted. Communication skills and basic psychological tools resulted in core topics for use in practice. The definition both specifies and broadens social interactions in dentistry by including dental faculty members' criteria and topics such as psychological tools and pre-, intra-, and postoperative topics appropriate for use during consultation, examination, and treatment. The instrument was found suitable, reasonable, and accessible with a Cronbach's alpha level of 0.95. Future studies are needed to confirm the definition, as well as the instrument's validity, reliability, transference, and sensitivity to the dental educational environment.

  19. Clinical and radiological 12-year follow-up of full arch maxilla prosthetic restoration supported by dental implants positioned through guide flapless surgery.

    Science.gov (United States)

    Soardi, C M; Bramanti, E; Cicciù, M

    2014-03-01

    The computer-guided flapless surgery for implant placement using stereolithographic templates is going to be considered a daily practice technique. The advantages of this kind of surgery are related with its no flap opening, with the precision of the implant positioning and with the possibility of having a quick rehabilitation and low post-surgical discomfort. The introduction of digital planning programs has made it possible to place dental implants in preplanned positions and being immediately functionally loaded by using prefabricated prostheses. This case presented a 12-year follow-up of a maxillary prosthesis supported by dental implant immediately loading and positioned with the first kind of guided flapless surgery technique. Aim of this paper was to report how the guide surgery implant position technique can be considered a predictable and safe technique giving the surgeon excellent long-term results.

  20. TO STUDY THE RELATIONSHIP BETWEEN PREGNANCY, GINGIVITIS, DENTAL CARIES AND PERIODONTAL DISEASE

    Directory of Open Access Journals (Sweden)

    Bhavana

    2014-03-01

    Full Text Available The pregnancy is associated with profound dental biological processes as a result of hormonal interactions within the mother’s body, which result in both reversible and irreversible dental changes. The periodontal disease is associated with adverse pregnancy outcome. Increased public awareness, health education and medical intervention can improve the maternal and fetal outcome. The cohort study was carried out in the department of obstetrics and gynecology at Integral institute of medical sciences and research, Lucknow from January 2012 to February 2014, for the period of 2 year. The objective was to study the relationship between pregnancy, gingivitis, dental caries and periodontal disease. METHODS: The cohort study was carried out in the department of obstetrics and gynecology at Integral institute of medical sciences and research, Lucknow from January 2012 to February 2014, for the period of 2 year. The dental health status of 1200 antenatal cases were studied. The prevalence of gingivitis, dental caries and periodontal disease and the relationship with pregnancy was studied. RESULT: The oral hygiene was a significant determining factor in the disease process. The antenatal cases with poor oral hygiene were 2.5 times more likely to have dental caries. OR 0.0138, 95% CI (0.0033 to 0.0570 Z statistic 5.908, P<0.0001.The antenatal cases with poor oral hygiene were 20times more likely to have gingivitis. OR 0.0045, 95% CI (0.0006-0.0365 Z statistic 5.077, P<0.0001. In the study the prevalence of dental caries, gingivitis and periodontal disease were 90%, 98% and 90.33% respectively. The oral disease process was characteristically noticed in the second trimester and/or pre-existing disease got aggravated in the second trimester

  1. The relationship between parenting, family interaction and childhood dental caries: a case-control study

    NARCIS (Netherlands)

    M. de Jong-Lenters; D. Duijster; M.A. Bruist; J. Thijssen; C. de Ruiter

    2014-01-01

    The aim of this case-control study was to explore the relationship between parenting practices, parent-child interaction and childhood dental caries, using a sample of 5-8-year old children from the Netherlands. Cases were defined as children with four or more decayed, missing or filled teeth and co

  2. Collaborative Relationships in Dental Materials Research: Measuring the Volume and Outcomes.

    Science.gov (United States)

    Garrison, Howard H.; And Others

    1992-01-01

    Collaborative relationships between researchers and resources from government, industry, and academia were studied through a survey of research into dental materials. The outcomes of research conducted under various arrangements by 386 targeted respondents were reviewed. Implications of the high rate of collaboration for both industry and academia…

  3. The relationship between parenting, family interaction and childhood dental caries: A case-control study

    NARCIS (Netherlands)

    Jong-Lenters, M. de; Duijster, D.; Bruist, M.A.; Thijssen, J.; Ruiter, C. de

    2014-01-01

    The aim of this case-control study was to explore the relationship between parenting practices, parent-child interaction and childhood dental caries, using a sample of 5-8-year old children from the Netherlands. Cases were defined as children with four or more decayed, missing or filled teeth and co

  4. The Relationship between Sugar-Containing Methadone and Dental Caries: A Systematic Review

    Science.gov (United States)

    Tripathee, Sheela; Akbar, Tahira; Richards, Derek; Themessl-Huber, Markus; Freeman, Ruth

    2013-01-01

    Objectives: To review the evidence of a relationship between sugar-containing methadone and dental caries. Data sources: A systematic search of Cochrane Library, PubMed, PsychINFO, EMBASE, MEDLINE, Current Controlled Trials, WHO, OHRN, SIGLE and ERIC databases was conducted from January 1978 up to June 2010. Study selection: Articles were assessed…

  5. The Relationship between Sugar-Containing Methadone and Dental Caries: A Systematic Review

    Science.gov (United States)

    Tripathee, Sheela; Akbar, Tahira; Richards, Derek; Themessl-Huber, Markus; Freeman, Ruth

    2013-01-01

    Objectives: To review the evidence of a relationship between sugar-containing methadone and dental caries. Data sources: A systematic search of Cochrane Library, PubMed, PsychINFO, EMBASE, MEDLINE, Current Controlled Trials, WHO, OHRN, SIGLE and ERIC databases was conducted from January 1978 up to June 2010. Study selection: Articles were assessed…

  6. The relationship between parenting, family interaction and childhood dental caries: A case-control study

    NARCIS (Netherlands)

    Jong-Lenters, M. de; Duijster, D.; Bruist, M.A.; Thijssen, J.; Ruiter, C. de

    2014-01-01

    The aim of this case-control study was to explore the relationship between parenting practices, parent-child interaction and childhood dental caries, using a sample of 5-8-year old children from the Netherlands. Cases were defined as children with four or more decayed, missing or filled teeth and co

  7. The relationship between parenting, family interaction and childhood dental caries: A case-control study

    NARCIS (Netherlands)

    Jong-Lenters, M. de; Duijster, D.; Bruist, M.A.; Thijssen, J.; Ruiter, C. de

    2014-01-01

    The aim of this case-control study was to explore the relationship between parenting practices, parent-child interaction and childhood dental caries, using a sample of 5-8-year old children from the Netherlands. Cases were defined as children with four or more decayed, missing or filled teeth and

  8. Evaluation of the Relationship between Salivary Albumin Level and Dental Caries

    Directory of Open Access Journals (Sweden)

    H. Abdolsamadi

    2013-07-01

    Full Text Available Introduction & Objective: Recently, it has been suggested that there might be an association between oral diseases such as dental caries, as well as periodontitis and general health . Re-garding the fact that albumin is an indicator of general health, the aim of the present study was to evaluate the relationship of salivary albumin concentration with dental caries. Materials & Methods: In this descriptive-analytical study 108 patients aged 13-19 years old who had teeth caries were placed in 3 groups with mild, moderate and severe dental caries according to their DMFT value (n=36. Five ml of unstimulated saliva were taken from each participant via Navazesh method and their albumin concentrations were assessed by nephelometery method. Data were analyzed by t-test and ANOVA. Results: The mean concentration of salivary albumin in three experimental groups was 84.442±42.915, 97.964±66.717 and 89.850±33.003, respectively. ANOVA showed that the difference among the mean values was not significant (P=0.09 but the relationship between salivary albumins and sex was significant (P=0.009. Conclusion: According to the results of the present study there was no significant relationship between albumin and dental caries in 13-19 year old individuals. (Sci J Hamadan Univ Med Sci 2013; 20 (2:101-106

  9. Comparison between different plantar arch

    OpenAIRE

    2009-01-01

    The longitudinal plantar arch (LPA) perform biomechanics functions in the foot. The aim of this study was to compare the relationship between different index to measure the LPA of the foot. The arc index, Staheli index, Viladot classification and Feiss line were compared. In the transversal study, the experimental samples were soccer players females with age between 13 to 19 years. The measure were performed by plantigraphy, with out Feiss line. Although non significant the higher agreement w...

  10. Relationship between dental anomalies and orthodontic root resorption of upper incisors.

    Science.gov (United States)

    Van Parys, Katrien; Aartman, Irene H A; Kuitert, Reinder; Zentner, Andrej

    2012-10-01

    The aim of this study was to examine the potential relationship between the occurrence of orthodontic root resorption and presence of dental anomalies such as tooth agenesis and pipette-shaped roots. Dental anomalies and root resorption were assessed on dental panoramic tomographs (DPT) of 88 subjects, 27 males and 61 females, mean age 28.4 (SD = 11.3 years), selected from orthodontic patients on the basis of the following exclusion criteria: previous fixed appliance treatment, bad quality of the DPTs and no visibility of the periodontal ligament of every tooth, and younger than 15 years of age at the onset of treatment with fixed edgewise appliance lasting at least 18 months. A pipette-shaped root was identified as defined by a drawing. Tooth agenesis was assessed on DPTs and from subjects' dental history. Root resorption was calculated as the difference between the root length before and after treatment, with and without a correction factor (crown length post-treatment/crown length pre-treatment). If one of the four upper incisors showed root resorption of ≥2.3 mm with both formulas, the patient was scored as having root resorption. Chi-square tests indicated that there was no relationship between orthodontic root resorption and agenesis (P = 0.885) nor between orthodontic root resorption and pipette-shaped roots (P = 0.800). There was no relationship between having one of the anomalies and root resorption either (P = 0.750). In the present study, it was not possible to confirm on DPTs a relationship between orthodontic root resorption and dental anomalies, such as agenesis and pipette-shaped roots.

  11. What is the relationship between emotional intelligence and dental student clinical performance?

    Science.gov (United States)

    Victoroff, Kristin Zakariasen; Boyatzis, Richard E

    2013-04-01

    Emotional intelligence has emerged as a key factor in differentiating average from outstanding performers in managerial and leadership positions across multiple business settings, but relatively few studies have examined the role of emotional intelligence in the health care professions. The purpose of this study was to examine the relationship between emotional intelligence (EI) and dental student clinical performance. All third- and fourth-year students at a single U.S. dental school were invited to participate. Participation rate was 74 percent (100/136). Dental students' EI was assessed using the Emotional Competence Inventory-University version (ECI-U), a seventy-two-item, 360-degree questionnaire completed by both self and other raters. The ECI-U measured twenty-two EI competencies grouped into four clusters (Self-Awareness, Self-Management, Social Awareness, and Relationship Management). Clinical performance was assessed using the mean grade assigned by clinical preceptors. This grade represents an overall assessment of a student's clinical performance including diagnostic and treatment planning skills, time utilization, preparation and organization, fundamental knowledge, technical skills, self-evaluation, professionalism, and patient management. Additional variables were didactic grade point average (GPA) in Years 1 and 2, preclinical GPA in Years 1 and 2, Dental Admission Test academic average and Perceptual Ability Test scores, year of study, age, and gender. Multiple linear regression analyses were conducted. The Self-Management cluster of competencies (b=0.448, pManagement competencies were emotional self-control, achievement orientation, initiative, trustworthiness, conscientiousness, adaptability, and optimism. In this sample, dental students' EI competencies related to Self-Management were significant predictors of mean clinical grade assigned by preceptors. Emotional intelligence may be an important predictor of clinical performance, which has

  12. Three-dimensional analysis of dental and dental arch changes in maxillary crowding patients treated with self-ligating brackets%自锁托槽解除上颌牙列拥挤后牙弓与牙齿的三维变化研究

    Institute of Scientific and Technical Information of China (English)

    陈上; 厉松

    2016-01-01

    Objective The purpose of this study was to evaluate the three dimensional changes of dental and dental arch after self-ligating treatment.Methods 16 Angle Class Ⅰ patients with moderate crowding were treated with DamonQ self-ligating brackets.The before and after CBCT records were analyzed by Amira ResolveRT software.Results Basal bone widths,alveolar widths and cusp widths were expanded with greater changes in anterior arch segment.Good correlation was found between the changes of basal bone widths and alveolar widths.The tooth inclinations were observed with various degrees except the first molars.Conclusions The anterior basal bone widths were expanded after self-ligating treatment,while the widths of posterior arch were maintained.The alveolar bone widths expansion builds on basal bone widths change.Self-ligating system could expand the arch widths by compensatory teeth inclination in patients with narrow basal bone arch.%目的 探讨自锁托槽解除牙列拥挤后牙弓与牙齿的三维变化.方法 通过DamonQ自锁托槽系统对16例安氏Ⅰ类中度拥挤患者行不拔牙矫治,在上颌牙列排齐前后分别拍摄CBCT,运用Amira ResolveRT软件进行三维重建并测量牙弓和牙齿的三维变化.结果 运用自锁托槽系统排齐后,上颌的基骨弓宽度、牙槽嵴宽度和牙尖宽度有不同程度的增宽,牙弓前段的增宽量大于牙弓后段;牙槽部的宽度与基骨弓的宽度相关性较高;除第一磨牙外,上颌牙齿均发生不同程度颊倾.结论 在牙弓前段,自锁托槽可能体现出少量基骨弓扩大的效果,越靠近牙弓后段,基骨弓的宽度基本维持;牙槽部宽度的变化以基骨弓的宽度为基础,对于牙槽部较窄的个体,自锁托槽系统可能将通过牙齿的倾斜代偿使牙弓宽度在一定程度上增加.

  13. Comparison of overjet among 3 arch types in normal occlusion.

    Science.gov (United States)

    Kim, Byung-In; Bayome, Mohamed; Kim, Yoonji; Baek, Seung-Hak; Han, Seong Ho; Kim, Seong-Hun; Kook, Yoon-Ah

    2011-03-01

    The purposes of this study were to examine the amounts of overjet in the anterior and posterior segments of 3 arch forms by using facial axis points on 3-dimensional virtual models and to verify the minimum posterior extension required for classification of the arch form in normal occlusions. Facial axis points were digitized on 97 virtual models with normal occlusion, classified into 20 tapered, 25 ovoid, and 52 square arch forms. Intercanine and intermolar arch widths and depths were measured. The best-fitting curves were created, and overjet was measured at each facial axis point. Two-way analysis of variance (ANOVA) was performed to assess the relationship between arch form and overjet in different areas. The minimum posterior extension to determine arch type was analyzed with the chi-square test. Subjects with a tapered arch form had larger overjet compared with those with ovoid and square forms, except at the central incisor. A significant difference in overjet among different areas was found in subjects with a square arch form (P overjet according to arch types. The extension to the first premolar was sufficient to classify arch form type. It might be beneficial to consider more coordinated preformed superelastic archwires according to variations in overjet of different arch types. Copyright © 2011 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.

  14. Relationship between cardiovascular disease and dental pathology. Systematic review.

    Science.gov (United States)

    González Navarro, Beatriz; Pintó Sala, Xavier; Jané Salas, Enric

    2017-09-08

    The relationship between atherothrombotic cardiovascular disease (ATCD) and localised infections in teeth, including caries and chronic apical periodontitis (CAP) has not been studied much and is not well defined. A systematic search was performed using the scientific databases PubMed and Medline from 1989 to 2016. A significant relationship was observed with ATCD in 10 out of 10 studies addressing the degree of oral hygiene, in 14 of 17 that included loss of teeth, in 6 of 12 that analysed caries and in 11 of 15 that included CAP. However, there was a huge methodological heterogeneity. It can be concluded that there is an association between CAP and ATCD. Patients with ATCD present a worse oral hygiene status and fewer teeth. Copyright © 2017 Elsevier España, S.L.U. All rights reserved.

  15. The Relationship of Orthodontic Treatment Need with Periodontal Status, Dental Caries, and Sociodemographic Factors

    OpenAIRE

    Ruhi Nalcaci; Serhat Demirer; Firat Ozturk; Altan, Burcu A.; Oral Sokucu; Vildan Bostanci

    2012-01-01

    The aim of this study was to determine the relationship of orthodontic malocclusion with periodontal status, dental caries, and sociodemographic status. Our study population consisted of a sample of 836 school children (384 male and 452 female, aged 11–14 years). Four experienced orthodontists and two experienced periodontists performed the clinical examinations. The Treatment Priority Index (TPI), Community Periodontal Index of Treatment Needs (CPITN), decayed, missing, filled teeth (DMFT) s...

  16. The relationship between parenting, family interaction and childhood dental caries: a case-control study.

    Science.gov (United States)

    de Jong-Lenters, M; Duijster, D; Bruist, M A; Thijssen, J; de Ruiter, C

    2014-09-01

    The aim of this case-control study was to explore the relationship between parenting practices, parent-child interaction and childhood dental caries, using a sample of 5-8-year old children from the Netherlands. Cases were defined as children with four or more decayed, missing or filled teeth and controls were caries free. Cases (n = 28) and controls (n = 26) were recruited from a referral centre for paediatric dental care and a general dental practice, respectively. Parenting practices and parent-child interactions of the child's primary caregiver were observed using Structured Interaction Tasks and subsequently rated on seven dimensions: positive involvement, encouragement, problem-solving, discipline, monitoring, coercion and interpersonal atmosphere. All Structured Interaction Tasks were videotaped, and coded by trained and calibrated observers blind to the dental condition. Differences in parenting dimensions between cases and controls were analysed using multivariate analysis of variance, independent samples T-tests, χ(2)-tests and multiple logistic regression analyses. Controls had significantly higher scores on the dimensions positive involvement, encouragement, problem-solving and interpersonal atmosphere, compared to cases. Parents of controls were also less likely to show coercive behaviours. These associations remained statistically significant after adjustment for the mother's education level, tooth brushing frequency and the frequency of consuming sugary foods and drinks, except for coercion. There was no significant difference in discipline between cases and controls. In conclusion, this case-control study found a significant relationship between parenting practices, parent-child interaction quality and childhood dental caries. Our findings suggest that parenting practices may be an important factor to consider in caries preventive programs. Copyright © 2014 Elsevier Ltd. All rights reserved.

  17. Investigating the Relationship between Mental Health and Academic Achievement of Dental Students of Ahvaz Jundishapur University of Medical Sciences

    National Research Council Canada - National Science Library

    Abdolreza Gilavand; Mohammad Shooriabi

    2016-01-01

    .... So, this research has been performed aiming at investigation of the relationship between mental health and academic achievement of dental students of Ahvaz Jundishapur University of Medical Sciences (AJUMS...

  18. Relationship between knowledge, attitude, behavior, and self-efficacy on the radiation safety on dental hygienist

    Energy Technology Data Exchange (ETDEWEB)

    Han, Eun Ok; Jun, Sung Hee [Daegu Health College, Daegu (Korea, Republic of)

    2008-11-15

    The objective of this study is to draw an educational plant for reducing the probability of troubles caused by radiation for dental hygienists who are the major applicants of radiation equipments used in dental offices. This study investigated the knowledge and self-efficacy, which is the major variable that affects the attitude and behavior, on the radiation safety that is an educational approach. Also, this study obtained following results from a survey for 25 days from June 15, 2008 that was applied for 225 dental hygienists worked at dental offices and clinics in the area of Youngnam in order to verify the relationship between such variables. The average scores for the knowledge, attitude, and behavior were 54.28±16.33, 87.93±9.75, and 59.85±14.76, respectively. Also, the average score of the self-efficacy was 72.88±8.60. In the knowledge level for the radiation safety, ‘a case that prepares personal dosimeters’, ‘a case that establishes protection facilities’, ‘a case that presents 6⁓10 dental hygienists’, ‘a case that presents radiological technologists’, and ‘a case that is a general hospital’ represented high values. In the attitude level for the radiation safety, ‘a case who is a married person’, ‘a case that prepares personal dosimeters’, and ‘a case that is a general hospital’ showed high values. In the behavior level for the radiation safety, ‘a case that shows a career in dental hygienist or radiographic for 6⁓10 years’, ‘a case that attends radiation safety education’, ‘a case that establishes protection facilities’ showed high values. Also, in the self-efficacy level, ‘a case that who has a high education level more than graduate school education’ and ‘a case that establishes protection facilities’ represented high values. In the relationship between the knowledge, attitude, behavior, and self-efficacy for the radiation safety, it showed statistically significant differences in this

  19. Test anxiety. Relationship to academic and clinical performance in dental hygiene students.

    Science.gov (United States)

    Rich, S K

    1991-10-01

    This study investigated the relationship of test anxiety, study skills, aptitude, and prior GPA to academic and clinical performance in junior and senior dental hygiene students. Eighty-nine volunteer subjects completed a test anxiety scale (TAS) and an effective study test (EST) at the beginning of the spring semester. Prior grade point average (GPA) and dental hygiene candidate aptitude (DHCAT) scores were obtained, and the relationships of all variables to spring GPA and spring clinic grade were analyzed. TAS showed significant, but weak, inverse relationships with prior GPA (r = -.24, p less than .05) and spring GPA (r = -.29, p less than .01). Verbal, science, and reading comprehension subscales of the DHCAT were significantly and moderately associated with spring GPA. In a hierarchical/stepwise regression analysis. TAS did not explain any of the variance in academic or clinical performance. Study skills explained 3% of the variance in spring GPA and 6% of the variance in spring clinic grade. Prior GPA was identified as the strongest predictor of academic performance in the dental hygiene program as it explained 44% of the variance in overall spring GPA. None of the variables studied emerged as a strong predictor of clinical performance.

  20. Relationship between squamous cell carcinoma of the tongue and the position of dental prosthesis.

    Science.gov (United States)

    Fan, Huan; Yoon, Ki-Yong; Kim, Soung-Min; Myoung, Hoon; Lee, Jong-Ho; Kim, Myung-Jin

    2015-04-01

    Squamous cell carcinoma (SCC) of the tongue has a relatively high incidence of all oral cancers. Some studies have reported a relationship between intraoral dental prosthesis and SCC of the tongue; however, this relationship remains controversial. The purpose of this study was to investigate the relationship between SCC of the tongue and the positional aspects of dental prosthesis using a retrospective analysis. A total of 439 patients with SCC of the tongue were diagnosed and treated in the Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital. Patients were treated over a 12.5-year period ranging from January 1, 2001 to June 30, 2013. Statistical analysis was performed to examine potential differences between the groups. The number of patients with a crown and/or a bridge (134, 63.5%) was significantly different than the number of patients without a prosthesis (77, 36.5%). Even after accounting for different types of prostheses such as crowns, bridges, and dentures, no significant differences were observed between the position of the prosthesis and the location of the SCC of the tongue, with significance defined as a P-value less than .05 by the Pearson-Chi square test. Patients with crowns and/or bridges exhibited more frequent SCC of the tongue compared with patients without these prosthesis. These data support the hypothesis that mechanical trauma and galvanic phenomena play a role in the etiology of SCC of the tongue.

  1. The Ultrastructural Relationship Between Osteocytes and Dental Implants Following Osseointegration.

    Science.gov (United States)

    Du, Zhibin; Ivanovski, Saso; Hamlet, Stephen M; Feng, Jian Q; Xiao, Yin

    2016-04-01

    Osteocytes, the most abundant cells in bone, have multiple functions, including acting as mechanosensors and regulating mineralization. It is clear that osteocytes influence bone remodeling by controlling the differentiation and activity of osteoblasts and osteoclasts. Determining the relationship between titanium implants and osteocytes may therefore benefit our understanding of the process of osseointegration. The aim of this study was to visualize the ultrastructural relationship between osteocytes and the titanium implant surface following osseointegration in vivo. Titanium implants were placed in the maxillary molar regions of eight female Sprague Dawley rats, 3 months old. The animals were sacrificed 8 weeks after implantation, and undecalcified tissue sections were prepared. Resin-cast samples were subsequently acid-etched with 37% phosphoric acid prior to examination using scanning electron microscopy. Compared with mature bone, where the osteocytes were arranged in an ordered fashion, the osteocytes appeared less organized in the newly formed bone around the titanium implant. Further, a layer of mineralization with few organic components was observed on the implant surface. This study shows for the first time that osteocytes and their dendrites are directly connected with the implant surface. This study shows the direct anchorage of osteocytes via dendritic processes to a titanium implant surface in vivo. This suggests an important regulatory role for osteocytes and their lacunar-canalicular network in maintaining long-term osseointegration. © 2014 Wiley Periodicals, Inc.

  2. Arch Index: An Easier Approach for Arch Height (A Regression Analysis

    Directory of Open Access Journals (Sweden)

    Hironmoy Roy

    2012-04-01

    Full Text Available Background: Arch-height estimation though practiced usually in supine posture; is neither correct nor scientific as referred in literature, which favour for standing x-rays or arch-index as yardstick. In fact the standing x-rays can be excused for being troublesome in busy OPD, but an ink-footprint on simple graph-sheet can be documented, as it is easier, cheaper and requires almost no machineries and expertisation. Objective: So this study aimed to redefine the inter-relationship of the radiological standing arch-heights with the arch-index for correlation and regression so that from the later we can derive the radiographical standing arch-height values indirectly, avoiding the actual maneuver. Methods: The study involved 103 adult subjects attending at a tertiary care hospital of North Bengal. From the standing x-rays of foot, the standing navicular, talar heights were measured, and ‘normalised’ with the foot length. In parallel foot-prints also been obtained for arch-index. Finally variables analysed by SPSS software. Result: The arch-index showed significant negative correlations and simple linear regressions with standing navicular height, standing talar height as well as standing normalised navicular and talar heights analysed in both sexes separately with supporting mathematical equations. Conclusion: To measure the standing arch-height in a busy OPD, it is wise to have the foot-print first. Arch-index once get known, can be put in the equations as derived here, to predict the preferred standing arch-heights in either sex.

  3. The knowledge level of dental surgeons regarding the relationship between occlusal factors and Temporomandibular Disorders (TMD

    Directory of Open Access Journals (Sweden)

    Jefferson Filippo Castro de ASSIS

    Full Text Available AbstractIntroductionThe relationship between dental occlusion and temporomandibular disorders (TMD remains a subject of disagreement. Many professionals erroneously base diagnosis and treatment strictly on the occlusal factor, despite the fact that current scientific evidence does not show such a relationship.ObjectiveTo evaluate the knowledge of dental surgeons (DSs from João Pessoa (PB-Brazil, regarding the relationship between occlusal factors and TMD.Materials and methodA sample of 100 DSs who do not have expertise in TMD and orofacial pain (CG Group and seven DSs with this specialty (EG Group completed a questionnaire that addresses issues concerning knowledge of TMD and its relationship with occlusal factors. The questionnaire also contained information used to characterize the sample, such as age, gender, and length of experience. The current literature's degree of consensus was established as the "gold standard" response for each statement and was compared with the responses of the specialists and non-specialists. Data were tabulated using the SPSS software package and analyzed descriptively (by percentage and statistically using the chi-square and Fisher's exact tests (p < 0.05.ResultA wide divergence could be observed between the knowledge of DSs who do not specialize in TMD and orofacial pain and that of professionals who do.ConclusionThere was low agreement between specialists and non-specialists. The relationship between dental occlusion and TMD remains unclear for the vast majority of participating professionals, which may prove to be reflected in diagnostic behaviors and inappropriate occlusal treatment for the management of TMD.

  4. Relationship between dental caries and metabolic syndrome among 13 998 middle-aged urban Chinese.

    Science.gov (United States)

    Cao, Xia; Wang, Dongliang; Zhou, Jiansong; Yuan, Hong; Chen, Zhiheng

    2017-04-01

    The association between dental caries and metabolic syndrome (MetS) is inconsistent. The aim of the present study was to assess the relationship between dental caries and MetS and its components in a middle-aged Chinese population. A cross-sectional analysis was performed of 13 998 participants aged 45-65 years undergoing a health check during 2013-14. An index variable of decayed, missing, and filled teeth (DMFT) was calculated. Logistic regression was used to estimate odds ratios (ORs) and 95 % confidence intervals (CIs) after adjustment for sex, age, education level, dietary habits, alcohol use, smoking, physical activity, and periodontitis. Of the 13 998 participants, 6164 had dental caries and 7834 did not; 3571 had MetS, whereas 10 427 did not. Participants with severe caries showed a higher prevalence of MetS, abdominal obesity, elevated blood pressure, dyslipidemia, and hyperglycemia than those with mild or no caries (all P dental caries and those with two or more DMFT were 1.12 (95 % CI 1.14-1.74) and 1.09 (95 % CI, 0.89-1.21), respectively (P trend  caries were associated with MetS among subjects with hyperglycemia (OR 1.14 [95%CI, 0.98-1.34]; P caries and abdominal obesity, hypertriglyceridemia, low high-density lipoprotein cholesterol, and elevated blood pressure (adjusted ORs [95 % CIs] 0.98 [0.82-1.16], 1.01 [0.85-1.19], 0.84 [0.70-1.00], and 0.96 [0.86-1.13], respectively; all P > 0.05). Dental caries were associated with MetS among middle-aged Chinese in the present study. © 2016 Ruijin Hospital, Shanghai Jiaotong University School of Medicine and John Wiley & Sons Australia, Ltd.

  5. Full-arch dental implant restorationversussectional repair for dentulous mandible%种植支持全牙弓和分段式修复无牙颌患者的对比

    Institute of Scientific and Technical Information of China (English)

    覃太平

    2015-01-01

    背景:临床对于无牙颌骨患者主要采用种植支持全牙弓和分段式修复,这两种治疗方案各有特点,种植支持全牙弓修复有利于种植体及下颌骨的保护,但对修复体不利;分段式修复对修复体更有利。目的:对比种植支持全牙弓和分段式修复无牙颌患者的临床效果和患者满意度。方法:纳入实施无牙颌种植支持式义齿修复治疗的患者40例,其中28例采用全牙弓式修复,12例采用分段式修复,两组全部采用百康特种植系统及配套的种植体,种植修复完成后对患者进行1年的随访,采用临床检查、X射线评价种植体和骨组织结合成功率。结果与结论:全牙弓式修复组种植成功率为100%,分段式修复组种植成功率为98%,两组间比较差异无显著性意义;全牙弓式修复组修复成功率为97%,分段式修复组修复成功率为98%,两组间比较差异无显著性意义;两组种植后三四个月及修复完成后12个月的骨吸收情况无差异;两组患者对种植义齿的咀嚼功能恢复、固定效果、主观舒适度、发音均比较满意,组间比较差异无显著性意义(P>0.05),但全牙弓式修复组的美观评价、维护方便性及总满意度明显高于分段式修复组(P 0.05). The successful restoration rates were 96.5% and 98% in the two groups, respectively, with no significant difference (P > 0.05). Bone resorption showed no difference between the two groups at 3-4 months after implantation or at 12 months after restoration. Patients in the two groups were al satisfied with masticatory function, fixed effect, subjective comfort and pronunciation are satisfactory, and there was no statisticaly significant difference (P > 0.05). However, beautiful evaluation, maintenance convenience and total satisfaction were significantly higher in the ful-arch group than the sectional repair group (P < 0.05). These findings suggest that both ful-arch

  6. Relationship between Child and Parental Dental Anxiety with Child's Psychological Functioning and Behavior during the Administration of Local Anesthesia.

    Science.gov (United States)

    Vasiliki, Boka; Konstantinos, Arapostathis; Nikolaos, Kotsanos; Vassilis, Karagiannis; Cor, van Loveren; Jaap, Veerkamp

    The aims of this study were to determine: 1) the relationship between children's psychological functioning, dental anxiety and cooperative behavior before and during local anesthesia, 2) the relationship of parental dental anxiety with all the above child characteristics. There was a convenient sample of 100 children (4-12 years). Child dental anxiety and psychological functioning were measured using the "Children's Fear Survey Schedule" (CFSS-DS) and the "Strengths and Difficulties Questionnaire" (SDQ) respectively. Parental dental anxiety was measured using the "Modified Dental Anxiety Scale" (MDAS). All questionnaires were completed by parents. Before and during local anesthesia, the child behavior was scored by one experienced examiner, using the Venham scale. Non-parametric tests and correlations (Mann-Whitney, Spearman's rho) were used for the analysis. The mean SDQ score was 10±5.6 for boys (n=60) and 8.3±4.8 for girls (n=40) (p=0.038), but there was no correlation with children's age. The mean CFSS-DS score was 33.1±11.86 and there was no correlation with age or gender. Children with higher levels in the pro-social subscale of the SDQ had significantly less anxiety and better behavior before local anesthesia. Higher mean CFSS-DS scores were significantly associated with uncooperative behavior during local anesthesia (p=0.04). There was no correlation between parents' and their children's dental anxiety, psychological functioning and behavior. 46% of the children had previous dental experience in the last 6 months. As time since the last dental treatment increased, an improvement was found in children's behavior during local anesthesia. Child psychological functioning was related to dental anxiety and behavior during dental appointment involving local anesthesia.

  7. A significant dose-dependent relationship between mercury exposure from dental amalgams and kidney integrity biomarkers: a further assessment of the Casa Pia children's dental amalgam trial.

    Science.gov (United States)

    Geier, D A; Carmody, T; Kern, J K; King, P G; Geier, M R

    2013-04-01

    Dental amalgams are a commonly used dental restorative material. Amalgams are about 50% mercury (Hg), and Hg is known to significantly accumulate in the kidney. It was hypothesized that because Hg accumulates in the proximal tubules (PTs), glutathione-S-transferases (GST)-α (suggestive of kidney damage at the level of PT) would be expected to be more related to Hg exposure than GST-π (suggestive of kidney damage at the level of the distal tubules). Urinary biomarkers of kidney integrity were examined in children of 8-18 years old, with and without dental amalgam fillings, from a completed clinical trial (parent study). Our study determined whether there was a significant dose-dependent correlation between increasing Hg exposure from dental amalgams and GST-α and GST-π as biomarkers of kidney integrity. Overall, the present study, using a different and more sensitive statistical model than the parent study, revealed a statistically significant dose-dependent correlation between cumulative exposure to Hg from dental amalgams and urinary levels of GST-α, after covariate adjustment; where as, a nonsignificant relationship was observed with urinary levels of GST-π. Furthermore, it was observed that urinary GST-α levels increased by about 10% over the 8-year course of the study among individuals with an average exposure to amalgams among the study subjects from the amalgam group, in comparison with study subjects with no exposure to dental amalgams. The results of our study suggest that dental amalgams contribute to ongoing kidney damage at the level of the PTs in a dose-dependent fashion.

  8. Characterization of Recombinant, Ureolytic Streptococcus mutans Demonstrates an Inverse Relationship between Dental Plaque Ureolytic Capacity and Cariogenicity

    OpenAIRE

    Clancy, K. Anne; Pearson, Sylvia; Bowen, William H.; Burne, Robert A.

    2000-01-01

    Dental caries results from prolonged plaque acidification that leads to the establishment of a cariogenic microflora and demineralization of the tooth. Urease enzymes of oral bacteria hydrolyze urea to ammonia, which can neutralize plaque acids. To begin to examine the relationship between plaque ureolytic activity and the incidence of dental caries, recombinant, ureolytic strains of Streptococcus mutans were constructed. Specifically, the ureABCEFGD operon from Streptococcus salivarius 57.I ...

  9. Bullying in schoolchildren - its relationship to dental appearance and psychosocial implications: an update for GDPs.

    Science.gov (United States)

    Seehra, J; Newton, J T; DiBiase, A T

    2011-05-14

    Bullying in school-aged children is a global phenomenon. The effects of bullying can be both short- and long-term, resulting in both physiological and psychological symptoms. It is likely that dental care professionals will encounter children who are subjected to bullying. The aim of this narrative review is to discuss the incidence of bullying, the types of bullying, the effects of bullying and the interventions aimed at combating bullying in schoolchildren. The role of dentofacial aesthetics and the relationship of bullying and the presence of a malocclusion are also discussed.

  10. Inter-relationship of intelligence-quotient and self-concept with dental caries amongst socially handicapped orphan children

    Directory of Open Access Journals (Sweden)

    PKS Virk

    2012-01-01

    Full Text Available Context : India has been the focus of many health surveys among normal, physically, and mentally handicapped children. However, the data, concerning oral health conditions of socially handicapped children living in orphanages, are scanty. Aims: To study the effect of parental inadequacy, environmental deprivation, and emotional disturbances on dental caries through intelligence quotient (IQ and self-concept in orphan children and also to co-relate dental caries with different levels of IQ and self-concept. Settings and Design: The study was carried out amongst socially handicapped children living in orphanages. Patients and Methods: 100 children in the age group of 10-14 years from orphanages were selected. Malin′s Intelligence Scale for Indian Children (MISIC was used to assess the intelligence quotient; self-concept questionnaire to assess self-concept of the child and recording of dental caries status of children was done as per WHO Index (1997. StatisticaL Analysis Used : To assess the relationship of dental caries with IQ, student′s unpaired t-test was used and; to find the relationship between self-concept and dental caries, Karl-Pearson′s coefficient of co-relation was applied. Results: the children in orphanages had a lower IQ and high caries experience but had an above average self-concept. There was also no co-relation between dental caries and self-concept. Conclusions: Orphan children, being socially handicapped, are at an increased risk for dental caries due to a lower IQ level, parental deprivation, and institutionalization. Moreover, lack of co-relation between dental caries and self-concept could be explained by the fact that dental caries is a lifelong process whereas different dimensions of self-concept are in a state of constant flux.

  11. Inter-relationship of intelligence-quotient and self-concept with dental caries amongst socially handicapped orphan children.

    Science.gov (United States)

    Virk, Pks; Jain, R L; Pathak, A; Sharma, U; Rajput, J S

    2012-01-01

    India has been the focus of many health surveys among normal, physically, and mentally handicapped children. However, the data, concerning oral health conditions of socially handicapped children living in orphanages, are scanty. To study the effect of parental inadequacy, environmental deprivation, and emotional disturbances on dental caries through intelligence quotient (IQ) and self-concept in orphan children and also to co-relate dental caries with different levels of IQ and self-concept. The study was carried out amongst socially handicapped children living in orphanages. 100 children in the age group of 10-14 years from orphanages were selected. Malin's Intelligence Scale for Indian Children (MISIC) was used to assess the intelligence quotient; self-concept questionnaire to assess self-concept of the child and recording of dental caries status of children was done as per WHO Index (1997). To assess the relationship of dental caries with IQ, student's unpaired t-test was used and; to find the relationship between self-concept and dental caries, Karl-Pearson's coefficient of co-relation was applied. the children in orphanages had a lower IQ and high caries experience but had an above average self-concept. There was also no co-relation between dental caries and self-concept. Orphan children, being socially handicapped, are at an increased risk for dental caries due to a lower IQ level, parental deprivation, and institutionalization. Moreover, lack of co-relation between dental caries and self-concept could be explained by the fact that dental caries is a lifelong process whereas different dimensions of self-concept are in a state of constant flux.

  12. Glossary to ARCH (GARCH)

    DEFF Research Database (Denmark)

    Bollerslev, Tim

    The literature on modeling and forecasting time-varying volatility is ripe with acronyms and abbreviations used to describe the many different parametric models that have been put forth since the original linear ARCH model introduced in the seminal Nobel Prize winning paper by Engle (1982......).  The present paper provides an easy-to-use encyclopedic reference guide to this long list of ARCH acronyms.  In addition to the acronyms associated with specific parametric models, I have also included descriptions of various abbreviations associated with more general statistical procedures and ideas...

  13. Glossary to ARCH (GARCH)

    DEFF Research Database (Denmark)

    Bollerslev, Tim

    The literature on modeling and forecasting time-varying volatility is ripe with acronyms and abbreviations used to describe the many different parametric models that have been put forth since the original linear ARCH model introduced in the seminal Nobel Prize winning paper by Engle (1982......).  The present paper provides an easy-to-use encyclopedic reference guide to this long list of ARCH acronyms.  In addition to the acronyms associated with specific parametric models, I have also included descriptions of various abbreviations associated with more general statistical procedures and ideas...

  14. Relationship between Learning Style and Academic Status of Babol Dental Students

    Science.gov (United States)

    Nasiri, Zahra; Gharekhani, Samane; Ghasempour, Maryam

    2016-01-01

    Introduction Identifying and employing students’ learning styles could play an important role in selecting appropriate teaching methods in order to improve education. The aim of this study was to determine the relationship between the students’ final exam scores and the learning style preferences of dental students at Babol University of Medical Sciences. Methods This cross-sectional study was conducted on 88 dental students studying in their fourth, fifth, and sixth years using the visual–aural–reading/writing–kinesthetic (VARK) learning styles’ questionnaire. The data were analyzed with IBM SPSS, version 21, using the chi-squared test and the t-test. Results Of the 88 participants who responded to the questionnaire, 87 preferred multimodal learning styles. There was no significant difference between the mean of the final exam scores in students who did and did not prefer the aural learning style (p = 0.86), the reading/writing learning style (p = 0.20), and the kinesthetic learning style (p = 0.32). In addition, there was no significant difference between the scores on the final clinical course among the students who had different preferences for learning style. However, there was a significant difference between the mean of the final exam scores in students with and without visual learning style preference (p = 0.03), with the former having higher mean scores. There was no significant relationship between preferred learning styles and gender (p > 0.05). Conclusion The majority of dental students preferred multimodal learning styles, and there was a significant difference between the mean of the final exam scores for students with and without a preference for the visual learning style. In addition, there were no differences in the preferred learning styles between male and female students. PMID:27382442

  15. Electrothermally Tunable Arch Resonator

    KAUST Repository

    Hajjaj, Amal Z.

    2017-03-18

    This paper demonstrates experimentally, theoretically, and numerically a wide-range tunability of electrothermally actuated microelectromechanical arch beams. The beams are made of silicon and are intentionally fabricated with some curvature as in-plane shallow arches. An electrothermal voltage is applied between the anchors of the beam generating a current that controls the axial stress caused by thermal expansion. When the electrothermal voltage increases, the compressive stress increases inside the arch beam. This leads to an increase in its curvature, thereby increasing its resonance frequencies. We show here that the first resonance frequency can increase monotonically up to twice its initial value. We show also that after some electrothermal voltage load, the third resonance frequency starts to become more sensitive to the axial thermal stress, while the first resonance frequency becomes less sensitive. These results can be used as guidelines to utilize arches as wide-range tunable resonators. Analytical results based on the nonlinear Euler Bernoulli beam theory are generated and compared with the experimental data and the results of a multi-physics finite-element model. A good agreement is found among all the results. [2016-0291

  16. Mixing properties of ARCH and time-varying ARCH processes

    CERN Document Server

    Fryzlewicz, Piotr; 10.3150/10-BEJ270

    2011-01-01

    There exist very few results on mixing for non-stationary processes. However, mixing is often required in statistical inference for non-stationary processes such as time-varying ARCH (tvARCH) models. In this paper, bounds for the mixing rates of a stochastic process are derived in terms of the conditional densities of the process. These bounds are used to obtain the $\\alpha$, 2-mixing and $\\beta$-mixing rates of the non-stationary time-varying $\\operatorname {ARCH}(p)$ process and $\\operatorname {ARCH}(\\infty)$ process. It is shown that the mixing rate of the time-varying $\\operatorname {ARCH}(p)$ process is geometric, whereas the bound on the mixing rate of the $\\operatorname {ARCH}(\\infty)$ process depends on the rate of decay of the $\\operatorname {ARCH}(\\infty)$ parameters. We note that the methodology given in this paper is applicable to other processes.

  17. The Evaluation of Relationship between Spirometric Disorders and Methyl methacrylate in Dental Laboratories Personnel

    Directory of Open Access Journals (Sweden)

    E. Nadi

    2010-04-01

    Full Text Available Introduction & Objective: Methyl methacrylate (MMA, as a monomer of acrylic resin that has a wide variety of usages in denture fabrication, is considered as an air pollution indicator in the laboratories. Occupational exposure to these compound vapors can cause respiratory hypersensitivity, occupational asthma, eye and skin irritation and Allergic Contact Dermatitis (ACD. Therefore control of MMA exposure may promote the personnel’s health. The aim of this study was to determine the relationship between spirometric disorders and methyl methacrylate in dental laboratories personnel.. Materials & Methods: In this case control study, exposure of time-weighted average (TWA and short-term exposure level (STEL were measured with MMA vapors in 39 randomly selected male employee (case group in 25 denture fabrication laboratories in Hamadan city. The air samples were collected by sorbent tubes containing chromosorb (XAD2( and analyzed by gas chromatograph equipped with FID detector based on NIOSH method. In addition 30 men whitout occupational exposure to air pollutants (control group were selected to compare the variation of spirometric parameters. Spirometric parameters of the case and control groups such as FVC, FEV1, FEV1/FVC and FEF25-75 were measured by Vitalograph spirometer (model: 2120 on ATS method, after the standard questionnaire of respiratory diseases had been completed during an interview and medical examination..Results: The mean of MMA concentration was 132.87 ± 220.67 ppm for STEL and 1.95 ± 3.59 ppm for TWA.The relationship between MMA concentration in the STEL and TWA exposures was significant (P<0.05 and the relationship between MMA concentration and ventilation was significant just for STEL. In this study no relationship between MMA concentration and spirometric parameters in both STEL and TWA exposures was found. Also there was no significant difference between spirometric parameters of the case group and normal values of the

  18. PRESENCE OF Streptococcus Mutans IN SALIVA AND ITS RELATIONSHIP WITH DENTAL CARIES: ANTIMICROBIAL SUSCEPTIBILITY OF THE ISOLATES

    Directory of Open Access Journals (Sweden)

    Fredy Gamboa

    2004-06-01

    Full Text Available Dental caries is a localized, transmissible, pathological infectious process that ends up in the destruction of hard dental tissue. Streptococcus mutans is considered to be the main cause of dental caries. Indeed, numerous reports have shown the close relationship between salivary levels of S. mutans and dental caries. The purpose of this study was to determine the relationship between the presence of Streptococcus mutans and dental caries, and to evaluate the antimicrobial susceptibility of the isolates. Unstimulated saliva was collected from 53 3 to 5-year-old children from the Diego Torres school in Turmequé (Boyacá, Colombia. Saliva samples were vortexed and serially diluted in 0.05 M phosphate buffer. Aliquots of 100 ul of the appropriate dilutions were cultured on Mitis Salivarius Bacitracin agar medium for the selective isolation of S. mutans, and incubated anaerobically for two days at 37 o C. The minimal inhibitoryconcentrations of the S. mutans isolates were evaluated against penicillin, amoxicillin, cefazolin, erythromycin, clindamycin, imipenem and vancomycin by an agar dilution method. The dental caries experience in these children was 66% (35/53 and S. mutans was found in the saliva of 33 children (62%; 21 of them had dental caries and 12 did not. In the 20 children from whom S. mutans was not isolated, 14 (70% were found to have caries. There were no statistically significant differences in S. mutans counts between the group with dental caries and the caries-free group (p=0.21. All isolates were highly sensitive to penicillin, amoxycillin, cefazolin, erythromycin, clindamycin, imipenem and vancomycin; 50 and 90% of the strains from S. mutans were inhibited by concentrations of less than 0.12 and 0.5 ug/ml, respectively, for all antibiotics studied. In conclusion, not all of the children hosting this microorganism had caries, and the S. mutans strains were highly sensitive to the antibiotics tested.

  19. Tympanic ossicles and pharyngeal arches.

    Science.gov (United States)

    Whyte, J; Cisneros, A; Yus, C; Fraile, J; Obón, J; Vera, A

    2009-02-01

    We have performed a study on 11 human embryos regarding the development of the tympanic ossicles and their relationship with the first pharyngeal arch. After performing measurements to date the embryos and foetuses chronologically, we performed a meticulous dissection of the temporal bones. Subsequently, they were fixed in 10% formol, decalcified with 2% nitric acid, embedded in Paraplast, sectioned in 7-mm sequences and stained with Martin's trichrome technique. In the 21- and 24-mm cranium-raquis (CR) length human embryos, we have observed the head of the malleus and the body of the incus close to Meckel's cartilage, in addition to the handle of the malleus, the long limb of the incus and the stapes. Between them there was a mesenchymal band inside the primordium of the tympanic cavity. In the 27-mm CR embryo, the various components of the malleus and incus were fusing, and in the 30-mm CR embryo the union was complete. From our observations, we can conclude that the malleus and the incus are derived from the first and second pharyngeal arches.

  20. The Relationship between Positive Well-Being and Academic Assessment: Results from a Prospective Study on Dental Students

    Directory of Open Access Journals (Sweden)

    Cristina Teodora Preoteasa

    2016-01-01

    Full Text Available Background. Presumably, the academic stress that builds throughout the academic year has a negative effect on dental students’ psychological well-being and may have a relationship with academic performance. This research aimed to analyse the variation of positive well-being in second-year dental students, across the academic semester, in relation to consecutive examinations as part of academic assessment system (1 and to observe the relationship between academic performance during semester evaluation period and dental students’ positive well-being (2. Methods. A prospective study was conducted on second-year dental students, data on positive well-being being collected with WHO-Five Well-Being Index (WHO-5, at the beginning of the semester and after three consecutive mandatory examinations. Results. One hundred and forty-six dental students were included (77% response rate. Repeated ANOVA showed a significant progressive decline of positive well-being over the semester, which was clinically significant for an important part of them. Students who performed better in the semester evaluation period registered higher well-being levels at the beginning of the semester but a more pronounced decline of it until the semester evaluation period. Conclusion. Based on this research, a relationship between positive well-being, academic assessments, and academic performance is suggested, when evaluating them in a prospective frame.

  1. Co-Relationships between Glandular Salivary Flow Rates and Dental Caries

    Science.gov (United States)

    de Guillory, Carolina Diaz; Schoolfield, John D; Johnson, Dorthea; Yeh, Chih-Ko; Chen, Shuo; Cappelli, David P; Bober-Moken, Irene G; Dang, Howard

    2013-01-01

    Objective This study was designed to evaluate the relationship of age, gender, ethnicity and salivary flow rates on dental caries in an adult population using data collected from the Oral Health San Antonio Longitudinal Study of Aging (OH:SALSA). Background Saliva is essential to maintain a healthy oral environment and diminished output can result in dental caries. Although gender and age play a role in the quantity of saliva, little is known about the interaction of age, gender and ethnicity on dental caries and salivary flow rates. Materials and Methods Data from the 1,147 participants in the OH: SALSA was analyzed. The dependent variables were the number of teeth with untreated coronal caries, number of teeth with root caries, and the number of coronal and root surfaces with untreated caries. The independent variables were stimulated and unstimulated glandular salivary flow rates along with the age, sex, and ethnicity (e.g. European or Mexican ancestry) of the participants. Results Coronal caries experience was greater in younger participants while root surface caries experience was greater in the older participants. Coronal caries was lower in the older age groups while the root caries experience increased. Men had a statistically significant (p<0.02) higher experience of root caries than women. Values for unstimulated and stimulated parotid salivary flow rates showed no age difference and remained constant with age, whereas the age differences in the unstimulated and stimulated submandibular/sublingual salivary flow rates were significant. The mean number of teeth with coronal and root caries was higher in Mexican-Americans than in European-Americans. Conclusions Over one-fourth of the adults between the ages of 60 and 79 have untreated root caries over one-third having untreated coronal caries. Lower salivary flow rates play a significant role in the both the number of teeth and the number of surfaces developing caries in these adults. Women and individuals

  2. Left testicular artery arching over the ipsilateral renal vein

    Institute of Scientific and Technical Information of China (English)

    Munekazu Naito; Hayato Terayama; Yoichi Nakamura; Shogo Hayashi; Takayoshi Miyaki; Masahiro Itoh

    2006-01-01

    Aim: To report two cases of the left testicular artery arching over the left renal vein (LRV) before running downward to the testis. Methods: The subjects were obtained from two Japanese cadavers. During the student course of gross-anatomical dissection, the anatomical relationship between the testicular vessels and the renal vein was specifically observed. Results: The arching left testicular artery arose from the aorta below the LRV and made a loop around the LRV, which appeared to be mildly compressed between the arching artery and the psoas major muscle.Conclusion: Clinically, compression of the LRV between the abdominal aorta and the superior mesenteric artery occasionally induces LRV hypertension, resulting in varicocele, orthostatic protenuria and hematuria. Considering that the incidence of a left arching testicular artery is higher than that of a right one, an arching left artery could be an additional cause of LRV hypertension.

  3. Comparison of arch forms between Turkish and North American

    Directory of Open Access Journals (Sweden)

    Ahmet A. Celebi

    2016-04-01

    Full Text Available ABSTRACT Objective: The aim of this study was to clarify the morphological differences in the mandibular arches of Turkish and North American white subjects. Methods: The sample included 132 Turkish (34 Class I, 58 Class II, and 40 Class III and 160 North American (60 Class I, 50 Class II, and 50 Class III subjects. The most facial portion of 13 proximal contact areas was digitized from photocopied images of patients' mandibular dental arches. Clinical bracket points were calculated for each tooth based on mandibular tooth thickness data. Four linear and two proportional measurements were taken. The subjects were grouped according to arch form types (tapered, ovoid and square in order to have frequency distribution compared between ethnic groups in each Angle classification. Results: The Turkish group showed significantly lower molar depth and more significant molar width-depth (W/D ratio in all three Angle classifications. On the other hand, the Turkish group also showed a significantly larger intercanine width in Class III malocclusion and intermolar width in Class II malocclusion. The most frequent arch forms seen were the ovoid arch form in the Turkish group and the tapered form in the white group. Conclusions: Our results demonstrate that when treating Turkish patients, one should expect to use preformed ovoid arch form orthodontic wires in a significant percentage of patients.

  4. Comparison of arch forms between Turkish and North American

    Science.gov (United States)

    Celebi, Ahmet A.; Keklik, Hakan; Tan, Enes; Ucar, Faruk I.

    2016-01-01

    ABSTRACT Objective: The aim of this study was to clarify the morphological differences in the mandibular arches of Turkish and North American white subjects. Methods: The sample included 132 Turkish (34 Class I, 58 Class II, and 40 Class III) and 160 North American (60 Class I, 50 Class II, and 50 Class III) subjects. The most facial portion of 13 proximal contact areas was digitized from photocopied images of patients' mandibular dental arches. Clinical bracket points were calculated for each tooth based on mandibular tooth thickness data. Four linear and two proportional measurements were taken. The subjects were grouped according to arch form types (tapered, ovoid and square) in order to have frequency distribution compared between ethnic groups in each Angle classification. Results: The Turkish group showed significantly lower molar depth and more significant molar width-depth (W/D) ratio in all three Angle classifications. On the other hand, the Turkish group also showed a significantly larger intercanine width in Class III malocclusion and intermolar width in Class II malocclusion. The most frequent arch forms seen were the ovoid arch form in the Turkish group and the tapered form in the white group. Conclusions: Our results demonstrate that when treating Turkish patients, one should expect to use preformed ovoid arch form orthodontic wires in a significant percentage of patients. PMID:27275615

  5. An Investigation into the Relationship between Owner Knowledge, Diet, and Dental Disease in Guinea Pigs (Cavia porcellus).

    Science.gov (United States)

    Norman, Rosemary; Wills, Alison P

    2016-11-14

    Recent studies have highlighted a high prevalence of dental disease in domestic guinea pigs, yet the aetiology of this multi-factorial disease is still unclear. Factors that have been associated with dental disease include feeding a diet that is high in energy but low in fibre, feeding an insufficiently abrasive diet, a lack of dietary calcium, and genetics. As many of these factors relate to the husbandry requirements of guinea pigs, owner awareness of dietary requirements is of the utmost importance. An online questionnaire was created based on previous research into the husbandry and feeding of rabbits. Guinea pig owners were asked to answer questions on the clinical history of their animals and their diet and management. In total, 150 surveys were completed for 344 guinea pigs, where owners of multiple animals could complete the survey for individuals. According to the owners, 6.7% of guinea pigs had been clinically diagnosed with dental disease, but 16.6% had signs consistent with dental disease. The specific clinical signs of having difficulty eating (Exp(B) = 33.927, Nagelkerke R ² = 0.301, p guinea pig diet, and dental disease in the study population. This study highlights the importance of access to the outdoors for the health and welfare of guinea pigs in addition to the need for owners to be alert to key clinical signs. A relationship between diet and dental disease was not identified in this study; however, the underlying aetiological causes of this condition require further investigation.

  6. The ARCHES Project

    Science.gov (United States)

    Motch, C.; Arches Consortium

    2015-09-01

    The Astronomical Resource Cross-matching for High Energy Studies (ARCHES) project is a FP7-Space funded programme started in 2013 and involving the Observatoire Astronomique de Strasbourg including the CDS (France), the Leibniz- Institut für Astrophysik Potsdam (Germany), the University of Leicester (UK), the Universidad de Cantabria (IFCA, Spain) and the Instituto Nacional de Tecnica Aeroespacial (Spain). ARCHES will provide the international astronomical community with well-characterised multi-wavelength data in the form of spectral energy distributions (SEDs) for large samples of objects extracted from the 3XMM X-ray catalogue of serendipitous sources. The project develops new tools implementing fully probabilistic simultaneous cross-correlation of several catalogues and a multi-wavelength finder for clusters of galaxies. SEDs are based on an enhanced version of the 3XMM catalogue and on a careful selection of the most relevant multi-wavelength archival catalogues. In order to ensure the largest audience, SEDs will be distributed to the international community through CDS services and through the Virtual Observatory. These enhanced resources are tested in the framework of several science cases. More information may be found at http://www.arches-fp7.eu/

  7. [Determining and recording maxillomandibular relationships for the fabrication of single-unit and multi-unit fixed dental prostheses

    NARCIS (Netherlands)

    Wiersema, E.J.; Kreulen, C.M.; Baat, C. de; Witter, D.J.; Creugers, N.H.J.

    2013-01-01

    In a correctly functioning occlusal system, the design of the occlusal parts of single-unit and multi-unit fixed dental prostheses is generally determined by the maximum intercuspation. Determining and recording the maxillomandibular relationships is only required in case the adjacent teeth do not

  8. [Determining and recording maxillomandibular relationships for the fabrication of single-unit and multi-unit fixed dental prostheses

    NARCIS (Netherlands)

    Wiersema, E.J.; Kreulen, C.M.; Baat, C. de; Witter, D.J.; Creugers, N.H.J.

    2013-01-01

    In a correctly functioning occlusal system, the design of the occlusal parts of single-unit and multi-unit fixed dental prostheses is generally determined by the maximum intercuspation. Determining and recording the maxillomandibular relationships is only required in case the adjacent teeth do not o

  9. Relationship between Dental Anxiety and Health Locus of Control among Physiotherapy Students

    Directory of Open Access Journals (Sweden)

    Pooja Agarwal

    2013-01-01

    Materials & Method: A total of 152 students participated in the study. Dental anxiety was assessed using the 5 item Modified Dental Anxiety Scale (MDAS and Locus of Control was assessed using the 18 item Multidimensional Health Locus of Control (MHLC scale. Results: A Statistically significant positive correlation was found between the internal dimension of MHLC and dental anxiety. Conclusions: HLC was found to play an important role in predicting the dental anxiety among physiotherapy students.

  10. The relationship between neighborhood empowerment and dental caries experience: a multilevel study in adolescents and adults

    Directory of Open Access Journals (Sweden)

    Bianca Marques Santiago

    2014-01-01

    Full Text Available OBJECTIVE: To investigate the relationship of contextual social capital (neighborhood empowerment and individual social capital (social support and social network with dental caries experience in adolescents and adults. METHODS: A population-based multilevel study was conducted involving 573 subjects, 15-19 and 35-44 years of age, from 30 census tracts in three cities of Paraíba, Brazil. A two-stage cluster sampling was used considering census tracts and households as sampling units. Caries experience was assessed using the DMFT index (decayed, missing and filled teeth and participants were divided into two groups according to the median of the DMFT index in low and high caries experience. Demographic, socioeconomic, behaviors, use of dental services and social capital measures were collected through interviews. Neighborhood empowerment was obtained from the mean scores of the residents in each census tract. Multilevel multivariate logistic regression was used to test the relationship between neighborhood empowerment and caries experience. RESULTS: High caries experience was inversely associated with neighborhood empowerment (OR = 0.58; 95%CI 0.33 - 0.99. Individual social capital was not associated with caries experience. Other associated factors with caries experience were age (OR = 1.15; 95%CI 1.12 - 1.18 and being a female (OR = 1.72; 95%CI 1.08 - 2.73. CONCLUSION: The association between neighborhood empowerment and caries experience suggests that the perception of features of the place of residence should be taken into account in actions of oral health promotion.

  11. Maxillary Arch Dimension Changes of 3-5 Years Old Filipino Children

    Directory of Open Access Journals (Sweden)

    Abdol Hamid Zafarmand

    2014-11-01

    Full Text Available Background: The purpose of this study was to assess the dental arch dimensions in primary dentition of 3-5 years old Filipino children and determining the existence of sexual dimorphism.Materials and Methods: In this descriptive study, 60 Filipino preschool children aged 3-5 years old were selected from Manila city. Study casts were used for measurements of 3 arch dimensions: bicanine width, bimolar width, and arch length. The analyses were performed to compare values within age-groups and within gender-groups, besides reporting mean and standard deviations. The data were subjected to One-way ANOVA and Student t-test.Results: Significant differences were observed regarding dental arch dimensions among different ages and genders (p<0.05. Comparison between genders showed a statistically significant difference in bicanine width at the age of 4 (p=0.04, in bimolar width at age of 5 (p=0.006, and in arch length at age of 4 (p=0.03 and 5 (p=0.02. Differences within male group for different ages showed only arch length dimension was statistically significant (p=0.021. In females, however the comparison between age-groups also revealed a statistically significant difference in bicanine (p= 0.016 and bimolar widths (p=0.027 dimensions.Conclusion: The present study showed that dental arch dimensions, vary among different ages and genders of children. It also showed that a sexual dimorphism does exist between the gender groups.

  12. The relationship of orthodontic treatment need with periodontal status, dental caries, and sociodemographic factors.

    Science.gov (United States)

    Nalcaci, Ruhi; Demirer, Serhat; Ozturk, Firat; Altan, Burcu A; Sokucu, Oral; Bostanci, Vildan

    2012-01-01

    The aim of this study was to determine the relationship of orthodontic malocclusion with periodontal status, dental caries, and sociodemographic status. Our study population consisted of a sample of 836 school children (384 male and 452 female, aged 11-14 years). Four experienced orthodontists and two experienced periodontists performed the clinical examinations. The Treatment Priority Index (TPI), Community Periodontal Index of Treatment Needs (CPITN), decayed, missing, filled teeth (DMFT) scores, and a questionnaire that surveyed socio-demographic status of students were used. Spearman's rank correlation coefficients were used to measure the association between variables. TPI scores showed that 36.4% of the students had normal occlusion, while 41.2% had slight, 15.7% had definite, 4% had severe, and 2.7% had very severe malocclusion. TPI values did not show any significant differences between pupils in different age, gender, socioeconomic status groups, and CPITN scores, whereas there was a significant relationship between TPI and DMFT scores. The orthodontic treatment need was not significantly correlated with CPITN or socio-demographic status; however, the correlation coefficient showed a significant relationship between TPI and DMFT scores.

  13. The Relationship of Orthodontic Treatment Need with Periodontal Status, Dental Caries, and Sociodemographic Factors

    Directory of Open Access Journals (Sweden)

    Ruhi Nalcaci

    2012-01-01

    Full Text Available The aim of this study was to determine the relationship of orthodontic malocclusion with periodontal status, dental caries, and sociodemographic status. Our study population consisted of a sample of 836 school children (384 male and 452 female, aged 11–14 years. Four experienced orthodontists and two experienced periodontists performed the clinical examinations. The Treatment Priority Index (TPI, Community Periodontal Index of Treatment Needs (CPITN, decayed, missing, filled teeth (DMFT scores, and a questionnaire that surveyed socio-demographic status of students were used. Spearman’s rank correlation coefficients were used to measure the association between variables. TPI scores showed that 36.4% of the students had normal occlusion, while 41.2% had slight, 15.7% had definite, 4% had severe, and 2.7% had very severe malocclusion. TPI values did not show any significant differences between pupils in different age, gender, socioeconomic status groups, and CPITN scores, whereas there was a significant relationship between TPI and DMFT scores. The orthodontic treatment need was not significantly correlated with CPITN or socio-demographic status; however, the correlation coefficient showed a significant relationship between TPI and DMFT scores.

  14. A discrepância de tamanho dentário, de Bolton, na oclusão normal e nos diferentes tipos de más oclusões, bem como sua relação com a forma de arco e o posicionamento dentário Bolton tooth size discrepancy in normal occlusion and in different types of malocclusions and its relationship to arch form and tooth positioning

    Directory of Open Access Journals (Sweden)

    Luiz Sérgio Carreiro

    2005-06-01

    Full Text Available Esta pesquisa teve como objetivo geral avaliar a discrepância de tamanho dentário, na oclusão normal e nos diferentes tipos de más oclusões e a sua relação com as medidas que determinam a forma de arco e o posicionamento dentário na região anterior. Para tanto, foram estudados 185 pares de modelos de gesso, divididos em 4 grupos: Grupo 1 (composto por 41 pares com Oclusão Normal, sendo 20 do gênero masculino e 21 do gênero feminino; Grupo 2 (composto por 44 pares com má oclusão de Classe I, divisão 1, sendo 22 do gênero masculino e 22 do gênero feminino; Grupo 3 (composto por 54 pares com má oclusão de Classe II, sendo 28 do gênero masculino e 26 do gênero feminino e Grupo 4 (composto por 46 pares com Classe III, sendo 23 do gênero masculino e 23 do gênero feminino. Observou-se que não ocorreu dimorfismo sexual entre as discrepâncias de tamanho dentário e os diferentes tipos de oclusão dentária; as proporções estabelecidas por Bolton não se aplicaram ao grupo com Oclusão Normal; na Oclusão Normal, Classe I, Classe II e Classe III, houve um predomínio de excesso dentário total (RAZ12 no arco inferior; na Classe I houve uma igualdade na distribuição de excesso dentário anterior (RAZ6 nos arcos superior e inferior; na Oclusão Normal, Classe II e Classe III, ocorreu um predomínio de excesso dentário anterior (RAZ6 no arco inferior, em relação ao arco superior; os excessos dentários não contribuíram na ocorrência das más oclusões e as discrepâncias total e anterior (RAZ12 e RAZ6 não interferiram diretamente nas larguras e comprimentos dos arcos, bem como no posicionamento dos dentes anteriores.The general purpose of this study was to evaluate tooth size discrepancy in normal occlusion and in different malocclusion types and its relationship to measurements which determine arch form and anterior tooth positioning. One hundred and eighty five sets of casts of leucoderms were divided into four groups

  15. Seismic multi-arch structures in East China

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    In previous papers (Wencai, 2002, 2003), the author has analyzed the deep seismic reflection profiles along some of the Mesozoic plutons in East China, and has pointed out that the crustal structures around these intrusions usually correlate with a special seismic fabric called the seismic multi-arch structure. This paper will continue to show main characteristics of the seismic multi-arch structures and discuss their relationship with mantle-origin magmatism and the lithospheric thinning process. Calibration of seismic reflectors in Chinese continental drilling sites shows that small-scale arch-like reflectors can be generated by fractured eclogites or other plutons, they do not belong to the multi-arch structure specially discussed in the paper. The multi-arch structure is characterized by several arch-like reflectors distributed in both the upper and lower crust with granitoid plutons or stocks exposed on the surface, which do not have obvious negative Europium anomalies. Based on the distribution pattern of arch reflectors, the multi-arch magmatic structures can be divided into three main types, namely the simple vertical combination type, the spread arch magmatic structure and the arch-bouquet structure. All of them correlate to mantle-origin magmatism, but occur in different places. The spread arch magmatic structures occur within a Mesozoic/Cenozoic rift zone with very thin and hot lithosphere. The vertical combination type of the multi-arch structures occurred near the rift zones where lithosphere was thin and hot. The arch-bouquet magmatic structures occur far from the rift zones where the lithosphere is not hot. The continental rifting acted as the late episode of the lithospheric thinning process seeing that the rift zones usually coincide with the thinnest parts of the lithosphere in East China. In different locations within the lithospheric thinning areas, mantle-origin magmatic activities have different characteristics, which might generate different

  16. The Relationship Between Dental Students' Assessment Ability and Preclinical and Academic Performance in Operative Dentistry.

    Science.gov (United States)

    Lee, Cliff; Asher, Sheetal R; Chutinan, Supattriya; Gallucci, German O; Ohyama, Hiroe

    2017-03-01

    Self-assessment is a critical skill for health care professionals. Because these professionals must be lifelong, self-directed learners and self-regulating practitioners, the ability to self-assess is essential for them. The aims of this study were to measure how dental students self-assessed and peer-assessed their performance in preclinical operative procedures and to evaluate any relationship between their assessment ability and preclinical skills or academic performance. The study was conducted from 2015 to 2016. Third-year students at Harvard School of Dental Medicine self-assessed their work on four preclinical practical exams: Class II amalgam preparation, Class II amalgam restoration, Class III composite preparation, and Class III composite restoration. Three faculty members graded the same preparations and restorations. The difference between the students' self-assessment and the mean faculty assessment was calculated as the student-faculty (S-F) gap. An absolute S-F gap was also calculated with absolute values of differences. A total of 71 students completed these practical exams: 36 in the Class of 2016 and 35 in the Class of 2017. All 71 self-assessments for each of the four practical exams were collected for a response rate of 100%. The results showed that the mean S-F gap ranged from 2% to 8%, and the absolute S-F gap ranged from 7% to 12%. Preclinical performance was correlated with self-assessment accuracy. Low-performing students significantly overestimated their self-assessments compared to the rest of the class. High-performing students had more accurate self-assessments and tended to underestimate themselves. Overall, these results showed that the students had room for improving the accuracy of their self-assessments.

  17. Understanding the relationships between breastfeeding, malocclusion, ADHD, sleep-disordered breathing and traumatic dental injuries.

    Science.gov (United States)

    Sabuncuoglu, Osman

    2013-03-01

    Attention-deficit/hyperactivity disorder (ADHD), one of the most common neuropsychiatric disorders that present at young age, may occasionally be associated with physical problems and disorders. Among them exists a group of oral-pharyngeal conditions with considerable clinical morbidity. Previous research that identified absence or short duration of breastfeeding in ADHD children has been reviewed. Essential nutritional factors in breast milk can affect brain development and regulate the manifestation of ADHD symptoms. Low ferritin levels caused by insufficient breastfeeding may contribute to ADHD susceptibility because of the role of iron in dopaminergic activity. Insufficient breast feeding and subsequently excessive bottle-feeding may lead to increased rates of non-nutritive sucking habits, such as pacifier use and thumb-sucking, all of which are associated with the risk of development of malocclusions. Malocclusion refers to an unacceptable deviation from the ideal relationship of the upper and lower teeth and necessitates orthodontic treatment. Sleep-disordered breathing in children may present with neurocognitive symptoms that resemble ADHD and abnormal craniofacial developments, as well as malocclusions, have been cited as part of the syndrome. Obesity, which is an outcome of insufficient breastfeeding, is a shared comorbidity of ADHD and sleep-disordered breathing. The risk of traumatic dental injury is higher in children with ADHD and presence of malocclusions further increases the likelihood of dental injuries. In this review, certain oral-pharyngeal conditions relating to ADHD have been reviewed and links among them have been highlighted in a tentative explanatory model. More research that will provide increased awareness and clinical implications is needed.

  18. Double arch mirror study

    Science.gov (United States)

    Vukobratovich, D.; Hillman, D.

    1983-01-01

    The development of a method of mounting light weight glass mirrors for astronomical telescopes compatible with the goals of the Shuttle Infrared Telescope Facility (SIRTF) was investigated. A 20 in. diameter double arch lightweight mirror previously fabricated was modified to use a new mount configuration. This mount concept was developed and fabricated. The mounting concept of the double mounting mirror is outlined. The modifications made to the mirror, fabrication of the mirror mount, and room temperature testing of the mirror and mount and the extension of the mirror and mount concept to a full size (40 in. diameter) primary mirror for SIRTF are discussed.

  19. The ARCHES project

    CERN Document Server

    Motch, C; Genova, F; Esteban, F Jiménez-; López, M; Michel, L; Mingo, B; Mints, A; Gómez-Morán, A Nebot; Pineau, F -X; Rosen, S; Sanchez, E; Schwope, A; Solano, E; Watson, M

    2016-01-01

    ARCHES (Astronomical Resource Cross-matching for High Energy Studies) is a FP7-Space funded project whose aim is to provide the international astronomical community with well-characterised multi-wavelength data in the form of spectral energy distributions (SEDs) for large samples of objects extracted from the 3XMM DR5 X-ray catalogue of serendipitous sources. The project has developed new tools implementing fully probabilistic simultaneous cross-correlation of several catalogues for unresolved sources and a multi-wavelength finder for clusters of galaxies for extended sources. These enhanced resources have been tested in the framework of several science cases.

  20. Relationship among microbiological composition and presence of dental plaque, sugar exposure, social factors and different stages of early childhood caries.

    Science.gov (United States)

    Parisotto, Thaís Manzano; Steiner-Oliveira, Carolina; Duque, Cristiane; Peres, Regina Célia Rocha; Rodrigues, Lidiany Karla Azevedo; Nobre-dos-Santos, Marinês

    2010-05-01

    This cross-sectional study aimed to investigate the relationship among microbiological composition of dental plaque, sugar exposure and social factors, as well as the presence of visible plaque in preschoolers with different stages of early childhood caries. A total of 169 children were clinically examined according to the World Health Organisation criteria + early caries lesions and were divided into three groups: caries-free (n=53), early caries lesions-ECL (n=56), and cavitated caries lesions-CCL (n=60). The presence of clinically visible dental plaque on maxillary incisors was recorded. After that, dental plaque from all buccal and lingual smooth surfaces was collected and the number of colony-forming units of mutans streptococci and total microorganism, as well as the presence of lactobacilli was determined. Daily frequency of meals containing sugar was assessed by a diet chart whereas social factors were evaluated by a questionnaire. The data were analysed by chi-square test followed by multiple logistic regressions (alpha=0.05, confidence interval=95%). High levels of mutans streptococci (OR=2.28), high total sugar exposure (OR=5.45) and presence of dental plaque (OR=2.60) showed significant association with ECL (pearly stage of caries is highly affected by mutans streptococci and visible dental plaque on maxillary incisors whereas cavities are strongly related to lactobacilli and total microorganism. Copyright 2010 Elsevier Ltd. All rights reserved.

  1. Dental Occlusion and Ophthalmology: A Literature Review

    Science.gov (United States)

    Marchili, Nicola; Ortu, Eleonora; Pietropaoli, Davide; Cattaneo, Ruggero; Monaco, Annalisa

    2016-01-01

    Stomatognathic system is strictly correlated to other anatomical regions; many studies investigated relationship between temporomandibular joint and posture, several articles describe cranio-facial pain from dental causes, such as trigger points. Until now less interest has been given to connections between dental occlusion and ophthalmology, even if they are important and involving. Clinical experience in dental practice claims that mandibular latero-deviation is connected both to eye dominance and to defects of ocular convergence. The trigeminal nerve is the largest and most complex of the twelve cranial nerves. The trigeminal system represents the connection between somitic structures and those derived from the branchial arches, collecting the proprioception from both somitic structures and oculomotor muscles. The intermedius nucleus of the medulla is a small perihypoglossal brainstem nucleus, which acts to integrate information from the head and neck and relays it on to the nucleus of the solitary tract where autonomic responses are generated. This intriguing neurophysiological web led our research group to investigate anatomical and functional associations between dental occlusion and vision. In conclusion, nervous system and functional pathways strictly connect vision and dental occlusion, and in the future both dentists and oculists should be more and more aware of this correlation for a better diagnosis and therapy. PMID:27733873

  2. Class III correction using an inter-arch spring-loaded module.

    Science.gov (United States)

    Vanlaecken, Robert; Williams, Michael O; Razmus, Thomas; Gunel, Erdogan; Martin, Chris; Ngan, Peter

    2014-05-02

    A retrospective study was conducted to determine the cephalometric changes in a group of Class III patients treated with the inter-arch spring-loaded module (CS2000®, Dynaflex, St. Ann, MO, USA). Thirty Caucasian patients (15 males, 15 females) with an average pre-treatment age of 9.6 years were treated consecutively with this appliance and compared with a control group of subjects from the Bolton-Brush Study who were matched in age, gender, and craniofacial morphology to the treatment group. Lateral cephalograms were taken before treatment and after removal of the CS2000® appliance. The treatment effects of the CS2000® appliance were calculated by subtracting the changes due to growth (control group) from the treatment changes. All patients were improved to a Class I dental arch relationship with a positive overjet. Significant sagittal, vertical, and angular changes were found between the pre- and post-treatment radiographs. With an average treatment time of 1.3 years, the maxillary base moved forward by 0.8 mm, while the mandibular base moved backward by 2.8 mm together with improvements in the ANB and Wits measurements. The maxillary incisor moved forward by 1.3 mm and the mandibular incisor moved forward by 1.0 mm. The maxillary molar moved forward by 1.0 mm while the mandibular molar moved backward by 0.6 mm. The average overjet correction was 3.9 mm and 92% of the correction was due to skeletal contribution and 8% was due to dental contribution. The average molar correction was 5.2 mm and 69% of the correction was due to skeletal contribution and 31% was due to dental contribution. Mild to moderate Class III malocclusion can be corrected using the inter-arch spring-loaded appliance with minimal patient compliance. The overjet correction was contributed by forward movement of the maxilla, backward and downward movement of the mandible, and proclination of the maxillary incisors. The molar relationship was corrected by mesialization of the

  3. Relationship between Primary and Secondary Dental Care in Public Health Services in Brazil

    Science.gov (United States)

    dos Reis, Clarice Magalhães Rodrigues; da Matta Machado, Antonio Thomaz Gonzaga; do Amaral, João Henrique Lara

    2016-01-01

    This cross-sectional study evaluated the relationship between primary and secondary oral health care in Brazil. For this purpose, data from the National Program for Improving Access and Quality of Primary Care were used. Dentists from 12,403 oral health teams (OHTs) answered a structured questionnaire in 2012. The data were analyzed descriptively and by cluster analysis. Of the 12,387 (99.9%) OHTs that answered all the questions, 62.2% reported the existence of Dental Specialties Centers (DSCs) to which they could refer patients. The specialties with the highest frequencies were endodontics (68.4%), minor oral surgery (65.8%), periodontics (63.0%), radiology (46.8%), oral medicine (40.2%), orthodontics (20.5%) and implantology (6.2%). In all percentiles, the shortest wait time for secondary care was for radiology, followed by oral medicine and the other specialties. In the 50th percentile, the wait for endodontics, periodontics, minor oral surgery and orthodontics was 30 days, while for implantology, the wait was 60 days. Finally, in the 75th percentile, the wait for endodontics, orthodontics and implantology was 90 days or more. Two clusters, with different frequencies of OHT access to specialties, were identified. Cluster 1 (n = 7,913) included the OHTs with lower frequencies in all specialties except orthodontics and implantology compared with Cluster 2 (n = 4,474). Of the Brazilian regions, the South and Southeast regions had the highest frequencies for Cluster 2, with better rates for the relationship between primary and secondary care. This study suggests certain difficulties in the relationship between primary and secondary care in specific specialties in oral health, with a great number of OHTs with limited access to DSCs, in addition to different performance in terms of OHT access to DSCs across Brazilian regions. PMID:27755603

  4. Volunteerism among Dental Hygienists: The Relationship between a Practice Act Incentive, Behaviors, Perceptions and Motivational Orientations

    National Research Council Canada - National Science Library

    Wilkie, Sandra D; Gurenlian, JoAnn R; Freudenthal, Jacqueline J

    2015-01-01

    ... courses This study compared registered dental hygienists' donations of time and professional expertise, perceptions of volunteerism and motivational orientations as they practice in both the presence...

  5. An Investigation into the Relationship between Owner Knowledge, Diet, and Dental Disease in Guinea Pigs (Cavia porcellus

    Directory of Open Access Journals (Sweden)

    Rosemary Norman

    2016-11-01

    Full Text Available Recent studies have highlighted a high prevalence of dental disease in domestic guinea pigs, yet the aetiology of this multi-factorial disease is still unclear. Factors that have been associated with dental disease include feeding a diet that is high in energy but low in fibre, feeding an insufficiently abrasive diet, a lack of dietary calcium, and genetics. As many of these factors relate to the husbandry requirements of guinea pigs, owner awareness of dietary requirements is of the utmost importance. An online questionnaire was created based on previous research into the husbandry and feeding of rabbits. Guinea pig owners were asked to answer questions on the clinical history of their animals and their diet and management. In total, 150 surveys were completed for 344 guinea pigs, where owners of multiple animals could complete the survey for individuals. According to the owners, 6.7% of guinea pigs had been clinically diagnosed with dental disease, but 16.6% had signs consistent with dental disease. The specific clinical signs of having difficulty eating (Exp(B = 33.927, Nagelkerke R 2 = 0.301, p < 0.05 and producing fewer or smaller faecal droppings (Exp(B = 13.733, Nagelkerke R 2 = 0.149, p < 0.05 were predictive for the presence of dental disease. Having access to an outside environment, including the use of runs on both concrete and grass, was significantly related to not displaying clinical signs of dental disease (Exp(B = 1.894, Nagelkerke R 2 = 0.021, p < 0.05. There was no significant relationship between owner knowledge, guinea pig diet, and dental disease in the study population. This study highlights the importance of access to the outdoors for the health and welfare of guinea pigs in addition to the need for owners to be alert to key clinical signs. A relationship between diet and dental disease was not identified in this study; however, the underlying aetiological causes of this condition require further investigation.

  6. Space maintainer effects on intercanine arch width and length.

    Science.gov (United States)

    Dincer, M; Haydar, S; Unsal, B; Turk, T

    1996-01-01

    In order to investigate the effects of space maintainers in intercanine arch width and length, twenty cases, characterized with the early loss of mandibular primary molars were selected and divided into two groups. The treatment group used removable space maintainers, while the other ten cases served as the control group. The first dental casts of the treatment and control groups were obtained when the primary canines were in the mouth. After the eruption of permanent canines second dental casts were obtained in both groups. Six measurements were made on the dental casts of each patient. No parameter was found to be statistically significant in the treatment group. In the control group the increase in intercanine arch width and perimeter were found to be statistically significant. Also the increase at the buccal and lingual bone measurements were found to be statistically significant. These results showed that space maintainers might cease the increase in intercanine arch width and length during the transition period between the primary and permanent canines.

  7. The Relationship between dental status, body mass index and nutrient intake

    Directory of Open Access Journals (Sweden)

    Roodabeh Koodaryan

    2014-07-01

    Full Text Available Introduction: Nutrition is one of the basic requirements for growth and development. In all the age groups, good oral health is necessary for masticatory efficacy, sense of taste, deglutition, articulation and aesthetics. The aim of this study was to assess the relationship between tooth loss and food intake in a group of middle aged population. Materials and Methods: A total number of 200 participants with age range of 40-60 years were chosen and divided into four groups. The study population was classified into one of four groups by number of permanent teeth present. Required data for the study were gathered by interviews, oral and dental examinations, anthropometric measurements and 24-hour dietary recall. Data were analyzed statistically by descriptive methods, Variance test, Kruskal-Wallis test and Pearson’s chi-square test. Results: Statistical analysis proved that, by controlling important confounding factors, individuals with more teeth had higher mean body mass index, weight, height, energy and nutrient intake compared to those with fewer teeth. Conclusion: Food intake and nutritional status are associated with oral health status and number of teeth.   Key words: Body mass index; Food intake; Tooth loss

  8. Oral findings and dental treatment in a child with West syndrome.

    Science.gov (United States)

    Regis, Rômulo Rocha; Rocha, Cristiane Tomaz; Torres, Carolina Paes; Queiroz, Ivna Fernandes; de Queiroz, Alexandra Mussolino

    2009-01-01

    West syndrome (WS) is a rare, severe form of epilepsy that typically manifests early in infancy. It is considered a malignant condition that combines episodes of spasms that occur in clusters (infantile spasm), hypsarrhythmia on the electroencephalogram, and neuropsychomotor delay. Although WS has been widely investigated from a medical standpoint, few reports have focused on the oral findings in patients with this syndrome. This article reports the case history of a 7-year-old child diagnosed with WS. The major clinical features were generalized tooth wear and gingival enlargement, altered chronology and sequence of dental eruption, primary canine cusp-to-cusp relationship, ectopic dental eruption, and mildly arched palate. Multiple white spot lesions were also observed, possibly associated with poor oral hygiene, due to a fermentable carbohydrate-rich diet, and continuous use of sugar-containing medications. Dental care management of patients with special needs is discussed and the dental treatment for this child with WS is described.

  9. Malocclusion Class II division 1 skeletal and dental relationships measured by cone-beam computed tomography.

    Science.gov (United States)

    Xu, Yiling; Oh, Heesoo; Lagravère, Manuel O

    2017-09-01

    The purpose of this study was to locate traditionally-used landmarks in two-dimensional (2D) images and newly-suggested ones in three-dimensional (3D) images (cone-beam computer tomographies [CBCTs]) and determine possible relationships between them to categorize patients with Class II-1 malocclusion. CBCTs from 30 patients diagnosed with Class II-1 malocclusion were obtained from the University of Alberta Graduate Orthodontic Program database. The reconstructed images were downloaded and visualized using the software platform AVIZO(®). Forty-two landmarks were chosen and the coordinates were then obtained and analyzed using linear and angular measurements. Ten images were analyzed three times to determine the reliability and measurement error of each landmark using Intra-Class Correlation coefficient (ICC). Descriptive statistics were done using the SPSS statistical package to determine any relationships. ICC values were excellent for all landmarks in all axes, with the highest measurement error of 2mm in the y-axis for the Gonion Left landmark. Linear and angular measurements were calculated using the coordinates of each landmark. Descriptive statistics showed that the linear and angular measurements used in the 2D images did not correlate well with the 3D images. The lowest standard deviation obtained was 0.6709 for S-GoR/N-Me, with a mean of 0.8016. The highest standard deviation was 20.20704 for ANS-InfraL, with a mean of 41.006. The traditional landmarks used for 2D malocclusion analysis show good reliability when transferred to 3D images. However, they did not reveal specific skeletal or dental patterns when trying to analyze 3D images for malocclusion. Thus, another technique should be considered when classifying 3D CBCT images for Class II-1malocclusion. Copyright © 2017 CEO. Published by Elsevier Masson SAS. All rights reserved.

  10. Volunteerism among Dental Hygienists: The Relationship between a Practice Act Incentive, Behaviors, Perceptions and Motivational Orientations.

    Science.gov (United States)

    Wilkie, Sandra D; Gurenlian, JoAnn R; Freudenthal, Jacqueline J

    2015-10-01

    Thirteen states in the nation authorize dental hygienists to satisfy re-licensure requirements in part, by performing pro bono oral health services in lieu of participating in continuing education courses This study compared registered dental hygienists' donations of time and professional expertise, perceptions of volunteerism and motivational orientations as they practice in both the presence and absence of a practice act statute intended to incentivize volunteerism. Volunteer behaviors, perceptions and motivational orientations of a non probability sample of 316 dental hygienists actively licensed by the states of Idaho or Utah, were assessed using an online survey which included the Self Determination Theory General Causality Orientations Scale (GCOS). Survey Monkey results were analyzed using Mann Whitney U tests, Chi-Square analysis and an Independent Samples t-test at the 0.05 level of significance. No statistically significant differences were found between dental hygienists' volunteer behaviors, perceptions of volunteerism or scores on the GCOS Autonomy and Impersonal subscales in the 2 states studied. Statistical analysis of dental hygienists' mean scores on the GCOS measure of Controlled motivational orientation yielded a significant difference (p=0.001) among Utah and Idaho dental hygienists. Dental hygienists require evidence based practice statutes and regulations that keep pace with the need to provide universal access to comprehensive oral care. Additional research is required to determine the effectiveness of legislation intended to encourage registered dental hygienists' altruistic expressions. Dental hygienists are frequently unaware of opportunities to volunteer their services and how state practice act regulations impact those opportunities. Copyright © 2015 The American Dental Hygienists’ Association.

  11. Dental Calculus Arrest of Dental Caries

    Science.gov (United States)

    Keyes, Paul H.; Rams, Thomas E.

    2016-01-01

    Background An inverse relationship between dental calculus mineralization and dental caries demineralization on teeth has been noted in some studies. Dental calculus may even form superficial layers over existing dental caries and arrest their progression, but this phenomenon has been only rarely documented and infrequently considered in the field of Cariology. To further assess the occurrence of dental calculus arrest of dental caries, this study evaluated a large number of extracted human teeth for the presence and location of dental caries, dental calculus, and dental plaque biofilms. Materials and methods A total of 1,200 teeth were preserved in 10% buffered formal saline, and viewed while moist by a single experienced examiner using a research stereomicroscope at 15-25× magnification. Representative teeth were sectioned and photographed, and their dental plaque biofilms subjected to gram-stain examination with light microscopy at 100× magnification. Results Dental calculus was observed on 1,140 (95%) of the extracted human teeth, and no dental carious lesions were found underlying dental calculus-covered surfaces on 1,139 of these teeth. However, dental calculus arrest of dental caries was found on one (0.54%) of 187 evaluated teeth that presented with unrestored proximal enamel caries. On the distal surface of a maxillary premolar tooth, dental calculus mineralization filled the outer surface cavitation of an incipient dental caries lesion. The dental calculus-covered carious lesion extended only slightly into enamel, and exhibited a brown pigmentation characteristic of inactive or arrested dental caries. In contrast, the tooth's mesial surface, without a superficial layer of dental calculus, had a large carious lesion going through enamel and deep into dentin. Conclusions These observations further document the potential protective effects of dental calculus mineralization against dental caries. PMID:27446993

  12. Effect of aging on the configurational change of the aortic arch

    Directory of Open Access Journals (Sweden)

    Atsuhiro Kojima

    2016-04-01

    Full Text Available We explored the relationship between aging and the configuration of the aortic arch using computed tomography angiography (CTA. We retrospectively reviewed CTA obtained in 140 cases. The configuration of the aortic arch was categorized into three types based on the criteria mentioned by Madhwal et al., and the relationships between each configuration and patient characteristics were analyzed. Anomalies of the aortic arch were also explored. Twenty patients had a type-1 aortic arch (mean age, 56.1 years, 30 patients had a type-2 aortic arch (mean age, 66.3 years, and 89 patients had a type-3 aortic arch (mean age, 71.7 years. The mean age of patients with a type-3 aortic arch was significantly higher than that of patients with a type-1 aortic arch. No significant correlations between the type of aortic arch and other factors, such as smoking habit, were seen. The configuration of the aortic arch in our study appears to be significantly affected by the age of the patients.

  13. The relationship of forensic odontology with various dental specialties in the articles published in the Journal of Forensic odonto-stomatology from 2005 to 2012

    OpenAIRE

    SHAMIM, Thorakkal

    2015-01-01

    Background: There is a paucity of information about the relationship of forensic odontology with various dental specialties in the articles published in the Journal of Forensic Odonto-Stomatology. This study aimed to find the relationship of forensic odontology with various dental specialties in the articles published in the Journal of Forensic Odonto-Stomatology from 2005 to 2012 over an 8-year period. Methods: Bibliometric analysis was performed using web-based search during December 2013. ...

  14. Relationship between the medial longitudinal arch and the thoracic and lumbar curvatures with the static and dynamic stability in obese females

    Directory of Open Access Journals (Sweden)

    Abbas Rahimi

    2012-07-01

    Full Text Available Background and Aim: Reviewing the literature reveals a possible correlation between the obesity and the potential foot, spine and stability problems. Investigating the important parameters affecting the balance of obese people and prevention from falling are of high importance to reduce the resulting expenditures. This study aimed to assess the acts and the counter acts between the medial longitudinal arch (MLA and the thoracic and lumbar curvatures with the static and dynamic stability in obese females. Materials and Methods: Twenty eight obese females (age= 25±8 years old, BMI=37±4 and twenty nine non-obese females (age= 23±4 years old, BMI=23±3 were recruited in this case-control study with the cross-sectional technique. The MLA, spinal curve angles and the static or dynamic balance index of the subjects were measured using the navicular drop, flexible ruler and Biodex balance system tools, respectively. The static balance test was carried out using a modified Clinical Test of Sensory Interaction and Balance (CTSIB test in both the open and closed eyes while the subjects stood on their dominant legs. The order of the dynamic and static tests was selected randomly.Results: The findings of this study showed that in closed eye condition, most changes happened between the global Stability Index (SI and BMI; while in open eye condition, most changes occurred between the lateral-medial stability index and BMI (r=0.5. Also during an open eye condition, a moderate correlation was found between the navicular drop and lateral-medial stability index (r=0.05. In closed eyes condition, no significant changes were found between the SI and lumbar lordosis (r=0.0004; while a weak correlation was found between the thoracic curve angle and lateral-medial stability index (r=0.04.Conclusion: The dynamic stability is not only correlated to their BMI, but is highly dependent on their foot curvature types and slightly on their thoracic curve angle. Abdominal

  15. Using ArchE in the Classroom: One Experience

    Science.gov (United States)

    2007-09-01

    displaying the new itinerary The team initially adopted the Model-View-Controller ( MVC ) architecture as the top-level architecture . The...CMU/SEI-2007-TN-001 Software Architecture Technology Initiative Unlimited distribution subject to the copyright. This report was prepared...SOFTWARE ENGINEERING INSTITUTE | v vi | CMU/SEI-2007-TN-001 Abstract The Architecture Expert (ArchE) tool serves as a software architecture

  16. Relationship between Frequency of Sugary Food and Drink Consumption with Occurrence of Dental Caries among Preschool Children in Titiwangsa, Kuala Lumpur.

    Science.gov (United States)

    Zahara, A M; Fashihah, M H; Nurul, A Y

    2010-04-01

    Dental caries are attributed to various factors including diet. The present crosssectional study determined the frequency of sugary food and drink consumption and defined its relationship to dental caries among preschool children. A total of 50 preschoolers (aged 5-6 years) in three kindergartens of the Department of Community Development (KEMAS) in Titiwangsa, Kuala Lumpur participated in this study. A set of structured questionnaires was used to assess the frequency of sugary food and drink consumption. Dental check ups were performed by a dentist. The dft index (decayed, filled teeth) was used to describe incidence of caries in subjects. Results showed that 62% of the subjects had dental caries. with the mean dft score being 3.72. The frequency of sugary food consumption by the majority of subjects was 2 times a day, while the frequency of sugary drink consumption was more than 3 times a day. There was no significant relationship between frequency of sugary food and drink consumption with incidence of caries. Subjects with high dft scores were more likely to report dental pain. The prevalence of dental caries in preschoolers in this study was high, indicating a need for effective dental health promotion to improve dental health status of this age group.

  17. Perceptions of Indian dental hygiene students toward their profession and its relationship with their explicit self-esteem scores.

    Science.gov (United States)

    Gupta, Shipra; Jain, Ashish; Garg, Sakshi; Sood, Shaveta; Kumari, Bindiya

    2014-10-01

    The purpose of this study was to investigate the perceptions toward the profession, the level of explicit self-esteem (ESE) of Indian students pursuing the course of dental hygienists, to evaluate the relationship between the two and to develop educational strategies to positively influence students' perceptions. We also wished to evaluate the level of satisfaction of the students to the current status of professional employment in the country. Students in the second year of the dental hygienist 2-year course were asked to participate in a cross-sectional survey study. An instrument was used to obtain students' perceptions about the profession by estimating the dimensions of "Motivation," "Expectation" and "Environment". Their self-esteem was evaluated using the Rosenberg self-esteem scale. Relationship of self esteem scores with perceptions towards profession was then evaluated. Scores for dimensions including "Motivation," "Expectation" and "Environment" were significantly high, as were the self-esteem scores. The level of ESE was positively correlated with their perceptions of the profession. The perception of the Indian dental hygienist students was significantly high and positively correlated to the ESE scores. We also conclude that environmental factors may be more influential than innate cultural factors for the development of self-esteem.

  18. Relationship between hand-skill exercises and other admissions criteria and students' performance in dental school.

    Science.gov (United States)

    Ballard, Richard W; Hagan, Joseph L; Cheramie, Toby

    2015-05-01

    The aim of this study was to investigate the existence of correlations between dental admissions criteria, including a chalk carving exercise, and students' subsequent academic performance. The retrospective cohort study examined the records of dental students at Louisiana State University Health Science Center School of Dentistry for the years 1998 to 2008. Only those students who could be categorized into the following four groups were included: 1) those who graduated in the top 10% of their class, 2) those who graduated in the bottom 10% of their class, 3) those who repeated a year of dental school, and 4) those who were dismissed or resigned. The study sample consisted of 176 students: 62 in the first group, 62 in the second group, 25 in the third group, and 27 in the fourth group. Data collected were each student's undergraduate grade point average (GPA); chalk carving score; undergraduate biology, chemistry, physics (BCP) GPA; Dental Admission Test (DAT) Academic Average; Perceptual Ability Test (PAT) score of the DAT; total DAT score; grade in preclinical operative dentistry class; grade in morphology and occlusion class; and dental school GPA at graduation. The results showed that only the undergraduate GPA and BCP GPA were significantly higher for students in the top 10% of their class than for other groups. The only positive correlation involving the chalk carving scores was with the preclinical operative dentistry course grade. This study thus found limited correlations between this institution's admissions criteria and its students' success in dental school.

  19. AUTHORITARIANISM AND DENTAL CARIES.

    Science.gov (United States)

    in particular. If so, dental decay among nonauthoritarians might well progress further than among authoritarians. To determine whether or not there...is any relationship between dental decay and authoritarianism is the purpose of the present study. (Author)

  20. The relationship between dental status, food selection, nutrient intake, nutritional status, and body mass index in older people

    Directory of Open Access Journals (Sweden)

    Wagner Marcenes

    2003-05-01

    Full Text Available This paper reviewed the findings from a national survey in Great Britain which assessed whether dental status affected older people's food selection, nutrient intake, and nutritional status. The survey analyzed national random samples of free-living and institution subjects for dental examination, interview, and four-day food diary as well as blood and urine tests In the free-living sample, intakes of non-starch polysaccharides, protein, calcium, non-heme iron, niacin, and vitamin C were significantly lower in edentulous as compared to dentate subjects. People with 21 or more teeth consumed more of most nutrients, particularly non-starch polysaccharides. This relationship in intake was not apparent in the hematological analysis. Plasma ascorbate and retinol were the only analytes significantly associated with dental status. Having 21 or more teeth increased the likelihood of having an acceptable body mass index (BMI. Thus, maintaining a natural and functional dentition defined as having more than twenty teeth into old age plays an important role in having a healthy diet rich in fruits and vegetables, a satisfactory nutritional status, and an acceptable BMI.

  1. Relationship between premature loss of primary teeth with oral hygiene, consumption of soft drinks, dental care, and previous caries experience.

    Science.gov (United States)

    López-Gómez, Sandra Aremy; Villalobos-Rodelo, Juan José; Ávila-Burgos, Leticia; Casanova-Rosado, Juan Fernando; Vallejos-Sánchez, Ana Alicia; Lucas-Rincón, Salvador Eduardo; Patiño-Marín, Nuria; Medina-Solís, Carlo Eduardo

    2016-02-26

    We determine the relationship between premature loss of primary teeth and oral hygiene, consumption of soft drinks, dental care and previous caries experience. This study focused on 833 Mexican schoolchildren aged 6-7. We performed an oral examination to determine caries experience and the simplified oral hygiene index. The dependent variable was the prevalence of at least one missing tooth (or indicated for extraction) of the primary dentition; this variable was coded as 0 = no loss of teeth and 1 = at least one lost primary tooth. The prevalence of at least one missing tooth was 24.7% (n = 206) (95% CI = 21.8-27.7). The variables that were associated with the prevalence of tooth loss (p oral hygiene (OR = 3.24), a lower frequency of brushing (OR = 1.60), an increased consumption of soda (OR = 1.89) and use of dental care (curative: OR = 2.83, preventive: OR = 1.93). This study suggests that the premature loss of teeth in the primary dentition is associated with oral hygiene, consumption of soft drinks, dental care and previous caries experience in Mexican schoolchildren. These data provide relevant information for the design of preventive dentistry programs.

  2. Sensitization to palladium and nickel in Europe and the relationship with oral disease and dental alloys

    NARCIS (Netherlands)

    Muris, J.; Goossens, A.; Gonçalo, M.; Bircher, A.J.; Giménez-Arnau, A.; Foti, C.; Rustemeyer, T.; Feilzer, A.J.; Kleverlaan, C.J.

    2015-01-01

    Background The role of palladium and nickel sensitization in oral disease and dermatitis is not fully understood. Objectives To investigate whether sensitization to these metals was associated with exposure to dental alloys and oral and skin complaints/symptoms in a European multicentre study.

  3. The relationship between levels of income inequality and dental caries and periodontal diseases

    Directory of Open Access Journals (Sweden)

    Roger Keller Celeste

    2011-06-01

    Full Text Available The objective of this study was to evaluate the association between income inequality at a lagged time of 2 and 11 years with two short latency outcomes (untreated dental caries and gingivitis and two long latency outcomes (edentulism and periodontal attachment loss > 8mm. We used data from the Brazilian oral health survey in 2002-2003. Our analysis included 13,405 subjects aged 35-44 years. Different lagged Gini at municipal level were fitted using logistic and negative binomial multilevel analyses. Covariates included municipal per capita income, equivalized income, age, sex, time since last dental visit and place of residence (rural versus urban. Crude estimates showed that only untreated dental caries was associated with current and lagged Gini, but in adjusted models only current Gini remained significant with a ratio of 1.19 (95%CI: 1.09-1.30 for every ten-point increase in the Gini coefficient. We conclude that lagged Gini showed no association with oral health; and current income Gini was associated with current dental caries but not with periodontal disease.

  4. Structure–property relationships in hybrid dental nanocomposite resins containing monofunctional and multifunctional polyhedral oligomeric silsesquioxanes

    Science.gov (United States)

    Wang, Weiguo; Sun, Xiang; Huang, Li; Gao, Yu; Ban, Jinghao; Shen, Lijuan; Chen, Jihua

    2014-01-01

    Organic-inorganic hybrid materials, such as polyhedral oligomeric silsesquioxanes (POSS), have the potential to improve the mechanical properties of the methacrylate-based composites and resins used in dentistry. In this article, nanocomposites of methacryl isobutyl POSS (MI-POSS [bears only one methacrylate functional group]) and methacryl POSS (MA-POSS [bears eight methacrylate functional groups]) were investigated to determine the effect of structures on the properties of dental resin. The structures of the POSS-containing networks were determined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. Monofunctional POSS showed a strong tendency toward aggregation and crystallization, while multifunctional POSS showed higher miscibility with the dimethacrylate monomer. The mechanical properties and wear resistance decreased with increasing amounts of MI-POSS, indicating that the MI-POSS agglomerates act as the mechanical weak point in the dental resins. The addition of small amounts of MA-POSS improved the mechanical and shrinkage properties. However, samples with a higher MA-POSS concentration showed lower flexural strength and flexural modulus, indicating that there is a limited range in which the reinforcement properties of MA-POSS can operate. This concentration dependence is attributed to phase separation at higher concentrations of POSS, which affects the structural integrity, and thus, the mechanical and shrinkage properties of the dental resin. Our results show that resin with 3% MA-POSS is a potential candidate for resin-based dental materials. PMID:24550674

  5. Structure-property relationships in hybrid dental nanocomposite resins containing monofunctional and multifunctional polyhedral oligomeric silsesquioxanes.

    Science.gov (United States)

    Wang, Weiguo; Sun, Xiang; Huang, Li; Gao, Yu; Ban, Jinghao; Shen, Lijuan; Chen, Jihua

    2014-01-01

    Organic-inorganic hybrid materials, such as polyhedral oligomeric silsesquioxanes (POSS), have the potential to improve the mechanical properties of the methacrylate-based composites and resins used in dentistry. In this article, nanocomposites of methacryl isobutyl POSS (MI-POSS [bears only one methacrylate functional group]) and methacryl POSS (MA-POSS [bears eight methacrylate functional groups]) were investigated to determine the effect of structures on the properties of dental resin. The structures of the POSS-containing networks were determined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. Monofunctional POSS showed a strong tendency toward aggregation and crystallization, while multifunctional POSS showed higher miscibility with the dimethacrylate monomer. The mechanical properties and wear resistance decreased with increasing amounts of MI-POSS, indicating that the MI-POSS agglomerates act as the mechanical weak point in the dental resins. The addition of small amounts of MA-POSS improved the mechanical and shrinkage properties. However, samples with a higher MA-POSS concentration showed lower flexural strength and flexural modulus, indicating that there is a limited range in which the reinforcement properties of MA-POSS can operate. This concentration dependence is attributed to phase separation at higher concentrations of POSS, which affects the structural integrity, and thus, the mechanical and shrinkage properties of the dental resin. Our results show that resin with 3% MA-POSS is a potential candidate for resin-based dental materials.

  6. Critical Thinking Disposition and Skills in Dental Students: Development and Relationship to Academic Outcomes.

    Science.gov (United States)

    Whitney, Eli M; Aleksejuniene, Jolanta; Walton, Joanne N

    2016-08-01

    Critical thinking is a key element of complex problem-solving and professional behavior. An ideal critical thinking measurement instrument would be able to accurately predict which dental students are predisposed to and capable of thinking critically and applying such thinking skills to clinical situations. The aims of this study were to describe critical thinking disposition and skills in dental students at the beginning and end of their first year, examine cohort and gender effects, and compare their critical thinking test scores to their first-year grades. Volunteers from three student cohorts at the University of British Columbia were tested using the California Critical Thinking Disposition Inventory and California Critical Thinking Skills instruments at the beginning and end of their first year. Based on the preliminary findings, one cohort was retested at graduation when their final-year grades and clinical advisor rankings were compared to their critical thinking test scores. The results showed that students who entered dental school with higher critical thinking scores tended to complete their first year with higher critical thinking scores, achieve higher grades, and show greater disposition to think critically at the start of the program. Students who demonstrated an ability to think critically and had a disposition to do so at the start of the program were also likely to demonstrate those same attributes at the completion of their training. High critical thinking scores were associated with success in both didactic and clinical settings in dental school.

  7. The relationship between levels of income inequality and dental caries and periodontal diseases.

    Science.gov (United States)

    Celeste, Roger Keller; Fritzell, Johan; Nadanovsky, Paulo

    2011-06-01

    The objective of this study was to evaluate the association between income inequality at a lagged time of 2 and 11 years with two short latency outcomes (untreated dental caries and gingivitis) and two long latency outcomes (edentulism and periodontal attachment loss > 8mm). We used data from the Brazilian oral health survey in 2002-2003. Our analysis included 13,405 subjects aged 35-44 years. Different lagged Gini at municipal level were fitted using logistic and negative binomial multilevel analyses. Covariates included municipal per capita income, equivalized income, age, sex, time since last dental visit and place of residence (rural versus urban). Crude estimates showed that only untreated dental caries was associated with current and lagged Gini, but in adjusted models only current Gini remained significant with a ratio of 1.19 (95%CI: 1.09-1.30) for every ten-point increase in the Gini coefficient. We conclude that lagged Gini showed no association with oral health; and current income Gini was associated with current dental caries but not with periodontal disease.

  8. Sensitization to palladium and nickel in Europe and the relationship with oral disease and dental alloys

    NARCIS (Netherlands)

    Muris, J.; Goossens, A.; Gonçalo, M.; Bircher, A.J.; Giménez-Arnau, A.; Foti, C.; Rustemeyer, T.; Feilzer, A.J.; Kleverlaan, C.J.

    2015-01-01

    Background The role of palladium and nickel sensitization in oral disease and dermatitis is not fully understood. Objectives To investigate whether sensitization to these metals was associated with exposure to dental alloys and oral and skin complaints/symptoms in a European multicentre study. Metho

  9. Family relationships as an explanatory variable in childhood dental caries: a systematic review of measures

    NARCIS (Netherlands)

    Duijster, D.; O'Malley, L.O.; Elison, S.; Loveren, C. van; Marcenes, W.; Adair, P.M.; Pine, C.M.

    2013-01-01

    It is widely acknowledged that parental beliefs (self-efficacy) about oral health and parental oral health-related behaviours play a fundamental role in the establishment of preventative behaviours that will mitigate against the development of childhood dental caries. However, little attention has b

  10. Simplified zygomatic arch radiographic technique to overcome the drawback of jug handle view

    Directory of Open Access Journals (Sweden)

    Siddana Gouda Siddana

    2014-01-01

    Full Text Available Introduction: The imaging of the zygomatic arch is very important in the diagnosis and management of zygomatic arch fractures. It is accomplished by jug handle radiography (a variation of the submentovertex view and sometimes with modifications like the tangential or tea cup projection. For these techniques, the patient has to be positioned in a way which makes it non-applicable in cases having cervical injuries or suspected cervical injuries. Aims and Objectives: To devise a new approach with which the image of the zygomatic arch can be obtained with normal head position, in either sitting or supine position, using a dental X-ray machine and an occlusal film, which can even be used in patients with cervical injuries or suspected cervical injuries, without any complications. Materials and Methods: The present approach requires a dental X-ray machine and an occlusal X-ray film thereby eliminating the need for additional equipment like a general X-ray machine and extraoral film cassette. This approach can be carried out in a conventional dental setup to rule out zygomatic arch fractures. Conclusion: This technique can be applied in patients having cervical injuries or suspected cervical injuries, thus overcoming the drawback of the jug handle view, and is easy to master. This technique can be used in a conventional dental setup and holds good with the ALARA (as low as reasonably achievable principle of radiation protection and safety.

  11. Relationship between sponsorship and failure rate of dental implants: a systematic approach.

    Directory of Open Access Journals (Sweden)

    Antoine Popelut

    Full Text Available BACKGROUND: The number of dental implant treatments increases annually. Dental implants are manufactured by competing companies. Systematic reviews and meta-analysis have shown a clear association between pharmaceutical industry funding of clinical trials and pro-industry results. So far, the impact of industry sponsorship on the outcomes and conclusions of dental implant clinical trials has never been explored. The aim of the present study was to examine financial sponsorship of dental implant trials, and to evaluate whether research funding sources may affect the annual failure rate. METHODS AND FINDINGS: A systematic approach was used to identify systematic reviews published between January 1993 and December 2008 that specifically deal with the length of survival of dental implants. Primary articles were extracted from these reviews. The failure rate of the dental implants included in the trials was calculated. Data on publication year, Impact Factor, prosthetic design, periodontal status reporting, number of dental implants included in the trials, methodological quality of the studies, presence of a statistical advisor, and financial sponsorship were extracted by two independent reviewers (kappa = 0.90; CI(95% [0.77-1.00]. Univariate quasi-Poisson regression models and multivariate analysis were used to identify variables that were significantly associated with failure rates. Five systematic reviews were identified from which 41 analyzable trials were extracted. The mean annual failure rate estimate was 1.09%.(CI(95% [0.84-1.42]. The funding source was not reported in 63% of the trials (26/41. Sixty-six percent of the trials were considered as having a risk of bias (27/41. Given study age, both industry associated (OR = 0.21; CI(95% [0.12-0.38] and unknown funding source trials (OR = 0.33; (CI(95% [0.21-0.51] had a lower annual failure rates compared with non-industry associated trials. A conflict of interest statement was disclosed in 2

  12. Structure–property relationships in hybrid dental nanocomposite resins containing monofunctional and multifunctional polyhedral oligomeric silsesquioxanes

    Directory of Open Access Journals (Sweden)

    Wang WG

    2014-02-01

    Full Text Available Weiguo Wang,1,* Xiang Sun,1,* Li Huang,2,* Yu Gao,1 Jinghao Ban,1 Lijuan Shen,1 Jihua Chen1 1Department of Prosthodontics, 2Department of General Dentistry and Emergency, School of Stomatology, Fourth Military Medical University, Xi'an, People's Republic of China*These authors contributed equally to this workAbstract: Organic-inorganic hybrid materials, such as polyhedral oligomeric silsesquioxanes (POSS, have the potential to improve the mechanical properties of the methacrylate-based composites and resins used in dentistry. In this article, nanocomposites of methacryl isobutyl POSS (MI-POSS [bears only one methacrylate functional group] and methacryl POSS (MA-POSS [bears eight methacrylate functional groups] were investigated to determine the effect of structures on the properties of dental resin. The structures of the POSS-containing networks were determined by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. Monofunctional POSS showed a strong tendency toward aggregation and crystallization, while multifunctional POSS showed higher miscibility with the dimethacrylate monomer. The mechanical properties and wear resistance decreased with increasing amounts of MI-POSS, indicating that the MI-POSS agglomerates act as the mechanical weak point in the dental resins. The addition of small amounts of MA-POSS improved the mechanical and shrinkage properties. However, samples with a higher MA-POSS concentration showed lower flexural strength and flexural modulus, indicating that there is a limited range in which the reinforcement properties of MA-POSS can operate. This concentration dependence is attributed to phase separation at higher concentrations of POSS, which affects the structural integrity, and thus, the mechanical and shrinkage properties of the dental resin. Our results show that resin with 3% MA-POSS is a potential candidate for resin-based dental materials

  13. Dental caries and fluorosis prevalence and their relationship with socioeconomic and behavioural variables among 12-year-old schoolchildren.

    Science.gov (United States)

    Benazzi, Aline Sampieri; da Silva, Renato Pereira; de Meneghim, Marcelo; Ambrosano, Gláucia Maria; Pereira, Antonio Carlos

    2012-01-01

    To evaluate caries experience and fluorosis prevalence in 12-year-old schoolchildren in Piracicaba, Brazil in 2007 and to verify the relationship of these changes with socioeconomic and behavioural variables. The sample consisted of 724 schoolchildren from public and private schools. A calibrated dentist performed the examination under natural light using CPI probes and mirrors. The mean number of decayed, missing and filled permanent teeth (DMFT) and the SiC (Significant Caries Index) were determined for dental caries and the Thylstrup and Fejerskov index (T-F) for fluorosis. Socioeconomic and behavioural variables were collected by means of a questionnaire. Multiple logistic regression analyses were performed to verify the relationship of caries and fluorosis with socioeconomic and behavioural variables. The DMFT and SiC indices were 0.85 (±1.54) and 2.52 (±1.72). Fluorosis prevalence was 29.42%. The regression models showed that children whose families earned up to four minimum wages were 2.58 times more prone to having caries than those whose families earned over four minimum wages. Furthermore, children who visited the dentist were 4.27 times more likely to have DMFT > 0. However, for fluorosis, the regression model was not significant. The 12-year-old schoolchildren in Piracicaba presented very low caries prevalence. Significant associations were observed between the presence of caries, monthly family income and visiting the dentist. Considering dental fluorosis, the majority of the sample presented no clinical signs of fluorosis.

  14. A technique to stabilize record bases for Gothic arch tracings in patients with implant-retained complete dentures.

    Science.gov (United States)

    Raigrodski, A J; Sadan, A; Carruth, P L

    1998-12-01

    Clinicians have long expressed concern about the accuracy of the Gothic arch tracing for recording centric relation in edentulous patients. With the use of dental implants to assist in retaining complete dentures, the problem of inaccurate recordings, made for patients without natural teeth, can be significantly reduced. This article presents a technique that uses healing abutments to stabilize the record bases so that an accurate Gothic arch tracing can be made.

  15. Developing professional status: an investigation into the working patterns, working relationships and vision for the future of UK clinical dental technicians.

    Science.gov (United States)

    Leyssen, W; Clark, R K F; Gallagher, J E; Radford, D R

    2013-01-01

    To investigate the working patterns and patient base of registered clinical dental technicians (CDTs); their relationships with dentists and other professionals in the dental team; their willingness to work within the NHS and their expectations for the future as a new professional group. Face-to-face qualitative interviews of registered CDTs, selected because of their geographic representation and mode of working, informed the development of a postal questionnaire survey of all early registrants with the General Dental Council (GDC). The majority of CDTs reported working part-time, often combining clinical practice with their role as a dental technician. They reported both positive and negative working relationships with dentists and dental technicians, demonstrating collaboration and/or competition depending on whether the scope of CDTs was respected and patient care was shared or lost. CDTs role in the NHS was limited because they did not have the status of becoming a recognised provider of dental care. There was a desire to expand their scope of practice in future. CDTs are embracing their new status as an occupational group within dentistry. Core features of becoming a professional group were exhibited including the importance of social and financial status and the need to negotiate their current and future roles in the healthcare system.

  16. Summary of: Developing professional status: an investigation into the working patterns, working relationships and vision for the future of UK clinical dental technicians.

    Science.gov (United States)

    Lambert-Humble, Stephen

    2013-01-01

    To investigate the working patterns and patient base of registered clinical dental technicians (CDTs); their relationships with dentists and other professionals in the dental team; their willingness to work within the NHS and their expectations for the future as a new professional group.Methods Face-to-face qualitative interviews of registered CDTs, selected because of their geographic representation and mode of working, informed the development of a postal questionnaire survey of all early registrants with the General Dental Council (GDC). Results The majority of CDTs reported working part-time, often combining clinical practice with their role as a dental technician. They reported both positive and negative working relationships with dentists and dental technicians, demonstrating collaboration and/or competition depending on whether the scope of CDTs was respected and patient care was shared or lost. CDTs role in the NHS was limited because they did not have the status of becoming a recognised provider of dental care. There was a desire to expand their scope of practice in future. Conclusion CDTs are embracing their new status as an occupational group within dentistry. Core features of becoming a professional group were exhibited including the importance of social and financial status and the need to negotiate their current and future roles in the healthcare system [corrected].

  17. Theory of Arched Structures Strength, Stability, Vibration

    CERN Document Server

    Karnovsky, Igor A

    2012-01-01

    Theory of Arched Structures: Strength, Stability, Vibration presents detailed procedures for analytical analysis of the strength, stability, and vibration of arched structures of different types, using exact analytical methods of classical structural analysis. The material discussed is divided into four parts. Part I covers stress and strain with a particular emphasis on analysis; Part II discusses stability and gives an in-depth analysis of elastic stability of arches and the role that matrix methods play in the stability of the arches; Part III presents a comprehensive tutorial on dynamics and free vibration of arches, and forced vibration of arches; and Part IV offers a section on special topics which contains a unique discussion of plastic analysis of arches and the optimal design of arches.

  18. Relationship between risk assessment and payment models in Swedish Public Dental Service

    DEFF Research Database (Denmark)

    Petersson, Gunnel Hänsel; Twetman, Svante

    2017-01-01

    BACKGROUND: To a) compare risk categories in patients selecting a capitation payment (CP) model with those in fee-for-service (FFS), b) determine the 3-year caries increment in the two groups, and c) compare the amount of delivered preventive care in the two groups. METHODS: A comprehensive risk...... the dental records. RESULTS: More patients in the low risk category preferred the CP model (74% vs. 26%) while >80% with high risk selected FFS. The baseline caries level was significantly higher in the FFS group as well as the 3-year caries increment (1.6 vs. 0.8 DFS: p ... preventive care delivered to each patient was generally lower in the FFS model; it was most frequent among patients with "some" risk in the CP model (83.8%) while the lowest delivery rates were found among low risk patients in the FFS system (32.4%). CONCLUSIONS: Young adults in public dental care with low...

  19. Assessment of genetic relationship between Klebsiella pneumoniae and Klebsiella oxytoca samples isolated from a dental office

    Directory of Open Access Journals (Sweden)

    MV Pimenta-Rodrigues

    2008-01-01

    Full Text Available The present study aimed to analyze the genetic similarity between genomic profiles of thirteen Klebsiella oxytoca and seven Klebsiella pneumoniae samples isolated from two different collections carried out in different places of dental offices. Random amplified polymorphic DNA (RAPD technique and similarity coefficients (calculated by Sorensen-Dice and simple matching were applied to determine their genetic profile of randomic DNA sequences. The majority of the isolates of K. pneumoniae and K. oxytoca presented similar coefficient values (e" 0.80. Thus, it was possible to identify that strain dissemination occurred mainly via the hands of the surgeon-dentists and, finally, to determine the genetic similarity of the strains from dental office environments.

  20. Relationship of periodontal clinical parameters with bacterial composition in human dental plaque.

    Science.gov (United States)

    Fujinaka, Hidetake; Takeshita, Toru; Sato, Hirayuki; Yamamoto, Tetsuji; Nakamura, Junji; Hase, Tadashi; Yamashita, Yoshihisa

    2013-06-01

    More than 600 bacterial species have been identified in the oral cavity, but only a limited number of species show a strong association with periodontitis. The purpose of the present study was to provide a comprehensive outline of the microbiota in dental plaque related to periodontal status. Dental plaque from 90 subjects was sampled, and the subjects were clustered based on bacterial composition using the terminal restriction fragment length polymorphism of 16S rRNA genes. Here, we evaluated (1) periodontal clinical parameters between clusters; (2) the correlation of subgingival bacterial composition with supragingival bacterial composition; and (3) the association between bacterial interspecies in dental plaque using a graphical Gaussian model. Cluster 1 (C1) having high prevalence of pathogenic bacteria in subgingival plaque showed increasing values of the parameters. The values of the parameters in Cluster 2a (C2a) having high prevalence of non-pathogenic bacteria were markedly lower than those in C1. A cluster having low prevalence of non-pathogenic bacteria in supragingival plaque showed increasing values of the parameters. The bacterial patterns between subgingival plaque and supragingival plaque were significantly correlated. Chief pathogens, such as Porphyromonas gingivalis, formed a network with other pathogenic species in C1, whereas a network of non-pathogenic species, such as Rothia sp. and Lautropia sp., tended to compete with a network of pathogenic species in C2a. Periodontal status relates to non-pathogenic species as well as to pathogenic species, suggesting that the bacterial interspecies connection affects dental plaque virulence.

  1. A dose-dependent relationship between mercury exposure from dental amalgams and urinary mercury levels: a further assessment of the Casa Pia Children's Dental Amalgam Trial.

    Science.gov (United States)

    Geier, D A; Carmody, T; Kern, J K; King, P G; Geier, Mark R

    2012-01-01

    Dental amalgams are a commonly used dental restorative material, and amalgams are about 50% mercury (Hg). In our study, urinary Hg levels was examined in children of age 8-18 years, with and without dental amalgam fillings, from a completed clinical trial (parent study) that was designed to evaluate the potential health consequences of prolonged exposure to Hg from dental amalgam fillings. Our study was designed to determine whether there was a significant dose-dependent correlation between increasing Hg exposure from dental amalgams and urinary Hg levels. Hg exposure depends on the size and number of teeth with dental amalgams. Overall, consistent with the results observed in the parent study, there was a statistically significant dose-dependent correlation between cumulative exposure to Hg from dental amalgams and urinary Hg levels, after covariate adjustment. Further, it was observed that urinary Hg levels increased by 18% to 52% among 8 to 18 year old individuals, respectively, with an average exposure to amalgams, in comparison to study subjects with no exposure to amalgams. The results of our study suggest that dental amalgams contribute to ongoing Hg exposure in a dose-dependent fashion.

  2. Relationships between tissue properties and operational parameters of a dental handpiece during simulated cavity preparation.

    Science.gov (United States)

    Sun, Hongyan; Lau, Andrew; Heo, Young C; Lin, Lianshan; Delong, Ralph; Fok, Alex

    2013-01-01

    A preliminary study was conducted on the development of an intelligent dental handpiece with functionality to detect subtle changes in mechanical properties of tooth tissue during milling. Such equipment would be able to adopt changes in cutting parameters and make real-time measurements to avoid tooth tissue damage caused by overexertion and overextension of the cutting tool. A modified dental handpiece, instrumented with strain gauges, microphone, displacement sensor, and air pressure sensor, was mounted to a linear movement table and used to mill three to four cavities in >50 bovine teeth. Extracted sound frequency and density were analyzed along with force, air pressure, and displacement for correlations and trends. Experimental results showed a high correlation (coefficient close to 0.7) between the feed force, the rotational frequency, and the averaged gray scale. These results could form the basis of a feedback control system to improve the safety of dental cutting procedures. This article is written in memory of Dr Hongyan Sun, who passed away in 2011 at a young age of 37.

  3. Arch bridges – unlocking their potential

    OpenAIRE

    Long, Adrian; Nanukuttan, Sreejith

    2016-01-01

    Arch bridges are strong, durable, aesthetically pleasing and require little maintenance but very few have been built since the early 1900s. However, this trend has changed as more than 60 FlexiArch bridges have been installed since the system was launched in 2007. The FlexiArch uses precast concrete voussoirs, requires neither corrodible reinforcement, nor centring, can be installed in hours and is contractor friendly. Details of this innovative method of construction and installation of arch...

  4. Differences between dentitions with palatally and labially located maxillary canines observed in incisor width, dental morphology and space conditions

    DEFF Research Database (Denmark)

    Artmann, L; Larsen, H J; Sørensen, H B;

    2010-01-01

    To analyze the interrelationship between incisor width, deviations in the dentition and available space in the dental arch in palatally and labially located maxillary ectopic canine cases.......To analyze the interrelationship between incisor width, deviations in the dentition and available space in the dental arch in palatally and labially located maxillary ectopic canine cases....

  5. Avaliação da profundidade do palato e das dimensões do arco dentário superior em indivíduos com má oclusão e diferentes tipos faciais Evaluation of palatine depth and dimensions of the upper dental arch in patients with malocclusion and different facial types

    Directory of Open Access Journals (Sweden)

    Andrea Esteves

    2007-01-01

    evaluate palatine depth and dimensions of the upper dental arch in patients with malocclusion and different facial types. METHODS: The sample was constituted of profile cephalograms and dental casts of 135 individuals, 67 females and 68 males, with age between 12 to 21 years and malocclusions: Class I (n = 45, Class II (n = 45 and Class III (n = 45, Angle. The sample was divided in three groups, according to the facial type: brachyfacial (n = 45, mesofacial (n = 45 and dolichofacial (n = 45. The transversal dimensions (intercuspids and inter-first molars distances and upper dental arch length were obtained with auxiliary of digital caliper. In order, to obtain palatine depth measurement was used a special equipment developed and adapted to the digital caliper. RESULTS AND CONCLUSION: Based on our results, we concluded that: (1 no statistically significant differences between these measurements were found considering the facial types, except for the palatine depth, that was smaller in brachyfacial group (18.18mm than dolichofacial group (19.52mm; (2 according to sex, only two variables, the depth palatine and inter-first molar distance, demonstrated statistically significant differences, that appeared to be bigger in males than females; (3 according to the malocclusion, statistically significant differences between these measurements were found only to the upper dental arch length, that was bigger in Class II group (31.23mm than Class III group (29.64mm.

  6. A simplified protocol for the immediate loading of the edentulous arch.

    Science.gov (United States)

    Apfel, Paul S; Kopman, Jeffrey S

    2006-01-01

    Restoring dentitions with dental implants is an extremely gratifying procedure for the dental professional. However, the traditional approach of delayed loading requires surgical, prosthetic and patient management gymnastics, often necessitating extended treatment over one year, with multiple relines of fixed provisional restorations or even long periods with removable prostheses. The purpose of this article is to outline a simplified protocol for the immediate loading of the edentulous arch. By adhering to this protocol, the dental team can provide patients with an immediate functional, esthetic and fixed restoration, thereby avoiding the multitude of issues associated with delayed loading and enhancing patient satisfaction.

  7. Relationship Between Drinking Water Fluoride Levels, Dental Fluorosis, Dental Caries and Associated Risk Factors in 9-12 Years Old School Children of Nelakondapally Mandal of Khammam District, Andhra Pradesh, India: A Cross-sectional Survey.

    Science.gov (United States)

    Shanthi, M; Reddy, B Vishnuvardhan; Venkataramana, V; Gowrisankar, S; Reddy, B V Thimma; Chennupati, Sireesha

    2014-06-01

    The present study was conducted to assess the relationship between drinking water fluoride (F) levels, dental fluorosis and dental caries among 9-12 years old school children of Nelakondapally Mandal, Khammam district, Andhra Pradesh. A cross-sectional analytical study was conducted on 1500 school children aged 9-12 years, selected by stratified random sampling from different areas with different levels of naturally occurring F in drinking water. The children were assessed for dental fluorosis according to WHO basic survey guidelines. The overall oral health status of the child was assessed by decayed missing filled teeth (DMFT)/dmft index. Statistical analysis was done using mean, standard deviation, standard error, Z-test, ANOVA test, and Chi-square test. The results of the present study revealed that the prevalence of fluorosis was 74.9%. Number of children having dental fluorosis was highest in children who consume water from bore wells. Caries prevalence in the study population was about 56.5%. Caries prevalence and mean DMFT/dmft scores were least in children with optimal F areas and highest in children with below optimal F areas. There was moderate prevalence of fluorosis in Nelakondapally Mandal of Khammam district, and caries prevalence is high in areas below optimal F areas. How to cite the article: Shanthi M, Reddy BV, Venkataramana V, Gowrisankar S, Reddy BV, Chennupati S. Relationship between drinking water fluoride levels, dental fluorosis, dental caries and associated risk factors in 9-12 year old school children of Nelakondapally Mandal of Khammam district, Andhra Pradesh, India: A cross-sectional survey. J Int Oral Health 2014;6(3):106-10.

  8. In vitro study of dose-response relationship of fluoride with dental enamel

    Directory of Open Access Journals (Sweden)

    Arthur, Rodrigo Alex et al.

    2007-01-01

    Full Text Available Modelos in vitro para avaliação da reatividade do fluoreto (F devem apresentar resposta dose-efeito. Dessa forma, o objetivo desse estudo foi avaliar a relação dose-resposta do fluoreto presente em solução aquosa com o esmalte dental bovino. Cento e vinte blocos de esmalte bovino (5 × 5 × 2 mm, 60 hígidos e 60 com lesão artificial de cárie, foram submetidos durante 10 minutos à água destilada e deionizada (controle negativo e soluções aquosas contendo 50, 100, 200 ou 400 µg F/mL. Cada grupo experimental recebeu 12 blocos hígidos e 12 blocos com lesão artificial de cárie. Duas camadas consecutivas de esmalte dental foram removidas de todos os blocos dentais por meio de ataque ácido e o fluoreto extraído foi determinado com eletrodo específico. Os resultados de fluoreto incorporado foram expressos em µg por g de esmalte removido, considerando a quantidade total das duas camadas. A incorporação de fluoreto pelo esmalte hígido mostrou uma relação dose-resposta linear (p = 0,0001, enquanto que os blocos com lesão de cárie mostraram relação polinomial quadrática (p < 0,0001. Os resultados sugerem que o modelo in vitro de reatividade empregado no presente estudo é apropriado para avaliar a relação doseresposta entre o fluoreto em solução aquosa e aquele incorporado pelo esmalte dental bovino hígido ou com lesão artificial de cárie.

  9. Assessing the relationship between dental appearance and the potential for discrimination in Ontario, Canada

    Directory of Open Access Journals (Sweden)

    Jamie Moeller

    2015-12-01

    Full Text Available Poor oral health is influenced by a variety of individual and structural factors. It disproportionately impacts socially marginalized people, and has implications for how one is perceived by others. This study assesses the degree to which residents of Canada’s most populated province, Ontario, recognize income-related oral health inequalities and the degree to which Ontarians blame the poor for these differences in health, thus providing an indirect assessment of the potential for prejudicial treatment of the poor for having bad teeth. Data were used from a provincially representative survey conducted in Ontario, Canada in 2010 (n=2006. The survey asked participants questions about fifteen specific conditions (e.g. dental decay, heart disease, cancer for which inequalities have been described in Ontario, and whether participants agreed or disagreed with various statements asserting blame for differences in health between social groups. Binary logistic regression was used to determine whether assertions of blame for differences in health are related to perceptions of oral health conditions. Oral health conditions are more commonly perceived as a problem of the poor when compared to other diseases and conditions. Among those who recognize that oral conditions more commonly affect the poor, particular socioeconomic and demographic characteristics predict the blaming of the poor for these differences in health, including sex, age, education, income, and political voting intention. Social and economic gradients exist in the recognition of, and blame for, oral health conditions among the poor, suggesting a potential for discrimination amongst socially marginalized groups relative to dental appearance. Expanding and improving programs that are targeted at improving the oral and dental health of the poor may create a context that mitigates discrimination.

  10. Changes in skeletal and dental relationship in Class II Division I malocclusion after rapid maxillary expansion: a prospective study

    Directory of Open Access Journals (Sweden)

    Carolina Baratieri

    2014-06-01

    Full Text Available OBJECTIVE: To assess skeletal and dental changes immediately after rapid maxillary expansion (RME in Class II Division 1 malocclusion patients and after a retention period, using cone beam computed tomography (CBCT imaging. METHODS: Seventeen children with Class II, Division 1 malocclusion and maxillary skeletal transverse deficiency underwent RME following the Haas protocol. CBCT were taken before treatment (T1, at the end of the active expansion phase (T2 and after a retention period of 6 months (T3. The scanned images were measured anteroposteriorly (SNA, SNB, ANB, overjet and MR and vertically (N-ANS, ANS-Me, N-Me and overbite. RESULTS: Significant differences were identified immediately after RME as the maxilla moved forward, the mandible moved downward, overjet increased and overbite decreased. During the retention period, the maxilla relapsed backwards and the mandible was displaced forward, leaving patients with an overall increase in anterior facial height. CONCLUSION: RME treatment allowed more anterior than inferior positioning of the mandible during the retention period, thus significantly improving Class II dental relationship in 75% of the patients evaluated.

  11. Changes in skeletal and dental relationship in Class II Division I malocclusion after rapid maxillary expansion: a prospective study.

    Science.gov (United States)

    Baratieri, Carolina; Alves, Matheus; Bolognese, Ana Maria; Nojima, Matilde C G; Nojima, Lincoln I

    2014-01-01

    To assess skeletal and dental changes immediately after rapid maxillary expansion (RME) in Class II Division 1 malocclusion patients and after a retention period, using cone beam computed tomography (CBCT) imaging. Seventeen children with Class II, Division 1 malocclusion and maxillary skeletal transverse deficiency underwent RME following the Haas protocol. CBCT were taken before treatment (T1), at the end of the active expansion phase (T2) and after a retention period of 6 months (T3). The scanned images were measured anteroposteriorly (SNA, SNB, ANB, overjet and MR) and vertically (N-ANS, ANS-Me, N-Me and overbite). Significant differences were identified immediately after RME as the maxilla moved forward, the mandible moved downward, overjet increased and overbite decreased. During the retention period, the maxilla relapsed backwards and the mandible was displaced forward, leaving patients with an overall increase in anterior facial height. RME treatment allowed more anterior than inferior positioning of the mandible during the retention period, thus significantly improving Class II dental relationship in 75% of the patients evaluated.

  12. Cambios esqueléticos, dentales y faciales de la maloclusión clase III esquelética tratada con la filosofía de MEAW (Multiloop Edgewise Arch Wire: descriptivo restrospectivo

    Directory of Open Access Journals (Sweden)

    Ángela Anyur García Bernal

    2012-11-01

    Full Text Available Antecedentes: uno de los problemas más complejos del diagnósticoy tratamiento de las maloclusiones lo constituye la corrección de laclase III esquelética. Objetivo: determinar los cambios esqueléticos,dentales y faciales de la maloclusión clase III esquelética tratadacon la filosofía Edgewise Multiloop (MEAW, en pacientes queasistieron a una clínica odontológica privada entre marzo de 2009a septiembre de 2012. Métodos: se realizó un estudio descriptivoretrospectivo, donde se analizaron los registros clínicos de sietepacientes con diagnóstico de maloclusión clase III esquelética.Se evaluaron las variables edad, género, medidas cefalométricasiniciales y finales en radiografías y fotografías laterales. Resultados:los pacientes de ángulo alto fueron 60% mujeres, con edad mediade 21,8 años (DE± 7,25. El ángulo de la convejidad pasó de 10,58° a16,4°; el Indicador de Displasia Antero-Posterior (APDI disminuyóde 96,7° a 91,0°; el Plano Palatino (PP aumentó de 114,3°a 115,4° yel plano oclusal aumentó la inclinación de 17,8°a 24,7°. El promediode tiempo en el tratamiento fue de 19,4 meses. Conclusiones: lafilosofía MEAW es una alternativa terapéutica de camuflaje en eltratamiento de las maloclusiones clase III esquelética.

  13. ON THE CYTOTOXICITY OF ORTHODONTIC ARCHES IN HUMAN FIBROBLAST CULTURES

    Directory of Open Access Journals (Sweden)

    Liliana-Gabriela HALIŢCHI

    2015-12-01

    Full Text Available The present study analyzes the orthodontic nickel-titanium alloy with orthodontic shape memory (Niti GAC arches, Nitinol 3M arches, Beta Titanium 3M arches from the viewpoint of its cytotoxicity. Apart from the intrinsic toxicity of the metals upon cells, corrosion may dramatically alter the behaviour of alloys, as evidenced by the in vitro and in vivo studies developed in the field. Due to the high and variable nickel content, its is possible that, at least theoretically, the released ions should produce – as a result of intraoral corrosion – secondary effects, which makes necessary to assert the cytotoxicity of NiTi alloys prior to their safe utilizationor in the oral cavity of children and young patients. Evaluation of cell morphology and determination of cell viability, following exposure to the 3 types of orthodontic materials, evidenced no toxic reactions. Several problems are still to be elucidated, related to the consequences of the surface conditions, of the dissolution and in vivo release of the nickel ions after a longer treatment, of the accumulations of ion traces, of the response of the dental-periodontal tissues, of the effects manifested at cell and molecular level. Apart from the intrisic toxicity of metals upon cells, corrosion may dramatically influence the behaviour of alloys under in vitro conditions, comparatively with the in vivo ones, the nitinol samples being biologically safe.

  14. Relationship between quantitative measurement of Porphyromonas gingivalis on dental plaque with periodontal status of patients with coronary heart disease

    Science.gov (United States)

    Dwiyanti, Stephani; Soeroso, Yuniarti; Sunarto, Hari; Radi, Basuni

    2017-02-01

    Coronary heart disease is a narrowing of coronary artery due to plaque build-up. [1] Chronic periodontitis increases risk of cardiovascular disease. P.gingivalis is linked to both diseases. Objective: to analyse quantitative difference of P.gingivalis on dental plaque and its relationship with periodontal status of CHD patient and control. Methods: Periodontal status of 66 CHD patient and 40 control was checked. Subgingival plaque was isolated and P.gingivalis was measured using real-time PCR. Result: P.gingivalis of CHD patient differs from control. P.gingivalis is linked to pocket depth of CHD patient. Conclusion: P.gingivalis count of CHD patient is higher than control. P.gingivalis count is not linked to any periodontal status, except for pocket depth of CHD patient.

  15. Progress of researches on relationship of bacterial biofilm and dental caries%细菌生物膜与龋齿相关性的研究进展

    Institute of Scientific and Technical Information of China (English)

    张欣然; 刘新

    2011-01-01

    Dental plaque biofilm is a combination of micro-organisms deposited on tooth sturface, with concentration of organic substrates with each other, cross-linked to form the ecological structure. Microbial biofilms are interdependent and mutually competitive, constitute a complex micro-ecological relationships. Bacteria in dental plaque biofilm formation is gathered in the tooth surface structures necessary to lead to dental caries. This paper reviews the relationship between the occurrence of bacterial biofilms and dental caries, in order to provide new ideas for the prevention and treatment of dental caries.%牙菌斑是由多种微生物在牙面上沉积,有机基质互相集聚、交联而形成的生物膜结构,生物膜中微生物相互依存、相互竞争,构成了复杂的微生态关系.牙菌斑生物膜的形成是导致龋齿重要过程.本文综述了细菌生物膜与龋齿发生的关系,以期为龋齿的预防与治疗提供新的思路.

  16. Dental Fluorosis

    Science.gov (United States)

    ... have been broadly termed dental fluorosis. What is dental fluorosis? Dental fluorosis is a condition that causes ... less than 2 milligrams per liter. What causes dental fluorosis? Dental fluorosis is caused by taking in ...

  17. Dental Amalgam

    Science.gov (United States)

    ... Products and Medical Procedures Dental Devices Dental Amalgam Dental Amalgam Share Tweet Linkedin Pin it More sharing options Linkedin Pin it Email Print Dental amalgam is a dental filling material which is ...

  18. Micronutrients Fe, Zn and Ca and their relationship with anthropometric indices and dental health among children

    Directory of Open Access Journals (Sweden)

    Pourhashemi S.J.

    2008-06-01

    Full Text Available Background: Proper nutrition has an important role in the physical and psychological development of children. The aim of this survey is to compare the nutrition of a community to the recommended daily amount (RDA to determine deficiencies and present recommendations for improvement.Methods: In this cross-sectional study conducted in Tehran, Iran, 788 children, all seven years of age, were selected via cluster sampling and evaluated using standard questionnaires with a 24-hr recall regarding the frequency and type of food intake. Then by measurement of weight and height, their anthropometric and DMFT (decayed/missing/filled teeth indices were determined using the Kruskal-Wallis one-way analysis of variance, and Mann-Whitney U and chi-square tests.Results: Relative to the RDA, 23.6% of children had low intake of Ca, and 3.2% and 5.2% were deficient for Fe and Zn, respectively. Anthropometric measurements showed that 15.7% were malnourished based on weight for age, 10.5% based on height for age and 16.8% based on weight for height indices. The DMFT indices for children with dietary Ca levels under 75% of the RDA were significantly higher than those with sufficient Ca intake (P<0.001. The mean DMFT indices for dental development were 0.22 for permanent teeth (four molars; SD=0.64 and 4.64 for primary teeth (SD=3.24. We found a significant correlation between DMFT indices and low Fe intake: the DMFT indices of children with iron deficiency were much higher than those with sufficient iron intake.Conclusions: Children in Tehran do not receive enough Ca Fe and Zn from their diets. This problem causes mild malnutrition and increases the risk of dental caries.

  19. The relationship between dental caries and obesity among primary school children aged 5 to 14 years

    Directory of Open Access Journals (Sweden)

    Yao Yingshui

    2014-07-01

    Full Text Available Background: Previous study revealed that the link between dental caries and obesity has been controversial. The purpose of this research is to investigate the association between dental caries and obesity among primary school children in Wannan area, China. Methods: A cross-sectional study was designed to collect the routine health screening data for primary school children aged 5-14 years inWannan area,China, Overweight and obesity status were determined using the International Obesity Task Force standard (IOTF BMI cut-off points. Caries status was recorded based on WHO recommendations. Results: Our results revealed that the overall caries prevalence of the subjects was 44.9%, Maximum number of caries affected children belonged to underweight and normal group, followed by overweight, and the least number was obesity. These differences were statistically significant (chi-square test, P < 0.001. Children with obesity were 1.908 times (OR =1.908; CI95%=1.750, 2.079 more likely have caries than children with underweight or health weight. Overweight children were 1.547 times (OR = 1.547; CI95% = 1.479, 1.618 more likely to have caries than children with underweight or health weight. After adjusted the gender and age, a statistically significant association was also observed between body mass index categories and caries. Conclusions: Obesity may have a significant effect on caries prevalence of primary school children in Wannan area, China. The importance of obesity should not only be emphasized with respect to general diseases but also with regard to carious lesions.

  20. The relationship between dental caries and obesity among primary school children aged 5 to 14 years.

    Science.gov (United States)

    Yao, Yingshui; Ren, Xiaohua; Song, Xiuli; He, Lianping; Jin, Yuelong; Chen, Yan; Lu, Wei; Guo, Daoxia; Ding, Lingling; Tang, Hui; Wei, Ningkai; Qiu, Shenwei; Li, Chaopin

    2014-07-01

    Previous study revealed that the link between dental caries and obesity has been controversial. The purpose of this research is to investigate the association between dental caries and obesity among primary school children in Wannan area, China. A cross-sectional study was designed to collect the routine health screening data for primary school children aged 5-14 years in Wannan area,China, Overweight and obesity status were determined using the International Obesity Task Force standard (IOTF) BMI cut-off points. Caries status was recorded based on WHO recommendations. Our results revealed that the overall caries prevalence of the subjects was 44.9%, Maximum number of caries affected children belonged to underweight and normal group, followed by overweight, and the least number was obesity. These differences were statistically significant (chi-square test, P Children with obesity were 1.908 times (OR =1.908; CI95%=1.750, 2.079) more likely have caries than children with underweight or health weight. Overweight children were 1.547 times (OR = 1.547; CI95% = 1.479, 1.618) more likely to have caries than children with underweight or health weight. After adjusted the gender and age, a statistically significant association was also observed between body mass index categories and caries. Obesity may have a significant effect on caries prevalence of primary school children in Wannan area, China. The importance of obesity should not only be emphasized with respect to general diseases but also with regard to carious lesions. Copyright AULA MEDICA EDICIONES 2014. Published by AULA MEDICA. All rights reserved.

  1. The relationship of forensic odontology with various dental specialties in the articles published in the Journal of Forensic odonto-stomatology from 2005 to 2012.

    Science.gov (United States)

    Shamim, Thorakkal

    2015-01-01

    There is a paucity of information about the relationship of forensic odontology with various dental specialties in the articles published in the Journal of Forensic Odonto-Stomatology. This study aimed to find the relationship of forensic odontology with various dental specialties in the articles published in the Journal of Forensic Odonto-Stomatology from 2005 to 2012 over an 8-year period. Bibliometric analysis was performed using web-based search during December 2013. Out of the total 97 published articles, the maximum number of published articles were related to oral medicine and radiology (20) and community dentistry (20), followed by orthodontics (18), prosthodontics (15), and oral pathology and microbiology (8), pedodontics (7), oral and maxillofacial surgery (4) and conservative dentistry and endodontics (3). Among the articles published in Journal of Forensic Odonto-Stomatology, mass disasters (10) and bite mark analysis (10), followed by sexual dimorphism (8) and dental fraud and malpractice (8), followed by craniofacial superimposition (6) and identification (6) form the major attraction of the contributors. This paper has tried to evaluate the new working classification proposed for forensic odontology based on its relationship with other dental specialties.

  2. A cone-beam CT based technique to augment the 3D virtual skull model with a detailed dental surface.

    Science.gov (United States)

    Swennen, G R J; Mommaerts, M Y; Abeloos, J; De Clercq, C; Lamoral, P; Neyt, N; Casselman, J; Schutyser, F

    2009-01-01

    Cone-beam computed tomography (CBCT) is used for maxillofacial imaging. 3D virtual planning of orthognathic and facial orthomorphic surgery requires detailed visualisation of the interocclusal relationship. This study aimed to introduce and evaluate the use of a double CBCT scan procedure with a modified wax bite wafer to augment the 3D virtual skull model with a detailed dental surface. The impressions of the dental arches and the wax bite wafer were scanned for ten patient separately using a high resolution standardized CBCT scanning protocol. Surface-based rigid registration using ICP (iterative closest points) was used to fit the virtual models on the wax bite wafer. Automatic rigid point-based registration of the wax bite wafer on the patient scan was performed to implement the digital virtual dental arches into the patient's skull model. Probability error histograms showed errors of wax bite wafer to set-up a 3D virtual augmented model of the skull with detailed dental surface.

  3. 人格特征及认知风格与口腔门诊患者牙科焦虑症的关系%Relationship between Personality Traits and Cognitive Styles with Dental Anxiety in Dental Clinic Patients

    Institute of Scientific and Technical Information of China (English)

    王艳

    2014-01-01

    Objective To investigate the incidence of dental anxiety and the relationship between personality traits and cognitive styles with dental anxiety .Methods 150 dental clinic patients were investigated with the modified dental anxiety scale , Eysenck person-ality questionnaire and the cognitive style of the embedded figure test .Results In all 113 valid samples ,74 .3%of patients had dental anxiety.The score of dental anxiety in field -dependence group (13.041 ±1.829) was significantly higher than that in the field -inde-pendence group(9.41 ±3.165),the difference was statistically significant (t=5.159,P<0.01).Correlation analysis revealed that neuroticism of personality questionnaire was significantly correlated with dental anxiety (r=0.402),but extroversion was negatively corre-lated with dental anxiety(r=-0.302),correlations were all statistically significant (P<0.01).There was also a significantly negative correlation between cognitive style and the score of dental anxiety (r=0.485,P<0.01).The results of regression analysis showed that neuroticism and cognitive style were the significant predictors of dental anxiety .Conclusion The occurrence rate of dental anxiety in o-ral clinic patients is high ,and personality and cognitive styles are important factors which have an important effect on dental anxiety .%目的:调查口腔门诊患者牙科焦虑症的发生情况,研究人格特征及认知风格与牙科焦虑的关系。方法选用改良牙科焦虑量表、艾森克人格问卷以及认知方式镶嵌图形测验对150名口腔门诊患者进行问卷调查。结果113名有效样本中,74.3%的患者有牙科焦虑的产生。场依存组牙科焦虑得分(13.041±1.829)显著高于场依存组(9.41±3.165),差异具有统计学意义(t=5.159,P<0.01)。相关分析结果显示,人格问卷中的神经质与牙科焦虑呈显著正相关(r=0.402),内外倾与牙科焦虑呈显著负相关(r=-0

  4. [Relationship between tobacco smoke and dental caries in school children at the Valencian Country].

    Science.gov (United States)

    Carbajosa García, Smara; Llena Puy, Carmen

    2011-01-01

    Recently, it has focused the role of exposure to environmental tobacco smoke in the etiology of dental caries, so we plan to evaluate the association between environmental tobacco smoke inhalation and caries experience in 10-15-years-old children. A transversal descriptive study was designed. Carried out in the Primary Dentistry Unit. 9th Health Department. Valencian Country (Spain). 380 children random sample was selected (following the inclusion criteria). Each participant was clinically explored, then answered a self-administered opinion test about contact with tobacco smoke. DMF-T and df-t indexes and their components, plaque and gingival indexes, contact with tobacco smoke frequency (at home or not), own opinion about tobacco effects and present or future tobacco consumption. Children living with smokers at home showed a decayed teeth average of 1,9 ± 2,34, while those not living with smokers had 1,03 ± 1,46 ( p<0,001). df and DMF average indexes for children exposed and not exposed to tobacco smoke were 0,27 ± 0,78 (df)and 1,62 ± 2,21 (DMF) and 0,10 ± 0,47 (df) and 0,92 ± 1,40 (DMF) respectively (p=0,039 y p<0,001). In our study conditions, coexistence with environmental tobacco smoke is associated with a higher caries prevalence in both deciduous and permanent dentitions in 10-15-years-old children.

  5. Revisiting impressions using dual-arch trays.

    Science.gov (United States)

    Small, Bruce W

    2012-01-01

    Making routine perfect impressions is the goal of any restorative dentist. Using dual-arch trays is an easy, repeatable way to accomplish that goal, as long as each step is done before the next and each step is performed perfectly. This column reviewed several articles that support the metal dual-arch concept and provided some clinical tips that might help restorative dentists. The dual-arch technique does have its limits and is meant for one or two teeth in a quadrant when there are other teeth to occlude with. Also, if the case involves anterior guidance, a full-arch impression maybe advisable.

  6. Relationship between psychological well-being and perceptions of stress among undergraduate dental students in Bengaluru city: A cross-sectional study

    Directory of Open Access Journals (Sweden)

    M Anushri

    2014-01-01

    Full Text Available Introduction: The dental profession has been considered a stressful occupation. The origins of this stress may also lie in the process of dental education. The perception of stress is frequently influenced by one′s personal system of beliefs and attitudes. Aim: The aim was to assess the relationship between psychological well-being and perception of stress among undergraduate dental students in Bangalore city. Materials and Methods: A cross-sectional questionnaire survey was conducted among 800 1-4 th year dental students. Information on demographics, social background, and health behaviors were collected. The psychological general well-being (PGWB index and the dental environment stress (DES questionnaire were used to measure PGWB and perceptions of stress, respectively. Multiple intergroup comparisons were carried out using ANOVA. Correlation analysis was done to find out relationship between PGWB and DES. Regression analysis to find out the strongest predictor of PGWB. P <0.05 was considered as statistically significant. Results: There was no significant difference in PGWB among different year of study. Female students had significantly lower PGWB scores and higher DES scores than male students. The stress differed among different year of study with highest stress in final year students in all domains except for clinical/preclinical training, which was highest among 1 st year students. Correlational analysis showed a negative relationship between PGWB and DES score. Stepwise multiple regression analysis revealed that "workload," "patient treatment," "performance pressure" and "others" domains of stress were significant predictors of PGWB. Conclusion: This study revealed that the perception of stress is influenced by gender and health behaviors which in turn affect PGWB.

  7. Dynamic stability analysis of circular arch subjected to follower forces with small disturbances; Judo kaju wo ukeru enkei arch no yuran ni yoru doteki kyodo to anteisei kaiseki

    Energy Technology Data Exchange (ETDEWEB)

    Fukuchi, N.; Okada, K. [Kyushu University, Fukuoka (Japan). Faculty of Engineering; Hirano, Y. [Sumitomo Heavy Industries, Ltd., Tokyo (Japan)

    1997-09-04

    This paper describes the deformation and dynamic stability of circular arch subjected to follower forces in a submerged membrane type marine structure reinforced by arch frames. Governing equations for finite deformations of the circular arch subjected to follower forces are introduced using an embedded curve coordinate, which are formulated by applying Galerkin method. In addition, equations of motion due to small disturbances under given condition of loading are introduced. Based on these equations, dynamic stability of the arch is analyzed by means of Runnge-Kutta-Gill method, to clarify the relationship between disturbances and instability regions and the resulting phenomena. Near the boundary regions of stability, both amplitude and cycle of deformation are greatly affected by the amplitude of disturbances. The dynamic instability is governed by the inverse symmetry primary mode with minimum characteristic frequency which is specific for the circular arch. The dynamic stability has high parameter dependency, and the instability regions have a complicated shapes. Although flattened arch has a smaller static critical load, it provides the dynamic stability against the disturbance. 5 refs., 10 figs.

  8. Fixation of a severely resorbed mandible for complete arch screw-retained rehabilitation: A clinical report.

    Science.gov (United States)

    Fabris, Vinicius; Bacchi, Atais

    2016-05-01

    Severely resorbed mandibles with placed endosteal dental implants can fracture. Therefore, techniques to reduce the risk or minimize the consequences of these fractures are needed. This clinical report presents a technique for placing a titanium plate in a severely resorbed mandible subjected to complete-arch implant therapy. The titanium plate is placed in the same surgical procedure as the implants, allowing immediate implant loading. This technique provides safe implant-supported treatment for patients with severe mandibular resorption.

  9. Clinical trial investigating success rates for polyether and vinyl polysiloxane impressions made with full-arch and dual-arch plastic trays.

    Science.gov (United States)

    Johnson, Glen H; Mancl, Lloyd A; Schwedhelm, E Ricardo; Verhoef, Douglas R; Lepe, Xavier

    2010-01-01

    Success rates for making fixed prosthodontic impressions based on material and tray selection are not known. The purpose of this clinical study was to compare first impression success rates for 2 types of impression material and 2 impression tray systems. Dual-viscosity impressions were made with a vinyl polysiloxane (VPS) (Aquasil Ultra Monophase/Aquasil Ultra XLV) and a polyether (PE) (Impregum Penta Soft HB/Impregum Garant Soft LB) impression material. The first impression made was evaluated for success or failure using developed criteria. Fifty senior dental students participated. The type of impression material alternated for each new patient. A full-arch perforated plastic (President Tray) or a plastic dual-arch impression tray (Tri-Bite) was used based on clinical guidelines. Impression success rates were compared using logistic regression, fitted using the method of generalized estimating equations (alpha=.05). One hundred ninety-one impressions were evaluated, and the overall success rate was 61% for VPS and 54% for PE (P=.39). Additional regression analyses, adjusted for potential confounders, did not indicate a difference between the 2 systems (P=.35). There was little difference in success rates between the 2 materials when a full-arch tray was used (50% versus 49% success, P=.89), whereas a larger difference was apparent with the use of dual-arch trays (70% success with VPS versus 58% success with PE, P=.21). The most common critical defect was located on the preparation finish line (94%), and the most common operator error was inadequate gingival displacement (15%). There was little difference in success rates between VPS and PE when full-arch impression trays were used, but there was greater success when using VPS with dual-arch trays. For single teeth, the trend favored VPS, but when more than one prepared tooth per impression was involved, the success rate was higher for PE. Copyright 2010 The Editorial Council of the Journal of Prosthetic

  10. 3D space analysis of dental models

    Science.gov (United States)

    Chuah, Joon H.; Ong, Sim Heng; Kondo, Toshiaki; Foong, Kelvin W. C.; Yong, Than F.

    2001-05-01

    Space analysis is an important procedure by orthodontists to determine the amount of space available and required for teeth alignment during treatment planning. Traditional manual methods of space analysis are tedious and often inaccurate. Computer-based space analysis methods that work on 2D images have been reported. However, as the space problems in the dental arch exist in all three planes of space, a full 3D analysis of the problems is necessary. This paper describes a visualization and measurement system that analyses 3D images of dental plaster models. Algorithms were developed to determine dental arches. The system is able to record the depths of the Curve of Spee, and quantify space liabilities arising from a non-planar Curve of Spee, malalignment and overjet. Furthermore, the difference between total arch space available and the space required to arrange the teeth in ideal occlusion can be accurately computed. The system for 3D space analysis of the dental arch is an accurate, comprehensive, rapid and repeatable method of space analysis to facilitate proper orthodontic diagnosis and treatment planning.

  11. The Relationship between Biofilm and Physical-Chemical Properties of Implant Abutment Materials for Successful Dental Implants.

    Science.gov (United States)

    de Avila, Erica Dorigatti; de Molon, Rafael Scaf; Vergani, Carlos Eduardo; de Assis Mollo, Francisco; Salih, Vehid

    2014-05-07

    The aim of this review was to investigate the relationship between biofilm and peri-implant disease, with an emphasis on the types of implant abutment surfaces. Individuals with periodontal disease typically have a large amount of pathogenic microorganisms in the periodontal pocket. If the individuals lose their teeth, these microorganisms remain viable inside the mouth and can directly influence peri-implant microbiota. Metal implants offer a suitable solution, but similarly, these remaining bacteria can adhere on abutment implant surfaces, induce peri-implantitis causing potential destruction of the alveolar bone near to the implant threads and cause the subsequent loss of the implant. Studies have demonstrated differences in biofilm formation on dental materials and these variations can be associated with both physical and chemical characteristics of the surfaces. In the case of partially edentulous patients affected by periodontal disease, the ideal type of implant abutments utilized should be one that adheres the least or negligible amounts of periodontopathogenic bacteria. Therefore, it is of clinically relevance to know how the bacteria behave on different types of surfaces in order to develop new materials and/or new types of treatment surfaces, which will reduce or inhibit adhesion of pathogenic microorganisms, and, thus, restrict the use of the abutments with indication propensity for bacterial adhesion.

  12. The Relationship between Biofilm and Physical-Chemical Properties of Implant Abutment Materials for Successful Dental Implants

    Directory of Open Access Journals (Sweden)

    Erica Dorigatti de Avila

    2014-05-01

    Full Text Available The aim of this review was to investigate the relationship between biofilm and peri-implant disease, with an emphasis on the types of implant abutment surfaces. Individuals with periodontal disease typically have a large amount of pathogenic microorganisms in the periodontal pocket. If the individuals lose their teeth, these microorganisms remain viable inside the mouth and can directly influence peri-implant microbiota. Metal implants offer a suitable solution, but similarly, these remaining bacteria can adhere on abutment implant surfaces, induce peri-implantitis causing potential destruction of the alveolar bone near to the implant threads and cause the subsequent loss of the implant. Studies have demonstrated differences in biofilm formation on dental materials and these variations can be associated with both physical and chemical characteristics of the surfaces. In the case of partially edentulous patients affected by periodontal disease, the ideal type of implant abutments utilized should be one that adheres the least or negligible amounts of periodontopathogenic bacteria. Therefore, it is of clinically relevance to know how the bacteria behave on different types of surfaces in order to develop new materials and/or new types of treatment surfaces, which will reduce or inhibit adhesion of pathogenic microorganisms, and, thus, restrict the use of the abutments with indication propensity for bacterial adhesion.

  13. Persistent fifth arch anomalies - broadening the spectrum to include a variation of double aortic arch vascular ring

    Energy Technology Data Exchange (ETDEWEB)

    Newman, Beverley; Chan, Frandics [Stanford Children' s Hospital and Stanford University, Department of Radiology, Stanford, CA (United States); Hanneman, Kate [University of Toronto, Department of Medical Imaging, Toronto, ON (Canada)

    2016-12-15

    Fifth arch anomalies are rare and complex and frequently misdiagnosed or mistaken for other entities. We report a double arch vascular ring that is thought to consist of right fourth arch and left fifth arch components, a previously undescribed persistent fifth arch variant. The currently recognized spectrum and classification of fifth arch vascular anomalies are expanded along with illustrative images to justify the proposed changes. Reviewing and expanding the classification of fifth arch anomalies to include a double arch ring variant will promote recognition, correct diagnosis and appropriate management of these anomalies. (orig.)

  14. Nonlinear Dynamics of Electrostatically Actuated MEMS Arches

    KAUST Repository

    Al Hennawi, Qais M.

    2015-05-01

    In this thesis, we present theoretical and experimental investigation into the nonlinear statics and dynamics of clamped-clamped in-plane MEMS arches when excited by an electrostatic force. Theoretically, we first solve the equation of motion using a multi- mode Galarkin Reduced Order Model (ROM). We investigate the static response of the arch experimentally where we show several jumps due to the snap-through instability. Experimentally, a case study of in-plane silicon micromachined arch is studied and its mechanical behavior is measured using optical techniques. We develop an algorithm to extract various parameters that are needed to model the arch, such as the induced axial force, the modulus of elasticity, and the initially induced initial rise. After that, we excite the arch by a DC electrostatic force superimposed to an AC harmonic load. A softening spring behavior is observed when the excitation is close to the first resonance frequency due to the quadratic nonlinearity coming from the arch geometry and the electrostatic force. Also, a hardening spring behavior is observed when the excitation is close to the third (second symmetric) resonance frequency due to the cubic nonlinearity coming from mid-plane stretching. Then, we excite the arch by an electric load of two AC frequency components, where we report a combination resonance of the summed type. Agreement is reported among the theoretical and experimental work.

  15. Relationship of hyposalivation and xerostomia in Mexican elderly with socioeconomic, sociodemographic and dental factors

    Science.gov (United States)

    Islas-Granillo, Horacio; Borges-Yáñez, Aida; Fernández-Barrera, Miguel Ángel; Ávila-Burgos, Leticia; Patiño-Marín, Nuria; Márquez-Corona, María de Lourdes; Mendoza-Rodríguez, Martha; Medina-Solís, Carlo Eduardo

    2017-01-01

    We determined the prevalence of hyposalivation and xerostomia in older Mexicans (≥60 years), and its relationship with diverse factors. A cross-sectional study was realized in elderly subjects from Pachuca, Mexico. Chewing-stimulated saliva was collected under standardized conditions and salivary flow was measured; subjects were considered to have hyposalivation if their stimulated salivary flow was less than 0.7 mL per minute. Xerostomia was evaluated by asking subjects ‘Does your mouth feel dry?’. Hyposalivation was present in 59.7%, and xerostomia in 25.2% of subjects. 16.5% of subjects had both conditions. Xerostomia was present in 27.7% of subjects with hyposalivation and 21.4% of subjects without hyposalivation, but the difference was not significant (p > 0.05). Thus, 68.3% of older Mexicans had xerostomia and/or hyposalivation. Factors associated with hyposalivation were: using fewer devices in oral hygiene, lacking social benefits for retirement/pension, living in a public retirement home, brushing teeth less than twice a day and lacking teeth without dentures. None of the factors included in this study were associated with xerostomia. We concluded that several variables studied were associated with hyposalivation, but none for xerostomia. Additional research should examine the amount of hyposalivation and factors associated with hyposalivation especially in elderly with increased risk for hyposalivation. PMID:28094800

  16. Relationship between knowledge and attitudes regarding HIV/AIDS among dental school employees and students.

    Science.gov (United States)

    Börsum, K M; Gjermo, P E

    2004-08-01

    Employees and students at the Faculty of Dentistry, University of Oslo responded to a comprehensive questionnaire regarding knowledge and attitudes towards human immunodeficiency virus (HIV). The intention of the present study was to describe possible relationships between the two. The questionnaire consisted of 39 closed questions. The response rate was 75% (436/584). The answers were used to construct additive indices for knowledge and attitudes. The knowledge index reflected the number of correct answers concerning risk groups and transmission. A factor analysis revealed three dimensions of attitudes ('legal', 'personal risk', and 'personal consequences'), which were analysed separately against knowledge. Correlation analyses (Spearman r) of all respondents together (n = 436) revealed a weak, but statistically significant, positive correlation between knowledge and the 'legal' and 'personal risk' dimension of attitudes (r = 0.16, P 0.05). The strongest correlation was found between knowledge and the 'legal' dimension (r = 0.43, P risk' dimension (r = 0.41, P patients with HIV/acquired immune deficiency syndrome were identified amongst the respondents. A weak correlation between knowledge and two of the attitudes might indicate that knowledge plays a role in this respect.

  17. [Biomechanical study on dento-alveolar arch forces].

    Science.gov (United States)

    Onu, Brînduşa; Burlui, V

    2009-01-01

    This study has two major objectives. The first one is to draw attention in an original device especially conceived and designed to measure bite force; the second purpose of the study is represented by proper measurements of individual bite force during bilateral clenching for two lots of patients using this device and comparing the outcomes to those of other similar studies, in order to prove its practical utility. 62 young (20-35 years of age) healthy patients were tested: 35 fully dentured subjects in control group and 27 subjects with various single unit treated edentation, in test group. The two potentiometers from the lateral side of the device are connected to a computer which would measure, register and interpret the outcomes during three different sessions of clenching for each patient. Measured values showed that the mean maximum bilateral bite force in patients with no edentation was, in all cases, higher than in patients with single unit treated edentation for all three sessions. Because the device allows simultaneous bilateral registration of the bite force, during the same session, it is obvious that it can measure also the asymmetry between left and right dental hemi-arches. Therefore, in control group, mean values found in left side were higher (369.36N - 399.75N) than right side (352.18N - 392.15N); an opposite situation was found in test group: higher values were found in right side (313.75N - 329.43N) comparing to left side (310.54N -321.53N). The device proved to be usefull not only for measuring bite force in one region of dental arches, but it is designed to simultaneous register parameters from various regions; the values obtained in this study are similar to those reported by others authors who used more sophisticated devices, so that this simple device proves its usefulness.

  18. Structure-Composition-Property Relationships in Polymeric Amorphous Calcium Phosphate-Based Dental Composites

    Directory of Open Access Journals (Sweden)

    Drago Skrtic

    2009-11-01

    Full Text Available Our studies of amorphous calcium phosphate (ACP-based materials over the last decade have yielded bioactive polymeric composites capable of protecting teeth from demineralization or even regenerating lost tooth mineral. The anti-cariogenic/remineralizing potential of these ACP composites originates from their propensity, when exposed to the oral environment, to release in a sustained manner sufficient levels of mineral-forming calcium and phosphate ions to promote formation of stable apatitic tooth mineral. However, the less than optimal ACP filler/resin matrix cohesion, excessive polymerization shrinkage and water sorption of these experimental materials can adversely affect their physicochemical and mechanical properties, and, ultimately, limit their lifespan. This study demonstrates the effects of chemical structure and composition of the methacrylate monomers used to form the matrix phase of composites on degree of vinyl conversion (DVC and water sorption of both copolymers and composites and the release of mineral ions from the composites. Modification of ACP surface via introducing cations and/or polymers ab initio during filler synthesis failed to yield mechanically improved composites. However, moderate improvement in composite’s mechanical stability without compromising its remineralization potential was achieved by silanization and/or milling of ACP filler. Using ethoxylated bisphenol A dimethacrylate or urethane dimethacrylate as base monomers and adding moderate amounts of hydrophilic 2-hydroxyethyl methacrylate or its isomer ethyl-α-hydroxymethacrylate appears to be a promising route to maximize the remineralizing ability of the filler while maintaining high DVC. Exploration of the structure/composition/property relationships of ACP fillers and polymer matrices is complex but essential for achieving a better understanding of the fundamental mechanisms that govern dissolution/re-precipitation of bioactive ACP fillers, and

  19. Orthodontic evolution: an update for the general dental practitioner. Part 2: psychosocial aspects of orthodontic treatment, stability of treatment, and the TMJ-orthodontic relationship.

    Science.gov (United States)

    McGuinness, Niall J P

    2008-01-01

    As a result of recent innovations and improvements, orthodontic treatment has become easier and more efficient to carry out, allowing greater numbers of patients to receive treatment. The main result of orthodontic treatment is improved dental alignment and aesthetics. Treatment has no effect on caries or periodontal disease, and the dental health gain is modest, apart from a very small percentage of destructive malocclusions. Psychological improvements using different psychological parameters show differing results and it is not clear that any psychological gains are long lasting. Social gain (greater willingness to smile, feeling good about oneself, satisfaction with dental appearance, etc.), and reported improved quality of life (QoL measures), are now becoming more important as consumer-related outcomes and may, ultimately, contribute to psychosocial and psychological status. Stability of orthodontic treatment results cannot be guaranteed and all patients need to be informed of this, and of the need for long-term retention. Malocclusion has little or no relationship to temporo-mandibular joint dysfunction and orthodontic treatment neither causes nor cures such problems. Extractions as part of orthodontic treatment do not cause TMD, nor do they cause collapse of the vertical dimension. The major improvements in dental health in the last 40 years have been accompanied by a great increase in demand for treatment. In any public health service that is free at the point of use, demand for treatment invariably exceeds the ability of resources to supply this. Indices of treatment need are widely used to determine treatment need and eligibility for treatment in public health systems. Demand for orthodontic treatment among adolescents can be as high as 60% in the general population, while the professionally-assessed need for treatment is approximately half this figure. Age, sex, socio-economic status, perceived unattractiveness of dental appearance, and availability of

  20. The Relationship Between Dental Trauma, Anxiety and Aggression Behavior in 7 to14 Year old Children in Kosovo

    Directory of Open Access Journals (Sweden)

    Fehim Haliti

    2017-01-01

    Full Text Available Background and aim. Dental fear has a negative impact on the treatment outcomes. The aim of this study was to evaluate dental anxiety among children with different measurement scales, with the aim of getting more precise and thorough estimations, as well as correlation between anxiety scale and aggression scale in children with/or without dental trauma. Material and methods. The study population include 254 children’s experience with dental trauma (59.1% male, and 251 children without dental trauma (46.6% male, between 7 and 14 years old, and their respective parents were evaluated during 2015-2016. Psychometric measures used for this purpose included several questionnaires. The result was tested with the X2 test, Student’s t-test, one-way ANOVA, and Pearson’s correlation coefficient. The Cronbach alpha was used to check the reliability and validity of the measures. The predetermined significance levels were set at 0.05. Results. All used test has satisfactory reliability and validity of the scale. The mean anxiety score was significantly higher in children with dental trauma. The children with dental trauma had a higher mean aggression scale (OAS. The girls had significantly higher mean anxiety score than boys in all used questionnaires. The mean aggression score was significantly higher for boys than girls in both compared groups (p<0.001. The Odds of the aggressive behavior in children with dental trauma decrease for 0.95 when the value of the mean DVSS-SV scale is increased by one units, and increase for 1.04 when the means anxiety score increased by one units. Conclusion. The mean anxiety score was significantly higher in children with dental trauma, as well as the girls and children who are more afraid of medical interventions (CMFQ. Also the children with dental trauma, and boys had a higher mean aggression scale (OAS. Significant correlation was found between dental anxiety level and aggressive behavior of children’s. The odds of

  1. Mycotic Aneurysm of the Aortic Arch

    Directory of Open Access Journals (Sweden)

    Ji Hye Seo

    2014-08-01

    Full Text Available A mycotic aneurysm of the thoracic aorta is rare. We report a case of mycotic aneurysm that developed in the aortic arch. An 86-year-old man was admitted with fever and general weakness. Blood culture yielded methicillin-resistant Staphylococcus aureus. Chest X-ray showed an enlarged aortic arch, and computed tomography scan revealed an aneurysm in the aortic arch. The patient was treated only with antibiotics and not surgically. The size of the aneurysm increased rapidly, resulting in bronchial obstruction and superimposed pneumonia. The patient died of respiratory failure.

  2. In-Plane Elastic Buckling of Arch

    Institute of Scientific and Technical Information of China (English)

    剧锦三; 郭彦林

    2002-01-01

    The in-plane elastic buckling behavior of arches is investigated using a new finite-element approach for the nonlinear analysis. The linear buckling, nonlinear primary buckling, and secondary bifurcation buckling behavior of arches are compared taking into account the large deformation and the effects of initial geometric imperfections or perturbations. The theoretical investigation emphasizes the nonlinear secondary bifurcation buckling behavior for a full span uniformly distributed load. The efficiency of compact method for tracing secondary buckling path is shown through several examples. Finally, a new structural design, which prevents the secondary bifurcation buckling by adding some crossed cables across the arch, is proposed to improve the limit load carrying capacity.

  3. Foot medial longitudinal-arch deformation during quiet standing and gait in subjects with medial tibial stress syndrome

    DEFF Research Database (Denmark)

    Bandholm, Thomas Quaade; Boysen, Lisbeth; Haugaard, Stine

    2008-01-01

    ). There was no correlation between medial longitudinal-arch deformation during quiet standing and gait in either of the 2 groups (r .653). The subjects with medial tibial stress syndrome in this study demonstrated increased navicular drop and medial longitudinal-arch deformation during quiet standing......The objective of this study was to investigate (1) if subjects with medial tibial stress syndrome demonstrate increased navicular drop and medial longitudinal-arch deformation during quiet standing and gait compared with healthy subjects, and (2) the relationship between medial longitudinal......-arch deformation during quiet standing and gait. Thirty subjects aged 20 to 32 years were included (15 with medial tibial stress syndrome and 15 controls). Navicular drop and medial longitudinal-arch deformation were measured during quiet standing with neutral and loaded foot using a ruler and digital photography...

  4. 口腔牙菌斑与呼吸机相关性肺炎的关系%Relationship of dental plaque and ventilator associated pneumonia

    Institute of Scientific and Technical Information of China (English)

    高伟良; 王凌伟; 吴伟元; 陶维华

    2015-01-01

    Objective To investigate the relationship of dental plaque and ventilator associated pneumonia (VAP)in patients undergoing mechanical ventilation.Methods A total of 30 patients with VAP who were admitted into the intensive care unit of hospital were selected.Dental plaques and bronchoalveolar lavage fluids (BALF)samples from patients were cultured,the bacteria from the BALF and dental plaques were identified and homology analysis was determined by pulsed-field gel electrophoresis.Results Aerobic bacteria were cultured from 22 dental plaques of 30 patients,including 1 5 patients with equal to or greater than 2 kinds of bacteria;aerobic bacteria were cultured from 1 7 BALF samples.The proportion of gram-negative bacteria was higher than that of gram-positive bacteria isolating from both the dental plaques and BALF samples.Bacteria from 10 BALF samples showed highly homologous with those of dental plaques samples.Conclusion Dental plaques are closely related to VAP and may serve as important reservoir for respiratory pathogens in patients undergoing mechanical ventilation.%目的:探讨机械通气患者口腔牙菌斑与呼吸机相关性肺炎(VAP)的关系。方法选择我院重症监护病房行机械通气后并发 VAP 的30例患者,同时取其口腔牙菌斑和肺泡灌洗液进行培养,并进行细菌鉴定和同源性分析。结果30例患者中有22例的牙菌斑能培养出需氧细菌,其中15例的牙菌斑培养出的需氧菌≥2种;17例患者的肺泡灌洗液能培养出需氧细菌。牙菌斑和肺泡灌洗液培养出的革兰阴性菌的比例均高于革兰阳性菌。17个肺泡灌洗液样本中有10个和自身牙菌斑所培养出来的细菌具有高度同源性。结论口腔牙菌斑与 VAP 的发生密切相关,可能是机械通气患者呼吸道病原体的一个重要来源。

  5. Relationship between Leucite Content and Compressive Strength of K2O-Al2O3-SiO2 System Dental Glass Ceramics

    Institute of Scientific and Technical Information of China (English)

    ZHANG Biao; QIAN Fatang; DUAN Xinglong; WU Bolin

    2009-01-01

    Relationship between leucite content and compressive strength of K2O-Al2O3-SiO2 sys-tem dental glass ceramics were investigated. 10 groups of feedstock powder with different composi-tions were treated according to the same thermal treatment system of leucite micro-crystallization reported in some primary studies. The products of each group were analyzed by X-ray diffractometer,polaring microscope and scanning electronic microscope (SEM), and then the compressive strength was tested by a material testing machine. A direct proportion was found between leucite content and the compressive strength when leucite content was less than 50 vol%, and compressive strength de-creased with the increasing of leucite micro-crystals when leucite content was more than 50vol%, The leucite content has a notable influence on the compressive strength of K2O-Al2O3-SiO2 system dental glass ceramics.

  6. Radiographic signs and diagnosis of dental disease.

    Science.gov (United States)

    Bellows, J

    1993-08-01

    Dental radiographs are critical for the complete assessment and treatment of dental diseases. Dental radiography is commonly used to evaluate congenital dental defects, periodontal disease, orthodontic manipulations, oral tumors, endodontic treatments, oral trauma, and any situation where an abnormality is suspected. Although standard radiographic equipment and film can be used to produce dental radiographs, dental X-ray equipment and film provide superior quality images and greater convenience of animal patient positioning. An understanding of normal dental radiographic anatomy is important when interpreting dental radiographs. Stage III periodontitis is the earliest stage of periodontal disease at which radiographic abnormalities become apparent. Bone loss associated with periodontal disease can be classified as either horizontal or vertical. Periapical radiolucencies can represent granulomas, cysts, or abscesses, whereas periapical radiodensities may represent sclerotic bone or condensing osteitis. Lytic lesions of the bone of the jaw often represent oral neoplasms. Neoplasms also can displace or disrupt teeth in the dental arch. Resorptive lesions can be external or internal and appear as radiolucent areas involving the external surface of the root or the pulp cavity, respectively. Feline dental resorptive lesions, also known as odontoclastic resorptions, are a specific form of dental resorptive lesions unique to cats.

  7. 幽门螺杆菌与口腔疾病相关性分析%The relationship between helicobacter pylori in dental plaque and oral disease

    Institute of Scientific and Technical Information of China (English)

    陈发明; 贾保军; 邓玲玲; 黄征难; 孙海花

    2000-01-01

    目的:研究幽门螺杆菌(Hp)感染与口腔疾病的关系。方法:通过PCR方法检测口腔疾病患者和正常人牙菌斑中Hp情况。结果:牙菌斑Hp与复发性口腔溃疡(ROU)高度相关(P<0.01);与口腔扁平苔癣(OLP)、牙周炎、干槽症(DS)、龋病呈显著性相关(P<0.05);牙周炎、龋病严重程度和牙菌斑取样部位与Hp检出阳性率亦有关联(P<0.05)。结论:牙菌斑Hp感染与口腔疾病发病明显相关。%AIM:Investigation of the relationship between hehcobacter pylori (Hp) in dental plaque and oral diseases. METHODS: A total of 3510 subgingival dental plaque samples were collected from oral disease patients and healthy individuals, Hp was detected by PCR methods. RESULTS:The prevalance of Hp infection in recurrent oral ulcer (ROU) was highly significant(P<0.01); in oral lichen planus (OLP), periodontitis,dry socket (DS), and caries, the significant relationship (P <0.05) existed. The distribution of Hp in dental plaque had relation with activities and regions (from caries and non- caries regions,or from periodontitis and non- periodontitis regions) ( P<0.05). CONCLUSION: results showed that Hp infection in dental plaque was closey related with oral diseases.

  8. [Studies on the changes of adaptation with children in the dental setting. The relationship between the changes of adaptation and various psychological tests].

    Science.gov (United States)

    Uchida, T; Mukai, Y; Sasa, R

    1991-01-01

    The purpose of this study was to discover the changes in the adaptation of children to the Dental setting, and to discover the relationship between the adaptation, and the personality of the child, the personality of the mother, as well as the relationship between the mother and child. The subjects were 60 two to six year old children and their mothers who visited at the Department of Pedodontics, School of Dentistry, Showa University. The results were as follows: 1) The changes of adaptation were classified in groups of four classes. Four groups: Continuous Adaptability (45.0%) Acquired Adaptability (18.3%) Continuous Inadaptability (16.7%) Extreme Inadaptability (20.0%) 2) The inadaptability groups (Continuous Inadaptability and Extreme Inadaptability) of the two to three year old children did not correlate to the change of adaptation and personality of the child, and the relationship between the mother and child. 3) The extreme inadaptability group with the four year old children showed a connection with the change of adaptation and the various Psychological Tests. Concerning personality, the children showed elements of "dependence" "retrogression" and "maladaptation to school (kindergarten)". Concerning the mother child relationship, there were elements of "anxiety" "dotage" "follow blindly" "disagreement". 4) Nobody showed extreme inadaptability in the group of five to six year old children. Continuous Inadaptability group with the five to six year old children showed scarcely any problems. 5) The Personality of mother did not correlate to the change of adaptation of children in the dental setting.

  9. CORRECTION OF ALVEOLAR ARCH MALALIGNMENT AFTER TOTAL CORRECTION IN UNILATERAL AND BILATERAL GR III CLEFTS

    Directory of Open Access Journals (Sweden)

    Mohana Rao

    2015-06-01

    Full Text Available AIMS AND OBJECTIVES: Aim of this study is to document and analyse the pre - operative and postoperative alveolar arch impressions . MATERIALS AND METHODS: 20 cases of both unilateral and bilateral GR III clefts selected for this study. These pati ents were operated at the age of not less than 9 months, preferably below the age of 18 months. Below the age of 9 months general condition of these children may not cope up the duration of general anesthesia and amount of surgical trauma. After intubating the patient preoperatively, with the help of custom made metal arch plates, at first, Medical grade Alginate material with optimal hydration used to get negative impression, from these , positive impressions were obtained by the use of optimally hydrated m edical grade stone powder routinely used by dental surgeons. These positive impressions along with negative impression s and metal plates allowed to settle down for 10 hours undisturbed, after that positive impressions retrieved carefully without breaking a nd stored for analysis. Similarly postoperative impressions were taken after a gap of 2 years in the same manner like that of pre - operative ones under general anesthesia. Both impressions w ere compared and analysis was done regarding alveolar arch malalign ment, asymmetry and arch collapse correction. RESULTS & CONCLUSION: The status of the alveolar arch after single stage operation for cleft lip and palate in the unilateral cleft was much improved and there was considerable correction of the arch collapse a s well; in the bilateral cleft the correction of the premaxillary protrusion was better appreciated than the degree of correction of the alveolar gap.

  10. Distúrbios craniomandibulares em pacientes edentados unilaterais inferiores com e sem próteses parciais removíveis (PPR: um estudo transversal utilizando o índice craniomandibular Craniomandibular disorders in unilateral lower free end dental arch subjects with and without removable partial dentures (RPD: a cross sectional study using the craniomandibular index (CMI

    Directory of Open Access Journals (Sweden)

    Carlos GIL

    1998-04-01

    following a score methodology according to clinical history, examination and study models. The following groups were observed: a 34 patients wearing removable partial dentures (RPD with unilateral absence of teeth (Kennedy’s Class II; b 34 patients not wearing removable partial dentures with unilateral absence of teeth, and c 34 patients with complete dental arches. All subjects in this survey presented some degree of pain or muscle discomfort. The results showed statistically significant differences between the three groups: the non RPD, partially edentulous subjects, with absence of teeth for more than 5 years had the worst degree of severity of signs and symptoms of CMD. It was concluded that the main signs and symptoms can be reliably evaluated utilizing this (CMI score methodology.

  11. Complete interruption of the aortic arch

    Energy Technology Data Exchange (ETDEWEB)

    Park, Sung Hak; Park, In Kyu; Lee, Won Hwa; Kim, Yong Joo; Kang, Duk Sik; Lee, Jong Tae [Kyungpook National University College of Medicine, Taegu (Korea, Republic of)

    1984-09-15

    Complete interrupture of the aortic arch is one of the least common cardiac malformation. In this condition, continuity between the ascending and descending protions of the aorta is not present, and the descending aorta is supplied through a reversing patent ductus arteriosus. In the majority of the patients a ventricular septal defect is present. Authors have experienced a case of the complete interruption of aortic arch, interruption between the left carotid and the left subclavian artery.

  12. Fractionally Integrated Models With ARCH Errors

    OpenAIRE

    Hauser, Michael A.; Kunst, Robert M.

    1993-01-01

    Abstract: We introduce ARFIMA-ARCH models which simultaneously incorporate fractional differencing and conditional heteroskedasticity. We develop the likelihood function and a numerical estimation procedure for this model class. Two ARCH models - Engle- and Weiss-type - are explicitly treated and stationarity conditions are derived. Finite-sample properties of the estimation procedure are explored by Monte Carlo simulation. An application to the Standard & Poor 500 Index indicates existence o...

  13. Highly Tunable Electrothermally Actuated Arch Resonator

    KAUST Repository

    Hajjaj, Amal Z.

    2016-12-05

    This paper demonstrates experimentally, theoretically, and numerically a wide-range tunability of electrothermally actuated MEMS arch beams. The beams are made of silicon and are intentionally fabricated with some curvature as in-plane shallow arches. Analytical results based on the Galerkin discretization of the Euler Bernoulli beam theory are generated and compared to the experimental data and results of a multi-physics finite-element model. A good agreement is found among all the results. The electrothermal voltage is applied between the anchors of the clamped-clamped MEMS arch beam, generating a current that passes through the MEMS arch beam and controls its axial stress caused by thermal expansion. When the electrothermal voltage increases, the compressive stress increases inside the arch beam. This leads to increase in its curvature, thereby increases the resonance frequencies of the structure. We show here that the first resonance frequency can increase up to twice its initial value. We show also that after some electro-thermal voltage load, the third resonance frequency starts to become more sensitive to the axial thermal stress, while the first resonance frequency becomes less sensitive. These results can be used as guidelines to utilize arches as wide-range tunable resonators.

  14. The growth of foot arches and influencing factors

    OpenAIRE

    Ferial Hadipoetro Idris

    2016-01-01

    Background Foot arches are important components for body sup- port. Foot arch deformity caused by growth abnormalities cause serious limitations in daily activities. Objectives To determine the patterns of foot arch growth, factors influencing foot arch growth, and the timing for intervention in er- rant growth patterns. Methods A cross-sectional study evaluated the foot arches of chil- dren aged 0-18 years according to age and sex. Subjects included had no evidence of...

  15. The relationship of PTH Bst BI polymorphism, calciotropic hormone levels, and dental fluorosis of children in China.

    Science.gov (United States)

    Wen, Shibao; Li, Anqi; Cui, Liuxin; Huang, Qi; Chen, Hongyang; Guo, Xiaoyi; Luo, Yixin; Hao, Qianyun; Hou, Jiaxiang; Ba, Yue

    2012-06-01

    The aim of this study was to explore the association of parathyroid hormone (PTH) gene Bst BI polymorphism, calciotropic hormone levels, and dental fluorosis of children. A case-control study was conducted in two counties (Kaifeng and Tongxu) in Henan Province, China in 2005-2006. Two hundred and twenty-five children were recruited and divided into three groups including dental fluorosis group (DFG), non-dental fluorosis group (NDFG) from high fluoride areas, and control group (CG). Urine fluoride content was determined using fluoride ion selective electrode; PTH Bst BI were genotyped using PCR-RFLP; osteocalcin (OC) and calcitonin (CT) levels in serum were detected using radioimmunoassay. Genotype distributions were BB 85.3% (58/68), Bb 14.7% (10/68) for DFG; BB 77.6% (52/67), Bb 22.4% (15/67) for NDFG; and BB 73.3% (66/90), Bb 27.7% (24/90) for CG. No significant difference of Bst BI genotypes was observed among three groups (P > 0.05). Serum OC and urine fluoride of children were both significantly higher in DFG and NDFG than in CG (P 0.05). Serum OC level of children with BB genotype was significantly higher compared to those with Bb genotype in high fluoride areas (P dental fluorosis and PTH Bst BI polymorphism. Serum OC might be a more sensitive biomarker for detecting early stages of dental fluorosis, and further studies are needed.

  16. 正畸弓丝形态的研究进展%Research prowess on the arch form in orthodontics

    Institute of Scientific and Technical Information of China (English)

    张林; 段沛沛

    2012-01-01

    在正畸临床治疗过程中,弓丝形态的设计和应用至关重要,其不仅关系到正畸治疗效果,而且对治疗周期、治疗后的稳定性等有着重要影响.不正确的弓丝形态的应用容易造成牙弓、牙槽弓、基骨弓形态的不一致,从而可能引起口颌肌系统功能不协调,容易导致复发.很多学者对怎样确定正确的正畸弓丝形态进行了大量研究,包括寻找适合大多数患者的理想弓形以及适合于个别患者的个体(牙合)弓形.本文将对标准理想牙弓形态以及个体(牙合)牙弓形态的拟合理论、应用现状以及优缺点作一综述.%The size and shape of the arch wire used in orthodontic treatment have considerable implications on the treatment effect, treatment cycle and the stability of the dentition. Using improper arch wire may cause mismatching of shape among dental arch, alveolar arch and basal arch, affecting the equilibrium of teeth between tongue and circumoral muscle forces. This always leads to relapse. Arch form relative to orthodontic therapy has been examined in various studies, including the classic and individual arch wire form. The aim of the article is to give a review on the relevant researches about the combination of the classic and individual arch wire form. The theory, practical applications and problems of these methods are described.

  17. Dental Emergencies

    OpenAIRE

    Domb, Ivor

    1982-01-01

    Emergency dental problems can result from trauma, dental pathology, or from dental treatment itself. While the physician can treat many instances of dental trauma, the patient should see a dentist as soon as possible so that teeth can be saved. Emergency treatment of dental pathology usually involves relief of pain and/or swelling. Bleeding is the most frequent post-treatment emergency. The physician should be able to make the patient comfortable until definitive dental treatment can be avail...

  18. The relationships between low levels of urine fluoride on children's intelligence, dental fluorosis in endemic fluorosis areas in Hulunbuir, Inner Mongolia, China.

    Science.gov (United States)

    Ding, Yunpeng; YanhuiGao; Sun, Huixin; Han, Hepeng; Wang, Wei; Ji, Xiaohong; Liu, Xuehui; Sun, Dianjun

    2011-02-28

    There has been public concern about children's intellectual performance at high levels of fluoride exposure, but few studies provide data directly to the question of whether low fluoride exposure levels less than 3.0 mg/L in drinking water adversely associated with children's intelligence. In this survey, we investigated the effects of low fluoride exposure on children's intelligence and dental fluorosis. 331 children aged from 7 to 14 were randomly recruited from four sites in Hulunbuir City, China. Intelligence was assessed using Combined Raven Test-The Rural in China while dental fluorosis was diagnosed with Dean's index. Mean value of fluoride in drinking water was 1.31±1.05 mg/L (range 0.24-2.84). Urine fluoride was inversely associated with IQ in the multiple linear regression model when children's age as a covariate variable was taken into account (Pdental fluorosis (Pdental health and confirmed the dose-response relationships between urine fluoride and IQ scores as well as dental fluorosis. Copyright © 2010 Elsevier B.V. All rights reserved.

  19. Immediate loading of immediate mandibular implants with a full-arch fixed prosthesis: a preliminary study.

    Science.gov (United States)

    Peñarrocha, Miguel; Boronat, Araceli; Garcia, Berta

    2009-06-01

    To determine the survival of immediate dental implants with immediate loading in the partially edentulous mandible, by use of a full-arch screw-retained provisional restoration. Patients who were partially edentulous in the mandible with indications for extraction of the remaining teeth and with a minimum follow-up of 12 months after implant placement were included in the study. They were treated in chronologic order by the insertion of 6 Defcon dental implants (Impladent, Sentmenat, Spain) subjected to immediate loading (4 interforaminal and 2 posterior placements). Implants with a minimum primary stability of 60 implant stability quotient were loaded. All resin screw-retained prostheses were inserted and loaded with fully functional occlusion within 24 hours of implant placement. Eleven patients were treated with immediate implants, although 2 patients were excluded from the study for having an implant stability quotient value below 60 in at least one of the implants after surgery and did not undergo restoration with immediate loading. Fifty-four implants were placed in 9 partially edentulous patients with immediate loading with a full-arch screw-fixed prosthesis. The patients wore this provisional prosthesis during the healing period (2 months) without complication and with a high level of comfort. The survival rate of the implants was 100% at 12 months of follow-up. Immediate mandibular loading with immediate full-arch implant-supported and screw-retained restorations is a viable treatment alternative, yielding a 100% success rate in this small series of patients.

  20. The relationship between access to and use of dental services following expansion of a primary care service to embrace dental team training.

    Science.gov (United States)

    Wanyonyi, K L; Radford, D R; Gallagher, J E

    2013-11-01

    To investigate changes in the patient population and treatment case-mix within an expanded primary care dental training facility in Southern England. Cross-sectional analysis of patient management system data. Electronic data for patients with a closed/completed treatment plan in the 12-month period prior to, and following, dental service expansion were extracted for analysis (n = 4343). Descriptive analysis involved age, sex, payment status, deprivation status and treatment activity. Logistic regression was used to model the likelihood of treatment involving laboratory constructed devices (crowns, bridges, dentures), in relation to demography and deprivation in each time period. The volume of patients using the service increased by 48.3% (1749 cf 2594). The average age increased from 31.97 (95%CI: 30.8, 32.5) to 36.4 years (95%CI: 35.6, 37.1); greatest increase was in the over 75 years age-group (96%). The patient base became less deprived: patients exempt from payment reduced from 43.2% (n = 755) to 28.6% (n = 741) (P = 0.001) and the mean population deprivation score (IMD) reduced from 24.5 (95%CI: 23.8, 25.2) to 22.3 (95%CI: 21.7, 22.8). The volume and proportion of care involving laboratory constructed devices increased from 8.3% (n = 145) to 15.8% (n = 411) whilst assessments without interventive care decreased (34.5%-26.3%). On a logistic regression, the odds of having treatment involving laboratory constructed devices, increased with increasing age in both time periods 7% (95% CI: 1.06-1.08) and 6% (95% CI: 1.05-1.07) respectively. Furthermore, the odds increased by 38% OR: 1.38 (95% CI: 1.01-1.89) in period 2, for white patients. After adjusting for these effects, the odds of having care that involved laboratory constructed devices were less in period 2 than period 1 (100% cf 43%) for those who were technically exempt from payment (OR = 2.0; 95% CI 1.34 to 2.90 cf, OR = 1.43; 95% CI 1.13-1.81). The patient population altered in relation to age and socio

  1. Influence of the banded Herbst appliance on dental changes in mixed dentition

    Directory of Open Access Journals (Sweden)

    Luana Paz Sampaio

    2012-02-01

    Full Text Available OBJECTIVE: This prospective clinical study was conducted with the purpose of evaluating the influence of the banded Herbst appliance on dental changes during the early treatment of Class II malocclusion. METHOD: The sample consisted of 15 prepubertal subjects (12 boys and 3 girls, initial age: 9 years and 6 months who were treated with the Herbst appliance. Treatment effects were compared with those of a Class II Division 1 group of 15 subjects (8 boys and 7 girls, mean initial age 9 years and 1 month, not treated orthodontically. Statistical analysis was performed using Student t-test with 5% significance level. RESULTS: The results showed that treatment with the banded Herbst appliance in the mixed dentition stage tended to upright maxillary incisors (mean: 4.14°. The maxillary molars were distalized and intruded significantly (mean 2.65 mm and 1.24 mm, respectively, the lower incisors slightly protruded anteriorly (mean 1.64 mm and the molars showed no significant changes in the horizontal and vertical directions. Furthermore, significant improvements were noted in overbite (1.26 mm, overjet (4.8 mm and molar relationship (12.08 mm. CONCLUSIONS: Changes in the upper dental arch were found to be greater than changes in the lower arch. Furthermore, mandibular anchorage loss was reduced due to the anchorage system used in the study.

  2. Dental Procedures.

    Science.gov (United States)

    Ramponi, Denise R

    2016-01-01

    Dental problems are a common complaint in emergency departments in the United States. There are a wide variety of dental issues addressed in emergency department visits such as dental caries, loose teeth, dental trauma, gingival infections, and dry socket syndrome. Review of the most common dental blocks and dental procedures will allow the practitioner the opportunity to make the patient more comfortable and reduce the amount of analgesia the patient will need upon discharge. Familiarity with the dental equipment, tooth, and mouth anatomy will help prepare the practitioner for to perform these dental procedures.

  3. Relationship Between Dental Fluorosis and Intelligence Quotient of School Going Children In and Around Lucknow District: A Cross-Sectional Study.

    Science.gov (United States)

    Khan, Suleman Abbas; Singh, Rahul Kumar; Navit, Saumya; Chadha, Dheera; Johri, Nikita; Navit, Pragati; Sharma, Anshul; Bahuguna, Rachana

    2015-11-01

    Fluoridation of drinking water, despite being regarded as one of the top ten public health achievements of the twentieth century, has remained a much debated concept. Various studies on animals and aborted human fetuses have confirmed that excessive fluoride intake during infancy and early childhood, causes a number of irreversible structural and functional changes in the CNS leading to memory, learning and intellectual deficits. To compare the IQ levels of school children of two different locations, having different fluoride levels in water, and to establish a relationship between fluoride levels, prevalence of fluorosis and its effect on IQ levels. A cross-sectional study was conducted among 429 children aged 6 - 12 years, selected by stratified random sampling from two different areas with different levels of fluoride in drinking water in and around Lucknow district. Dental fluorosis was measured using Dean's Fluorosis Index. Intelligence Quotient was measured using Raven's Coloured Progressive Matrices (1998 edition). Majority of the fluorosis free children (76.3%) had an IQ grade 2 (definitely above the average). Majority of the children suffering from very mild and mild dental fluorosis were found to have IQ grade 3 (Intellectually average). Children with moderate cases of dental fluorosis were found to have IQ grade 4 (Definitely below average). Only 5 children with severe fluorosis were included in the study and they all were found to have an IQ grade 5. Hence, a trend of increase in the IQ grade (decrease in intellectual capacity) was observed indicating a strong correlation between fluorosis grade and IQ grade. Findings of this study suggest that the overall IQ of the children exposed to high fluoride levels in drinking water and hence suffering from dental fluorosis were significantly lower than those of the low fluoride area.

  4. The relationship between body mass index, the use of second-generation antipsychotics, and dental caries among hospitalized patients with schizophrenia.

    Science.gov (United States)

    Chu, Kuan-Yu; Yang, Nan-Ping; Chou, Pesus; Chi, Lin-Yang; Chiu, Hsien-Jane

    2011-01-01

    Weight gain is common in schizophrenia due to use of the second-generation antipsychotic medicines (SGAs). Studies have also shown that body mass index (BMI) and the side effect of SGAs, such as anticholinergic activity, are related to the risk of dental caries. This study aims to investigate the relationship between BMI, the use of the SGAs, and the decayed, missing, and filled tooth index (DMFT) among hospitalized patients with schizophrenia. A cross-sectional survey of oral health was conducted in a psychiatric long-term care hospital in Taiwan in 2006. A total of 878 schizophrenic inpatients participated in this survey. The DMFT index was used to assess dental caries, the use of SGAs of subjects were recorded, and the BMI classification was done in accordance with Asian standard scales. Multiple regression models were used to measure the effects of SGAs or BMI on the DMFT index in each subject. Among the subjects with schizophrenia, DMFT is significantly related to independent variables such as age, length of stay, BMI, education, marital status, and grade of disability. Consequent multiple linear regression showed that being underweight (beta = 0.07, p = 0.041) and age were the most significant factors that influence the DMFT score. We found that the use of SGAs was not significantly associated with the DMFT index. After adjusting for age, being underweight is a significant factor associated with the increased risk of dental caries in hospitalized patients with schizophrenia. Psychologists and dentists should pay more attention to the relation between BMI and dental caries in this population.

  5. Right circumflex retro-oesophageal aortic arch with coarctation of a high-positioned right arch

    Energy Technology Data Exchange (ETDEWEB)

    Ahn, Kyung-Sik; Yong, Hwan Seok; Woo, Ok Hee; Kang, Eun-Young [Korea University Guro Hospital, Department of Radiology, Seoul (Korea); Lee, Joo-Won [Korea University Guro Hospital, Department of Paediatrics, Seoul (Korea)

    2007-06-15

    We present a rare case of right circumflex retro-oesophageal aortic arch with coarctation of a high-positioned right arch. A 7-month-old boy presented with a cardiac murmur. Cardiac situs was normal and there was no evidence of an intracardiac shunt or patent ductus arteriosus. MR aortography revealed a right aortic arch that was high-positioned, tortuous and narrowed. This right aortic arch crossed the midline behind the oesophagus and continued as a left-sided descending aorta. The left common carotid and subclavian arteries arose from a large branching vascular structure that derived from the top of the left-sided descending aorta. The right common carotid artery arose from the ascending aorta. The proximal portion of the right common carotid artery showed very severe stenosis and poststenotic dilatation. The right subclavian artery originated distal to the narrowed and tortuous segment of the aortic arch. (orig.)

  6. Integration of digital dental casts in cone-beam computed tomography scans

    NARCIS (Netherlands)

    Rangel, F.A.; Maal, T.J.J.; Berge, S.J.; Kuijpers-Jagtman, A.M.

    2012-01-01

    Cone-beam computed tomography (CBCT) is widely used in maxillofacial surgery. The CBCT image of the dental arches, however, is of insufficient quality to use in digital planning of orthognathic surgery. Several authors have described methods to integrate digital dental casts into CBCT scans, but all

  7. Tubular Steel Arch Stabilized by Textile Membranes

    Directory of Open Access Journals (Sweden)

    Ondrej Svoboda

    2016-10-01

    Full Text Available Tubular steel arch supporting textile membrane roofing is investigated experimentally and numerically. The stabilization effects of the textile membrane on in-plane and out-of-plane behavior of the arch is of primary interest. First a model of a large membrane structure tested in laboratory is described. Prestressed membranes of PVC coated polyester fabric Ferrari® Précontraint 702S were used as a currently standard and excellent material. The test arrangement, loading and resulting load/deflection values are presented. The supporting structure consisted of two steel arch tubes, outer at edge of the membrane and inner supporting interior of the membrane roofing. The stability and strength behavior of the inner tube under both symmetrical and asymmetrical loading was monitored and is shown in some details. Second the SOFiSTiK software was employed to analyze the structural behavior in 3D, using geometrically nonlinear analysis with imperfections (GNIA. The numerical analysis, FE mesh sensitivity, the membrane prestressing and common boundary conditions are validated by test results. Finally a parametrical study concerning stability of mid arch with various geometries in a membrane structure with several supporting arches is presented, with recommendations for a practical design.

  8. Thirty-two-year follow-up study of Herbst therapy: a biometric dental cast analysis.

    Science.gov (United States)

    Pancherz, Hans; Bjerklin, Krister; Lindskog-Stokland, Birgitta; Hansen, Ken

    2014-01-01

    The aim of this study was to analyze the very long-term effects of Herbst treatment on tooth position and occlusion. Fourteen patients from a sample of 22 with Class II Division 1 malocclusions consecutively treated with the banded Herbst appliance were reexamined 32 years after therapy. Dental casts were analyzed from before (T1) and after (T2) treatment, and at 6 years (T3) and 32 years (T4) after treatment. Minor changes in maxillary and mandibular dental arch perimeters and arch widths were seen during treatment (T1-T2) and posttreatment (T2-T4). Mandibular incisor irregularity remained, on average, unchanged from T1 to T2 but increased continuously during the 32-year follow-up period (T2-T4). Class II molar and canine relationships were normalized in most patients from T1 to T2. During the early posttreatment period (T2-T3), there was a minor relapse; during the late posttreatment period (T3-T4), molar and canine relationships remained, on average, unchanged. Overjet and overbite were reduced to normal values in all subjects during treatment (T1-T2). After treatment (T2-T4), overjet remained, on average, unchanged, but overbite increased insignificantly. Thirty-two years after Herbst therapy, overall, acceptable long-term results were seen. Stability was found in 64% of the patients for sagittal molar relationships, in 14% for sagittal canine relationships, in 86% for overjet, and in 86% for overbite. A Class II relapse seemed to be caused by an unstable interdigitation of the occluding teeth, a persisting oral habit, or an insufficient retention regimen after treatment. Most posttreatment changes occurred during the first 6 years after treatment. After the age of 20 years, only minor changes were noted. Long-term posttreatment changes in maxillary and mandibular dental arch perimeters and widths as well as in mandibular incisor irregularity seemed to be independent of treatment and a result of physiologic dentoskeletal changes throughout adulthood. Copyright

  9. The value of the Gothic arch tracing in the positioning of denture teeth.

    Science.gov (United States)

    el-Gheriani, A S; Winstanley, R B

    1988-07-01

    Twenty-five subjects of three nationalities carried out Gothic arch tracings. Measurements between the side arms were compared with the upper intercuspid distances measured in the same subjects. A relationship was found which may be of value in the setting up of anterior maxillary denture teeth.

  10. The relationship between the bacterium Streptococcus mutans in the saliva and dental caries in children in Mozambique.

    Science.gov (United States)

    Carlsson, P; Olsson, B; Bratthall, D

    1985-01-01

    Four hundred and sixty-two children, aged 10-14 years, from eight areas were examined for Streptococcus mutans in saliva and for dental caries. Strep. mutans strains from some samples were further characterized by serological and biochemical methods. Strep. mutans was identified in 98 per cent of the children and 40 per cent showed high counts. Serotypes c and d dominated among the strains. The distribution of Strep. mutans among the children varied between the eight areas but was not correlated with the difference in caries prevalence which ranged from 38 to 88 per cent. In individual children, however, there was an association between high counts of Strep. mutans and the presence of dental caries. Thus, Strep. mutans can be widely distributed and occurs in high numbers in a population with a low prevalence of caries.

  11. A unique variation of superficial palmar arch

    Directory of Open Access Journals (Sweden)

    Jiji PJ

    2009-09-01

    Full Text Available We present a unique variation in the arterial pattern of superficial palmar arch in which it was completed by one of the large terminal branches of radial artery. The origin of the arteria radialis indicis was also peculiar that it was arising from the communicating branch of the radial artery and further reinforced by the first dorsal metacarpal artery that joined it after reaching the volar aspect. Pertinent anatomical knowledge regarding the variations of the palmar arch is significant for the purposes of microvascular repairs and re-implantations.

  12. The acquisition of Streptococcus mutans by infant monkeys (Macaca fascicularis) and its relationship to the initiation of dental caries.

    Science.gov (United States)

    Beighton, D; Hayday, H; Walker, J

    1982-08-01

    The acquisition and transmission of Streptococcus mutans by 16 consecutively born infant monkeys (Macaca fascicularis) was studied. The 16 infant monkeys were weaned in four groups and caged together to form a commune. Transmission from mother to infant occurred infrequently. Streptococcus mutans was isolated from nine of the mothers but only from the dental plaque of two infant monkeys at weaning at which time the predominant streptococci were S. sanguis and S. mitior. One further animal was colonized by S. mutants during the formation of the commune, but only after it was caged with an infant harbouring the same organism. For 46 d after the completion of the commune, the monkeys were fed a starch-based diet during which time S. mutans of serotypes c, e or h were isolated from the faeces of all 16 animals and from the dental plaque taken from the developmental groove of the first deciduous molar of 11 animals. Faecal transmission appeared to be an important factor in the spread of S. mutans between monkeys in the commune. The monkeys were then fed a caries-promoting high sucrose diet resulting in a rapid increase in the proportion of S. mutans in the plaque and in the faeces. Streptococcus mutans serotype e was more frequently isolated from both plaque and faeces and its predominance may in part be due to the production of a bacteriocin active in vitro against S. mutans serotype h and other species of oral streptococci isolated from monkey dental plaque. The proportion of S. mutans in the developmental groove 8 d after the introduction of the high sucrose diet was significantly related to both the caries status of the groove and the total caries score 6 months later. The results suggest that, in this model of human dental caries, S. mutans is the major bacterial factor in the initiation of tooth decay.

  13. PROFILE ANALYSIS OF STANDARD TEETH WEAR IN PEOPLE SUFFERING FROM BRUXISM AND ITS RELATIONSHIP WITH DENTAL EROSION: A LONGITUDINAL ANALYSIS

    OpenAIRE

    Bonato, Letícia Ladeira; Universidade Federal Fluminense; Bastos, Flávia de Souza; Universidade Federal de Juiz de Fora; Meireles, Agnes Batista; Universidade Federal de Minas Gerais; de Ávila, Renato Françoso; Instituto Federal de Educação, Ciência e Tecnologia (Campus Juiz de Fora); GUIMARÃES,Josemar Parreira

    2015-01-01

    Although teeth wear is a physiological process, bruxism or teeth grinding is indicated as the sole etiological factor involved, without taking into consideration other wear processes, such as erosion and abrasion. Current descriptive and longitudinal analysis evaluates the surface roughness in teeth as dental wear standard in females diagnosed with acid erosion or attrition. Sample comprised 20 females, aged between 20 and 50 years old, divided into Group A (n=9) characterized by teeth grindi...

  14. Evaluation of the relationship between milk consumption and dental caries in 3-5 years old children in Ray city

    Directory of Open Access Journals (Sweden)

    J. Mahmodian

    1994-07-01

    Full Text Available Undoubtedly, Tooth decay is still one of the most significant problems in human communities. Tooth decay is defined as a microbial disease that causes demineralization of hard tissues and degradation of organic components of teeth. Although there are various theories on etiology of dental caries, Miller’s acidogenic theory (1890 and Gottileb’s proteolitic theory (1933 have gained the most credibility among the others. In general, status and amount of saliva, oral hygiene, tooth structure, type and quantity of microorganisms and diet are the most important factors that can lead to tooth decay. Since the manner and type of child nutrition during infancy is considered as a significant factor in development and progression of dental caries and also there has not been published any research on this subject in Iran yet, this study was designed and carried out to find the association between the type of milk intake in infancy and the rate of dental caries in 3-5 year old children.

  15. Educational material of dental anatomy applied to study the morphology of permanent teeth.

    Science.gov (United States)

    Siéssere, Selma; Vitti, Mathias; de Sousa, Luiz Gustavo; Semprini, Marisa; Regalo, Simone Cecílio Hallak

    2004-01-01

    The purpose of this report is to present educational material that would allow the dental student to learn to easily identify the morphologic characteristics of permanent teeth, and how they fit together (occlusion). In order to do this, macro models of permanent teeth with no attrition were carved in wax and later molded with alginate. These molds were filled with plaster, dental stone and/or cold-cured acrylic resin. The large individual dental stone tooth models were mounted on a wax base, thus obtaining maxillary and mandibular arches which were occluded. These dental arches were molded with plaster or dental stone. The authors suggest that these types of macro models allow an excellent visualization of the morphologic characteristics of permanent teeth and occlusion. Dental students are able to carve the permanent dentition in wax with great facility when they can observe macro models.

  16. Children with flat feet have weaker toe grip strength than those having a normal arch

    Science.gov (United States)

    Tashiro, Yuto; Fukumoto, Takahiko; Uritani, Daisuke; Matsumoto, Daisuke; Nishiguchi, Shu; Fukutani, Naoto; Adachi, Daiki; Hotta, Takayuki; Morino, Saori; Shirooka, Hidehiko; Nozaki, Yuma; Hirata, Hinako; Yamaguchi, Moe; Aoyama, Tomoki

    2015-01-01

    [Purpose] This study investigated the relationship between toe grip strength and foot posture in children. [Subjects and Methods] A total of 619 children participated in this study. The foot posture of the participants was measured using a foot printer and toe grip strength was measured using a toe grip dynamometer. Children were classified into 3 groups; flatfoot, normal, and high arch, according to Staheli’s arch index. The differences in demographic data and toe grip strength among each foot posture group were analyzed by analysis of variance. Additionally, toe grip strength differences were analyzed by analysis of covariance, adjusted to body mass index, age, and gender. [Results] The number of participants classified as flatfoot, normal, and high arch were 110 (17.8%), 468 (75.6%), and 41 (6.6%), respectively. The toe grip strength of flatfoot children was significantly lower than in normal children, as shown by both analysis of variance and analysis of covariance. [Conclusion] A significant difference was detected in toe grip strength between the low arch and normal foot groups. Therefore, it is suggested that training to increase toe grip strength during childhood may prevent the formation of flat feet or help in the development of arch. PMID:26696732

  17. A protocol for classifying normal- and flat-arched foot posture for research studies using clinical and radiographic measurements

    Directory of Open Access Journals (Sweden)

    Menz Hylton B

    2009-07-01

    Full Text Available Abstract Background There are several clinical and radiological methods available to classify foot posture in research, however there is no clear strategy for selecting the most appropriate measurements. Therefore, the aim of this study was to develop a foot screening protocol to distinguish between participants with normal- and flat-arched feet who would then subsequently be recruited into a series of laboratory-based gait studies. Methods The foot posture of ninety-one asymptomatic young adults was assessed using two clinical measurements (normalised navicular height and arch index and four radiological measurements taken from antero-posterior and lateral x-rays (talus-second metatarsal angle, talo-navicular coverage angle, calcaneal inclination angle and calcaneal-first metatarsal angle. Normative foot posture values were taken from the literature and used to recruit participants with normal-arched feet. Data from these participants were subsequently used to define the boundary between normal- and flat-arched feet. This information was then used to recruit participants with flat-arched feet. The relationship between the clinical and radiographic measures of foot posture was also explored. Results Thirty-two participants were recruited to the normal-arched study, 31 qualified for the flat-arched study and 28 participants were classified as having neither normal- or flat-arched feet and were not suitable for either study. The values obtained from the two clinical and four radiological measurements established two clearly defined foot posture groups. Correlations among clinical and radiological measures were significant (p r = 0.24 to 0.70. Interestingly, the clinical measures were more strongly associated with the radiographic angles obtained from the lateral view. Conclusion This foot screening protocol provides a coherent strategy for researchers planning to recruit participants with normal- and flat-arched feet. However, further research is

  18. Contribution of the transverse arch to foot stiffness in humans

    OpenAIRE

    Yawar, Ali; Korpas, Lucia; Lugo-Bolanos, Maria; Mandre, Shreyas; Venkadesan, Madhusudhan

    2017-01-01

    Stiffness of the human foot is central to its mechanical function, such as elastic energy storage and propulsion. Its doubly-arched structure, manifested as longitudinal and transverse arches, is thought to underlie the stiff nature. However, previous studies have focused solely on the longitudinal arch, and little is known about whether and how the transverse arch impacts the foot's stiffness. The common observation that a flexible currency bill significantly stiffens upon curling it transve...

  19. Precast Pearl-Chain concrete arch bridges

    DEFF Research Database (Denmark)

    Halding, Philip Skov; Hertz, Kristian Dahl; Schmidt, Jacob Wittrup

    2015-01-01

    A Pearl-Chain Bridge is a closed-spandrel arch bridge consisting of a number of straight pre-fabricated so called Super-Light Deck elements put together in an arch shape by post-tensioning cables. Several Pearl-Chain arches can be positioned adjacent to each other by a crane to achieve a bridge...... the technology was used. We also study other important components and details in the Pearl-Chain Bridge concept and review the effects of different types of loads. A theoretical case study of a circular 30 m span Pearl-Chain Bridge is presented showing the influence of a number of parameters: The number of post-tensioning......, and gives a large positive bending moment below the load and a smaller negative bending moment in the unloaded side. When the Pearl-Chain Bridge concept is compared to other pre-fabricated arch bridge solutions we find a number of advantages when using Pearl-Chain Bridges: Straight elements, combination...

  20. Assembly and lifting of Pearl-Chain arches

    DEFF Research Database (Denmark)

    Halding, Philip Skov; Hertz, Kristian Dahl; Viebæk, N.E.

    2015-01-01

    Pearl-Chain arches were invented at the Technical University of Denmark in cooporation with the company Abeo A/S. The system uses specially designed, pre-fabricated concrete elements that are post-tensioned together into an arch shape, which is then lifted into place. The arches can be used both...

  1. Dilatation of the aneurysmal sac after total arch replacement.

    Science.gov (United States)

    Watanuki, Hirotaka; Ogino, Hitoshi; Matsuda, Hitoshi; Minatoya, Kenji; Sasaki, Hiroaki; Fukuda, Tetsuya; Kitamura, Soichiro

    2008-02-01

    In our institution, total arch replacement for distal arch aneurysms is performed through a median sternotomy with antegrade selective cerebral perfusion. The distal anastomosis to the completely transected descending aorta is made through the aneurysmal sac. We report on three interesting cases presenting late dilatation of the aneurysmal sac due to collateral flow after total arch replacement.

  2. Relationship between friction force and orthodontic force at the leveling stage using a coated wire.

    Science.gov (United States)

    Murayama, Masaki; Namura, Yasuhiro; Tamura, Takahiko; Iwai, Hiroaki; Shimizu, Noriyoshi

    2013-01-01

    The relationship between orthodontic force and friction produced from an archwire and brackets affects the sliding of the wire in the leveling stage. The purpose of this study was to evaluate the relationship between force and friction in a small esthetic nickel-titanium (Ni-Ti) wire. Five esthetic wires (three coated and two plated) and two small, plain Ni-Ti wires (0.012 and 0.014 inches) were used. We performed a three-point bending test according to ISO 15841 and the drawing test with a dental arch model designed with upper linguoversion of the lateral incisor in the arch (displacements of 0.5, 1.0, 2.0 and 3.0 mm), and evaluated the relationship between them. Unloading bending forces of all wires at displacements of less than 1.0 mm were larger than friction forces, but all friction forces at displacements exceeding 2.0 mm were larger than unloading bending forces. The arch likely expands when displacement from the proximal brackets exceeds 1.0 mm. The friction force of a martensite 0.014-inch Ni-Ti wire was significantly greater than those of the other esthetic and austenitic wires. A wire with the smallest possible friction force should be used in cases with more than 1.0 mm displacement.

  3. Relationship between friction force and orthodontic force at the leveling stage using a coated wire

    Directory of Open Access Journals (Sweden)

    Masaki MURAYAMA

    2013-12-01

    Full Text Available The relationship between orthodontic force and friction produced from an archwire and brackets affects the sliding of the wire in the leveling stage. Objective: The purpose of this study was to evaluate the relationship between force and friction in a small esthetic nickel-titanium (Ni-Ti wire. Material and Methods: Five esthetic wires (three coated and two plated and two small, plain Ni-Ti wires (0.012 and 0.014 inches were used. We performed a three-point bending test according to ISO 15841 and the drawing test with a dental arch model designed with upper linguoversion of the lateral incisor in the arch (displacements of 0.5, 1.0, 2.0 and 3.0 mm, and evaluated the relationship between them. Results: Unloading bending forces of all wires at displacements of less than 1.0 mm were larger than friction forces, but all friction forces at displacements exceeding 2.0 mm were larger than unloading bending forces. The arch likely expands when displacement from the proximal brackets exceeds 1.0 mm. The friction force of a martensite 0.014-inch Ni-Ti wire was significantly greater than those of the other esthetic and austenitic wires. Conclusions: A wire with the smallest possible friction force should be used in cases with more than 1.0 mm displacement.

  4. Relationship between friction force and orthodontic force at the leveling stage using a coated wire

    Science.gov (United States)

    MURAYAMA, Masaki; NAMURA, Yasuhiro; TAMURA, Takahiko; IWAI, Hiroaki; SHIMIZU, Noriyoshi

    2013-01-01

    The relationship between orthodontic force and friction produced from an archwire and brackets affects the sliding of the wire in the leveling stage. Objective The purpose of this study was to evaluate the relationship between force and friction in a small esthetic nickel-titanium (Ni-Ti) wire. Material and Methods Five esthetic wires (three coated and two plated) and two small, plain Ni-Ti wires (0.012 and 0.014 inches) were used. We performed a three-point bending test according to ISO 15841 and the drawing test with a dental arch model designed with upper linguoversion of the lateral incisor in the arch (displacements of 0.5, 1.0, 2.0 and 3.0 mm), and evaluated the relationship between them. Results Unloading bending forces of all wires at displacements of less than 1.0 mm were larger than friction forces, but all friction forces at displacements exceeding 2.0 mm were larger than unloading bending forces. The arch likely expands when displacement from the proximal brackets exceeds 1.0 mm. The friction force of a martensite 0.014-inch Ni-Ti wire was significantly greater than those of the other esthetic and austenitic wires. Conclusions A wire with the smallest possible friction force should be used in cases with more than 1.0 mm displacement. PMID:24473722

  5. Relationship Between Different Types and Forms of Anti-Asthmatic Medications and Dental Caries in Three to 12 Year Olds

    Directory of Open Access Journals (Sweden)

    Alireza Heidari

    2016-11-01

    Full Text Available Objectives: Asthma is a common chronic disease. Asthma and anti-asthmatic medications have been suggested as risk factors for increased susceptibility to caries. This study was conducted to evaluate the effects of different types and forms of antihistaminic medications and the duration of drug consumption on the severity of dental caries in asthmatic children.Materials and Methods: This cross-sectional study was conducted in Asthma and Allergy Department of Children’s Medical Center in Tehran, Iran. Eighty-five children between three to 12 years who had been diagnosed with asthma, by means of taking medical history, clinical examination and spirometry were chosen by non-simple random sampling. The participants and their parents were interviewed. Oral examination was performed by a qualified dentist. The data were collected by use of questionnaires and analyzed by the stepwise multivariate linear regression analysis, using SPSS version 16. P<0.05 was considered statistically significant.Results: There was a significant correlation between the number of cetirizine and ketotifen tablets taken and decayed/missing/filled (dmf/DMF teeth score (P=0.006. There were no correlations between the number of consumed sprays and dmf/DMF score (P=0.923, the duration of drug therapy (P=0.907 or the type of medication taken including ß2 agonists, antihistamines, steroids or a combination of them (P=0.907.Conclusions: The present study showed that the tablet form of medications significantly increased the severity of dental caries even in presence of confounders (sex, age, duration of disease, tooth brushing, sugar consumption, fluoride therapy, mouth dryness.Keywords: Asthma; Anti-Asthmatic Agents; Dental Caries

  6. Relationship between fluoride intake in Serbian children living in two areas with different natural levels of fluorides and occurrence of dental fluorosis.

    Science.gov (United States)

    Mandinic, Zoran; Curcic, Marijana; Antonijevic, Biljana; Lekic, Charles P; Carevic, Momir

    2009-06-01

    The amount of fluoride present naturally in drinking water is highly variable, being dependent upon the individual geological environment from which the water is obtained. Chronic exposure to exceeding fluoride doses induces set of toxic effects, i.e. fluorosis. The aim of this study was to examine fluoride content in water and in the most frequently used vegetables, potato and bean, grown in two different Serbian regions, i.e. control region (Valjevo) and high naturally occurring fluoride region (Vranjska Banja), and moreover, to correlate estimated daily intake with dental fluorosis occurrence as an adverse effect of fluoride exposure of schoolchildren in Serbia. Study confirmed significant difference in fluoride content in water, potato and bean, consumed by 12-year-old children in two investigated municipalities. Results of the study indicated positive and statistically significant correlation between daily intake of fluoride and dental fluorosis level in the fluorotic municipality of Vranjska Banja (r = 0.61; p = 0.000017). Obtained relationship could be evaluated by means of binary logistic regression analysis, whereas probability for fluorosis occurrence could be predicted using the following equation: fluorosis occurence (%) = (34.852 x Cwater -12.644 x Cpotato - 9.362 x Cbean - 7.673) x 100 (Chi-Square (3) = 33.033; p < 0.001).

  7. 双歧杆菌及其与龋病的相关性研究进展%Bifidobacterium and related research progress on the relationship between the bacteria and dental caries

    Institute of Scientific and Technical Information of China (English)

    相艳(综述); 杜民权(审校)

    2013-01-01

    In recent years, in-depth studies on the relationship between Bifidobacterium and dental caries have gradually attracted increasing attention. This paper summarizes the classification and determination of Bifidobacterium, discusses the relationship between Bifidobacterium and dental caries, and investigates the function of Bifidobacterium in the developmental process of dental caries.%随着分子生物学及其技术的发展,双歧杆菌属与龋病间的关系备受人们的关注。本文就双歧杆菌的分类鉴定、与龋病发生的关系及在龋病发展过程中的作用等研究进展作一综述。

  8. Jaw muscle pain and its effect on gothic arch tracings.

    Science.gov (United States)

    Obrez, A; Stohler, C S

    1996-04-01

    Perceived changes in occlusion and decreased range of motion are often expressed by patients with masticatory muscle pain. The adverse loading of craniomandibular tissues that results from an inadequate maxillomandibular relationship in combination with the coexisting dysfunction is widely regarded as the cause of pain. This study was designed to test whether pain can cause significant changes in position of the mandible and therefore form the basis for any perceived changes in the maxillomandibular relationship. A second objective was to determine whether pain can cause changes in the mandibular range of motion. Five subjects who rated pain intensity on a visual analog scale were used in a single-blind, randomized, repeated-measures study design. Tonic muscle pain was induced by infusion of 5% hypertonic saline solution into the central portion of the superficial masseter muscle. Isotonic saline solution was used as a control, with subjects blinded to the type of substance given. The effect of pain on the position of the apex of the gothic arch tracing, the direction of the lateral mandibular border movements, and the mandibular range of motion was studied in a horizontal plane with minimal occlusal separation. Pain significantly affected the position of the apex of the gothic arch tracing in anterior (F = 11.46, p = 0.03) and transverse (F = 35.0, p = 0.004) directions. Similarly, pain affected the orientation of the mandibular lateral border movements (F = 12.44, p = 0.02) and their magnitude (F = 14.97, p = 0.01). All pain-induced effects proved to be reversible. The observed effect of pain can explain the perceived change of bite that is frequently noted by patients with orofacial pain. This study provided evidence of an alternative causal relationship between pain and changes in occlusal relationship and questions occlusal therapy as treatment, directed toward the elimination of the underlying cause in patients with masticatory muscle pain.

  9. Numerical analysis of ultimate strength of concrete filled steel tubular arch bridges

    Institute of Scientific and Technical Information of China (English)

    XIE Xu; CHEN Heng-zhi; Li Hui; SONG Shi-rui

    2005-01-01

    The calculation of ultimate bearing capacity is a significant issue in the design of Concrete Filled Steel Tubular (CFST)arch bridges. Based on the space beam theory, this paper provides a calculation method for determining the ultimate strength of CFST structures. The accuracy of this method and the applicability of the stress-strain relationships were validated by comparing different existing confined concrete uniaxial constitutive relationships and experimental results. Comparison of these results indicated that this method using the confined concrete uniaxial stress-strain relationships can be used to calculate the ultimate strength and CFST behavior with satisfactory accuracy. The calculation results are stable and seldom affected by concrete constitutive relationships. The method is therefore valuable in the practice of engineering design. Finally, the ultimate strength of an arch bridge with span of 330 m was investigated by the proposed method and the nonlinear behavior was discussed.

  10. Using a Visible Light-Polymerized Resin to Fabricate an Interim Partial Removable Dental Prosthesis.

    Science.gov (United States)

    Segal, Aaron; Yu, Hui Wen; Elkassaby, Heba

    2017-02-01

    An interim partial removable dental prosthesis (RDP) is any dental prosthesis that replaces some teeth in a partially dentate arch designed to enhance esthetics, stabilization, and/or function for a limited period of time, after which it is to be replaced by a definitive dental prosthesis. This article describes a technique that uses a visible light-polymerized (VLP) resin as the base material for an interim partial RDP. This technique can be easily accomplished in a dental office or laboratory and results in a predictable dental prosthesis. This technique eliminates the need for laboratory processing.

  11. 上颌异位尖牙埋伏阻生的辅弓矫治%The treatment of canine ectopic eruption with the auxiliary arch fragment

    Institute of Scientific and Technical Information of China (English)

    王德顺; 高益林; 谢小飞; 田瑞雪

    2011-01-01

    Objective To explore the treatment method of the vertical loop of auxiliary arch fragment in canine ectopic eruption with fixed orthodontic technique. Methods In 6 cases of ectopic maxillary canine a fixed orthodontic technique is used with the vertical loop of auxiliary arch fragment support. Results 6 cases of ectopic canine with the vertical loop of auxiliary arch fragment support have been aligned into the dental arch in about 12 months. Conclusion The ectopic canine can be aligned completely into the dental arch by means of the orthodontic technique without the tooth extraction.%目的:探讨垂直曲式的片段辅弓应用在尖牙异位萌出的固定矫治方法.方法:对6例上颌异位尖牙用垂直曲式的片段辅弓支持下,固定正畸技术进行矫治.结果:6例在片段辅弓固定矫治器支持下,12个月左右异位尖牙进入牙弓排齐.结论:上颌异位尖牙通过正畸技术完全能排入正常牙列,不需拔除.

  12. About Dental Amalgam Fillings

    Science.gov (United States)

    ... and Medical Procedures Dental Devices Dental Amalgam About Dental Amalgam Fillings Share Tweet Linkedin Pin it More ... should I have my fillings removed? What is dental amalgam? Dental amalgam is a dental filling material ...

  13. Dental Implant Surgery

    Science.gov (United States)

    ... here to find out more. Dental Implant Surgery Dental Implant Surgery Dental implant surgery is, of course, surgery, ... here to find out more. Dental Implant Surgery Dental Implant Surgery Dental implant surgery is, of course, surgery, ...

  14. Carbonic Anhydrase VI Gene Polymorphism rs2274327 Relationship Between Salivary Parameters and Dental-Oral Health Status in Children.

    Science.gov (United States)

    Sengul, Fatih; Kilic, Munevver; Gurbuz, Taskin; Tasdemir, Sener

    2016-08-01

    The aim of this study was to research carbonic anhydrase (CA) VI one single-nucleotide polymorphism (SNP) and its potential association with dental-oral health status (dental caries, Plaque Index (PI) and Gingival Index (GI)) and salivary parameters (salivary buffering capacity, salivary flow rate (SFR)) in children. A total of 178 children were divided into two groups: non-carious (n = 70, 34 boys and 36 girls) and carious (n = 108, 47 boys and 61 girls). The clinical evaluations were performed according to the decayed, missing, and filled teeth (dmft/DMFT) index by a specialist. Clinical parameters including PI, GI, and simplified oral hygiene index (OHI-S) were recorded. Salivary pH (SpH) was measured using pH paper. Blood samples and unstimulated whole saliva were collected, and SFR was calculated. The CA VI rs2274327 polymorphism was determined by a LightSNiP assay on the realtime PCR system. The frequencies of rs2274327 were not significant between groups (p > 0.05). There was a positive correlation between OHI-S and SpH in the carious and non-carious groups (p OHI-S, PI, GI, SFR, and SpH (p > 0.05). CA VI SNP (rs2274327) had no statistically significant association with OHI-S, PI, GI, SFR, and SpH in the children.

  15. Dental Sealants

    Science.gov (United States)

    ... Dates Electronic Submission of Applications Grants 101 (How to Write a Grant) Questions and Answers Grant Writing Tips ... offers strategies for providing oral care. NIDCR > Data & Statistics > Find Data by Topic > Dental Sealants Dental Sealants ...

  16. Dental Assistants

    Science.gov (United States)

    ... Z INDEX | OOH SITE MAP | EN ESPAÑOL Healthcare > Dental Assistants PRINTER-FRIENDLY EN ESPAÑOL Summary What They ... of workers and occupations. What They Do -> What Dental Assistants Do About this section Assistants prepare and ...

  17. Dental sealants

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/patientinstructions/000779.htm Dental sealants To use the sharing features on this ... case a sealant needs to be replaced. How Dental Sealants are Applied Your dentist applies sealants on ...

  18. Dental cavities

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/article/001055.htm Dental cavities To use the sharing features on this page, please enable JavaScript. Dental cavities are holes (or structural damage) in the ...

  19. DENTAL MATERIALS.

    Science.gov (United States)

    The study deals with the determination of characteristic physical and mechanical properties of restorative dental materials, and effect of...manipulative variables on these properties. From the study an entirely new dental gold inlay casting technic was developed, based on the principle of...controlled water added hygroscopic technic. The method has had successful dental applications and is a recognized method of dental inlay casting procedure

  20. A reappraisal of the quantitative relationship between sugar intake and dental caries: the need for new criteria for developing goals for sugar intake.

    Science.gov (United States)

    Sheiham, Aubrey; James, W Philip T

    2014-09-16

    There is a clear relation between sugars and caries. However, no analysis has yet been made of the lifetime burden of caries induced by sugar to see whether the WHO goal of 10% level is optimum and compatible with low levels of caries. The objective of this study was to re-examine the dose-response and quantitative relationship between sugar intake and the incidence of dental caries and to see whether the WHO goal for sugar intake of 10% of energy intake (E) is optimum for low levels of caries in children and adults. Analyses focused on countries where sugar intakes changed because of wartime restrictions or as part of the nutritional transition. A re-analysis of the dose-response relation between dietary sugar and caries incidence in teeth with different levels of susceptibility to dental caries in nationally representative samples of Japanese children. The impact of fluoride on levels of caries was also assessed. Meticulous Japanese data on caries incidence in two types of teeth show robust log-linear relationships to sugar intakes from 0%E to 10%E sugar with a 10 fold increase in caries if caries is assessed over several years' exposure to sugar rather than only for the first year after tooth eruption. Adults aged 65 years and older living in water fluoridated areas where high proportions of people used fluoridated toothpastes, had nearly half of all tooth surfaces affected by caries. This more extensive burden of disease in adults does not occur if sugar intakes are limited to fluoride is widely used. Adult as well as children's caries burdens should define the new criteria for developing goals for sugar intake.

  1. Evaluation of senior Brazilian dental students about mouth preparation and removable partial denture design.

    Science.gov (United States)

    Neto, Arcelino Farias; Duarte, Antônio Ricardo Calazans; Shiratori, Fábio Kenji; de Alencar e Silva Leite, Pedro Henrique; Rizzatti-Barbosa, Célia Marisa; Bonachela, Wellington Cardoso

    2010-11-01

    This study aimed to evaluate the knowledge of senior dental students about mouth preparation and removable partial denture (RPD) design. Two hundred sixty-six senior students from eleven dental schools in the State of São Paulo, Brazil, comprised the sample. The subjects examined two partially edentulous casts mounted on a semiadjustable articulator, answered a questionnaire regarding the treatment plan, and drew the RPD design. The casts consisted of Kennedy Class III, modification 1 maxillary arch and Class II mandibular arch. Ninety percent of the students believed that mouth preparation should be performed although no one was able to name all necessary procedures. For the maxillary arch, 12 percent of the denture designs were completely appropriate, 51 percent were partially appropriate, and 37 percent were inappropriate. For the mandibular arch, the results were 3 percent, 40 percent, and 57 percent, respectively.

  2. Geometrical Nonlinearity Analysis of the Steel Network Arch Bridges

    Directory of Open Access Journals (Sweden)

    Sigutė Žilėnaitė

    2016-12-01

    Full Text Available Arch bridges are one of the popular, oldest and graceful bridges which are being built in zones of the city and out of the city. However arches becomes especially sensitive to their buckling response due to dominated compressive force in the arch. In order to ensure stability conditions of the individual arch and arch bridges, it is estimated not just geometrical factor of arch, residual stress, work conditions, geometric imperfections but geometrical nonlinearity too. Geometric nonlinearity especially dominates in many times static indeterminable systems such as network arch bridges. However there are a few represents of estimation of geometric nonlinearity of the new construction form of the arch bridges created in a middle of 20th century. This paper represents estimation of geometric nonlinearity with numerical method of the steel arch bridges with vertical hangers and network arch bridges. There are determined stress-strain law and principal behavior of the steel network arch bridges under symmetric and asymmetric pedestrian loadings.

  3. In-plane elastic stability of fixed parabolic shallow arches

    Institute of Scientific and Technical Information of China (English)

    CAI JianGuo; FENG Jian; CHEN Yao; HUANG LiFeng

    2009-01-01

    The nonlinear behavior of fixed parabolic shallow arches subjected to a vertical uniform load is inves-tigated to evaluate the in-plane buckling load. The virtual work principle method is used to establish the non-linear equilibrium and buckling equations. Analytical solutions for the non-linear in-plane sym-metric snap-through and antisymmetric bifurcation buckling loads are obtained. Based on the least square method, an approximation for the symmetric buckling load of fixed parabolic arch is proposedto simplify the solution process. And the relation between modified slenderness and buckling modes are discussed. Comparisons with the results of finite element analysis demonstrate that the solutions are accurate. A cable-arch structure is presented to improve the in-plane stability of parabolic arches. The comparison of buckling loads between cable-arch systems and arches only show that the effect of cables becomes more evident with the increase of arch's modified slenderness.

  4. Anxiety and pain during dental injections

    NARCIS (Netherlands)

    van Wijk, A.J.; Hoogstraten, J.

    2009-01-01

    Objectives: The aim of this study was to study the relationship between anxiety and pain felt during a dental injection in a sample of ‘normal’ patients about to undergo ‘invasive’ dental treatment. Methods: Duration and intensity of pain during a dental injection were measured within a sample of

  5. Anxiety and pain during dental injections

    NARCIS (Netherlands)

    A.J. van Wijk; J. Hoogstraten

    2009-01-01

    Objectives: The aim of this study was to study the relationship between anxiety and pain felt during a dental injection in a sample of ‘normal’ patients about to undergo ‘invasive’ dental treatment. Methods: Duration and intensity of pain during a dental injection were measured within a sample of 24

  6. spaP gene of Streptococcus mutans in dental plaque and its relationship with early childhood caries.

    Science.gov (United States)

    Durán-Contreras, G L; Torre-Martínez, H H; de la Rosa, E I; Hernández, R M; de la Garza Ramos, M

    2011-12-01

    Streptococcus mutans and Streptococcus sobrinus are the main pathogens associated with the development of dental caries in humans. Recently, the real-time polymerase chain reaction (qPCR-TR) has been used for fast and exact quantification of these bacteria species. This molecular biology method has made the detection of these bacteria in saliva and dental plaque possible; additionally, it aids the development of illness risk prediction. The purpose of this prospective, analytic, transversal, observational and unicenter study was to quantify the spaP gene of the Streptococcus mutans and its correlation with caries in a group of children using isolated DNA from plaque samples processed through qPCR-TR, using specific oligonucleotides for this gene detection. The cariogenic potential of Streptococcus mutans in the dental plaque was analysed in a group of patients aged 12 to 46 months. A descriptive statistical analysis was performed. The Spearman's correlation coefficient was used to establish the correlation between caries (dmft) index (decayed/missing/filled primary teeth), spaP gene and age group. The Wilcoxon test was used to compare MSB cultivation technique and qPCR-TR. In the molecular trials, a close association between caries prevalence in childhood and the presence and high proportion of the spaP gene of S. mutans was found. The average caries prevalence was 3.71, and it increased as age range increased. The highest caries prevalence was observed in female patients and in the oldest age range studied (40 46 months) which contrasts with the 12-18 months age that had a caries (dmft) index of zero. The amplification using as initiator the gene spaP of the nucleic acids extracted from the S. mutans resulted positive in 91.3% of the cases. Every child with caries was positive for the spaP and only 8.75% were negative, this group included children without caries. In conclusion, there was a correlation with infant caries prevalence and S. mutans.

  7. Influence of deciduous canine extractions on incisor alignment, dental arch dimensions and dental fear

    OpenAIRE

    Sjögren, Anders

    2011-01-01

    Interception of crowding, by extraction of deciduous and permanent teeth, to eliminate or at least facilitate orthodontic treatment has a long tradition. This treatment procedure, know as “guided eruption” or “serial extraction” was re-introduced by Robert Hotz and Birger Kjellgren in 1947-48. The sequential extraction procedure begins with the removal of the deciduous canines in the early mixed dentition and additional extractions of deciduous first molars and permanent bicusp...

  8. Evolution Characteristic Analysis of Pressure-arch of a Double-arch Tunnel in Water-rich Strata

    Directory of Open Access Journals (Sweden)

    C. L. Li

    2016-03-01

    Full Text Available It is of importance to analyze the morphological characterization, the evolution process and the skewed effect of pressure-arch of a double-arch tunnel in the water-rich strata. Taking a buried depth 80 m double-arch tunnel as an example, a computational model of the double-arch tunnel was built by using FLAC3D technique. Then considering some aspects including groundwater conditions, tunnel depth, construction sequences and permeability coefficients, the coupling effect of stress field and seepage field in the pressure-arch of the double-arch tunnel was analyzed. The results show that the thickness of the pressure-arch induced by step-by-step excavation and display a step-descent skewed distribution from the left to the right of the double-arch tunnel. The permeability coefficient has a significant influence on the shape and the skewed effect of the pressure arch. The excavation of the bench method has a better arching condition than that of the expanding method. The abtained results provide a basic reference for the rock reinforcement design and safety construction of double-arch tunnels in the water-rich strata.

  9. The prevalence, causes, and relativity of dental anxiety in adult patients to irregular dental visits.

    Science.gov (United States)

    Gaffar, Balgis O; Alagl, Adel S; Al-Ansari, Asim A

    2014-06-01

    To assess the frequency and causes of dental anxiety and their relation to irregular dental visits among adult dental patients. The Dental Anxiety Question (DAQ) included within a self-administered questionnaire was distributed to 1025 patients attending the Interns' Dental Clinics in the Department of Preventive Dental Sciences, College of Dentistry, University of Dammam, Dammam, Kingdom of Saudi Arabia from March 2012 to February 2013. A cross-sectional study design was used. The questionnaire consisted of 22 closed-ended questions divided into 4 sections; 1) demographics, 2) regularity of dental visits, and related causes, 3) DAQ, cancellation of dental appointments, history of previous trauma, dental anxiety provoking factors within dental environment and procedures, and 4) patients' status in dental clinics, preferences of dentists, and perceptions regarding dental anxiety. The prevalence of dental anxiety among the study sample was 27%. Anesthetic injection was the main factor of dental fear (88.2%), while dental surgical procedures (35.7%) and extractions (23%) were the most terrifying dental procedures. Lack of time (79.5%), cost (71.5%), far-situated dental services (62.2%), and fear (57.1%) were causes listed for irregular dental visits; while 31.3% had no specific reason. Irregular dental visits were not related to dental anxiety. Dental anxiety continues to be an obstacle despite the vast improvement in dentistry; and this raises an alert regarding personal and communication factors in the patient-dentist relationship. Factors such as equal distribution of dental services, time, and cost should also be addressed.

  10. Multislice CT angiography of interrupted aortic arch

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Dong Hyun; Goo, Hyun Woo [Asan Medical Center, Department of Radiology and Research Institute of Radiology, Seoul (Korea); Seo, Dong-Man; Yun, Tae-Jin; Park, Jeong-Jun [Asan Medical Center, University of Ulsan College of Medicine, Department of Paediatric Cardiac Surgery, Seoul (Korea); Park, In-Sook; Ko, Jae Kon; Kim, Young Hwee [Asan Medical Center, University of Ulsan College of Medicine, Department of Paediatric Cardiology, Seoul (Korea)

    2008-01-15

    Interrupted aortic arch (IAA) is defined as complete luminal and anatomic discontinuity between the ascending and descending aorta. Because almost all patients with IAA become critically ill during the neonatal period, they should undergo urgent corrective surgery. This clinical urgency necessitates a fast and accurate noninvasive diagnostic method. Although echocardiography remains the primary imaging tool for this purpose, it is not always sufficient for planning surgical correction of IAA, principally due to a limited acoustic window and the inexperience of imagers. In this context, multislice CT angiography is regarded as an appropriate imaging technique complementary to echocardiography because it is fast, accurate, and objective for the diagnosis of IAA. In this article we describe what cardiac radiologists should know about IAA in their clinical practice, including clinicopathological features, CT features with contemporary surgical methods and postoperative complications, and differentiation from coarctation of the aorta and aortic arch atresia. (orig.)

  11. [Dental anatomy of dogs].

    Science.gov (United States)

    Sarkisian, E G

    2014-12-01

    The aim of the research was to investigate dog teeth anatomy as animal model for study of etiopathogenesis of caries disease and physiological tooth wear in human. After examining the dog's dental system, following conclusions were drawn: the dog has 42 permanent teeth, which are distributed over the dental arches not equally, and so the upper dentition consists of 20, and the lower of 22 teeth. The largest are considered upper fourth premolar and lower first molars, which are called discordant teeth. Between discordant teeth and fangs a dog has an open bite, which is limited to the top and bottom conical crown premolar teeth. Thus, in the closed position of the jaws, behind this occlusion is limited by discordant teeth, just in contact are smaller in size two molars. Only large dog's molars in a valid comparison can be likened to human molars, which allows us to use them in an analog comparison between them with further study of the morphological features ensure durability short-crown teeth and their predisposition to caries.

  12. Recurrent Pneumonia due to Double Aortic Arch

    Directory of Open Access Journals (Sweden)

    I. Sedighi

    2012-04-01

    Full Text Available Introduction: Pneumonia is one of the most common infections during childhood. In children with recurrent bacterial pneumonia complete evaluation for underlying factors is necessary. The most common underlying diseases include: antibody deficiencies , cystic fibrosis , tracheoesophageal fistula and increased pulmonary blood flow. Vascular ring and its pressure effect is a less common cause of stridor and recurrent pneumonia. Congenital abnormalities in aortic arch and main branches which form vascular ring around esophagus and trachea with variable pressure effect cause respiratory symptoms such as stridor , wheezing and recurrent pneumoniaCase Report: A 2 year old boy was admitted in our hospital with respiratory distress and cough . Chest x-Ray demonstrated right lobar pneumonia. He had history of stridor and wheezing from neonatal period and hospitalization due to pneumonia for four times. The patient received appropriate antibiotics. Despite fever and respiratory distress improvement, wheezing continued. Review of his medical documents showed fixed pressure effect on posterior aspect of esophagus in barium swallow. In CT angiography we confirmed double aortic arch.Conclusion: Double aortic arch is one of the causes of persistant respiratory symptom and recurrent pneumonia in children for which fluoroscopic barium swallow is the first non-invasive diagnostic method.(Sci J Hamadan Univ Med Sci 2012;19(1:70-74

  13. Effectiveness of a lower lingual arch as a space holding device.

    Science.gov (United States)

    Owais, A I; Rousan, M E; Badran, S A; Abu Alhaija, E S

    2011-02-01

    The aims of this study were to evaluate the effectiveness of a lower lingual holding arch (LLHA) in maintaining arch length, and to compare the effectiveness of two LLHAs made of two different gauges (0.9 and 1.25 mm) of stainless steel (SS) wire. The sample comprised 44 subjects (24 males and 20 females) who for various reasons attended orthodontic clinics at Jordan University of Science and Technology Dental Teaching Center. The subjects were randomly divided into two treatment groups. The first group contained 20 subjects (12 males/8 females, average age 10.76 ± 0.75 years). The LLHA used in this group was made of 0.9 mm SS wire. The second group comprised 24 subjects (12 males/12 females, average age 10.57 ± 0.54 years). The LLHA used in this group was made of 1.25 mm SS wire. The third group consisted of 23 subjects (15 males/8 females, average age 10.63 ± 0.66 years) who served as the control. The records consisted of lateral cephalograms, dental pantomograms, and study casts. Paired t-test, analysis of variance, and chi-square tests were used to determine whether significant differences existed between the groups. In both treatment groups, the lower incisors proclined and moved forward, and space loss of the lower primary second molar occurred. The LLHA made of 0.9 mm SS was superior to that made of 1.25 mm SS in terms of arch length preservation.

  14. Immediate loading with fixed full-arch prostheses in the maxilla: Review of the literature

    Science.gov (United States)

    Peñarrocha-Oltra, David; Covani, Ugo; Peñarrocha-Diago, Miguel

    2014-01-01

    conventional loading procedures. Key words:Immediate loading, full-arch, dental implants, loading protocols. PMID:24880445

  15. Relationship Between Dietary Sugar Intake and Dental Caries Among Japanese Preschool Children with Relatively Low Sugar Intake (Japan Nursery School SHOKUIKU Study): A Nationwide Cross-Sectional Study.

    Science.gov (United States)

    Saido, Miyuki; Asakura, Keiko; Masayasu, Shizuko; Sasaki, Satoshi

    2016-03-01

    The WHO has recently proposed to halve the recommendation for free sugar intake from 10 to 5 % of energy intake to reduce the incidence of diseases such as obesity and dental caries. The Japanese population is suitable to confirm the appropriateness of this proposal, because dietary sugar intake in Japan is exceptionally low among developed countries. We sought to establish a method to estimate dietary sugar intake in Japan and to examine the relationship between sugar and the number of dental caries using data obtained from the Japan Nursery School SHOKUIKU study. Dietary intake during the preceding month and the number of caries was examined in children aged 5-6 years using a brief-type self-administered diet history questionnaire for Japanese preschool children completed by their guardians and another questionnaire on lifestyle. Multivariate Poisson regression models were used for the analysis. When subjects were ranked into quintiles by the proportion of energy from free sugar, those in higher quintiles had more caries than those in the lowest quintile. On close analysis, the number of caries among children with a relatively small proportion of energy intake from free sugar (3.18-3.77 %) was not significantly different from that in the lowest group (0.95-3.17 %). The recent proposition of WHO might be valid, because the adverse effect of relatively small proportion (approximately less than 5 %) of energy intake from free sugar on caries was not detected among the subjects in this study. However, more study will be necessary to reach a conclusion.

  16. [Investigation of the relationship between oral and dental health and presence of Entamoeba gingivalis and Trichomonas tenax].

    Science.gov (United States)

    Özçelık, Semra; Gedık, Tuğçe; Gedık, Rüştü; Malatyali, Erdoğan

    2010-01-01

    Entamoeba gingivalis and Trichomonas tenax can cause gingivitis and scale. In this study, the prevalence of E. gingivalis and T. tenax were investigated among patients who were admitted to the Cumhuriyet University, Faculty of Dentistry. Two scraping samples were taken from 220 patients (ages varying from 12 to 75 years) and a questionnaire including fifteen parameters was applied to all patients. The samples were diluted in Physiological Saline and examined immediately by Tech Lab Entamoeba Kit and Robinson Medium. Oral protozoa were detected in 58 (26.4%) of 220 scraping samples. In 48 (21.8%) of the positive 58 specimens, E. gingivalis was detected alone whereas T. tenax was present in only two (1%) specimens. In 8 (3.6%) specimens, E. gingivalis and T. tenax were identified together. Gender, age groups, dental caries and the number, shape disorders, systemic diseases, tooth pain, joint problems and wisdom teeth were not found to be significant with the presence of oral protozoa. However, gum problems, presence of tartar, smoking habits, brushing habits and control habits were found to be statistically significantly related with the presence of oral protozoa. In the present study, E. gingivalis and T. tenax were found to be common. These parasites, with additional parameters, may lead to gingivitis and scale.

  17. Radiographic quantification of chronic dental infection and its relationship to the atherosclerotic process in the carotid arteries.

    Science.gov (United States)

    Friedlander, Arthur H; Sung, Eric C; Chung, Evelyn M; Garrett, Neal R

    2010-04-01

    Atherosclerosis may be initiated/accelerated by chronic dental infection (CDI). Noninvasively visualizing the carotid arteries is an accepted surrogate marker for determining coronary artery atherosclerosis (CAA). We hypothesized that 36 individuals with radiographic carotid atheromas would have more radiographic CDI than risk-matched individuals without atheromas. We determined the arithmetic sum of individuals' periapical and furcal lesions, pericoronitis sites, carious roots, teeth with pulpal caries, and vertical bony defects (>4 mm). Individuals with atheromas had a significantly (P < .01) greater mean score of 15.5 +/- 10.4 compared with control subjects (7.9 +/- 8.1). Similarly significant (P < .05) was the difference in the mean numbers of mesial and distal vertical bony defects in the atheroma group (4.1 +/- 3.9 and 4.8 +/- 3.8, respectively) compared with control subjects (1.6 +/- 2.4 and 1.8 +/- 2.7, respectively). Individuals with atheromas on their radiographs (and high probability of CAA) had significantly greater amounts of CDI than individuals without atheromas. Published by Mosby, Inc.

  18. The relationships between two different drinking water fluoride levels, dental fluorosis and bone mineral density of children.

    Science.gov (United States)

    Grobler, S R; Louw, A J; Chikte, U M E; Rossouw, R J; van W Kotze, T J

    2009-04-03

    This field study included the whole population of children aged 10-15 years (77 from a 0.19 mg/L F area; 89 from a 3.00 mg/L F area), with similar nutritional, dietary habits and similar ethnic and socioeconomic status. The fluoride concentration in the drinking water, the bone mineral content, the bone density and the degree of dental fluorosis were determined. The left radius was measured for bone width, bone mineral content, and bone mineral density. The mean fluorosis score was 1.3 in the low fluoride area and 3,6 in the high fluoride area. More than half the children in the low fluoride area had no fluorosis (scores 0 and 1) while only 5% in the high fluoride area had none. Severe fluorosis (30%) was only observed in the high fluoride area. The Wilcoxon Rank Sum Test indicated that fluorosis levels differed significantly (p density in the two areas (Spearment Rank correlations). A significant increase in bone width was found with age but no differences amongst and boys and girls. A significant positive correlation was found in the high fluoride area between bone mineral density over age. In the 12-13 and 13-14 year age groups in the high fluoride area, girls had higher bone mineral densities. However, a significant negative correlation (p<0.02) was found for the low fluoride area (0.19 mg/L F) over age.

  19. Observations on the relationship between the size of maxillary sinus detected on panoramic radiography and dental pathology

    Directory of Open Access Journals (Sweden)

    Grigorescu Catalin Cicerone

    2014-12-01

    Full Text Available The pathology of the teeth sinus (which by their apexes established direct neighborhood reports with maxillary sinus is a sensitive subject of modern dentistry. The implications of these neighborhood reports, it rests in establishing a treatment plan aimed at various fields of dentistry. If we were to detail, reports of the teeth sinus with maxillary sinus floor limit insertion of dental implants, for example, conditioning this therapeutic maneuver with combination or not with sinus elevation (process known as sinus lifting. In orthodontics, on the other hand, the presence of the maxillary sinus that is inserted through the roots of the teeth in lateral displacement limit the scope of the mesial-distal and / or in the vertical plane of these teeth in the remaining size of the alveolar bone, which allows the processes of absorption and bone in growth. Finally, sinus tooth apical processes, acute or chronic, often have echo in sinus pathology, which requires the patient to early orientation ENT service. Given all these considerations, an accurate determination of the size of the maxillary sinus panoramic radiography submit undeniable benefits in terms of establishing a treatment plan, limiting the maximum uncertainties related reports sinus tooth neighborhood.

  20. Accuracy of impressions obtained with dual-arch trays.

    Science.gov (United States)

    Wöstmann, Bernd; Rehmann, Peter; Balkenhol, Markus

    2009-01-01

    This study aimed to analyze the accuracy resulting from dual-arch impressions when compared to conventional impressions in complex preparations (ie, inlay and partial crown). One hundred eighty impressions were made using two different dual-arch trays; conventional trays served as the control. The accuracy of the dies obtained (Fuji-Rock EP, GC Europe) was assessed indirectly from the change of 59 transversal dimensions. Statistical analysis (t test, analysis of variance) revealed that less rigid dual-arch trays performed better than rigid ones. Though the inlay preparation was more difficult to reproduce with dual-arch trays, it can be concluded that the accuracy obtainable with nonrigid dual-arch trays is comparable to impressions taken from full-arch trays.

  1. Asymptotics of the QMLE for General ARCH(q) Models

    DEFF Research Database (Denmark)

    Kristensen, Dennis; Rahbek, Anders Christian

    2009-01-01

    Asymptotics of the QMLE for Non-Linear ARCH Models Dennis Kristensen, Columbia University Anders Rahbek, University of Copenhagen Abstract Asymptotic properties of the quasi-maximum likelihood estimator (QMLE) for non-linear ARCH(q) models -- including for example Asymmetric Power ARCH and log......-ARCH -- are derived. Strong consistency is established under the assumptions that the ARCH process is geometrically ergodic, the conditional variance function has a finite log-moment, and finite second moment of the rescaled error. Asymptotic normality of the estimator is established under the additional assumption...... that certain ratios involving the conditional variance function are suitably bounded, and that the rescaled errors have little more than fourth moment. We verify our general conditions, including identification, for a wide range of leading specific ARCH models....

  2. In-plane elastic stability of fixed parabolic shallow arches

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    The nonlinear behavior of fixed parabolic shallow arches subjected to a vertical uniform load is inves- tigated to evaluate the in-plane buckling load. The virtual work principle method is used to establish the non-linear equilibrium and buckling equations. Analytical solutions for the non-linear in-plane sym- metric snap-through and antisymmetric bifurcation buckling loads are obtained. Based on the least square method, an approximation for the symmetric buckling load of fixed parabolic arch is proposed to simplify the solution process. And the relation between modified slenderness and buckling modes are discussed. Comparisons with the results of finite element analysis demonstrate that the solutions are accurate. A cable-arch structure is presented to improve the in-plane stability of parabolic arches. The comparison of buckling loads between cable-arch systems and arches only show that the effect of cables becomes more evident with the increase of arch’s modified slenderness.

  3. Space maintenance in a child dental care program.

    Science.gov (United States)

    Hill, C J; Sorenson, H W; Mink, J R

    1975-04-01

    Five types of space maintainers were placed in 196 children participating in an extensive dental care program during a four-year study. Children with space maintainers were examined at six-month intervals. During the study, some sort of difficulty was encountered with 43% of the appliances inserted. The most common problem encountered was lost or missing appliances. Sixteen appliances had broken arch wires or loop wires; only ten broken bands were noted. Anther problem was distortion of arch wires. Suggestions are made for possible modifications in the space maintainers to reduce the incidence of problems.

  4. Aortic arch blunt injury in front-seat passenger.

    Science.gov (United States)

    Türkmen, Nursel; Eren, Bülent; Aydin, Şule Akköse

    2013-10-01

    Aortic arch blunt injury has highly lethal nature. Because the physical examination findings are subtle, immediate medical evaluation is very important. The case was a 72-year-old woman. Massive haemorrhage in the left haemotorax, contusion area in the left lung and a traumatic transection of the distal aortic arch was observed during autopsy. We described intersting autopsy case of aortic arch blunt injury.

  5. Critical thrombotic obstruction of transverse aortic arch in a neonate

    Directory of Open Access Journals (Sweden)

    Karunakar Vadlamudi

    2015-01-01

    Full Text Available A 3-day-old neonate presented with features suggestive of coarctation of aorta. Echocardiography showed a large organized thrombus in the transverse arch causing obstruction to theaortic arch and carotids with partial recanalization. Patient underwent surgical thromboendarterectomy with arch reconstruction. The evaluation did not reveal any hematological abnormalities and suspected to be due to fetal thromboembolism. Patient improved well, and no neurological deficits were observed during follow-up.

  6. An Electrostatically Actuated MEMS Arch Band-Pass Filter

    Directory of Open Access Journals (Sweden)

    Hassen M. Ouakad

    2013-01-01

    Full Text Available This work presents an investigation of the dynamics of micromachined arches resonators and their potential to be utilized as band-pass filters. The arches are actuated by a DC electrostatic load superimposed to an AC harmonic load. The dynamic response of the arch is studied analytically using a Galerkin-based reduced-order model when excited near its fundamental and third natural frequencies. Several simulation results are presented demonstrating interesting jumps and snap-through behavior of the arches and their attractive features for uses as band-pass filters, such as their sharp roll-off from pass bands to stop bands and their flat response.

  7. Right aortic arch with coarctation in Chinese children

    Energy Technology Data Exchange (ETDEWEB)

    Ming, Zhu; Aimin, Sun [Shanghai Children' s Medical Center, Department of Radiology, Shanghai (China)

    2008-05-15

    Because of the rarity of right aortic arch coarctation there are few reports of large groups of patients. To characterize the frequency and type of right aortic arch coarctation in a large group of pediatric patients. From June 1997 through May 2007, 11,276 consecutive children with congenital heart disease underwent multidetector CT (MDCT), MRI or angiocardiography examination. All children with a right aortic arch or coarctation were reviewed. Right aortic arch coarctation was found in 11 children representing 0.1% of the total group of 11,276 children, 1.7% of 658 children with native coarctations and 2.3% of 473 children with a right aortic arch. Among the 11 patients, 6 had long-segment narrowing and 7 had an aberrant left subclavian artery. MDCT, MRI and angiocardiography are reliable imaging techniques for the diagnosis of right aortic arch and coarctation. Our findings showed that the pattern of right aortic arch coarctation was different from that of left aortic arch coarctation, suggesting that they are different etiological entities. The pivotal role possibly played by flow dynamics in the development of right aortic arch coarctation is discussed. (orig.)

  8. Mathematical model of a moment-less arch.

    Science.gov (United States)

    Lewis, W J

    2016-06-01

    This paper presents a mathematical model for predicting the geometrical shapes of rigid, two-pin, moment-less arches of constant cross section. The advancement of this work lies in the inclusion of arch self-weight and the ability to produce moment-less arch forms for any span/rise ratio, and any ratio of uniformly distributed load per unit span, w, to uniformly distributed arch weight per unit arch length, q. The model is used to derive the shapes of two classical 'moment-less' arch forms: parabolic and catenary, prior to demonstrating a general case, not restricted by the unrealistic load assumptions (absence of q, in the case of a parabolic form, or no w, in the case of a catenary arch). Using the same value of span/rise ratio, and w/q>1, the behaviour of the moment-less and parabolic arches under permanent loading, (w+q), is analysed. Results show the former to be developing much lower stresses than its parabolic rival, even when there are relatively small differences in the two geometries; for a medium span/rise ratio of 4 and w/q=2, differences in the parabolic and moment-less arch geometries would, in practical terms, be viewed as insignificant, but the stresses in them are different.

  9. Children's experiences of dental anxiety.

    Science.gov (United States)

    Morgan, Annie G; Rodd, Helen D; Porritt, Jenny M; Baker, Sarah R; Creswell, Cathy; Newton, Tim; Williams, Chris; Marshman, Zoe

    2017-03-01

    Dental anxiety is common among children. Although there is a wealth of research investigating childhood dental anxiety, little consideration has been given to the child's perspective. This qualitative study sought to explore with children their own experiences of dental anxiety using a cognitive behavioural therapy assessment model. Face-to-face, semi-structured interviews were conducted with dentally anxious children aged 11-16 years. The Five Areas model was used to inform the topic guide and analysis. Data were analysed using a framework approach. In total, 13 children were interviewed. Participants described their experiences of dental anxiety across multiple dimensions (situational factors and altered thoughts, feelings, physical symptoms, and behaviours). Participants placed considerable value on communication by dental professionals, with poor communication having a negative influence on dental anxiety and the dentist-patient relationship. This study confirms the Five Areas model as an applicable theoretical model for the assessment of childhood dental anxiety. Children provided insights about their own dental anxiety experiences that have not previously been described. © 2016 BSPD, IAPD and John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  10. Confronting shibboleths of dental education.

    Science.gov (United States)

    Masella, Richard S

    2005-10-01

    Shibboleths are common expressions presented as indisputable truths. When used in educational discussions, they reflect "motherhood and apple pie" viewpoints and tend to bring debate to a halt. Use of shibboleths may precede a desired imposition of "locksteps" in educational programming and are easily perceived as paternalistic by recipients. Nine shibboleths are presented as common beliefs of dental faculty and administrators. Evidence contradicting the veracity of the "obvious truths" is offered. The traditional "splendid isolation" of dentistry contributes to parochialism and belief in false shibboleths. Sound principles of higher and health professions education, student learning, and dental practice apply to dental education as to all health disciplines. Student passivity in dental education is not the best preparation for proficiency in dental practice. The master teacher possesses a repertoire of methodologies specific to meeting defined educational objectives. Active learning experiences bear close resemblances to professional duties and responsibilities and internally motivate future doctors of dental medicine. The difficulty in achieving curricular change leads to curricular entrenchment. Dentistry and dental education should not trade their ethical high ground for the relatively low ethical standards of the business world. Principles of professional ethics should govern relationships between dentists, whether within the dental school workplace or in practice. Suggestions are made on how to confront shibboleths in dental school settings.

  11. Cognitive vulnerability and dental fear

    Directory of Open Access Journals (Sweden)

    Spencer A John

    2008-01-01

    Full Text Available Abstract Background The Cognitive Vulnerability Model proposes that perceptions of certain characteristics of a situation are critical determinants of fear. Although the model is applicable to all animal, natural environment and situational fears, it has not yet been applied specifically to dental fear. This study therefore aimed to examine the association between dental fear and perceptions of dental visits as uncontrollable, unpredictable and dangerous. Methods The study used a clustered, stratified national sample of Australians aged 15 years and over. All participants were asked in a telephone interview survey to indicate their level of dental fear. Participants who received an oral examination were subsequently provided with a self-complete questionnaire in which they rated their perceptions of uncontrollability, unpredictability and dangerousness associated with dental visiting. Results 3937 participants were recruited. Each of the three vulnerability-related perceptions was strongly associated with the prevalence of high dental fear. In a logistic regression analysis, uncontrollability and dangerousness perceptions were significantly associated with high dental fear after controlling for age and sex. However, unpredictability perceptions did not have a statistically significant independent association with dental fear after controlling for all other variables. Conclusion Results are mostly consistent with the Cognitive Vulnerability Model of the etiology of fear, with perceptions of uncontrollability, unpredictability and dangerousness each showing a strong bivariate relationship with high dental fear prevalence. However, more extensive measures of vulnerability perceptions would be valuable in future investigations.

  12. [Single coronary artery and right aortic arch].

    Science.gov (United States)

    Martínez-Quintana, Efrén; Rodríguez-González, Fayna

    2015-01-01

    Coronary anomalies are mostly asymptomatic and diagnosed incidentally during coronary angiography or echocardiography. However, they must be taken into account in the differential diagnosis of angina, dyspnea, syncope, acute myocardial infarction or sudden death in young patients. The case is presented of two rare anomalies, single coronary artery originating from right sinus of Valsalva and right aortic arch, in a 65 year-old patient with atherosclerotic coronary artery disease treated percutaneously. Copyright © 2014 Sociedad Española de Arteriosclerosis. Published by Elsevier España. All rights reserved.

  13. A Functional Version of the ARCH Model

    CERN Document Server

    Hormann, Siegfried; Reeder, Ron

    2011-01-01

    Improvements in data acquisition and processing techniques have lead to an almost continuous flow of information for financial data. High resolution tick data are available and can be quite conveniently described by a continuous time process. It is therefore natural to ask for possible extensions of financial time series models to a functional setup. In this paper we propose a functional version of the popular ARCH model. We will establish conditions for the existence of a strictly stationary solution, derive weak dependence and moment conditions, show consistency of the estimators and perform a small empirical study demonstrating how our model matches with real data.

  14. A Binomial Integer-Valued ARCH Model.

    Science.gov (United States)

    Ristić, Miroslav M; Weiß, Christian H; Janjić, Ana D

    2016-11-01

    We present an integer-valued ARCH model which can be used for modeling time series of counts with under-, equi-, or overdispersion. The introduced model has a conditional binomial distribution, and it is shown to be strictly stationary and ergodic. The unknown parameters are estimated by three methods: conditional maximum likelihood, conditional least squares and maximum likelihood type penalty function estimation. The asymptotic distributions of the estimators are derived. A real application of the novel model to epidemic surveillance is briefly discussed. Finally, a generalization of the introduced model is considered by introducing an integer-valued GARCH model.

  15. Relationship between self- perception of malodour and actual estimation of malodour in a group of dental patients.

    Science.gov (United States)

    Ehizele, A O; Ojehanon, P I

    2013-12-01

    The aim of this study was to determine the relationship between the concentration of volatile sulphur compounds in mouth air of young adult and their self perception of malodour and also to determine the relationship between the organoleptic assessment of young adult and their perception of malodour. A total of 400 willing participants were studied and they were grouped into two based on the health of their periodontium. Subjects were asked for self perception of malodour and organoleptic assessment was done to assess the level of malodour using the Rosenberg 0-5 scoring system. The concentration of volatile sulphur compounds (VSC) was determined objectively using the Halimeter. Eighty subjects reported self perception of malodour i.e. 39 males (48.7%) and 41 females (51.3%). Only 9% of the subjects without periodontal diseases reported self perception of oral malodour while 31% of subjects with periodontal disease had similar claims. Majority (86%) of those who had VSC concentration less than 181 ppb claimed to have no self perception of malodour while 41% of those who had VSC concentration greater than 250 ppb had self perception of malodour. More than half (53.8%) of subjects with VSC concentration greater than 250 ppb had organoleptic score of 3. Half of subjects with organoleptic assessment score of 3 had self perception of malodour. It can be concluded from this study that a relationship exists between self-perception of oral malodour, organoleptic assessment and the concentration of volatile sulphur compounds in mouth air of subjects.

  16. Arch width changes in patients with Class II division 1 malocclusion treated with maxillary first premolar extraction and non-extraction method.

    Science.gov (United States)

    Shirazi, Sajjad; Kachoei, Mojgan; Shahvaghar-Asl, Naiemeh; Shirazi, Samaneh; Sharghi, Reza

    2016-10-01

    The aim of this study was to determine arch width changes during maxillary first premolars extraction and non-extraction treatment in patients with Class II division 1 malocclusion. Dental casts of 91 Class II division 1 patients (36 males and 55 females) were evaluated. The minimum age of the subjects at the beginning of treatment was above 16 years. 48 patients were treated with extraction of the maxillary first premolars and 43 patients were treated without extraction. Pre- and post-treatment maxillary and mandibular inter-canine and inter-molar arch widths were measured. At the end of treatment, maxillary and mandibular inter-canine widths of both groups increased significantly. The maxillary inter-molar width decreased in the extraction group and increased in the non-extraction group. The mandibular inter-molar width increased significantly in both groups. No significant differences were observed between males and females. The results of this study indicated that there was a tendency for an increase in arch width during both the extraction and non-extraction treatment except maxillary inter-molar width in the extraction cases. Key words:Dental arch, malocclusion, angle Class II, tooth movement, extraction.

  17. Arch width changes in patients with Class II division 1 malocclusion treated with maxillary first premolar extraction and non-extraction method

    Science.gov (United States)

    Shirazi, Sajjad; Kachoei, Mojgan; Shahvaghar-Asl, Naiemeh; Shirazi, Samaneh

    2016-01-01

    Background The aim of this study was to determine arch width changes during maxillary first premolars extraction and non-extraction treatment in patients with Class II division 1 malocclusion. Material and Methods Dental casts of 91 Class II division 1 patients (36 males and 55 females) were evaluated. The minimum age of the subjects at the beginning of treatment was above 16 years. 48 patients were treated with extraction of the maxillary first premolars and 43 patients were treated without extraction. Pre- and post-treatment maxillary and mandibular inter-canine and inter-molar arch widths were measured. Results At the end of treatment, maxillary and mandibular inter-canine widths of both groups increased significantly. The maxillary inter-molar width decreased in the extraction group and increased in the non-extraction group. The mandibular inter-molar width increased significantly in both groups. No significant differences were observed between males and females. Conclusions The results of this study indicated that there was a tendency for an increase in arch width during both the extraction and non-extraction treatment except maxillary inter-molar width in the extraction cases. Key words:Dental arch, malocclusion, angle Class II, tooth movement, extraction. PMID:27703608

  18. Three-dimensional measurement of foot arch in preschool children

    Directory of Open Access Journals (Sweden)

    Chang Hsun-Wen

    2012-09-01

    Full Text Available Abstract Background The prevalence of flexible flatfoot is high among preschool-aged children, but the effects of treatment are inconclusive due to the unclear definitions of normal flatfoot. To date, a universally accepted evaluation method of the foot arch in children has not been completely established. Our aims of this study were to establish a new method to evaluate the foot arch from a three dimensional perspective and to investigate the flexibility of the foot arch among children aged from two to six. Methods A total of 44 children aged from two to six years of age were put into five age groups in this study. The navicular height was measured with one leg standing, and both feet were scanned separately in both sitting and one leg standing positions to compute the foot arch volume. The arch volume index, which represents the ratio of the difference in volume between sitting and one leg standing positions to the volume when sitting was calculated to demonstrate the flexibility of the foot arch. The differences of measured parameters between each aged group were analyzed by one-way ANOVA. Results The arch volumes when sitting and standing were highly correlated with the navicular height. The navicular height ranged from 15.75 to 27 mm, the arch volume when sitting ranged from 6,223 to 11,630 mm3, and the arch volume when standing from 3,111 to 7,848 mm3 from two to six years of age. The arch volume index showed a declining trend as age increased. Conclusion This study is the first to describe the foot arch with volume perspective in preschool-aged children. The foot arch volume was highly correlated with the navicular height. Research results show both navicular height index and arch volume index gradually increase with age from two to six. At the same time the arch also becomes rigid with age from two to six. These results could be applied for clinical evaluation of the foot arch and post-treatment evaluation.

  19. Dental Hygienist.

    Science.gov (United States)

    Ohio State Univ., Columbus. Center on Education and Training for Employment.

    This document, which is designed for use in developing a tech prep competency profile for the occupation of dental hygienist, lists technical competencies and competency builders for 13 units pertinent to the health technologies cluster in general and 9 units specific to the occupation of dental hygienist. The following skill areas are covered in…

  20. Numerical investigation on thermal striping conditions for a tee junction of LMFBR coolant pipes. 6. Numerical evaluations of arched-vortex characteristics in non-isothermal fields

    Energy Technology Data Exchange (ETDEWEB)

    Murakami, Satoshi [Customer System Co. Ltd. (Japan); Muramatsu, Toshiharu [Japan Nuclear Cycle Development Inst., Oarai, Ibaraki (Japan). Oarai Engineering Center

    2002-05-01

    Numerical analyses for turbulence thermal mixing, the aim of which is to evaluate relationship between hydrodynamics and temperature distribution of an arched-vortex, were carried out using the direct numerical simulation code DINUS-3. From the analyses, the following results have been obtained: (1) Transportation period of the arched-vortex and distance between the arched-vortices were kept constant in isothermal and non-isothermal conditions. (2) The transportation period of arched-vortex was decreased with increasing Reynolds number under the condition of the constant flow velocity ratio between both coolant pipes. (3) One of the main reasons for this behavior was considered that the motion of the cold fluid flowing out of the branch pipe was restricted by the difference of fluid density between the branch and the main pipes. The amplitudes of the cross flow velocity fluctuation in the leg region of the arched-vortex were larger than those under isothermal condition. (4) It was confirmed that the arched-vortex consists of two kinds of vortexes, i.e., a longitudinal vortex generated by a shear motion at the top of the arched-vortex, and a horizontal vortex by shedding motion at both sides of the branch jet flow. (author)

  1. Isolated right aortic arch: Antenatal evaluation

    Directory of Open Access Journals (Sweden)

    Ali Babacan

    2015-06-01

    Full Text Available Aortic arch abnormalities are the least frequently prenatally diagnosed congenital cardiac abnormalities. Right aortic arch (RAA identified in prenatal period is associated frequently with other cardiac/non-cardiac malformations, notably tracheal or esophageal compression and microdeletions 22q11. Intrauterine and postnatal survey of the fetus depends on these anomalies and their effects. Aortic arc variations, particularly RAA, can be diagnosed accurately by fetal echocardiography. Elaborated fetal cardiac and extracardiac evaluation should be undertaken in all cases of RAA by using Doppler ultrasound. Also cytogenetic testing for 22q11 microdeletions should be considered carefully. Nonetheless, it should be kept in mind that isolated RAA has a good prognosis, and in the majority of the patients, it is an asymptomatic vascular variant with a relatively low risk for chromosomal anomaly. In this paper with this case, we aim to evaluate the prenatal findings, associated conditions and prognosis of prenatally detected RAA anomalies in the light of literatures. J Clin Exp Invest 2015; 6 (2: 192-195

  2. Blood flow characteristics in the aortic arch

    Science.gov (United States)

    Prahl Wittberg, Lisa; van Wyk, Stevin; Mihaiescu, Mihai; Fuchs, Laszlo; Gutmark, Ephraim; Backeljauw, Philippe; Gutmark-Little, Iris

    2012-11-01

    The purpose with this study is to investigate the flow characteristics of blood in the aortic arch. Cardiovascular diseases are associated with specific locations in the arterial tree. Considering atherogenesis, it is claimed that the Wall Shear Stress (WSS) along with its temporal and spatial gradients play an important role in the development of the disease. The WSS is determined by the local flow characteristics, that in turn depends on the geometry as well as the rheological properties of blood. In this numerical work, the time dependent fluid flow during the entire cardiac cycle is fully resolved. The Quemada model is applied to account for the non-Newtonian properties of blood, an empirical model valid for different Red Blood Cell loading. Data obtained through Cardiac Magnetic Resonance Imaging have been used in order to reconstruct geometries of the the aortic arch. Here, three different geometries are studied out of which two display malformations that can be found in patients having the genetic disorder Turner's syndrome. The simulations show a highly complex flow with regions of secondary flow that is enhanced for the diseased aortas. The financial support from the Swedish Research Council (VR) and the Sweden-America Foundation is gratefully acknowledged.

  3. Stereoscopy in Dental Education

    DEFF Research Database (Denmark)

    Murakami, Shumei; Verdonschot, Rinus G; Kreiborg, Sven

    2017-01-01

    The aim of this study was to investigate whether stereoscopy can play a meaningful role in dental education. The study used an anaglyph technique in which two images were presented separately to the left and right eyes (using red/cyan filters), which, combined in the brain, give enhanced depth...... perception. A positional judgment task was performed to assess whether the use of stereoscopy would enhance depth perception among dental students at Osaka University in Japan. Subsequently, the optimum angle was evaluated to obtain maximum ability to discriminate among complex anatomical structures. Finally...... practice, they did recognize its merits for education. These results suggest that using stereoscopic images in dental education can be quite valuable as stereoscopy greatly helped these students' understanding of the spatial relationships in complex anatomical structures....

  4. 安氏Ⅱ1类错(牙合)拔牙矫治后牙弓形态的变化%Change of arch form after extraction treatment on patients with Angle Ⅱ1 malocclusion

    Institute of Scientific and Technical Information of China (English)

    壮荣; 刘洋; 周云; 晏燕; 曹军

    2014-01-01

    目的:观察安氏Ⅱ1类错(牙合)患者拔牙矫治后牙弓形态的变化规律,为临床治疗该类畸形提供参考.方法:选择拔除4个第一前磨牙进行正畸治疗的安氏Ⅱ1错(牙合)患者30例,取矫治前后石膏模型,通过三维扫描生成数字化牙颌模型,同时建立计算机牙弓形态定量分析系统,通过定位标志点,在牙弓形态分析平面上获取各个牙位的坐标数据,利用三次方程式拟合牙弓曲线,测量牙弓宽度及长度的变化,量化牙弓形态的变化.结果:安氏Ⅱ1类错(牙合)经过拔牙矫治后,①上颌侧切牙区以及尖牙区牙弓宽度明显增加(P <0.01,P<0.05),下颌侧切牙区和尖牙区牙弓宽度无明显变化;②上、下颌前磨牙区及磨牙区牙弓宽度明显减小(P<0.001);③矫治后上、下颌尖牙区长度明显增加(P<0.05),磨牙区长度明显减小(P<0.001).结论:安氏Ⅱ1类错(牙合)拔牙矫治后,上颌前部牙弓变宽,后部牙弓变窄,下颌前部牙弓形态未见明显缩窄.%Objective:To compare and analyze the changes in the arch form after extraction treatment for patients with Angle Ⅱ 1 malocclusion.Methods:A total of 30 patients with Angle Ⅱ1 malocclusion were selected.Before and after tooth extraction treatment,dental cast were obtained and generated the digital dental model by 3-D scanning.Then we positioned the landmark and fitted curve of dental arch,measured dental arch width and length,analyzed the change of the dental arch form by using the computerized system for the arch form quantitative analysis.Results:After the extraction treatment for patients with Angle Ⅱ 1 malocclusion:Dental arch width of maxillary lateral incisor and canines zone had significantly increased after treatment (P < 0.01,P < 0.05),while mandibular lateral incisor and canines zone had no obvious change ; dental arch width of premolar and molar had significantly decreased both in maxillary and mandible (P <0.001); and dental

  5. The relationship between dental fluorosis and tooth fluoride concentration - a study in an endemic area - doi:10.5020/18061230.2011.p355

    Directory of Open Access Journals (Sweden)

    Marc Daniel Grynpas

    2012-01-01

    Full Text Available Objective: To determine the relationship between dental fluorosis (DF severity and fluoride [F] concentration in tooth and water in DF endemic areas. Methods: Life-long residents from two DF endemic communities were studied. Forty-five extracted teeth were collected and analyzed for DF severity and tooth [F]. Thylstrup-Ferjeskov Index (TFI was used to measure DF severity and instrumental neutron activation analysis (INAA for tooth [F] concentration. Water from regional wells was also collected (n=9 and analyzed for F content using specific ion F electrode. Results: Water [F] varied between 0.2ppm and 4.7ppm. TFI scores ranged from 0 to 6; [F] from 120ppm to 2,140ppm in enamel and 304ppm to 4,800ppm in dentin. No correlation was found between DF severity and [F] in enamel (rs=0.22,p=0.15 and dentin (rs=-0.19,p=0.20, nor between water [F] and [F] in enamel (rs=-0.09,p=0.65 and dentin (rs=-0.11,p=0.56. Weak correlation between DF severity and water [F] (rs=0.38,p=0.04 was found. Linear regression analysis showed that TFI couldn’t be predicted from a linear combination of the independent variables (age, enamel and dentin [F]. When enamel, dentin and water [F] were used as independent variables in the linear regression (predict DF severity, only water [F] showed influence in DF severity (p=0.013;t=2.67. Conclusion: Even in areas of endemic DF, tooth [F] didn’t correlate with DF severity and the relationship between water [F] and DF severity was very weak. Therefore, tooth [F] may not be a good predictor/indicator of DF severity.

  6. Arch width changes in patients with Class II division 1 malocclusion treated with maxillary first premolar extraction and non-extraction method

    OpenAIRE

    Shirazi, Sajjad; Kachoei, Mojgan; Shahvaghar-Asl, Naiemeh; Shirazi, Samaneh; Sharghi, Reza

    2016-01-01

    Background The aim of this study was to determine arch width changes during maxillary first premolars extraction and non-extraction treatment in patients with Class II division 1 malocclusion. Material and Methods Dental casts of 91 Class II division 1 patients (36 males and 55 females) were evaluated. The minimum age of the subjects at the beginning of treatment was above 16 years. 48 patients were treated with extraction of the maxillary first premolars and 43 patients were treated without ...

  7. Level-ARCH Short Rate Models with Regime Switching

    DEFF Research Database (Denmark)

    Christiansen, Charlotte

    This paper introduces regime switching volatility into level- ARCH models for the short rates of the US, the UK, and Germany. Once regime switching and level effects are included there are no gains from including ARCH effects. It is of secondary importance exactly how the regime switching...

  8. Defect in Posterior Arch of Atlas in Myelomeningocele

    NARCIS (Netherlands)

    G. Blaauw (Gerhard)

    1971-01-01

    textabstractThe posterior arches of the cervical vertebrae of 30 children who died with a myelomeningocele in the lower thoracic, lumbar or sacral region were examined; in 70 per cent of these cases a defect was found in the posterior arch of the atlas, which was bridged by a firm fibrous band. Alté

  9. Modelling subset multivariate ARCH model via the AIC principle

    Institute of Scientific and Technical Information of China (English)

    2002-01-01

    In this paper we consider the problem of identifying a parsimonious subset multivariate ARCH model based on the AIC principle. The proposed approach can reduce the number of parameters in the final ARCH specification and allows for non-constant correlations between the components. Some simulation results illustrate the viability of the proposed procedure.

  10. Defect in Posterior Arch of Atlas in Myelomeningocele

    NARCIS (Netherlands)

    G. Blaauw (Gerhard)

    1971-01-01

    textabstractThe posterior arches of the cervical vertebrae of 30 children who died with a myelomeningocele in the lower thoracic, lumbar or sacral region were examined; in 70 per cent of these cases a defect was found in the posterior arch of the atlas, which was bridged by a firm fibrous band. Alté

  11. Double aortic arch and nasogastric tubes: A fatal combination

    Institute of Scientific and Technical Information of China (English)

    Julia Massaad; Kelly Crawford

    2008-01-01

    Double aortic arch is a common form of complete vascular ring that encircles both the trachea and the esophagus, and presents with various respiratory and esophageal symptoms, usually in the pediatric population.We present a case of double aortic arch in an adult patient that manifested as massive upper gastrointestinal bleeding after prolonged nasogastric intubation.

  12. Adult presentation with vascular ring due to double aortic arch.

    Science.gov (United States)

    Kafka, Henryk; Uebing, Anselm; Mohiaddin, Raad

    2006-11-01

    This is a case report on the use of cardiovascular magnetic resonance imaging to diagnose vascular ring due to double aortic arch in an adult presenting with an abnormal chest X-ray. The experience in this case and the literature review identify the benefits of using cardiovascular magnetic resonance imaging to clarify complex aortic arch anatomy.

  13. Twin - Arch technique. Revival of the "edgewise -Technique"?

    Directory of Open Access Journals (Sweden)

    Jacob Karp

    2012-01-01

    The SNB – Bracket brings a new dimension into the orthodontic world which is most apparent in extraction cases. Its Teflon – like material has a very low friction coefficient thus, reducing the treatment time considerably. Through the use of low dimensioned arch wires, the Twin – Arch Technique becomes a Light – wire system and simultaneously provides good anchorage and torque control.

  14. Full-scale load tests of Pearl-Chain arches

    DEFF Research Database (Denmark)

    Halding, Philip Skov; Hertz, Kristian Dahl; Schmidt, Jacob Wittrup

    2017-01-01

    , pre-fabricated, composite, lightweight, concrete deck elements (SL-Decks), that are post-tensioned together into an arch shape. The two Pearl-Chain arches, each with a span of 13m and a rise of 1m, were placed on a post tensioned bearing plate prepared in advance. The aches are tested with load...

  15. The Gothic arch tracing and transfer for the centric relation of edentulous arches%无牙颌正中关系位的哥特式弓描记与转移

    Institute of Scientific and Technical Information of China (English)

    吴国锋

    2011-01-01

    目前一般认为确定无牙颌水平关系即确定正中关系位,哥特式弓描记法是唯一在确定关系时可客观观察下颌后退程度的方法.它利用固定于上下颌弓上的装置记录下颌运动时的信息,描记出雨伞状的划痕,雨伞顶点即被认为是正中关系位点.本文详细介绍了利用哥特式弓描记法记录与转移正中关系位的临床规范操作方法,主要内容包括安装描记盘、固定描记针、口内描记、记录正中关系位和转移至(牙)架等操作,每一步操作都通过相应的临床图片进行详细说明.%The present accepted definition of horizontal relation for edentulous arches is based upon the relationship of centric relation. The Gothic arch tracing is the only visual device for ascertaining the horizontal relationship of mandibular positions and two dimensional movements. A tracing of mandibular movements made by means of a device attached to the opposing arches; its shape resembles that of an um-brella head or a Gothic arch, and when the instruments marking point ia at the apex of the arch, the jaws are considered to be in centric relation. This article introduces the detailed information and illustrates in meticulous detail with high quality photographs the clinical steps of Gothic arch tracing process, such as the setting tracing plate and needle. The intraoral tracing and the transfer to articulator are described.

  16. Atlantoaxial stabilization using multiaxial C-1 posterior arch screws.

    Science.gov (United States)

    Donnellan, Michael B; Sergides, Ioannis G; Sears, William R

    2008-12-01

    The authors present a novel technique of atlantoaxial fixation using multiaxial C-1 posterior arch screws. The technique involves the insertion of bilateral multiaxial C-1 posterior arch screws, which are connected by crosslinked rods to bilateral multiaxial C-2 pars screws. The clinical results are presented in 3 patients in whom anomalies of the vertebral arteries, C-1 lateral masses, and/or posterior arch of C-1 presented difficulty using existing fixation techniques with transarticular screws, C-1 lateral mass screws, or posterior wiring. The C-1 posterior arch screws achieved solid fixation and their insertion appeared to be technically less demanding than that of transarticular or C-1 lateral mass screws. This technique may reduce the risk of complications compared with existing techniques, especially in patients with anatomical variants of the vertebral artery, C-1 lateral masses, or C-1 posterior arch. This technique may prove to be an attractive fixation option in patients with normal anatomy.

  17. Effect of Obesity on Arch Index in Young Adults

    Directory of Open Access Journals (Sweden)

    Sneha Sameer Ganu

    2013-01-01

    Full Text Available Background: Excessive increases in weight bearing forces caused by obesity may negatively affect the lower limbs and feet but minimal research has examined the long-term loading effects of obesity on the musculoskeletal system, particularly in reference to the feet. Objectives: The purpose of the study was to investigate the effect of obesity on medial longitudinal arch of foot in young adults. Method: 60 subjects, 30 obese & 30 non obese were assessed for height & weight using standard technique. Radiographic images under static condition were used for calculating the arch index. Result: The arch index of obese subjects was significantly lower than the non obese subjects & there is a negative correlation between the BMI & the arch index. Conclusion: These results suggests that obesity lowers the medial longitudinal arch of foot.

  18. Analysis of the peri-implant microbiota in 90 dental implants and its relationship to crevicular fluid volume.

    Science.gov (United States)

    Ata-Ali, J; Flichy-Fernández, A-J; Alegre-Domingo, T; Candel-Marti, M-E; Peñarrocha, D; Balaguer-Martinez, J-F; Peñarrocha, M-A

    2011-11-01

    To evaluate the presence within the peri-implant sulcus of Tannerela forsythia (Tf), Porphyromonas gingivales (Pg), Treponema denticola (Td) and Aggregatibacter actinomycetemcomitans (Aa), and relate these bacteria to the peri-implant crevicular fluid volume (PICFV). A prospective and cross-sectional clinical case series study was made. For the measurement of crevicular fluid, use was made of the Periotron® 8000 (Proflow Incorporated. New York, USA), measuring the volume in Periotron units (PU). For the detection of periodontopathogenic bacteria we used the IAI-PadoTest 4.5 (IAI Inc., IAI Institute, Zuchwil, Switzerland) - a system for the detection of Tf, Pg, Td and Aa based on the use of RNA arrays. We included 34 patients (19 females and 15 males) with a mean age of 56.4 years. Of these subjects, 30.8% were smokers and 69.2% non-smokers. Out of a total series of 213 implants, we analyzed the crevicular fluid and microbiota in 90 implants. A total of 16.5% of the implants presented mucositis, while 83.5% were in healthy peri-implant conditions. The microbiological study revealed the presence of Tf in 17.1% of the implants, Pg in 9.3%, Td in 13.6%, in Aa in none of the implants. The mean Periotron reading was 93.4 PU (range 12-198 PU). A statistically significant (p<0.05) relationship was observed between PICFV and the total percentage bacteria (Tf, Pg and Td) - with a strong association between the Td levels and smoking (p<0.01). In the implants with mucositis, the concentration of Pg and Td was greater. In the implants studied, the subgingival peri-implant microbiota was characterized by low levels of Pg, Tf, Td, and none of the patients proved positive for Aa. These bacteria showed a positive correlation to crevicular fluid volume, and a statistically significant relationship was observed between Td and smoking.

  19. Relationship between black-pigmented bacteria and dental pulp infections%产黑色素类杆菌与牙髓感染相关性分析

    Institute of Scientific and Technical Information of China (English)

    马珅; 吕朋君; 李桂红

    2015-01-01

    OBJECTIVE To investigate the species of the black‐pigmented bacteria isolated from the patient with dental pulp infections and explore the relationship between the black‐pigmented bacteria and the clinical symptoms of dental pulp infections so as to provide guidance for clinical treatment of the dental pulp infections .METHODS A total of 102 patients with dental pulp infections who were treated in department of stomatology from Aug 2012 to Dec 2013 were enrolled in the study and divided into the symptomatic group with 95 cases and the asymptomatic group with 7 cases according to the clinical symptoms .The clinical symptoms of all the patients ,including the toothache ,diameter of shadow of root tip ,and pus in fistula and root canal ,were examined and recorded .The an‐aerobic bacteria extracted from the root canal were cultured ,and the black‐pigmented bacteria were identified by u‐sing polymerase‐chain‐reaction .RESULTS The detection rate of the black‐pigmented bacteria was 80 .0% in the symptomatic group ,28 .6% in the asymptomatic group ,and there was significant difference between the two groups (P<0 .05) .Among the 137 strains of black‐pigmented bacteria isolated ,there were 5 (70 .1% ) sugar so‐lution species and 2 (29 .9% ) species of Peptoniphilus asaccharolyticus (P< 0 .05) .The detection rate of the black‐pigmented bacteria was higher in the patients with the clinical symptoms such as toothache ,local swelling , and pus in root canal than in the patients without the clinical symptoms (P<0 .05);the bacterial colony counts of the root canal of the symptomatic group were significantly higher than those of the asymptomatic group .CONCLUSION The clinical symptoms of dental pulp infection is closely associated with the black‐pigmented bacteria ,which is dominated by sugar solution species ,and it is necessary for the hospital to pay attention to the root canal .%目的:分析牙髓感染患者患牙的产黑色素类杆菌种属以

  20. 主动脉弓部手术中单侧大脑灌注血流变化与神经系统并发症关系的分析%Analysis of the relationship between the hemodynamic changes during selective cerebral perfusion and postoperative neurological complications in aortic arch surgery

    Institute of Scientific and Technical Information of China (English)

    阳晟; 任长伟; 许尚栋; 孙立忠

    2012-01-01

    Objective: This study tries to monitor the hemodynamic changes of middle cerebral artery ( MCA) by transcranial Doppler sonography (TCD) in aortic arch surgery. Analysis of relationship between the hemodynamic changes during selective cerebral perfusion (SCP) and postoperative neurological complications. Methods: From September 2010 to January 2011, 23 patients with aortic dissection undergoing aortic arch operation were included in this study. Every patient underwent profound hypothermia (DHCA) and selective cerebral perfusion. Hemodynamic signals of bilateral MCA were monitored via TCD during operation. Data at 6 time-points were selected for analysis. All the patients were divided into four groups by the decline in the proportion of non-perfusion side flow( 30% ) , and all the postoperative neurological complications and early death after surgery were recorded in each group. Results: During the full flow of CPB, blood flow velocity of MCA at left and right side was no differences ( P = 0. 565 ) . During SCP, blood flow velocity of MCA at perfusion side (right side) was similar with blood flow velocity before SCP; and blood flow velocity of MCA at non-perfusion side (left side) was significant decreased compare with blood flow veloci-ly before SCP (P 30% groups (50% ) ,no permanent neurological dysfunction (PND) and early death was observed. Conclusion; SCP in aortic arch operation can meet the blood supply to the brain; During SCP, blood flow velocity of MCA at perfusion side (right side) was similar to the blood flow velocity before SCP; blood flow velocity of MCA at non-perfusion side (left side) was significant decreased compare with blood flow velocity before SCP. Less than 30% drop of blood flow velocity of MCA at non-perfusion side (left side) may be safe for the patients.%目的:通过经颅多普勒超声(TCD)监测主动脉弓部手术中大脑中动脉(MCA)的血流,评估选择性脑灌注(SCP)期间血流变化与术后神经系统

  1. Statistical Analysis and Calculation Model of Flexibility Coefficient of Low- and Medium-Sized Arch Dam

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    Su Huaizhi

    2012-01-01

    Full Text Available The flexibility coefficient is popularly used to implement the macroevaluation of shape, safety, and economy for arch dam. However, the description of flexibility coefficient has not drawn a widely consensus all the time. Based on a large number of relative instance data, the relationship between influencing factor and flexibility coefficient is analyzed by means of partial least-squares regression. The partial least-squares regression equation of flexibility coefficient in certain height range between 30 m and 70 m is established. Regressive precision and equation stability are further investigated. The analytical model of statistical flexibility coefficient is provided. The flexibility coefficient criterion is determined preliminarily to evaluate the shape of low- and medium-sized arch dam. A case study is finally presented to illustrate the potential engineering application. According to the analysis result of partial least-squares regression, it is shown that there is strong relationship between flexibility coefficient and average thickness of dam, thickness-height ratio of crown cantilever, arc height ratio, and dam height, but the effect of rise-span ratio is little relatively. The considered factors in the proposed model are more comprehensive, and the applied scope is clearer than that of the traditional calculation methods. It is more suitable for the analogy analysis in engineering design and the safety evaluation for arch dam.

  2. Dental OCT

    Science.gov (United States)

    Wilder-Smith, Petra; Otis, Linda; Zhang, Jun; Chen, Zhongping

    This chapter describes the applications of OCT for imaging in vivo dental and oral tissue. The oral cavity is a diverse environment that includes oral mucosa, gingival tissues, teeth and their supporting structures. Because OCT can image both hard and soft tissues of the oral cavity at high resolution, it offers the unique capacity to identity dental disease before destructive changes have progressed. OCT images depict clinically important anatomical features such as the location of soft tissue attachments, morphological changes in gingival tissue, tooth decay, enamel thickness and decay, as well as the structural integrity of dental restorations. OCT imaging allows for earlier intervention than is possible with current diagnostic modalities.

  3. Association of Dermatoglyphic Peculiarities with Dental Caries in Preschool Children of Lucknow, India

    Science.gov (United States)

    Saha, Sabyasachi; Jagannath, GV; Singh, Sanjay; Saha, Sonali; Garg, Nishita

    2016-01-01

    ABSTRACT Background: Dermatoglyphics refers to study of the intricate dermal ridge configurations on the skin covering the palmar and plantar surfaces of hand and feet. The basis of considering dermatoglyphic patterns as genetic marker for dental caries is that the epithelium of finger buds as well as enamel has ectodermal origin, and both develop at the same time of intrauterine life. Aim: To assess the relationship between fingerprint patterns and dental caries among preschool children of Lucknow city. Study design: This study was of cross-sectional design. Materials and methods: The study group comprised 512 preschool children 2-6 years of age. The prevalence of caries was recorded using "Dentition status and treatment needs" (WHO basic oral health assessment form, 1997). They were divided into three groups as follows: Group I (dmft score = 0-2), group II (dmft score = 3-4) and group III (dmft score ≥5). The handprints of each child were taken using a stamp pad. The fingertip patterns were analyzed according to the classical method and were classified according to the topological method. The frequency of occurrence of type of dermatoglyphic pattern on fingertip of each digit was noted. Statistics: Chi-square test was used to test the significant difference in proportions. Means were compared using Student’s t-test and analysis of variance (ANOVA) or F-test. Results: Subjects belonging to groups II and III showed maximum occurrence of whorl pattern on all digits. Group I subjects had maximum occurrence of arch pattern. All the variables had statistically significant value, with a degree of divergence of specific dermatoglyphic patterns among all three groups. Conclusion: The dental caries susceptibility of an individual increased with incidence of whorl pattern and it decreased with incidence of arch pattern. How to cite this article: Singh E, Saha S, Jagannath GV, Singh S, Saha S, Garg N. Association of Dermatoglyphic Peculiarities with Dental Caries in

  4. New Insight into the Toughening Mechanisms of Seashell: From Arch Shape to Multilayer Structure

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    Quan Yuan

    2016-01-01

    Full Text Available A seashell is a closed three-dimensional curved surface formed by two symmetrical open shells. Three-point bending is performed on a pure aragonite straight beam (PASB model and a multilayer structure curved beam (MSCB model to elucidate the structure-property relationships of seashells. The integrity of the PASB is broken because of the introduction of a soft layer, but this drawback is compensated by the peculiar arch shape and the internal multilayer structure. The effective modulus, stiffness, and fracture energy of MSCB increase with an increase in volume fraction, aspect ratio of aragonite platelet, overlap ratio of hard layers, and ratio of the elastic modulus of the hard layer to the shear modulus of the soft layer. New design disciplines drawn from the MSCB model are peculiar arch shape, internal multilayer structure of larger volume fraction, and aspect ratio of hard layers and nanoscaled soft layers.

  5. Lymphoepithelial cyst in the palatoglossus arch

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    Evanice Maria Marçal Vieira

    2012-12-01

    Full Text Available The objective of this study was to describe a case of a lymphoepithelial cyst in the palatoglossus arch. A 16-years-old black man said that he was observed a lesion in his mouth. On the physical exam, a pedicled, consistent, smooth surface 1.5 x 1 cm lesion, similar in color to the adjacent mucosa, was found. The lesion was surgically removed and the microscopic exam showed mucosal fragments with pedicled lesion; the cystic cavity sometimes lined with pseudostratified cylindrical epithelium and others with stratified squamous flat interface of the epithelium. Around the cyst, a well-delimited mass of lymphoid tissue, presenting lymphoid follicles, was also seen. Lymphoepithelial cyst has clinical characteristics similar to those of others lesions that occur in the oral cavity. The diagnosis should be based on conservative biopsy, with total removal of lesion.

  6. Accuracy in dental medicine, a new way to measure trueness and precision.

    Science.gov (United States)

    Ender, Andreas; Mehl, Albert

    2014-04-29

    Reference scanners are used in dental medicine to verify a lot of procedures. The main interest is to verify impression methods as they serve as a base for dental restorations. The current limitation of many reference scanners is the lack of accuracy scanning large objects like full dental arches, or the limited possibility to assess detailed tooth surfaces. A new reference scanner, based on focus variation scanning technique, was evaluated with regards to highest local and general accuracy. A specific scanning protocol was tested to scan original tooth surface from dental impressions. Also, different model materials were verified. The results showed a high scanning accuracy of the reference scanner with a mean deviation of 5.3 ± 1.1 µm for trueness and 1.6 ± 0.6 µm for precision in case of full arch scans. Current dental impression methods showed much higher deviations (trueness: 20.4 ± 2.2 µm, precision: 12.5 ± 2.5 µm) than the internal scanning accuracy of the reference scanner. Smaller objects like single tooth surface can be scanned with an even higher accuracy, enabling the system to assess erosive and abrasive tooth surface loss. The reference scanner can be used to measure differences for a lot of dental research fields. The different magnification levels combined with a high local and general accuracy can be used to assess changes of single teeth or restorations up to full arch changes.

  7. Comparison of temporary anchorage devices and transpalatal arch-mediated anchorage reinforcement during canine retraction

    Science.gov (United States)

    Kecik, Defne

    2016-01-01

    Objective: The purpose of this study was to compare the dental and skeletal effects of canine retraction using conventional anchorage reinforcement systems and comparing them with the usage of TADs. Materials and Methods: The sample consisted of 50 patients having Class I malocclusions with bimaxillary protrusion indicated for first premolar extraction, and allocated into two groups. The first group consisted of 25 patients with a mean age of 18,7 years (min:14, max:22 years, 16 girls and 9 boys) that TADs were applied as an anchorage mechanic between attached gingiva of upper second premolar and first molar teeth. The second group consisted of 25 patients with a mean age of 19,4 years (min:15, max:23 years, 14 girls and 11 boys) that conventional molar anchorage with Transpalatal arch (TPA) was applied for the anchorage mechanics against canine retraction. Results: The results showed that mean mesial movement and the tipping of the first molars in TAD group between T0 - T1 were insignificant (P > 0,05), however in the TPA group were significant (P0,05). Conclusion: Although TPA is a useful appliance, it doesn't provide an effective anchorage control on anteroposterior movement maxillary first molar teeth concerning first premolar extraction treatment. TADs are more convenient to provide absolute anchorage during maxillary canine retraction in contrast to transpalatal arch. PMID:28042267

  8. Dental Fusion: Report on a Clinical Case

    OpenAIRE

    Colorado Vélez, Carlos

    2014-01-01

    Fusion is defined as the partial or complete union of two or more teeth during their development; it can occur between normal teeth or between a normal tooth and a supernumerary tooth. This anomaly can be unilateral or bilateral and can affect any teeth, although deciduous teeth are more frequently damaged. It can also affect the patient’s appearance, cause changes in the dental arch space, lead to cavities and affect periodontal structures. This article presents the case of 13-year-old who c...

  9. Occlusal considerations for dental implant restorations.

    Science.gov (United States)

    Bergmann, Ranier H

    2014-01-01

    When placed, dental implants are put into an ever-changing oral environment in which teeth can continue to migrate. Yet, the implants themselves are ankylosed. This can lead to occlusal instability. Teeth may continue to erupt, leaving the implants in infraocclusion. Teeth may move mesially away from an implant, requiring modification to close an open contact point. Friction in the connection between teeth and implants can lead to intrusion of teeth and damage to the periodontal attachment apparatus. Implant occlusion with shallow incisal guidance minimizes lateral and tipping forces. Cross-arch stabilization allows the best distribution of occlusal forces. The choice of restorative materials influences long-term occlusal stability.

  10. Dental Caries (Tooth Decay)

    Science.gov (United States)

    ... Find Data by Topic > Dental Caries (Tooth Decay) Dental Caries (Tooth Decay) Main Content Dental caries (tooth decay) remains the most prevalent chronic ... important source of information on oral health and dental care in the United States since the early ...

  11. Infant dental care (image)

    Science.gov (United States)

    ... sugar water. As the child grows, establishing proper dental hygiene will promote healthy teeth and gums which are essential to overall good health. Poor dental development, dental disease, and dental trauma can result ...

  12. Image Processing Techniques for Assessment of Dental Trays

    Science.gov (United States)

    2007-11-02

    Dimensional Tooth Movement During Orthodontic Treatment�, IEEE Transactions on Biomedical Engineering, Vol. 38, no 4, pp. 360-365, April 1991. [2...in a Complete Dental Arch Cast�, The Journal of Prosthetic Dentistry, Vol 61, no 1, pp. 54-58, January 1989. [3] Saunders, W. P., Sharkey, S. W...Polyvinyl Siloxane Impression Material�, Journal of Dentistry, Vol. 19, no. 5, pp. 283-289, October 1991. [4] Johnson, G.H., Craig, R. G., �Accuracy

  13. Immediate placement of dental implants in the mandible

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    Gurkar Haraswarupa Puttaraju

    2013-01-01

    Full Text Available This case describes extraction of teeth in the mandibular arch, i.e., 41 42 43 44 45 51 52 53 54 55 56 57 58 (grade two mobility, followed by immediate placement of four dental implants (3i biomet, two in the 45 55 region and two dental implants in 12 21 region. A prefabricated provisional mandibular denture was immediately placed. The purpose of immediate placement was to aid the patient resume his professional duties the next day itself along with esthetic and functional comfort, psychological well-being and most importantly preserving the remaining tissue in a healthy condition.

  14. Articulated dental cast analysis of asymptomatic and symptomatic populations

    Science.gov (United States)

    Cordray, Frank E

    2016-01-01

    Dental instrumentation has long provided insight into the mechanism of musculo-skeletal function of the gnathic system. While large population studies associate dental arch displacement (DAD), especially laterally, with symptoms, mandibular condyle displacement (CD) resulting from DAD has not been targeted as possibly etiologic in the production of common muscle contraction headache (CMCH) and temporo-mandibular dysfunction (TMD). The objective was to evaluate the three-dimensional nature of DAD and CD between the seated condylar position (SCP) and the intercuspal position (ICP) and to compare results derived from large deprogrammed asymptomatic and symptomatic populations. A total of 1 192 sets of dental casts collected from asymptomatic and symptomatic populations were articulated in the SCP. The initial occlusal contact, DAD, and condylar displacement were evaluated for frequency, direction, and magnitude of displacement between the SCP and ICP. The data revealed significant displacement between the SCP and ICP of the condyles (displaced most frequently inferior (down) and posterior (distal)) and substantially increased frequency and magnitude of displacement of the dental arches (with posterior premature occlusal contacts, increased overjet, decreased overbite, midline differences, and occlusal classification changes) in symptomatic subjects. These discrepancies were statistically significant and clinically significant. The data support the concept of increased DAD and CD with dysfunction. Transverse condylar displacement, commonly presenting with dental cross bite, may be associated with CMCH and TMD. Displacement of the mandibular condyle may be an etiologic factor in CMCH and dysfunction of the temporo-mandibular joint. PMID:27357324

  15. Oral breathing and dental malocclusions.

    Science.gov (United States)

    Zicari, A M; Albani, F; Ntrekou, P; Rugiano, A; Duse, M; Mattei, A; Marzo, G

    2009-06-01

    Aim of the present study was to evaluate existing correlations between oral breathing and dental malocclusions. The study was conducted on a paediatric group of 71 oral breathers selected at the Allergology and Paediatric Immunology Department of Umberto I General Hospital, University of Rome "La Sapienza" (Italy). The children were selected based on inclusion/exclusion criteria. Children aged 6 to 12 years with no history of craniofacial malformations or orthodontic treatment were included. The results were compared with a control group composed of 71 patient aged 6 to 12 years with nasal breathing. After their medical history was recorded, all patients underwent orthodontic/otolaryngological clinical examinations. The following diagnostic procedures were then performed: latero-lateral projection teleradiography, orthopantomogram, dental impressions, anterior rhinomanometry before and after administering a local vasoconstrictor, nocturnal home pulse oximetry (NHPO) recording, spirometry test, skin prick test, study cast evaluation and cephalometric analysis following Tweed's principles. The intraoral examination assessed: dental class type, overbite, overjet, midlines, crossbite, and presence of parafunctional oral habits such as atypical swallowing, labial incompetence, finger sucking and sucking of the inner lip. Evaluation of the study casts involved arch perimeter and transpalatal width assessment, and space analysis. The results showed a strong correlation between oral breathing and malocclusions, which manifests itself with both dentoskeletal and functional alterations, leading to a dysfunctional malocclusive pattern. According to the authors' results, dysfunctional malocclusive pattern makes it clear that the association between oral breathing and dental malocclusions represents a self-perpetuating vicious circle in which it is difficult to establish if the primary alteration is respiratory or maxillofacial. Regardless, the problem needs to be addressed and

  16. Young adult patient with two palatally maxillary impacted canines and forced traction on rigid arches of stabilization. Case report

    Science.gov (United States)

    MUCEDERO, M.; PEZZUTO, C.; ROZZI, M.; RICCHIUTI, M.R.; COZZA, P.

    2016-01-01

    SUMMARY Objective Young adult patient treated for impaction of two maxillary canines. Methods C.S., 15 years, female. Diagnostic evaluation by clinical and radiographic examinations shows permanent dentition with persistence of 5.3 and 6.3, impaction of 1.3 and 2.3, dento-skeletal Cl I malocclusion, normodivergence of bone bases. Analysis of TC dentalscan confirms the palatal impaction of 1.3 and 2.3. The treatment plan provided an orthodontic-surgical approach for adequate space management in dental arch, evaluation of eruption movements, choice of anchorage device, surgical exposure and application of the brackets. Results Deciduous canines have been extracted and an edgewise appliance with rigid rectangular full thickness archwires has been used to align the arches and to obtain maximum anchorage during the forced traction. The surgical phase, for exposure of 1.3 and 2.3 respectively, performed an open technique by excisional uncovering and a close technique by a repositioned flap. The case has been finalized for the achievement of the right occlusal keys. Conclusion The possibility to choose the surgical technique depending on the intraosseous position of impacted teeth in association to the edgewise therapy with full thickness arches allows to realize an effectiveness surgical-orthodontic approach for the forced traction of impacted teeth in a favourable position. PMID:28042427

  17. The assessment of crowding without the need to record arch perimeter. Part I: Arches with acceptable alignment.

    Science.gov (United States)

    Battagel, J M

    1996-05-01

    A simplified, mathematically determined technique for calculating arch perimeter (the overlap method) is described and its validity in determining an accurate assessment of crowding is tested. Indices, expressed in millimetres of crowding or spacing, were computed for both the whole arch and the labial segment alone. Study casts of 36 individuals with clinically acceptable lower arches were used to validate the method. The degree of crowding or spacing calculated was compared with a "clinical' assessment of each arch, in which the irregularity was measured directly using a steel ruler. Various calculation schemes were tested. Depending on exactly how the overlap was determined, the results varied slightly. Although the arches showed acceptable alignment, it was preferable to include a strategy for normalizing the positions of any rotated teeth before the overlaps were calculated. Repositioning any bucco-lingually displaced teeth into the line of the arch, however, was not useful. For the complete arch good agreement with the clinical assessment was reached on 31 occasions and for the labial segment, all but one appraisals were within 0.5 mm of each other. In the remaining instances (five complete arches and one labial segment), the degree of crowding or spacing was between 0.5 and 1 mm of the clinical assessment. Considering that clinical measurement of minor degrees of crowding and spacing cannot be precise, these results were considered acceptable. The method was easy to use, relying only on the recording of mesio-distal tooth widths and was acceptably reproducible. The technique would therefore appear to provide a valid yet simple research tool with which to record the degree of crowding. Its ability to cope with irregular and crowded arches will be the subject of a subsequent review.

  18. A comparative study of inter-abutment distance of dies made from full arch dual-arch impression trays with those made from full arch stock trays: An in vitro study

    Directory of Open Access Journals (Sweden)

    Reddy Jagan

    2009-01-01

    Full Text Available Objectives: The dual-arch impression technique is convenient in that it makes the required maxillary and mandibular impressions, as well as the inter-occlusal record in one procedure. The accuracy of inter-abutment distance in dies fabricated from dual-arch impression technique remains in question because there is little information available in the literature. Materials and Methods: This study was conducted to evaluate the accuracy of inter-abutment distance in dies obtained from full arch dual-arch trays with those obtained from full arch stock metal trays. Results and Conclusion: The metal dual-arch trays showed better accuracy followed by the plastic dual-arch and stock dentulous trays, respectively, though statistically insignificant. The pouring sequence did not have any effect on the inter-abutment distance statistically, though pouring the non-working side of the dual-arch impression first showed better accuracy.

  19. The relationship between salivary protein's change and dental caries%唾液蛋白变化与患龋风险的相关性分析

    Institute of Scientific and Technical Information of China (English)

    杨柳青; 孙青; 魏辰轩; 王晓丽

    2013-01-01

    PURPOSE: To evaluate the relationship between salivary protein's change and dental caries in patients after oral administration of glucocorticoid. METHODS: Sixty patients were divided equally into the experimental group and the control group. The mixed saliva samples of the experimental group before (T1) and after (T2) taking GC orally, as well as the baseline (C1) and after 12 months (C2) of the control group were collected. IgA, LDH, LZM were examined in both groups. The decayed-missing-filled surface (DMFS), decayed-missing-filled tooth (DMFT), caries severity index (CSI) in both groups were recorded. All statistical analyses were performed using SPSS17.0 software package. RESULTS: After taking GC orally, the concentration of IgA and LZM were significantly lower than the control group (P<0.01), while the concentration of LDH was significantly higher than the control group (P<0.01). Before and after taking GC orally, the salivary protein's change was significantly correlated with DMFT.DMFS and CSI. CONCLUSIONS: After taking glucocorticoid orally , the concentration of LZM, IgA, LDH in saliva changes. LZM, IgA, LDH take part in the occurrence and development of dental caries as the important part of oral immunization. Supported by Research Fund of Science and Technology Commission of Shanghai Municipality(081411967000).%目的:分析服用糖皮质激素(GC)后唾液蛋白含量变化对龋齿的影响.方法:设试验组和对照组各30例,收集试验组服用GC前(T1)和服用后(T2)及正常对照组首次(C1)和12个月后(C2)混合唾液样本,检测其中溶菌酶(LZM)、免疫球蛋白A(IgA)、乳酸脱氢酶(LDH)的含量;检查2组患龋情况并计算龋失补牙面数、龋失补牙数、龋蚀指数.采用SPSS17.0软件包对结果数据进行统计学分析.结果:服用GC后,LZM、IgA含量显著低于正常组(P<O.01),LDH含量显著高于正常组(P<0.01).服用GC前后,唾液蛋白的变化与龋失补牙面数、龋失补牙数、龋蚀指

  20. Determination of metal ions released by stainless steel arch bar into bio-fluids

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    Lori A. Joseph

    2009-04-01

    Full Text Available The amounts of cobalt, iron, manganese, nickel and chromium ions released from new and reused stainless steel arch bar used for maxillomandibular fixation was determined in Hank’s solutions of different hydrogen and chloride ions concentrations, whole blood serum and phosphate buffered saline (PBS in vitro, over a six-week immersion time at 37 oC, by atomic absorption spectrophotometry. The corrosion levels of the wires due to effects of media and incubation times in the bio-fluids were compared by Duncan’s two-way ANOVA (P less than 0.05. Pearson’s correlation was used in establishing relationship in the amounts of metal ions released by new and reused arch bars. The study indicated that the reused wires released more ions than new ones at all time points. The variation of pH and chloride ions of the bio-fluids had a significant effect on the amount of Ni, Mn and Cr ions released. Ageing prior use of arch bars significantly increased Ni ions released into the bio-fluids.

  1. Relationship between Untreated Dental Caries and Weight and Height of 6- to 12-Year-Old Primary School Children in Bangladesh

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    Masuma Pervin Mishu

    2013-01-01

    Full Text Available Background. Children in low-income developing countries are likely to suffer from undergrowth. Dental caries is another common problem in these countries. Aim. To examine the association between untreated dental caries in primary and permanent teeth with age-adjusted height and weight among 6–12-year-old children in Bangladesh. Design. Social, behavioural, and clinical data were collected from 1699 children in nine different randomly selected primary schools in socially deprived areas of Bangladesh. The associations of age-adjusted weight and height and being underweight with dental caries were examined adjusting for sex, area of residence, socioeconomic position, skipping meals, tooth cleaning, and doctor visits. Results. 26% of the children were underweight and 55% had untreated dental caries. Children with at least one decayed tooth were significantly underweight with odds ratios 1.6 (95% CI 1.1, 2.3 and 1.5 (95% CI 1.1, 2.0 for 6–8-years and 9–12-year-old children, respectively, in the adjusted model. The number of decayed teeth was inversely and significantly associated with the standardized age-adjusted weight. Conclusions. The findings highlight the association between untreated dental caries and being underweight in primary school children in socially deprived areas in low-income developing countries and emphasize the need to integrate oral and general health policies with social policies.

  2. The correlation study on arch type with physical fitness, body fat and heath-carter somatotype

    Institute of Scientific and Technical Information of China (English)

    Wang Lei; Yin Shuai; Sui Yuelin; Liu Yuanyuan; Ding Wenfeng

    2015-01-01

    Objective: To explore the relationship between the arch type and physical form, physical fit-ness, body fat and somatotype. Methods:Measure and type the arch of 382 male soldier in a certain army by foot-print ratio method; Routinely detect the results of height and weight, body fat, 100 and 5 000 meters running, standing jump;According to the international heath-carter method, ten indexes were measured and the somatotype were evaluated. Results:①382 samples, flatfoot 91, accounted for 23. 6%, the foot arch index 0. 60 + 0. 21;non-flatfoot 291 , 76 . 2%, arch index 1 . 14 +0 . 22 , t=22 . 83 , P=0 . 001;②Comparing the mean of the results of height, weight, BMI, body fat percentage,100 and 5 000 meters running, standing jump of the two groups( flatfoot and non-flatfoot) samples, t-text, P>0. 05; ③Assessed by the method of heath-carter shape, flatfoot group so-matotype mean is 2. 7 (0. 7) -4. 8 (1. 3) -2. 7 (0. 9), sam is 1. 5 (0. 9);non flatfoot group somatotype mean is 2. 3 (0. 7) -5. 0 (3. 1) -2. 4 (0. 9), sam is 1. 6 (1. 0);The distance of two groups`points in 3D space mean somatotypes is 0. 54; t-test of the two groups`somatotype mean, P>0. 05. Conclusions: Compared the flatfoot group with the control group, there is no significant difference in physical form, physical fitness, body fat and so-matotype. The increasingly high rate of flatfoot in healthy people is physical, but not flatfoot disease, and no need for surgery.

  3. Nonstationary ARCH and GARCH with t-distributed Innovations

    DEFF Research Database (Denmark)

    Pedersen, Rasmus Søndergaard; Rahbek, Anders

    Consistency and asymptotic normality are established for the maximum likelihood estimators in the nonstationary ARCH and GARCH models with general t-distributed innovations. The results hold for joint estimation of (G)ARCH effects and the degrees of freedom parameter parametrizing the t-distribut......Consistency and asymptotic normality are established for the maximum likelihood estimators in the nonstationary ARCH and GARCH models with general t-distributed innovations. The results hold for joint estimation of (G)ARCH effects and the degrees of freedom parameter parametrizing the t......-distribution. With T denoting sample size, classic square-root T-convergence is shown to hold with closed form expressions for the multivariate covariances....

  4. A case of neonatal arterial thrombosis mimicking interrupted aortic arch.

    Science.gov (United States)

    Gürsu, Hazım Alper; Varan, Birgül; Oktay, Ayla; Özkan, Murat

    2015-06-01

    Neonatal arterial thrombosis is a very rare entity with clinical findings resembling coarctation of aorta or interrupted aortic arch. A two day-old male newborn was admitted to a different hospital with difficulty in sucking and sleepiness. On echocardiographic examination, a diagnosis of interrupted aortic arch was made and he was treated with prostoglandin E2. When the patient presented to our center, physical examination revealed that his feet were bilaterally cold. The pulses were not palpable and there were ecchymotic regions in the lower extremities. Echocardiography ruled out interrupted aortic arch. Computerized tomographic angiography revealed a large thrombosis and total occlusion of the abdominal aorta. Since there was no response to treatment with tissue plasminogen activator, we performed thrombectomy. Homozygous Factor V Leiden and Methylenetetrahydrofolate reductase mutations were found in this patient. Neonatal aortic thrombosis which is observed very rarely and fatal should be considered in the differential diagnosis of coarctation of aorta and interrupted aortic arch.

  5. The relationship between levels of income inequality and dental caries and periodontal diseases A associação dos níveis de desigualdade de renda com cárie dental e doença periodontal

    Directory of Open Access Journals (Sweden)

    Roger Keller Celeste

    2011-06-01

    Full Text Available The objective of this study was to evaluate the association between income inequality at a lagged time of 2 and 11 years with two short latency outcomes (untreated dental caries and gingivitis and two long latency outcomes (edentulism and periodontal attachment loss > 8mm. We used data from the Brazilian oral health survey in 2002-2003. Our analysis included 13,405 subjects aged 35-44 years. Different lagged Gini at municipal level were fitted using logistic and negative binomial multilevel analyses. Covariates included municipal per capita income, equivalized income, age, sex, time since last dental visit and place of residence (rural versus urban. Crude estimates showed that only untreated dental caries was associated with current and lagged Gini, but in adjusted models only current Gini remained significant with a ratio of 1.19 (95%CI: 1.09-1.30 for every ten-point increase in the Gini coefficient. We conclude that lagged Gini showed no association with oral health; and current income Gini was associated with current dental caries but not with periodontal disease.Avaliar a associação entre desigualdade de renda (Gini municipal defasada em 2 e 11 anos com dois desfechos de curta latência (cárie dentária não tratada e gengivite e dois de longa latência (edentulismo e perda de inserção periodontal > 8mm. Foram utilizados dados do inquérito brasileiro de saúde bucal em 2002-2003. A análise incluiu 13.405 indivíduos com idades entre 35-44 anos. Foram usados modelos de regressão multinível. Covariáveis incluídas: renda municipal per capita, renda domiciliar equivalente, idade, sexo, tempo decorrido desde a última consulta odontológica e local de residência (rural versus urbano. Estimativas brutas mostraram que apenas cárie dental não tratada estava associada ao Gini (atual e defasado no tempo, mas em modelos ajustados apenas Gini atual manteve uma relação significativa com razão de 1,19 (IC95%: 1,09-1,30 para cada dez

  6. Dental insurance! Are we ready?

    Directory of Open Access Journals (Sweden)

    Ravi SS Toor

    2011-01-01

    Full Text Available Dental insurance is insurance designed to pay the costs associated with dental care. The Foreign Direct Investment (FDI bill which was put forward in the winter session of the Lok Sabha (2008 focused on increasing the foreign investment share from the existing 26% to 49% in the insurance companies of India. This will allow the multibillion dollar international insurance companies to enter the Indian market and subsequently cover all aspects of insurance in India. Dental insurance will be an integral a part of this system. Dental insurance is a new concept in Southeast Asia as very few countries in Southeast Asia cover this aspect of insurance. It is important that the dentists in India should be acquainted with the different types of plans these companies are going to offer and about a new relationship which is going to emerge in the coming years between dentist, patient and the insurance company.

  7. Dental insurance! Are we ready?

    Science.gov (United States)

    Toor, Ravi S S; Jindal, R

    2011-01-01

    Dental insurance is insurance designed to pay the costs associated with dental care. The Foreign Direct Investment (FDI) bill which was put forward in the winter session of the Lok Sabha (2008) focused on increasing the foreign investment share from the existing 26% to 49% in the insurance companies of India. This will allow the multibillion dollar international insurance companies to enter the Indian market and subsequently cover all aspects of insurance in India. Dental insurance will be an integral a part of this system. Dental insurance is a new concept in Southeast Asia as very few countries in Southeast Asia cover this aspect of insurance. It is important that the dentists in India should be acquainted with the different types of plans these companies are going to offer and about a new relationship which is going to emerge in the coming years between dentist, patient and the insurance company.

  8. Clarifying the anatomy of the fifth arch artery

    Directory of Open Access Journals (Sweden)

    Saurabh Kumar Gupta

    2016-01-01

    Full Text Available The artery allegedly forming in the fifth pharyngeal arch has increasingly been implicated as responsible for various vascular malformations in patients with congenitally malformed hearts. Observations from studies on developing embryos, however, have failed to provide support to substantiate several of these inferences such that the very existence of the fifth arch artery remains debatable. To the best of our knowledge, in only a solitary human embryo has a vascular channel been found that truly resembled the artery of the fifth arch. Despite the meager evidence to support its existence, the fifth arch artery has been invoked to explain the morphogenesis of double-barreled aorta, some unusual forms of aortopulmonary communications, and abnormalities of the brachiocephalic arteries. In most of these instances, the interpretations have proved fallible when examined in the light of existing knowledge of cardiac development. In our opinion, there are more plausible alternative explanations for the majority of these descriptions. Double-barreled aorta is more likely to result from retention of the recently identified dorsal collateral channels while abnormalities of brachiocephalic arteries are better explained on the basis of extensive remodeling of aortic arches during fetal development. Some examples of aortopulmonary communications, nonetheless, may well represent persistence of the developing artery of the fifth pharyngeal arch. We here present one such case - a patient with tetralogy of Fallot and pulmonary atresia, in whom the fifth arch artery provided a necessary communication between the ascending aorta and the pulmonary arteries. In this light, we discuss the features we consider to be essential before attaching the tag of "fifth arch artery" to a candidate vascular channel.

  9. Dental caries

    DEFF Research Database (Denmark)

    Pitts, Nigel B; Zero, Domenick T; Marsh, Phil D

    2017-01-01

    , exposed root surfaces. The balance between pathological and protective factors influences the initiation and progression of caries. This interplay between factors underpins the classification of individuals and groups into caries risk categories, allowing an increasingly tailored approach to care. Dental......Dental caries is a biofilm-mediated, sugar-driven, multifactorial, dynamic disease that results in the phasic demineralization and remineralization of dental hard tissues. Caries can occur throughout life, both in primary and permanent dentitions, and can damage the tooth crown and, in later life...... caries is an unevenly distributed, preventable disease with considerable economic and quality-of-life burdens. The daily use of fluoride toothpaste is seen as the main reason for the overall decline of caries worldwide over recent decades. This Primer aims to provide a global overview of caries...

  10. Expect the Best for Your Child's Dental Home

    Science.gov (United States)

    Casamassimo, Paul

    2007-01-01

    Too many parents of children with special healthcare needs come upon dental care for their child out of necessity or urgency. In order to make the relationship most beneficial, the preferred way is to establish a Dental Home during the child's infancy. The Dental Home is the oral health corollary of the Medical Home concept that the American…

  11. Unusual Morphology of the Anterior Arch of Atlas

    Directory of Open Access Journals (Sweden)

    Srinivasa Rao Sirasanagndla

    2016-10-01

    Full Text Available Anomalies of anterior arch of atlas vertebra are seldom reported in the literature. Presence of inferior accessory ossicle is one of the reported anomalies of the anterior arch of atlas. In the present case, we report a rare case of unusual morphology of the atlas vertebra. It was observed in one of the bones macerated locally for the teaching purpose. There were two wide accessory bony laminae extending from the middle three fourth of the superior and inferior aspect of the anterior arch proper. Each bony lamina was measured 4 cm x 0.3 mm. Further, there were small foramina along the attached border of the each bony lamina. Anterior tubercle was situated at the lower edge of the anterior arch proper. Accessory bony lamina may interfere with rotatory movements of the atlas and may lead to degenerative changes of the dense. Reporting of unusual morphology of anterior arch of atlas vertebra is clinically important during diagnostic procedures of neck pain. Sometimes this extra growth of the anterior arch may be mistaken for the pathologic mass.

  12. Monitoring system of arch bridge for safety network management

    Science.gov (United States)

    Joo, Bong Chul; Yoo, Young Jun; Lee, Chin Hyung; Park, Ki Tae; Hwang, Yoon Koog

    2010-03-01

    Korea has constructed the safety management network monitoring test systems for the civil infrastructure since 2006 which includes airport structure, irrigation structure, railroad structure, road structure, and underground structure. Bridges among the road structure include the various superstructure types which are Steel box girder bridge, suspension bridge, PSC-box-girder bridge, and arch bridge. This paper shows the process of constructing the real-time monitoring system for the arch bridge and the measured result by the system. The arch type among various superstructure types has not only the structural efficiency but the visual beauty, because the arch type superstructure makes full use of the feature of curve. The main measuring points of arch bridges composited by curved members make a difference to compare with the system of girder bridges composited by straight members. This paper also shows the method to construct the monitoring system that considers the characteristic of the arch bridge. The system now includes strain gauges and thermometers, and it will include various sensor types such as CCTV, accelerometers and so on additionally. For the long term and accuracy monitoring, the latest optical sensors and equipments are applied to the system.

  13. Using genetics to test the causal relationship of total adiposity and periodontitis: Mendelian randomization analyses in the Gene-Lifestyle Interactions and Dental Endpoints (GLIDE) Consortium

    Science.gov (United States)

    Shungin, Dmitry; Cornelis, Marilyn C; Divaris, Kimon; Holtfreter, Birte; Shaffer, John R; Yu, Yau-Hua; Barros, Silvana P; Beck, James D; Biffar, Reiner; Boerwinkle, Eric A; Crout, Richard J.; Ganna, Andrea; Hallmans, Goran; Hindy, George; Hu, Frank B; Kraft, Peter; McNeil, Daniel W; Melander, Olle; Moss, Kevin L; North, Kari E; Orho-Melander, Marju; Pedersen, Nancy L; Ridker, Paul M; Rimm, Eric B; Rose, Lynda M; Rukh, Gull; Teumer, Alexander; Weyant, Robert J; Chasman, Daniel I; Joshipura, Kaumudi; Kocher, Thomas; Magnusson, Patrik KE; Marazita, Mary L; Nilsson, Peter; Offenbacher, Steve; Davey Smith, George; Lundberg, Pernilla; Palmer, Tom M; Timpson, Nicholas J; Johansson, Ingegerd; Franks, Paul W

    2015-01-01

    Background: The observational relationship between obesity and periodontitis is widely known, yet causal evidence is lacking. Our objective was to investigate causal associations between periodontitis and body mass index (BMI). Methods: We performed Mendelian randomization analyses with BMI-associated loci combined in a genetic risk score (GRS) as the instrument for BMI. All analyses were conducted within the Gene-Lifestyle Interactions and Dental Endpoints (GLIDE) Consortium in 13 studies from Europe and the USA, including 49 066 participants with clinically assessed (seven studies, 42.1% of participants) and self-reported (six studies, 57.9% of participants) periodontitis and genotype data (17 672/31 394 with/without periodontitis); 68 761 participants with BMI and genotype data; and 57 871 participants (18 881/38 990 with/without periodontitis) with data on BMI and periodontitis. Results: In the observational meta-analysis of all participants, the pooled crude observational odds ratio (OR) for periodontitis was 1.13 [95% confidence interval (CI): 1.03, 1.24] per standard deviation increase of BMI. Controlling for potential confounders attenuated this estimate (OR = 1.08; 95% CI:1.03, 1.12). For clinically assessed periodontitis, corresponding ORs were 1.25 (95% CI: 1.10, 1.42) and 1.13 (95% CI: 1.10, 1.17), respectively. In the genetic association meta-analysis, the OR for periodontitis was 1.01 (95% CI: 0.99, 1.03) per GRS unit (per one effect allele) in all participants and 1.00 (95% CI: 0.97, 1.03) in participants with clinically assessed periodontitis. The instrumental variable meta-analysis of all participants yielded an OR of 1.05 (95% CI: 0.80, 1.38) per BMI standard deviation, and 0.90 (95% CI: 0.56, 1.46) in participants with clinical data. Conclusions: Our study does not support total adiposity as a causal risk factor for periodontitis, as the point estimate is very close to the null in the causal inference analysis, with wide

  14. Using genetics to test the causal relationship of total adiposity and periodontitis: Mendelian randomization analyses in the Gene-Lifestyle Interactions and Dental Endpoints (GLIDE) Consortium.

    Science.gov (United States)

    Shungin, Dmitry; Cornelis, Marilyn C; Divaris, Kimon; Holtfreter, Birte; Shaffer, John R; Yu, Yau-Hua; Barros, Silvana P; Beck, James D; Biffar, Reiner; Boerwinkle, Eric A; Crout, Richard J; Ganna, Andrea; Hallmans, Goran; Hindy, George; Hu, Frank B; Kraft, Peter; McNeil, Daniel W; Melander, Olle; Moss, Kevin L; North, Kari E; Orho-Melander, Marju; Pedersen, Nancy L; Ridker, Paul M; Rimm, Eric B; Rose, Lynda M; Rukh, Gull; Teumer, Alexander; Weyant, Robert J; Chasman, Daniel I; Joshipura, Kaumudi; Kocher, Thomas; Magnusson, Patrik K E; Marazita, Mary L; Nilsson, Peter; Offenbacher, Steve; Davey Smith, George; Lundberg, Pernilla; Palmer, Tom M; Timpson, Nicholas J; Johansson, Ingegerd; Franks, Paul W

    2015-04-01

    The observational relationship between obesity and periodontitis is widely known, yet causal evidence is lacking. Our objective was to investigate causal associations between periodontitis and body mass index (BMI). We performed Mendelian randomization analyses with BMI-associated loci combined in a genetic risk score (GRS) as the instrument for BMI. All analyses were conducted within the Gene-Lifestyle Interactions and Dental Endpoints (GLIDE) Consortium in 13 studies from Europe and the USA, including 49,066 participants with clinically assessed (seven studies, 42.1% of participants) and self-reported (six studies, 57.9% of participants) periodontitis and genotype data (17,672/31,394 with/without periodontitis); 68,761 participants with BMI and genotype data; and 57,871 participants (18,881/38,990 with/without periodontitis) with data on BMI and periodontitis. In the observational meta-analysis of all participants, the pooled crude observational odds ratio (OR) for periodontitis was 1.13 [95% confidence interval (CI): 1.03, 1.24] per standard deviation increase of BMI. Controlling for potential confounders attenuated this estimate (OR = 1.08; 95% CI:1.03, 1.12). For clinically assessed periodontitis, corresponding ORs were 1.25 (95% CI: 1.10, 1.42) and 1.13 (95% CI: 1.10, 1.17), respectively. In the genetic association meta-analysis, the OR for periodontitis was 1.01 (95% CI: 0.99, 1.03) per GRS unit (per one effect allele) in all participants and 1.00 (95% CI: 0.97, 1.03) in participants with clinically assessed periodontitis. The instrumental variable meta-analysis of all participants yielded an OR of 1.05 (95% CI: 0.80, 1.38) per BMI standard deviation, and 0.90 (95% CI: 0.56, 1.46) in participants with clinical data. Our study does not support total adiposity as a causal risk factor for periodontitis, as the point estimate is very close to the null in the causal inference analysis, with wide confidence intervals. © The Author 2015; all rights reserved

  15. [Dissertations 25 years after the date 36. Dental development and facial growth during adolescence].

    Science.gov (United States)

    Schols, J G J H

    2013-11-01

    Dental development does not end with the shedding of the deciduous dentition. Partly as a result of the continuing facial growth up to adulthood, adaptations in the position of the teeth and the occlusion occur after the second phase of eruption. The dissertation Gebissentwicklung und Gesichtswachstum in der Adoleszenz, from 1988, was concerned with research into tooth development, facial growth and their interrelationship during the first decade after the second phase of tooth eruption. Changes in the dental arches go together with changes in the occlusion. These physiological changes in the dentition can largely be attributed to the shift of the mandibular dental arch to a more ventral position, with respect to the maxillary dental arch. Facial growth and changes in the morphology of the craniofacial skeleton up to adulthood are especially a result of adaptations which take place under the floor of the nose and as a result of the enlargement of the mandible. Later research in patients up to the age of approximately 40 years, revealed that these dental and skeletal changes continued to occur.

  16. In vitro study of dose-response relationship of fluoride with dental enamel = Estudo in vitro da relação dose-resposta do fluoreto com esmalte dental

    Directory of Open Access Journals (Sweden)

    Arthur, Rodrigo Alex

    2007-01-01

    Full Text Available Modelos in vitro para avaliação da reatividade do fluoreto (F devem apresentar resposta dose-efeito. Dessa forma, o objetivo desse estudo foi avaliar a relação dose-resposta do fluoreto presente em solução aquosa com o esmalte dental bovino. Cento e vinte blocos de esmalte bovino (5 × 5 × 2 mm, 60 hígidos e 60 com lesão artificial de cárie, foram submetidos durante 10 minutos à água destilada e deionizada (controle negativo e soluções aquosas contendo 50, 100, 200 ou 400 µg F/mL. Cada grupo experimental recebeu 12 blocos hígidos e 12 blocos com lesão artificial de cárie. Duas camadas consecutivas de esmalte dental foram removidas de todos os blocos dentais por meio de ataque ácido e o fluoreto extraído foi determinado com eletrodo específico. Os resultados de fluoreto incorporado foram expressos em µg por g de esmalte removido, considerando a quantidade total das duas camadas. A incorporação de fluoreto pelo esmalte hígido mostrou uma relação dose-resposta linear (p = 0,0001, enquanto que os blocos com lesão de cárie mostraram relação polinomial quadrática (p < 0,0001. Os resultados sugerem que o modelo in vitro de reatividade empregado no presente estudo é apropriado para avaliar a relação doseresposta entre o fluoreto em solução aquosa e aquele incorporado pelo esmalte dental bovino hígido ou com lesão artificial de cárie

  17. Estimation of Dental and Facial Proportions Using Height as Criteria

    OpenAIRE

    Nalawade, Sumit Shivaji; Shinde, Sagar Kundlik; Pawar, Renuka Lalit; Gupta, Aditi; Kale, Vishwajeet Tulshidas; Janrao, Kunal Ashok

    2014-01-01

    Background: Ideal dental restoration is one which not only restores optimal functions but also confirm to standard dental and facial relations. This is important to achieve long term patient satisfaction both with regard to esthetics as well as functions. Objective was to find a credible relationship between dental and facial proportions using height of individuals as the criteria in a specific group of population. To determine a regression equation for determination of various dental and fac...

  18. Relação entre níveis de fluoreto na água de abastecimento público e fluorose dental Relationship between fluoride levels in the public water supply and dental fluorosis

    Directory of Open Access Journals (Sweden)

    Danilo Bonadia Catani

    2007-10-01

    Full Text Available OBJETIVO: Avaliar a prevalência da fluorose dentária em escolares sujeitos a diferentes concentrações de fluoreto na água de abastecimento público das suas cidades. MÉTODOS: A amostra foi composta de 386 escolares de sete anos de idade, moradores de dois municípios do estado de São Paulo que realizaram heterocontrole da fluoretação da água de 1998 a 2002, um deles apresentando concentração homogênea de fluoreto e o outro oscilante. Fluorose dental foi determinada examinando os incisivos superiores permanentes (secos pelo índice de Dean, o grau de fluorose classificado como questionável foi considerado como fluorose. Variáveis sociodemográficas e questões sobre saúde bucal foram avaliadas com questionário estruturado enviado aos pais/responsáveis. Associações foram verificadas por meio de regressão logística múltipla (pOBJECTIVE: To assess the prevalence of dental fluorosis among schoolchildren subjected to different fluoride concentrations in the public water supply of their cities. METHODS: The sample comprised 386 seven-year-old schoolchildren living in two municipalities in the State of São Paulo that practiced external control over the fluoridation of the water from 1998 to 2002: one with homogenous fluoride concentration and the other with oscillating concentration. Dental fluorosis was determined by dry examination of the upper permanent incisors using Dean's index. Scores classified as questionable were considered to represent fluorosis. Sociodemographic variables and questions regarding oral health were assessed using a structured questionnaire sent to the children's parents or the adults responsible for these children. Correlates of fluorosis were assessed using multivariate logistic regression (p<0.05. RESULTS: Both municipalities presented a mild degree of fluorosis. The prevalence of fluorosis in the municipality with oscillating fluoride content in the water was 31.4%, and it was 79.9% in the

  19. Are there differences in oral health and oral health behavior between individuals with high and low dental fear?

    NARCIS (Netherlands)

    Schuller, Annemarie A; Willumsen, Tiril; Holst, Dorthe

    2003-01-01

    Epidemiological studies of the relationship between dental fear, use of dental services, and oral health in different age groups in a common population are scarce. Dental fear and its relationships are usually described in individuals with high dental fear only. The purposes of this study were to de

  20. Are there differences in oral health and oral health behavior between individuals with high and low dental fear?

    NARCIS (Netherlands)

    Schuller, A.A.; Willumsen, T.; Holst, D.

    2003-01-01

    Epidemiological studies of the relationship between dental fear, use of dental services, and oral health in different age groups in a common population are scarce. Dental fear and its relationships are usually described in individuals with high dental fear only. The purposes of this study were to

  1. Digital Mandibular Arch Restoration at an Increased Occlusal Vertical Dimension in One Visit.

    Science.gov (United States)

    Hartrick, Nancy E; Acker, Steven R

    2017-01-01

    This case demonstrates how a fully digital technique was used to restore the mandibular arch to proper function and improved esthetics. The initial treatment plan to restore implants replacing the lower right molars had to be altered due to space limitations. A direct deprogrammer was utilized to determine the proper jaw relationship at an acceptable occlusal vertical dimension. A computer-aided design system was employed to digitally create and fabricate implant/abutment-supported cement-retained lithium-disilicate crowns, toothsupported lithium-disilicate crowns, and screw-retained hybrid abutment lithium-disilicate crowns in one visit.

  2. An interocclusal recording method for the fabrication of full-arch implant-retained restorations.

    Science.gov (United States)

    Zafiropoulos, Gregory-George; Galil, Aiman Abdel; Deli, Giorgio

    2014-07-01

    The prosthetic rehabilitation of full arches with implants requires exact impression and bite registration. In this report, we describe the application of a simple method that uses a duplicate of the full denture as a mounting guide, which allows the accurate recording of the maxillomandibular relationship and bite registration while expediting this process for the treating dentist. Case reports of 2 patient are used to illustrate this method, which is independent of the implant system used, can be applied for both fixed and removable restorations, and reduces chair time.

  3. Geomorphic evidence for recent uplift of the Fitzcarrald Arch (Peru): A response to the Nazca Ridge subduction

    Science.gov (United States)

    Regard, V.; Lagnous, R.; Espurt, N.; Darrozes, J.; Baby, P.; Roddaz, M.; Calderon, Y.; Hermoza, W.

    2009-06-01

    The 400 000 km 2-wide Fitzcarrald Arch constitutes a wide topographic high of the Amazon Basin against the central Andes. In order to constrain its formation mechanisms and in particular to test its relationships to the Nazca ridge subduction, a quantitative geomorphology analysis of the Arch is performed using hypsometric integrals, elongation and azimuths of 7th- and 5th-order catchments. They all express a trend from high maturity to low maturity from NW towards SE. This maturity gradient coupled with the local drainage direction demonstrate that the Fitzcarrald Arch is not a 'classical' alluvial fan, since its apex is located 100 km east to the Subandean Thrust Front and the corresponding sedimentary pile is lacking. Nor is the Arch the superficial expression of an inherited transfer zone, because its geomorphic shape is radial and it does not diverge from a symmetry axis; moreover, such a reactivated structure is not found at depth on seismic profiles. In addition, our data show that underlying geomorphic control on catchment initiation and development has progressed from NW to SE, which in combination with the observation of crustal doming by Espurt et al. [Espurt, N., Baby, P., Brusset, S., Roddaz, M., Hermoza, W., Regard, V., Antoine, P.O., Salas-Gismondi, R., Bolaños, R., 2007. How does the Nazca Ridge subduction influence the modern Amazonian foreland basin? Geology 35, 515-518.] suggests that this relief is caused by the eastward sliding of the buoyant Nazca ridge beneath the South American lithosphere.

  4. Curriculum Guidelines for Pathology for Dental Hygienists.

    Science.gov (United States)

    Journal of Dental Education, 1987

    1987-01-01

    Guidelines for structuring a pathology curriculum for dental hygienists include: definition of the field and its subfields; relationships with other fields; primary educational goals, prerequisites, core content, specific behavioral objectives; and suggestions for sequencing, faculty, facilities, and occupational safety. (MSE)

  5. Dental Training Films.

    Science.gov (United States)

    Veterans Administration Medical Center, Washington, DC.

    This dental training films catalog is organized into two sections. Section I is a category listing of the films by number and title, indexed according to generalized headings; categories are as follow: anatomy, articulator systems, complete dentures, dental assisting, dental laboratory technology, dental materials, dental office emergencies,…

  6. Elastic responses of underground circular arches considering dynamic soil-structure interaction: A theoretical analysis

    Science.gov (United States)

    Chen, Hai-Long; Jin, Feng-Nian; Fan, Hua-Lin

    2013-02-01

    Due to the wide applications of arches in underground protective structures, dynamic analysis of circular arches including soil-structure interactions is important. In this paper, an exact solution of the forced vibration of circular arches subjected to subsurface denotation forces is obtained. The dynamic soil-structure interaction is considered with the introduction of an interfacial damping between the structure element and the surrounding soil into the equation of motion. By neglecting the influences of shear, rotary inertia and tangential forces and assuming the arch incompressible, the equations of motion of the buried arches were set up. Analytical solutions of the dynamic responses of the protective arches were deduced by means of modal superposition. Arches with different opening angles, acoustic impedances and rise-span ratios were analyzed to discuss their influences on an arch. The theoretical analysis suggests blast loads for elastic designs and predicts the potential failure modes for buried protective arches.

  7. 牙周病学和种植义齿的密切关系%The close relationship between periodontology and dental implant

    Institute of Scientific and Technical Information of China (English)

    毛尔加

    2013-01-01

    Dental implant has been scientifically documented and clinically used for more than fifty years. Treat-ment plans and surgical procedures of dental implants have been closely related to periodontology. A comprehensive periodontal exam is a critical part in a diagnosis and treatment plan. Multidisciplinary approaches for implant treatment plans will achieve optimal clinical results and have begun to increase in use. Classic periodontal con-cepts, such as biological width and attached gingival, also apply to the bone and soft tissue around dental im-plants. Similar to periodontal maintenance, the long-term success of dental implants depends on regular mainte-nance programs. Therefore, periodontology is the base of dental implant treatment plans and surgical procedures. Understanding of periodontology is important for everyone involved in dental implant treatments.%  种植义齿已被50多年的临床和科研报道证实具有其科学性和实用性。种植义齿的治疗计划和手术设计与牙周病学有非常密切的关系。首先应对全身和口腔进行全面系统检查和诊断。在术前一定要对其他牙的预后、咬合关系、有无牙周病变等有全面了解。否则种植是很盲目的行为。多学科结合的模式是能综合各学科的精华,从而获得最好的治疗计划和结果。牙周病学的经典概念(牙齿生物学宽度和附着龈)对种植手术具有直接的指导作用。与牙周病系统治疗相似,种植义齿的长期跟踪和随访非常重要,是种植义齿的整个治疗计划的一部分。因此牙周病学是种植义齿的基础,与治疗计划、手术方案和长期成败有关。了解并掌握牙周病学的知识应是每个口腔种植医师所必备的条件。

  8. The gothic arch tracing and the upper canine teeth as guides in the positioning of upper posterior teeth.

    Science.gov (United States)

    el-Gheriani, A S; Davies, A L; Winstanley, R B

    1989-09-01

    The relationship between the position of the buccal cusps of the natural upper posterior teeth and the distance between the lateral arms of the Gothic arch tracing or the distance between the upper canine teeth has been found to be constant to within +/- 2 mm. This may be of value when setting up artificial teeth for denture patients, enabling them to be positioned close to the natural predecessors.

  9. Characterization of the cephalic arch and location of stenosis

    Science.gov (United States)

    Bennett, Shelby; Hammes, Mary S.; Blicharski, Tom; Watson, Sydeaka; Funaki, Brian

    2015-01-01

    Purpose The purpose of this study is to accurately characterize the cephalic arch segments into four domains and to enable more specific evaluation of cephalic arch stenosis (CAS) and determine the frequency of stenosis in each domain. Methods After Institutional Review Board (IRB) approval, a retrospective chart review was done to define a population of patients receiving hemodialysis who developed CAS as apparent on clinically indicated radiologic imaging. A standardized approach was devised to categorize four domains of the cephalic arch. Domain I was defined as the peripheral portion of the arch and Domain IV was the distal portion of the cephalic vein near termination with the axillary vein. The magnitude of stenosis as measured by percentage was determined and compared in the four domains. Results The most frequent location for stenosis was found in domain IV when compared with domains II or I (p<0.01). The magnitude of stenosis differed across all domains (p<0.001) with the least common place for CAS in domain I. Treatment of CAS included angioplasty in all, thrombectomy in eight, and stent placement in five. Conclusions CAS occurs most commonly in the terminal portion of the arch. Four standardized domains have been defined; future work will validate these findings and determine the best intervention for each domain. PMID:25198819

  10. Three-dimensional stiffness of the carpal arch.

    Science.gov (United States)

    Gabra, Joseph N; Li, Zong-Ming

    2016-01-01

    The carpal arch of the wrist is formed by irregularly shaped carpal bones interconnected by numerous ligaments, resulting in complex structural mechanics. The purpose of this study was to determine the three-dimensional stiffness characteristics of the carpal arch using displacement perturbations. It was hypothesized that the carpal arch would exhibit an anisotropic stiffness behavior with principal directions that are oblique to the conventional anatomical axes. Eight (n=8) cadavers were used in this study. For each specimen, the hamate was fixed to a custom stationary apparatus. An instrumented robot arm applied three-dimensional displacement perturbations to the ridge of trapezium and corresponding reaction forces were collected. The displacement-force data were used to determine a three-dimensional stiffness matrix using least squares fitting. Eigendecomposition of the stiffness matrix was used to identify the magnitudes and directions of the principal stiffness components. The carpal arch structure exhibited anisotropic stiffness behaviors with a maximum principal stiffness of 16.4±4.6N/mm that was significantly larger than the other principal components of 3.1±0.9 and 2.6±0.5N/mm (pcarpal tunnel which is accounted for by the stiff transverse ligaments that tightly bind distal carpal arch. The minimal principal stiffness is attributed to the less constraining articulation between the trapezium and scaphoid. This study provides advanced characterization of the wrist׳s three-dimensional structural stiffness for improved insight into wrist biomechanics, stability, and function.

  11. [Reciprocal relationships between orthodontics and periodontics: relevance of a synergistic action].

    Science.gov (United States)

    Ngom, Papa Ibrahima; Benoist, Henri Michel; Soulier-Peigue, Delphine; Niang, Awa

    2010-03-01

    The aim of this article is to review evidence on the reciprocal relationships between orthodontics and periodontics. Normal intra-arch and inter-arch relationships have long been considered as an anatomic prerequisite for the preservation of dental health and function. Certain malocclusion traits are associated with difficulties in maintaining good oral hygiene and as a consequence to poor periodontal condition. Therefore, proper alignment of the teeth provided by orthodontic treatment may promote good control of soft deposit and calculus and subsequent periodontal inflammation. The tendency of orthodontic appliances, particularly the brackets and bands to promote the accumulation of plaque and thus increasing the risk of developing localized periodontal disease must however be constantly emphasized. Periodontitis involves progressive loss of the alveolar bone around the teeth, pathological tooth migration and gingival recession with pathological tooth migration and gingival recession as a possible outcome. The effectiveness of orthodontics in conjunction with periodontics in the management of these esthetic and functional defects is highlighted in this review.

  12. Health promotion and dental caries.

    Science.gov (United States)

    Maltz, Marisa; Jardim, Juliana Jobim; Alves, Luana Severo

    2010-01-01

    The central idea of the Brazilian health system is to prevent the establishment of disease or detect it as early as possible. Prevention and treatment of dental caries are related to behavioral factors, including dietary and oral hygiene habits, which are related to many chronic diseases. Dental health promotion therefore should be fully integrated into broadly based health-promoting strategies and actions such as food and health policies, and general hygiene (including oral hygiene), among others. For decades, a linear relationship between sugar consumption and caries has been observed. Recent data has indicated that this relationship is not as strong as it used to be before the widespread use of fluoride. However, diet is still a key factor acting in the carious process. Oral hygiene is a major aspect when it comes to caries, since dental biofilm is its etiological factor. Oral hygiene procedures are effective in controlling dental caries, especially if plaque removal is performed adequately and associated with fluoride. An alternative to a more efficient biofilm control in occlusal areas is the use of dental sealants, which are only indicated for caries-active individuals. If a cavity is formed as a consequence of the metabolic activity of the biofilm, a restorative material or a sealant can be placed to block access of the biofilm to the oral environment in order to prevent caries progress. The prevention of dental caries based on common risk-factor strategies (diet and hygiene) should be supplemented by more disease-specific policies such as rational use of fluoride, and evidence-based dental health care.

  13. Health promotion and dental caries

    Directory of Open Access Journals (Sweden)

    Marisa Maltz

    2010-01-01

    Full Text Available The central idea of the Brazilian health system is to prevent the establishment of disease or detect it as early as possible. Prevention and treatment of dental caries are related to behavioral factors, including dietary and oral hygiene habits, which are related to many chronic diseases. Dental health promotion therefore should be fully integrated into broadly based health-promoting strategies and actions such as food and health policies, and general hygiene (including oral hygiene, among others. For decades, a linear relationship between sugar consumption and caries has been observed. Recent data has indicated that this relationship is not as strong as it used to be before the widespread use of fluoride. However, diet is still a key factor acting in the carious process. Oral hygiene is a major aspect when it comes to caries, since dental biofilm is its etiological factor. Oral hygiene procedures are effective in controlling dental caries, especially if plaque removal is performed adequately and associated with fluoride. An alternative to a more efficient biofilm control in occlusal areas is the use of dental sealants, which are only indicated for caries-active individuals. If a cavity is formed as a consequence of the metabolic activity of the biofilm, a restorative material or a sealant can be placed to block access of the biofilm to the oral environment in order to prevent caries progress. The prevention of dental caries based on common risk-factor strategies (diet and hygiene should be supplemented by more disease-specific policies such as rational use of fluoride, and evidence-based dental health care.

  14. Gold color in dental alloys.

    Science.gov (United States)

    Cameron, T

    1997-01-01

    This article will help the dental laboratory with alloy selection by exploring how the relationship among color, ductility and strength applies to gold and how color can be quantified. Because higher quality materials translate into higher profits, upselling to the dentist and patient is also discussed.

  15. An arch to deal with Chernobyl; Une arche pour liquider Tchernobyl

    Energy Technology Data Exchange (ETDEWEB)

    Anon

    2009-10-15

    The preliminary works for the construction of a giant arch to cover the old sarcophagus of Chernobyl's ex-reactor No.4 are in progress. This building will have two functions: a safety barrier around the sarcophagus and a protection against bad weather in order to prepare the future dismantling of the inside using robots. The main contractor of the project is Novarka, a Bouygues-Vinci consortium who won the contract on September 18, 2007 in front of the US CH2M Hill. The end of the works is planned to March 31, 2012. 430 million euros have been invested for the improvement of Chernobyl's site safety. (J.S.)

  16. Dental Items of Interest: The Case of Delphic Sibyl by Michelangelo: Solitary Median Maxillary Central Incisor or Mesiodens.

    Science.gov (United States)

    Perciaccante, Antonio; Coralli, Alessia

    2015-01-01

    A case of an anomaly in the maxillary dental arch on "Delphic Sibyl," a fresco by Michelangelo is reported. An accurate analysis of this fresco shows a single incisor tooth is present precisely in the midline. We hypothesize that it may be a case of solitary median maxillary central incisor (SMMCI) and discuss the differential diagnosis with another similar anomaly--the mesiodens.

  17. Diabetes: Dental Tips

    Science.gov (United States)

    ... Diabetes and Oral Health > Diabetes: Dental Tips Diabetes: Dental Tips Main Content Diabetes can cause serious problems ... FOIA Web Policies Privacy Policy National Institute of Dental and Craniofacial Research National Institutes of Health Bethesda, ...

  18. Dental Exam for Children

    Science.gov (United States)

    ... they're most treatable. When to have a dental exam Various factors might determine how frequently your ... wisdom teeth (third molars) at the appropriate age. Dental X-ray A dental X-ray (radiograph) allows ...

  19. Dental Care in Pregnancy

    Science.gov (United States)

    Share with Women Dental Care in Pregnancy Why is dental care in pregnancy important? During pregnancy, you are more likely to have problems ... There are 2 major reasons women can have dental problems during pregnancy: Pregnancy gingivitis— During pregnancy, changes ...

  20. American Dental Education Association

    Science.gov (United States)

    ... Interest Groups ADEA Governance Documents and Publications ADEA Dental Faculty Code of Conduct ADEA Bylaws ADEAGies Foundation ... Benefits for Faculty ADEA Member Benefits for Allied Dental Programs ADEA Member Benefits for Dental Schools ADEA ...

  1. Dental Issues & Down Syndrome

    Science.gov (United States)

    ... Associated Conditions » Dental Issues & Down Syndrome Dental Issues & Down Syndrome Dental care is important for everybody, but people ... is Different About the Teeth of People With Down Syndrome? Delayed Eruption The teeth of people with Down ...

  2. Classification of the height and flexibility of the medial longitudinal arch of the foot

    DEFF Research Database (Denmark)

    Nilsson, Mettte Kjaergaard; Friis, Rikke; Michaelsen, Maria Skjoldahl

    2012-01-01

    BACKGROUND: The risk of developing injuries during standing work may vary between persons with different foot types. High arched and low arched feet, as well as rigid and flexible feet, are considered to have different injury profiles, while those with normal arches may sustain fewer injuries......-off values presented in this study can be used to categorize people performing standing work into groups of different foot arch types. The results of this study are important for investigating a possible link between arch height and arch movement and the development of injuries....

  3. Dental Implants.

    Science.gov (United States)

    Griggs, Jason A

    2017-10-01

    Systematic reviews of literature over the period between 2008 and 2017 are discussed regarding clinical evidence for the factors affecting survival and failure of dental implants. The factors addressed include publication bias, tooth location, insertion torque, collar design, implant-abutment connection design, implant length, implant width, bone augmentation, platform switching, surface roughness, implant coatings, and the use of ceramic materials in the implant body and abutment. Copyright © 2017 Elsevier Inc. All rights reserved.

  4. Dental Holography

    Science.gov (United States)

    Dirtoft, Ingegerd

    1983-12-01

    Ten years have passed since the first articles appeared in this new field. The qualities of the laser light together with the need of contactless 3-D measurements for different dental purposes seemed to be extremely promising, but still just a few scientists have used the method and mostly for laboratory studies. For some reason there has been a preponderance for orthodontic measurements. This seems to be a bit peculiar from holographic view compared with measurements for engineering purposes, which usually are made on metals. So naturally holography can become a clinical tool for measurements in the field of fixed bridges, removable partial dentures and implants. One of the problems is that the need for holography in dental research must be fulfilled in collaboration with physicists. Only a two-way communication during an entire experiment can balance both technical and odontological demands and thus give practical and clinical important results. The need for an easy way of handling the evaluation to get all required information is another problem and of course the holographic equipment must be converted to a box easy to handle for everyone. At last the position of dental holography today is going to be carefully examined together with an attempt to look into the hopefully exciting and not to utopic future for this research field.

  5. Dental caries.

    Science.gov (United States)

    Pitts, Nigel B; Zero, Domenick T; Marsh, Phil D; Ekstrand, Kim; Weintraub, Jane A; Ramos-Gomez, Francisco; Tagami, Junji; Twetman, Svante; Tsakos, Georgios; Ismail, Amid

    2017-05-25

    Dental caries is a biofilm-mediated, sugar-driven, multifactorial, dynamic disease that results in the phasic demineralization and remineralization of dental hard tissues. Caries can occur throughout life, both in primary and permanent dentitions, and can damage the tooth crown and, in later life, exposed root surfaces. The balance between pathological and protective factors influences the initiation and progression of caries. This interplay between factors underpins the classification of individuals and groups into caries risk categories, allowing an increasingly tailored approach to care. Dental caries is an unevenly distributed, preventable disease with considerable economic and quality-of-life burdens. The daily use of fluoride toothpaste is seen as the main reason for the overall decline of caries worldwide over recent decades. This Primer aims to provide a global overview of caries, acknowledging the historical era dominated by restoration of tooth decay by surgical means, but focuses on current, progressive and more holistic long-term, patient-centred, tooth-preserving preventive care.

  6. Danish dental education:

    DEFF Research Database (Denmark)

    Moore, Rod

    1985-01-01

    The effects of Danish cultural traditions on dental education in Denmark are described, as well as the system's current structure and developing issues. Some Danish ideas for future exports of dental education programs and dental personnel are also discussed.......The effects of Danish cultural traditions on dental education in Denmark are described, as well as the system's current structure and developing issues. Some Danish ideas for future exports of dental education programs and dental personnel are also discussed....

  7. Danish dental education:

    DEFF Research Database (Denmark)

    Moore, Rod

    1985-01-01

    The effects of Danish cultural traditions on dental education in Denmark are described, as well as the system's current structure and developing issues. Some Danish ideas for future exports of dental education programs and dental personnel are also discussed.......The effects of Danish cultural traditions on dental education in Denmark are described, as well as the system's current structure and developing issues. Some Danish ideas for future exports of dental education programs and dental personnel are also discussed....

  8. In-Plane MEMS Shallow Arch Beam for Mechanical Memory

    Directory of Open Access Journals (Sweden)

    Md Abdullah Al Hafiz

    2016-10-01

    Full Text Available We demonstrate a memory device based on the nonlinear dynamics of an in-plane microelectromechanical systems (MEMS clamped–clamped beam resonator, which is deliberately fabricated as a shallow arch. The arch beam is made of silicon, and is electrostatically actuated. The concept relies on the inherent quadratic nonlinearity originating from the arch curvature, which results in a softening behavior that creates hysteresis and co-existing states of motion. Since it is independent of the electrostatic force, this nonlinearity gives more flexibility in the operating conditions and allows for lower actuation voltages. Experimental results are generated through electrical characterization setup. Results are shown demonstrating the switching between the two vibrational states with the change of the direct current (DC bias voltage, thereby proving the memory concept.

  9. Game model of safety monitoring for arch dam deformation

    Institute of Scientific and Technical Information of China (English)

    2008-01-01

    Arch dam deformation is comprehensively affected by water pressure,temperature,dam’s structural behavior and material properties as well as other factors.Among them the water pressure and temperature are external factors(source factors) that cause dam deformation,and dam’s structural behavior and material properties are the internal factors of deformation(resistance factors).The dam deformation is the result of the mutual game playing between source factors and resistance factors.Therefore,resistance factors of structure and materials that reflect resistance character of arch dam structure are introduced into the traditional model,where structure factor is embodied by the flexibility coefficient of dam body and the maximum dam height,and material property is embodied by the elastic modulus of dam.On the basis of analyzing the correlation between dam deformation and resistance factors,the game model of safety monitoring for arch dam deformation is put forward.

  10. LANGER’S AXILLARY ARCH AND ITS CLINICAL IMPLICATIONS

    Directory of Open Access Journals (Sweden)

    Jyothi K C

    2014-09-01

    Full Text Available Introduction: The axillary arch muscle of Langer is the most common anatomical variant of axillary musculature which is of clinical and surgical importance. It may lead to neurovascular compression syndrome in the cervicoaxillary region and can be misinterpreted while examining axilla and also impairs movements of shoulder joint. Observation: During routine dissection of axilla for undergraduate teaching, an unusual muscular slip in the left axilla was observed .The muscular slip was extending from lattisimus dorsi muscle to undersurface of pectoralis major muscle, arching over axillary vessels and cords of brachial plexus. Conclusion: The axillary arch may cause obstruction to axillary vessels and nerves and may be involved in thoracic outlet syndrome and shoulder instability. The knowledge of this muscular variant could help to minimize intraoperative complications related to surgeries in or nearby axilla such as mastectomy, breast reconstruction and axillary lymphadenectomy or lymph node biopsy.

  11. In-Plane MEMS Shallow Arch Beam for Mechanical Memory

    KAUST Repository

    Hafiz, Md Abdullah Al

    2016-10-18

    We demonstrate a memory device based on the nonlinear dynamics of an in-plane microelectromechanical systems (MEMS) clamped–clamped beam resonator, which is deliberately fabricated as a shallow arch. The arch beam is made of silicon, and is electrostatically actuated. The concept relies on the inherent quadratic nonlinearity originating from the arch curvature, which results in a softening behavior that creates hysteresis and co-existing states of motion. Since it is independent of the electrostatic force, this nonlinearity gives more flexibility in the operating conditions and allows for lower actuation voltages. Experimental results are generated through electrical characterization setup. Results are shown demonstrating the switching between the two vibrational states with the change of the direct current (DC) bias voltage, thereby proving the memory concept.

  12. Burnout, depression and suicidal ideation in dental and dental hygiene students.

    Science.gov (United States)

    Deeb, George R; Braun, Sarah; Carrico, Caroline; Kinser, Patricia; Laskin, Daniel; Golob Deeb, Janina

    2017-02-27

    The aim of this study was to assess the relationship between burnout, depressive symptoms and suicidal ideation in dental and dental hygiene students and to evaluate the influence of gender, programme type and year of study. Third- and fourth-year dental (DS) and first- and second-year hygiene students (DHS) completed the Patient Health Questionnaire (PHQ-9) and an abbreviated Maslach Burnout Inventory online as measures of depressive symptoms/suicidality and burnout, respectively. The statistical analyses included summary statistics and tests for intergroup comparisons (chi-square) to evaluate the influence of gender, programme type (DHS or DS) and year of study. Correlations between depression, suicidality and burnout were also conducted. A total of 32 dental hygiene and 119 dental students participated. 40% of the dental and 38% of the hygiene students met criteria for burnout. No differences were found between years or between programmes. Nine per cent of both dental and hygiene students were above the cut-off for moderate depressive symptoms, but there were no statistical differences between the third- and fourth-year dental and the first- and second-year hygiene students. Six per cent of the dental and 9% of the dental hygiene students were above the cut-off for clinically significant suicidal ideation, but there were no statistical differences between dental and hygiene students. There were no differences noted in the dental students based on gender for any of the measures. Depression was significantly associated with all three subscales of burnout. Suicidal ideation was only significantly related to the lack of personal accomplishment subscale of burnout. These findings suggest the need for introducing preventive measures for such affective states in dental and dental hygiene training programmes. © 2017 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  13. Community socioeconomic status and children's dental health.

    Science.gov (United States)

    Gillcrist, J A; Brumley, D E; Blackford, J U

    2001-02-01

    Although a substantial decline in dental caries has occurred among U.S. children, not everyone has benefited equally. The first-ever surgeon general's report on oral health in America indicates that the burden of oral diseases is found in poor Americans. This study investigates the relationship between community socioeconomic status, or SES, and dental health of children. An oral health survey of 17,256 children, representing 93 percent of children residing in 62 Tennessee communities, was conducted in public elementary schools during the 1996-1997 school year. Portable dental equipment was used for examinations, and data from each examination were entered directly into a laptop computer. The authors performed analyses of covariance to examine the relationship between community SES (low/medium/high) and dental health, controlling for community fluoridation. Community SES was significantly related to caries experience in the primary teeth, the proportion of untreated caries in the primary and permanent teeth, dental treatment needs, dental sealants and incisor trauma. Overall, dental health was significantly worse for low-SES communities than for medium- and high-SES communities. The authors conclude that all specific dental indexes used to measure children's dental health in this study, with the exceptions of caries experience in the permanent teeth and sealant presence, were inversely related to the communities' SES. The percentage of children with dental sealants was directly related to the community's SES. Further improvements in oral health will necessitate that community-based preventive programs and access to quality dental care be made available to children who are identified as being at highest risk of experiencing oral disease.

  14. Dental students' perception of patient anxiety.

    Science.gov (United States)

    Lodge, J; Tripp, G

    1993-04-01

    This study examined the ability of dental students to assess patients' anxiety during dental treatment, and the relationship between patients' general, waiting room and clinic levels of anxiety. Sixty-six restorative dental patients and 35 Final-year dental students participated in the study. Prior to a routine dental appointment, patients completed visual analogue scales indicating their general and waiting room levels of anxiety. During treatment, patients and dental students completed similar scales to indicate patients' levels of anxiety up to and at that time. Patients' general and waiting room levels of anxiety were found to correlate significantly with their reports of anxiety during treatment. Female patients reported higher levels of anxiety than male patients. The correlations between patient and student ratings of patients' anxiety were small and non-significant, suggesting the students were not accurate in their estimates of patients' anxiety during treatment. It is suggested, therefore, that dental students be encouraged to ask patients directly how they are feeling about the dental situation. Such discussion could take place prior to, or at the beginning of, the dental appointment.

  15. American Dental Hygienists' Association

    Science.gov (United States)

    ... Resources Student Resources National Exam Student Advisor Resources Dental Hygiene Programs Scholarships and Grants Research Center Transforming Dental Hygiene Education Advocacy Practice Issues Direct Access Scope ...

  16. Management of hypoplastic aortic arch associated with neonatal coarctation.

    Science.gov (United States)

    Caspi, J; Ilbawi, M N; Muster, A; Roberson, D; Arcilla, R

    1994-12-01

    Controversy still exists as to whether hypoplastic aortic arch frequently associated with neonatal coarctation, should be enlarged at the time of coarctation repair. To determine the indications for and the outcome of repair of hypoplastic aortic arch, pre- and postoperative angiograms/echocardigraphy of 77 cases with isolated (n = 25, Group 1) or complex (n = 52, Group 2) neonatal coarctation operated upon between 1/80 and 12/89 were reviewed. Age was 5-14 days (mean 8 +/- 1.6). Aortic arch/ascending aorta diameter ratio (AR/AA) as a measure of the degree of aortic arch hypoplasia was 0.39-0.64 (0.52 +/- 0.04) in isolated and 0.15-0.47 (0.34 +/- 0.06) in complex coarctation (p < 0.05). Left subclavian flap aortoplasty was used in 72 patients; alone in 25, in combination with pulmonary artery banding in 43 patients, and simultaneously with intracardiac repair in 4 patients. Extensive reconstruction of aortic arch and coarctation with synthetic patch was performed in the remaining 5 patients (AR/AO = 0.16 +/- 0.03) using cardiopulmonary by-pass at the time of intracardiac repair. Operative mortality was 2/76 (2.5%). Follow-up is 6.6 +/- 1.4 years. Recoarctation occurred in 3 patients (4%). AR/AA increased to 0.86 +/- 0.1 in isolated (p < 0.05 vs preoperative) and to 0.7 +/- 0.1 in complex coarctation (p < 0.05 vs preoperative). In the majority of cases, hypoplastic aortic arch associated with coarctation grows satisfactorily following simple repair of coarctation with no significant residual narrowing.(ABSTRACT TRUNCATED AT 250 WORDS)

  17. Optical silencing of C. elegans cells with arch proton pump.

    Directory of Open Access Journals (Sweden)

    Ayako Okazaki

    Full Text Available BACKGROUND: Optogenetic techniques using light-driven ion channels or ion pumps for controlling excitable cells have greatly facilitated the investigation of nervous systems in vivo. A model organism, C. elegans, with its small transparent body and well-characterized neural circuits, is especially suitable for optogenetic analyses. METHODOLOGY/PRINCIPAL FINDINGS: We describe the application of archaerhodopsin-3 (Arch, a recently reported optical neuronal silencer, to C. elegans. Arch::GFP expressed either in all neurons or body wall muscles of the entire body by means of transgenes were localized, at least partially, to the cell membrane without adverse effects, and caused locomotory paralysis of worms when illuminated by green light (550 nm. Pan-neuronal expression of Arch endowed worms with quick and sustained responsiveness to such light. Worms reliably responded to repeated periods of illumination and non-illumination, and remained paralyzed under continuous illumination for 30 seconds. Worms expressing Arch in different subsets of motor neurons exhibited distinct defects in the locomotory behavior under green light: selective silencing of A-type motor neurons affected backward movement while silencing of B-type motor neurons affected forward movement more severely. Our experiments using a heat-shock-mediated induction system also indicate that Arch becomes fully functional only 12 hours after induction and remains functional for more than 24 hour. CONCLUSIONS/SGNIFICANCE: Arch can be used for silencing neurons and muscles, and may be a useful alternative to currently widely used halorhodopsin (NpHR in optogenetic studies of C. elegans.

  18. Dental Fear among Medical and Dental Undergraduates

    Directory of Open Access Journals (Sweden)

    H. Hakim

    2014-01-01

    Full Text Available Objective. To assess the prevalence and level of dental fear among health related undergraduates and to identify factors causing such fear using Kleinknecht’s Dental Fear Survey (DFS questionnaire. Methods. Kleinknecht’s DFS questionnaire was used to assess dental fear and anxiety among the entire enrollment of the medical and dental undergraduates’ of the University of Malaya. Results. Overall response rate was 82.2%. Dental students reported higher prevalence of dental fear (96.0% versus 90.4%. However, most of the fear encountered among dental students was in the low fear category as compared to their medical counterpart (69.2 versus 51.2%. Significantly more medical students cancelled dental appointment due to fear compared to dental students (P=0.004. “Heart beats faster” and “muscle being tensed” were the top two physiological responses experienced by the respondents. “Drill” and “anesthetic needle” were the most fear provoking objects among respondents of both faculties. Conclusion. Dental fear and anxiety are a common problem encountered among medical and dental undergraduates who represent future health care professionals. Also, high level of dental fear and anxiety leads to the avoidance of the dental services.

  19. [Phenomenon of dental fear].

    Science.gov (United States)

    Moore, R; Birn, H

    1990-01-01

    Odontophobia is a rather unique phobia with special psychosomatic components that impact on the dental health of odontophobic persons. It also has psychosocial components largely as a result of destruction of the teeth and subsequent embarrassment that can affect a person and cause a vicious cycle of dental fear. The phenomenon is facilitated by misunderstandings and myths generated by both patients and dentists. The most common reasons given in the literature for such strong fears of dental treatment are: 1) bad experiences in childhood for 85% of cases, 2) feeling of powerlessness and lack of control over personal emotional reactions and over the social situation in the dental chair, 3) social learning processes in which the image of the dentist is cast in a negative light by the mass media or by the person's relatives or friends and 4) that the person has other psychologic problems (in 20% of cases), such as serious phobias and/or neuroses. A strategy of researching and thus tackling the problem is presented which focuses on three essential targets that require studying and change: 1) the community at large and their image of the dentist, 2) the patient role and 3) the dentist role. Various model projects are presented along with their diagnostic systems. These are seen to focus in varying degrees on different elements of the target groups that effect the dentist-patient relationship but the need to come out into the community and make the social environment right for these patients is an important factor in all strategies.(ABSTRACT TRUNCATED AT 250 WORDS)

  20. Dental students--dental advocates.

    Science.gov (United States)

    Bensch, Brittany

    2010-01-01

    Student advocacy and involvement in the political process is built into the structure of the American Student Dental Association (ASDA), especially in its Legislative Grassroots Network and an internal communication network among students to ensure political awareness. Students are concerned with such issues as a universally accepted, non-patient-based licensure process, mid-level providers, loan availability and tax deductibility, financial support for schools, and service early in one's professional career (giving forward rather than giving back). Through collaboration with the American Dental Education Association and with many state associations, students participate in lobbying, awareness campaigns, and behind the scenes as legislative aids. Although students share the same love for the profession that animates established practitioners, they are perceived by legislators as being different. Students are involved in the legislative process because it represents their future.

  1. Planning and Analysis of an Arched Indoor Stadium

    Directory of Open Access Journals (Sweden)

    Alice T V

    2014-04-01

    Full Text Available This paper deals with planning and designing of a multilevel indoor stadium with hanging table tennis court and Olympic standard swimming pool. In order to support the large span the stadium is designed as an arched structure. The materials for the construction are chosen so as to have a minimum carbon di-oxide foot print. Static and earthquake analysis were done by using STAAD.Pro V8i. The paper also does a comparison between arched structure and plane frame structure.

  2. Aneurysm of the superficial palmar arch: a case report.

    Science.gov (United States)

    Estrella, Emmanuel P; Lee, Ellen Y

    2008-01-01

    Aneurysms of the hand are uncommon lesions. The most common location is the ulnar artery. We present a case of a young female who consulted us for a hand mass with a history of trauma to the hand. Pre-operative arteriogram showed a superficial palmar arch aneurysm. The mass was excised and the arch was reconstructed using a reversed Y-shaped vein graft. Fourteen months after surgery, there was no recurrence of the aneurysm and the patient only reported occasional cold intolerance.

  3. AORTIC ARCH-STUDY OF DIFFERENT BRANCHING PATTERNS

    Directory of Open Access Journals (Sweden)

    Nijagunappa

    2016-01-01

    Full Text Available INTRODUCTION The arch of aorta is the continuation of ascending aorta which arises from the left ventricle inside the fibrous pericardium. The arch is convex upwards, behind and somewhat towards the left sided if it has to be described in 3 dimensionally. The study was conducted in the Department of Anatomy at KMCT, Kozhikode from 2014-2015. Fifty formalin fixed heart specimens of both sexes with age ranging between 50 to 70 years were used. Mainly three types were noted.

  4. Full-arch milled titanium implant bridge: technical report.

    Science.gov (United States)

    Peché, Wendy-Ann; Van Vuuren, Ludwig Jansen; Park, Chae

    2011-09-01

    The manufacturing of full-arch fixed implant-supported bridges with the use of the traditional lost wax technique remains a technical challenge. Distortion of the alloy during casting and subsequent heating cycles during porcelain build-up causes numerous problems. Fracturing of porcelain on large restorations is difficult and costly to restore. The fitting problems can be eliminated by utilising CAD/CAM technology in the manufacturing of long-span or full-arch titanium bridges. Repair of damaged porcelain can be simplified with the use of discrete, individually-removable crowns on the bridge.

  5. Excitation of Arch and Suspension Bridges by Subwires

    Directory of Open Access Journals (Sweden)

    Noriaki Hiwatashi

    1993-01-01

    Full Text Available A force generation method using a subwire for arch and suspension bridges is proposed. The subwire is connected to the arch or the cable of the bridge through rollers. The uniform force produced by pulling and releasing the pretensioned subwires acts on the bridge as an externalforce. A new device called “the resonance force generator” is also developed to excite the bridges by applying a small force. To verify the proposed concept, a stress ribbon bridge was excited with the resonance force generator.

  6. Numerical study of free-fall arches in hopper flows

    Science.gov (United States)

    Lin, P.; Zhang, S.; Qi, J.; Xing, Y. M.; Yang, L.

    2015-01-01

    Beverloo's law describes the flow rate of grains discharging from hoppers, where the assumption of a free-fall arch (FFA) is very useful in understanding the physical picture of this process. The FFA has been observed in previous experiments but a clear systematic study of the FFA is still necessary. In this paper, dense granular flow in hoppers was studied by numerical simulations, in attempts to explore the free-fall region and its boundary. Generally, the numerical simulation results support the free-fall arch assumption, although the statistical description of the FFA is not exactly equivalent to its strict definition.

  7. Self-tapping Intermaxillary Fixation Screw: An Alternative to Arch Bar.

    Science.gov (United States)

    Barodiya, Animesh; Thukral, Rishi; Agrawal, S M; Chouhan, Anil S; Singh, Sidharth; Loksh, Yogesh

    2017-02-01

    The use of intermaxillary fixation (IMF) in the treatment of faciomaxillary fractures is the key factor for reduction and immobilization. Various techniques of IMF have been described in the past and recently IMF screws have been introduced. This technique has various advantages, including ease of use, less time consumption, less trauma to the surrounding soft tissues, and relatively reduced risk of needle stick injury. This study evaluates the efficacy of IMF screws over arch bar IMF before definitive fixation of facial fractures. This study is a randomized clinical study. Study population consists of 20 patients with mandibu-lar fractures requiring IMF with open reduction and reported to Department of Oral Surgery, Modern Dental College and Research Centre, Indore, Madhya Pradesh, India between September 2012 and April 2015. Two groups were formed with 10 patients in each group. In the first group, IMF was achieved using the Erich's arch bar and wires. In the second group, IMF was achieved using self-tapping IMF screw. The patients were assessed for various parameters, such as the time required in minutes for the IMF stability of fixation, postoperative occlusion, postoperative pain, periodontal health, oral hygiene, and incidence of needle stick injury. All the cases had stable IMF in both groups. At the end of 14th day, overall oral hygiene was poor in group I and good in group II, significant statistically (p = 0.031). Iatrogenic injury to tooth was absent in group I and present in 1 case in group II, not significant statistically (p = 0.305). Average time taken for the IMF in group I was 74.9 minutes, with the range of 58 to 88 minutes, and in group II was 16.1 minutes, with the range of 11 to 22 minutes, which is highly significant statistically (p = 0.001). Needle stick injuries were taken as positive if glove perforation was present and these were reported in four cases in group I, whereas in group II, no case had incidence of needle stick injuries, which

  8. Possible causal relationships between competitive swimming in growing age and three-dimensional dentoalveolar development.

    Science.gov (United States)

    Silvestrini-Biavati, Armando; Capurro, Claudia; Ugolini, Alessandro; Butti, Andrea Carlo; Salvato, Antonino

    2013-07-26

    The aim of this study was to investigate possible links between competitive swimming during the growth phase and the development of the dentoalveolar arches. The study sample included 100 swimmers and a control group of 100 age-matched non-swimmers who had never practised swimming or related sports. Subjects who had had previous orthodontic treatment were excluded. Overjet, overbite, sagittal and transverse parameters, arch dimension, crowding and oral habits were recorded. In the swimmers, there was a significantly higher frequency of molar symmetry (P=0.04), together with a greater number of Class I subjects. The overjet in the swimmers was mainly normal, but the arch dimensions were significantly wider (+10% in the upper arch; Pcompetitive swimming during the growth phase has a favourable effect on dental arch development in the sagittal, vertical and transverse planes.

  9. Anatomical variations of the anterior atlanto-dental joint and relations to the apical and alar ligaments in a geriatric population.

    Science.gov (United States)

    Rustagi, Tarush; Iwanaga, Joe; Sardi, Juan P; Alonso, Fernando; Oskouian, Rod J; Tubbs, R Shane

    2017-08-17

    Degenerative changes in the upper cervical spine may be age related degeneration or a pathological process such as rheumatoid arthritis. However, to our knowledge, the relationship between the apical and alar ligaments and these anomalies has not been discussed. We present anatomical variations of the anterior atlanto-dental joint observed during cadaveric dissection of adult craniovertebral junctions, the relationship with the alar and apical ligaments and discuss possible origins and clinical implications. The upper cervical spine including part of the occiput was dissected from cadavers whose mean age at death was 78.9 years-old. The anterior atlanto-dental joint and apical and alar ligaments were observed and any atypical findings were noted. In eleven specimens, seven had a dens corona, three had an os odontoideum and one had a dens aureola, which arose from the upper part of the anterior arch of the atlas. Only four specimens had an apical ligament. The possible etiologies and the clinical applications of these craniovertebral anomalies in a geriatric population should be appreciated by the clinician treating patients with disease in this area or interpreting imaging in the region. Copyright © 2017 Elsevier Inc. All rights reserved.

  10. Collaboration between dental faculties and National Dental Associations (NDAs) within the World Dental Federation-European Regional Organization zone: an NDAs perspective.

    Science.gov (United States)

    Yamalik, Nermin; Mersel, Alex; Cavalle, Edoardo; Margvelashvili, Vladimer

    2011-12-01

    Although improvements in certain oral health measures have been achieved, many global oral health matters and challenges exist. Collaborations and partnerships among various institutions are crucial in solving such problems. The main aim of the present study was to analyse the nature and extent of the partnership between dental faculties and National Dental Associations (NDAs). A questionnaire was developed, focusing on the relationship between NDAs and dental faculties within the World Dental Federation-European Regional Organization (FDI-ERO) zone with regard to major professional activities, such as dental education (both undergraduate and continuing education), workforce issues, improvement of national oral health, and science and knowledge transfer. The questionnaire was sent to all member NDAs within the ERO zone. The response rate was 21/41 (53.65%). The major activities in which NDAs were found to be involved were improvement of national oral health (100%), followed by continuing education activities (90%), whereas the activity which received least involvement was the development of an undergraduate dental curriculum (52%). The NDAs perceived their relationship with dental faculties to be quite satisfactory in the fields of continuing education, science and knowledge transfer, and the implementation of new technologies into daily dental practice. However, it was suggested that their relationship needed significant improvement with regard to the development of an undergraduate dental education curriculum, dental workforce issues and negotiations with the authorities regarding professional matters/issues. As the two important elements of organised dentistry, NDAs and dental faculties have a significant role to play in the improvement of oral health and in finding solutions to global oral health challenges; therefore, their collaboration and partnership are crucial for this purpose. On the basis of the perceptions of NDAs regarding their relationship with

  11. 糖尿病与牙髓病根尖周病关系的研究发展%The Relationship Between Diabetes and Dental Pulp Disease Periapical Dis-ease Research and Development

    Institute of Scientific and Technical Information of China (English)

    宋岩

    2016-01-01

    Objective By comparing the diabetic and non-diabetic dental pulp disease periapical disease the clinical effi-cacy of root canal treatment, to discuss diabetes relations with dental pulp disease periapical disease. Methods From Jan-uary 2014 to December of dental pulp disease admitted in the oral cavity hospital in zhuhai on periapical disease, dental pulp disease periapical randomly selected 200 cases of diabetes patients and 200 cases of diabetes dental pulp disease pe-riapical disease comparison research, respectively, set it to diabetes and non-diabetic group. All patients for disposable root canal treatment, after treatment, the VAS pain score of two groups of patients to evaluate the degree of pain; In half a year after treatment for the patient follow-up and review, compare the diabetic and non-diabetic dental pulp disease periapical disease line the clinical curative effect of root canal treatment. Results The VAS score of diabetic group compared with non-diabetic group significantly higher (P < 0.05). Treatment after six months of follow-up, in patients with the review found that the success rate of the treatment of patients with diabetes mellitus group was 86%, significantly less than 94% of the group of patients without diabetes (P< 0.05). Conclusion Diabetes and dental pulp disease periapical disease there is close relationship, the pathological changes of diabetes, dental pulp disease periapical disease range and extent than non-diabetic dental pulp disease periapical disease is more serious, as a result, the prognosis of dental pulp disease periapical disease diabetes compared with non-diabetic patients effect worse, in the clinical treatment of diabetes in the process of dental pulp disease periapical disease, patients should pay attention to the effective control of blood sugar.%目的:通过对比糖尿病与非糖尿病牙髓病根尖周病行根管治疗的临床疗效,以探讨糖尿病与牙髓病根尖周病的关系。方法于2014年1

  12. Influence of space of double row piles on soil arching effect

    Directory of Open Access Journals (Sweden)

    Zhao bo

    2015-02-01

    Full Text Available FLAC3d software, based on continuous theory, is used to analysis influence of space of double row piles on soil arching effect. The result shows that different from single row pile, double row piles will produce soil arching effect at front pile and rear pile severally, this phenomenon is called multiple soil arching effect; the residual load of front of front row pile will increase,the soil arch zone and the soil arching effect will decrease with the continuous increase of double row pile spacing.At the same time the soil arching effect of rear pile decreases, while the soil arching effect of front pile increases and finally the soil arching effect between front pile and rear pile will be equal.

  13. The surgical importance of an axillary arch in sentinel node biopsy.

    LENUS (Irish Health Repository)

    Ridgway, P F

    2011-03-01

    When Carl Langer described the aberrant axillary arch in 1846 its relevance in sentinel node biopsy (SNB) surgery could not have been contemplated. The authors define an incidence and elucidate relevance of the arch in SNB of the axilla.

  14. Thoracoscopic Resection of a Rare Case of Hemangioma of the Azygos Venous Arch

    Directory of Open Access Journals (Sweden)

    Ma Husai

    2017-01-01

    Full Text Available Hemangioma of the azygos venous arch is an exceedingly rare incident. This is a case of a thoracoscopic complete resection of a hemangioma of the azygos venous arch in a 37-year-old woman.

  15. Posterior partially edentulous jaws, planning a rehabilitation with dental implants.

    Science.gov (United States)

    Monteiro, Douglas R; Silva, Emily V F; Pellizzer, Eduardo P; Filho, Osvaldo Magro; Goiato, Marcelo C

    2015-01-16

    To discuss important characteristics of the use of dental implants in posterior quadrants and the rehabilitation planning. An electronic search of English articles was conducted on MEDLINE (PubMed) from 1990 up to the period of March 2014. The key terms were dental implants and posterior jaws, dental implants/treatment planning and posterior maxilla, and dental implants/treatment planning and posterior mandible. No exclusion criteria were used for the initial search. Clinical trials, randomized and non randomized studies, classical and comparative studies, multicenter studies, in vitro and in vivo studies, case reports, longitudinal studies and reviews of the literature were included in this review. One hundred and fifty-two articles met the inclusion criteria of treatment planning of dental implants in posterior jaw and were read in their entirety. The selected articles were categorized with respect to their context on space for restoration, anatomic considerations (bone quantity and density), radiographic techniques, implant selection (number, position, diameter and surface), tilted and pterygoid implants, short implants, occlusal considerations, and success rates of implants placed in the posterior region. The results derived from the review process were described under several different topic headings to give readers a clear overview of the literature. In general, it was observed that the use of dental implants in posterior region requires a careful treatment plan. It is important that the practitioner has knowledge about the theme to evaluate the treatment parameters. The use of implants to restore the posterior arch presents many challenges and requires a detailed treatment planning.

  16. Immediate loading of 2 (all-on-2) versus 4 (all-on-4) implants placed with a flapless technique supporting mandibular cross-arch fixed prostheses: preliminary results from a pilot randomised controlled trial.

    Science.gov (United States)

    Cannizzaro, Gioacchino; Felice, Pietro; Soardi, Elisa; Ferri, Vittorio; Leone, Michele; Esposito, Marco

    2011-01-01

    To evaluate the clinical outcome of 2 implants versus 4 implants placed flapless in fully edentulous mandibles and immediately restored with metal-resin screw-retained cross-arch prostheses. Sixty patients from two different centres were randomised: 30 to the allon- 2 group and 30 to the all-on-4 group. To be immediately loaded, implants had to be inserted with a minimum torque of 40 Ncm. Outcome measures were prosthesis and implant failures, and biological and biomechanical complications. Flaps were raised in 18 patients. Two implants in 2 patients did not reach the planned insertion torque and were immediately replaced by larger diameter ones. Four months after loading, no drop-out or implant failure occurred. One biomechanical complication occurred in the all-on-2 group versus 4 in the all-on-4 group. There were no statistically significant differences between groups for complications. There were no differences between centres. These very preliminary results, just 4 months after loading, suggest that immediately loaded mandibular cross-arch fixed dental prostheses can be supported by only 2 dental implants. Longer follow-ups (around 10 years) are needed to understand whether cross-arch mandibular prostheses can be successfully supported by only 2 dental implants.

  17. Prevalence of dental resorptive lesions in Swedish cats.

    Science.gov (United States)

    Pettersson, A; Mannerfelt, T

    2003-09-01

    Ninety-six, randomly selected Swedish cats were evaluated for the presence of dental resorptive lesions. All cats were examined while receiving general anesthesia. Diagnosis was based on oral examination and full-mouth, intraoral dental radiographs. Information concerning age, sex, vaccination status, eating habits, food type, environment (indoor or outdoor housing), oral, discomfort, dental care, and medical treatment was recorded. Hematologic samples included analysis for FeLV, FIV, and calcivirus. Of the cats examined in this study, 32% had gross or radiographic signs of dental resorptive lesions. There was a positive relationship between the occurrence of dental resorptive lesions and increasing age.

  18. Dental erozyon

    NARCIS (Netherlands)

    Özen, B.; Yönel, N.; Çetiner, S.

    2015-01-01

    Dental erozyon, plak içermeyen diş yüzeyleri üzerinde içsel ve dışsal asitlerin veya şelatların etkileriyle oluşan kimyasal bir aşınmadır. İçsel ve/veya dışsal kaynaklar nedensel faktörler olarak tanımlanırken tükürük ve pelikıl gibi biyolojik faktörler, yeme ve içme alışkanlıkları ve ağız hijyeni

  19. [Treatment of adult bimaxillary arch protrusion with micro-implant anchorage].

    Science.gov (United States)

    Chen, Cheng; Zhang, Xiao-Rong

    2015-02-01

    In this study, micro-implants were used in 15 adult patients with mild and moderate bimaxillary arch protrusion or crowding. Cephalometric analysis was used to analyze hard and soft-tissues change before and after treatment, with the aim to investigate the effects of treatment on adult bimaxillary arch protrusion with micro-implant anchorage. Fifteen adult patients with mild and moderate bimaxillary arch protrusion were selected in this study. Micro-implants were inserted into the zygomaticoalveolar ridge of maxilla and the external oblique line of mandible. A NiTi coil spring was attached to the micro-implant to drag the whole upper and lower dentition for distal movement. Cephalometrics were taken before and after treatment, and the changes of soft and hard-tissue profile were studied. SPSS13.0 software package was used to analyze the data. (1)Sixty micro-implants remained stable.(2)SNA, SNB had no significant changes (P>0.05), and the relationship between the maxilla and the mandible did not change significantly. U1/NA, U1-NA, L1/NB, L1-NB and U1/L1 changes in hard tissue had significant difference in cephalometric measurement (P<0.05). The upper and lower anterior teeth were more retrusive, and the tipping of incisor decreased significantly.(3)Cephalometric analysis showed that lateral appearance improved and soft tissue cephalometric-related measurements such as Cm-Sn-UL,LL-B'-Pos increased significantly (P<0.01). (4)Molars and incisors acquired distal movement. Micro-implant can provide not only excellent skeletal anchorage but also a novel way to distalize the whole dentition efficiently.

  20. Reliability and Correlation of Static and Dynamic Foot Arch Measurement in a Healthy Pediatric Population.

    Science.gov (United States)

    Scholz, Timo; Zech, Astrid; Wegscheider, Karl; Lezius, Susanne; Braumann, Klaus-Michael; Sehner, Susanne; Hollander, Karsten

    2017-07-14

    Measurement of the medial longitudinal foot arch in children is a controversial topic, as there are many different methods without a definite standard procedure. The purpose of this study was to 1) investigate intraday and interrater reliability regarding dynamic arch index and static arch height, 2) explore the correlation between both arch indices, and 3) examine the variation of the medial longitudinal arch at two different times of the day. Eighty-six children (mean ± SD age, 8.9 ± 1.9 years) participated in the study. Dynamic footprint data were captured with a pedobarographic platform. For static arch measurements, a specially constructed caliper was used to assess heel-to-toe length and dorsum height. A mixed model was established to determine reliability and variation. Reliability was found to be excellent for the static arch height index in sitting (intraday, 0.90; interrater, 0.80) and standing positions (0.88 and 0.85) and for the dynamic arch index (both 1.00). There was poor correlation between static and dynamic assessment of the medial longitudinal arch (standing dynamic arch index, r = -0.138; sitting dynamic arch index, r = -0.070). Static measurements were found to be significantly influenced by the time of day (P static arch height index is influenced by gender (P = .004), whereas dynamic arch index is influenced by side (P = .011) and body mass index (P static foot measurements are reliable for medial longitudinal foot arch assessment in children. The variation of static arch measurements during the day has to be kept in mind. For clinical purposes, static and dynamic arch data should be interpreted separately.