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Sample records for bovine permanent teeth

  1. Dental fluorosis in bovine temporary teeth

    Energy Technology Data Exchange (ETDEWEB)

    Suttie, J.W.; Clay, A.B.; Shearer, T.R.

    1985-02-01

    Deciduous incisors from calves born to dams fed an average of 40 mg of fluoride/kg of forage ration (40 ppm) were compared with incisors from calves born to dams fed a normal dairy ration. Skeletal fluoride concentration in the calves born to fluoride-fed dams was increased 5 to 8 fold, but enamel mottling and hypoplasia, typical of permanent bovine incisor dental fluorosis were not seen by gross, histologic, or radiologic examination. Decreases in the amount of enamel on the tooth or hardness of the enamel were not observed. These data do not support recent reports of widespread dental fluorosis of deciduous bovine teeth as a clinical sign of fluoride toxicity.

  2. HYPODONTIA OF PERMANENT TEETH IN A KENYAN POPULATION

    African Journals Online (AJOL)

    Of the children with hypodontia, about 80 % lacked one or two teeth, 54 % had ... of patients prior to removal of permanent teeth for orthodontic reasons. INTRODUCTION .... (iv) extraction of the primary teeth followed by immediate orthodontic ...

  3. Traumatic intrusion of permanent teeth. Part 1. An epidemiological study of 216 intruded permanent teeth.

    Science.gov (United States)

    Andreasen, Jens Ove; Bakland, Leif K; Matras, Rannva C; Andreasen, Francis Meriam

    2006-04-01

    An epidemiological study of traumatic intrusion of permanent teeth was performed on 216 teeth in 151 patients treated over a 50-year period at a major trauma center in Denmark (Copenhagen). This analysis showed that intrusion of permanent teeth was of rare injury only affecting 1.9% of traumatic injuries involving permanent teeth. The main etiologic factor appeared to be falling which resulted in axial impacts on maxillary or mandibular teeth. The most common injury patterns were intrusion without additional injuries (33.5%) and intrusion with crown fractures (60.5%). A few cases were combinations of intrusion and either crown/root-fractures or root fractures (6%). Most often one tooth was intruded (46.3%), followed by two teeth (32.4% ) and three or more teeth (21.3%). The majority of intruded teeth were displaced 2-8 mm. The age group of 6-12 years of age was most frequently involved and boys appeared to experience intrusion injuries more frequently than girls, and at an earlier age. Maxillary central and lateral incisors are the primary victims of intrusions and this seems to be identical to other trauma types and is possibly related to the known exposure to impacts of maxillary incisors. The reliability of clinical findings, such as lack of mobility (81.8%), metallic percussion tone (72.5%), and no pain to percussion (66%) was reasonably high, whereas a radiographic feature such as the obliteration of the periodontal ligament space appeared to be only a partly reliable diagnostic tool (52%).

  4. Triplication in permanent teeth: A rare case report

    Directory of Open Access Journals (Sweden)

    Nidhi Gera

    2017-01-01

    Full Text Available Fusion is an anomaly manifested in both deciduous and permanent dentitions. Triple tooth refers to the union of three separate tooth entities. It can involve the normal dentition or supernumerary teeth. Triplication is rarely encountered in deciduous and permanent dentition with an incidence of 0.02%. The case presented herein describes a rare case of triplication in permanent maxillary incisors and supernumerary teeth in a 15-year-old female.

  5. Modular Permanent Magnet Machines with Alternate Teeth Having Tooth Tips

    OpenAIRE

    Li, G. J.; Zhu, Z.Q.; Foster, M. P.; Stone, D. A.; Zhan, H.L.

    2015-01-01

    This paper presents single layer modular permanent magnet machines with either wound or unwound teeth with tooth tips. The structures with wound teeth having tooth tips are suitable for modular machines with slot number higher than pole number to compensate for the drop in winding factor due to the flux gaps in alternate stator teeth, accordingly to maintain or even to increase their average torques. However, the structures with unwound teeth having tooth tips are suitable for modular machine...

  6. Caries detection in primary teeth is less challenging than in permanent teeth

    Directory of Open Access Journals (Sweden)

    Fausto M Mendes

    2013-01-01

    Full Text Available Introduction: Most studies about caries detection methods have been performed using permanent teeth. Primary teeth, however, present significant differences from permanent teeth; hence findings of these studies with permanent teeth cannot be extrapolated. The Hypothesis: Our hypothesis is that the caries diagnosis process in primary teeth is less challenging than in permanent teeth. This assertion is based on the fact that primary enamel is thinner and the caries process progresses faster in this type of teeth when compared to permanent teeth. For these reasons, the majority of caries lesions in primary teeth would be more evident and therefore, easily detected through visual inspection. Only a few number of caries lesions would be missed by visual inspection. Thus, adjunct diagnostic methods, such as radiographs, would be unnecessary for primary teeth. Evaluation of the Hypothesis: To evaluate this hypothesis, researchers should conduct studies about the performance of the caries detection methods avoiding selection bias and defining appropriate settings. Clinical trials randomizing the diagnostic strategies would be worthwhile. The evidence supporting the benefits of adjunct methods in detecting caries lesions in primary lesions is limited. However, clinical guidelines have recommended the use of the radiographic method to detect caries in primary teeth in all symptomless children. The confirmation of our hypothesis would lead to the need to re-evaluate such guidelines.

  7. Sexual dimorphism in permanent teeth of modern Greeks.

    Science.gov (United States)

    Zorba, Eleni; Moraitis, Konstantinos; Manolis, Sotiris K

    2011-07-15

    Sex determination is considered an important step in reconstructing the biological profile of unknown individuals from a forensic context. Forensic anthropologists have long used teeth as an additional tool for sex determination as they resist postmortem destruction. In this case the use of population-specific data is necessary since sexual dimorphism varies between different populations. Currently there are no odontometric standards for determining sex in Greek populations. The purpose of this study is to examine the degree of sexual dimorphism in permanent teeth of modern Greeks. A total of 839 permanent teeth in 133 individuals (70 males and 63 females) from the Athens Collection were examined. Mesiodistal and buccolingual crown and cervical diameters of both maxillary and mandibular teeth were measured. It was found that males have bigger teeth than females and in 65 out of 88 dimensions measured, male teeth exceeded female teeth significantly (P<0.05). Canines were the most dimorphic teeth followed by first premolars, maxillary second premolar and mandibular second molar. Although other teeth were also sexually dimorphic they did not have a statistically significant difference in all dimensions. The most dimorphic dimension was buccolingual cervical diameter followed by buccolingual crown diameter. A comparison of sexual dimorphism in teeth between different populations showed that it differs among different groups. European population groups presented the highest degree of sexual dimorphism in teeth whereas Native South Americans the lowest.

  8. Electron probe microananlysis of fluorotic bovine teeth

    Energy Technology Data Exchange (ETDEWEB)

    Shearer, T.R.; Kolstad, D.L.; Suttie, J.W.

    1978-09-01

    Incisor teeth were obtained from adult cattle which since 4 months of age to 5 or 6 years were maintained on rations containing a yearly average of 40 ppM F in the forage. Microchemical analyses were performed on the fluorotic bovine incisors. The microdistribution of fluoride varied markedly at different sites within the same tooth. Fluoride concentrations varied with depth from the tooth surface and were influenced by the concentrations of fluoride present in the forage during amelogenesis, and the presence of hypoplastic pits and hyperplastic coronal cementum in enamel. The cementum in these lesions contained remarkably high concentrations of fluoride, and it was less calcified and more porous than adjacent enamel. 5 figures.

  9. Comparative analysis of human and bovine teeth: radiographic density

    Directory of Open Access Journals (Sweden)

    Jefferson Luis Oshiro Tanaka

    2008-12-01

    Full Text Available Since bovine teeth have been used as substitutes for human teeth in in vitro dental studies, the aim of this study was to compare the radiographic density of bovine teeth with that of human teeth to evaluate their usability for radiographic studies. Thirty bovine and twenty human teeth were cut transversally in 1 millimeter-thick slices. The slices were X-rayed using a digital radiographic system and an intraoral X-ray machine at 65 kVp and 7 mA. The exposure time (0.08 s and the target-sensor distance (40 cm were standardized for all the radiographs. The radiographic densities of the enamel, coronal dentin and radicular dentin of each slice were obtained separately using the "histogram" tool of Adobe Photoshop 7.0 software. The mean radiographic densities of the enamel, coronal dentin and radicular dentin were calculated by the arithmetic mean of the slices of each tooth. One-way ANOVA demonstrated statistically significant differences for the densities of bovine and human enamel (p 0.05. Based on the results, the authors concluded that: a the radiographic density of bovine enamel is significantly higher than that of human enamel; b the radiodensity of bovine coronal dentin is statistically lower than the radiodensity of human coronal dentin; bovine radicular dentin is also less radiodense than human radicular dentin, although this difference was not statistically significant; c bovine teeth should be used with care in radiographic in vitro studies.

  10. The effects of impacted premaxillary supernumerary teeth on permanent incisors

    Energy Technology Data Exchange (ETDEWEB)

    Jung, Yun Hoa; Kim, Ji Yeon; Cho, Bong Hae [School of Dentistry, Pusan National University, Yangsan (Korea, Republic of)

    2016-12-15

    The aim of this study was to examine the radiographic features associated with impacted premaxillary supernumerary teeth, to determine the relationship between their characteristics and their effects on permanent incisors, and to investigate the types of orthodontic treatment that patients received after the extraction of impacted supernumerary teeth. The clinical records and radiographs of 193 patients whose impacted premaxillary supernumerary teeth were removed were retrospectively reviewed, and 241 impacted supernumerary teeth were examined. Cone-beam computed tomographic images and panoramic radiographs were examined to determine the number, location, sagittal position, orientation, and morphology of the supernumerary teeth. Their effects on permanent incisors and the orthodontic treatment received by patients after the extraction of the supernumeraries were also investigated. Supernumerary teeth were most frequently observed in the central incisor region, in the palatal position, in the inverted orientation, and were most commonly conical in shape. The most common complication was median diastema, followed by displacement and delayed eruption of the adjacent incisors. Ten (71.4%) of the 14 odontomas showed delayed eruption of the adjacent incisors. Displacement of the incisors was more frequently observed in association with supernumerary teeth with tuberculate or supplemental shapes. Orthodontic traction was most frequently performed after the removal of odontomas. In 32 cases (13.3%), permanent incisors erupted after the orthodontic creation of sufficient space. Median diastema was most common complication. The delayed eruption of incisors was common in supernumerary teeth with a vertical orientation and an odontoma shape.

  11. The effects of impacted premaxillary supernumerary teeth on permanent incisors

    Science.gov (United States)

    Jung, Yun-Hoa; Kim, Ji-Yeon

    2016-01-01

    Purpose The aim of this study was to examine the radiographic features associated with impacted premaxillary supernumerary teeth, to determine the relationship between their characteristics and their effects on permanent incisors, and to investigate the types of orthodontic treatment that patients received after the extraction of impacted supernumerary teeth. Materials and Methods The clinical records and radiographs of 193 patients whose impacted premaxillary supernumerary teeth were removed were retrospectively reviewed, and 241 impacted supernumerary teeth were examined. Cone-beam computed tomographic images and panoramic radiographs were examined to determine the number, location, sagittal position, orientation, and morphology of the supernumerary teeth. Their effects on permanent incisors and the orthodontic treatment received by patients after the extraction of the supernumeraries were also investigated. Results Supernumerary teeth were most frequently observed in the central incisor region, in the palatal position, in the inverted orientation, and were most commonly conical in shape. The most common complication was median diastema, followed by displacement and delayed eruption of the adjacent incisors. Ten (71.4%) of the 14 odontomas showed delayed eruption of the adjacent incisors. Displacement of the incisors was more frequently observed in association with supernumerary teeth with tuberculate or supplemental shapes. Orthodontic traction was most frequently performed after the removal of odontomas. In 32 cases (13.3%), permanent incisors erupted after the orthodontic creation of sufficient space. Conclusion Median diastema was most common complication. The delayed eruption of incisors was common in supernumerary teeth with a vertical orientation and an odontoma shape. PMID:28035303

  12. Partial pulpotomy in young permanent teeth with deep carious lesions.

    Science.gov (United States)

    Mejàre, I; Cvek, M

    1993-12-01

    The material comprised 37 young posterior teeth with deep carious lesions and exposed pulps, treated with partial pulpotomy and dressed with calcium hydroxide. The teeth were divided into two groups. Group 1 consisted of 31 teeth with no clinical or radiographic symptoms before treatment, Group 2 of 6 teeth with temporary pain, widened periodontal space periapically and/or productive osteitis, i.e. increased density of the surrounding alveolar bone. After an observation time of 24 to 140 months (mean = 56 months), healing had occurred in 29 of 31 teeth in Group 1 (93.5%) and in 4 of 6 teeth in Group 2. It was concluded that the present, as well as previously reported results indicate that partial pulpotomy may be an adequate treatment for young permanent molars with a carious exposure, although more studies are needed before the treatment can be recommended for routine clinical use.

  13. Treatment of ectopic first permanent molar teeth.

    LENUS (Irish Health Repository)

    Hennessy, Joe

    2012-11-01

    Ectopic eruption of the first permanent molar is a relatively common occurence in the developing dentition. A range of treatment options are available to the clinician provided that diagnosis is made early. Non-treatment can result in premature exfoliation of the second primary molar, space loss and impaction of the second premolar. This paper will describe the management of ectopic first permanent molars, using clinical examples to illustrate the available treatment options. CLINICAL RELEVANCE: This paper is relevant to every general dental practitioner who treats patients in mixed dentition.

  14. Sealants for preventing dental decay in the permanent teeth

    DEFF Research Database (Denmark)

    Ahovuo-Saloranta, Anneli; Forss, Helena; Walsh, Tanya

    2013-01-01

    in preventing caries in children and adolescents when compared to no sealants. Their effectiveness may be related to the caries prevalence in the population. OBJECTIVES: To compare the effects of different types of fissure sealants in preventing caries in permanent teeth in children and adolescents. SEARCH...... of age. DATA COLLECTION AND ANALYSIS: Two review authors independently screened search results, extracted data and assessed trial quality. We calculated the odds ratio (OR) for caries or no caries on occlusal surfaces of permanent molar teeth. For trials with a split-mouth design, the Becker...... or the baseline caries prevalence.- Resin-based sealant compared with no sealant: Compared to control without sealant, second or third or fourth generation resin-based sealants prevented caries in first permanent molars in children aged 5 to 10 years (at 2 years of follow-up odds ratio (OR) 0.12, 95% confidence...

  15. Congenital oligodontia of the deciduous teeth and anodontia of the permanent teeth in a cat.

    Science.gov (United States)

    Vieira, Ana Luiza S; Ocarino, Natalia de M; Boeloni, Jankerle N; Serakides, Rogeria

    2009-02-01

    This report describes a rare case of congenital oligodontia of the deciduous teeth and anodontia of the permanent teeth in a cat. According to cat's veterinarian, the patient had only two deciduous upper canines and no permanent teeth had ever erupted. Post-mortem evaluation showed a complete absence of teeth in the oral cavity and inflammatory lesions were not found on the gums. Histopathological analysis of serial sections of maxilla and mandible revealed absence of odontogenic epithelium, inflammatory cells and odontoclastic resorptive lesions. Diagnosis was confirmed after both the establishment that there were no remaining dental structures and the exclusion of other relevant diseases that lead to tooth loss, such as periodontal disease, renal fibrous osteodystrophy, odontoclastic resorptive lesions, ectodermal dysplasia and trauma.

  16. Sealants for preventing dental decay in the permanent teeth

    DEFF Research Database (Denmark)

    Ahovuo-Saloranta, Anneli; Forss, Helena; Walsh, Tanya;

    2013-01-01

    or the baseline caries prevalence.- Resin-based sealant compared with no sealant: Compared to control without sealant, second or third or fourth generation resin-based sealants prevented caries in first permanent molars in children aged 5 to 10 years (at 2 years of follow-up odds ratio (OR) 0.12, 95% confidence...... 2012). SELECTION CRITERIA: Randomised or quasi-randomised controlled trials of at least 12 months duration comparing sealants for preventing caries of occlusal or approximal surfaces of premolar or molar teeth with no sealant or different type of sealant in children and adolescents under 20 years...... of age. DATA COLLECTION AND ANALYSIS: Two review authors independently screened search results, extracted data and assessed trial quality. We calculated the odds ratio (OR) for caries or no caries on occlusal surfaces of permanent molar teeth. For trials with a split-mouth design, the Becker...

  17. Cleidocranial dysplasia presenting with retained deciduous teeth and impacted permanent and supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Mahalakshmi Ikkanur Puttaranganaik

    2014-01-01

    Full Text Available Cleidocranial dysplasia is a disease that occurs secondary to a dominant autosomal inheritance. There is no predilection for any genre or ethnic group. As there is a delay in the eruption and/or absence of permanent teeth, the patients usually report to a dental surgeon for replacement of the missing teeth. This condition is characterized by several cranial malformations and underdevelopment, absence of clavicles, and multiple impacted supernumerary and permanent teeth. The diagnosis of the condition is usually based on the presence of the above-mentioned main features and on clinical and familial evidence. Here we report a rare case of cleidocranial dysplasia in a male patient, having most of the characteristic features of this syndrome.

  18. Aspiration of two permanent teeth during maxillofacial injuries.

    Science.gov (United States)

    Xiao, Wen-lin; Zhang, Dai-zun; Wang, Yan-hui

    2009-03-01

    Aspiration of a tooth in maxillofacial injuries is a known complication necessitating prompt recognition and early treatment to minimize potentially serious and, sometimes, even fatal consequences. Here, we report a rare and unusual case in its presentation, the patient having aspirated 2 permanent teeth after maxillofacial, cervical vertebrae, and thoracic region crush injuries due to a motor vehicle accident. The diagnosis of teeth aspiration was delayed until 2 weeks after the event. An aspirated anterior tooth was expectorated by the patient himself, and the other aspirated anterior tooth was removed by flexible bronchoscopy. The paper also emphasizes that clinicians must be aware of dental injury resulting from maxillofacial injuries and account for all teeth as part of their evaluation, keeping an open mind as to where a missing tooth might be located. A rapid diagnosis depends on high clinical suspicion, clinical signs, and radiologic findings.

  19. Maturogenesis of non-vital immature permanent teeth.

    Science.gov (United States)

    Kalaskar, Ritesh R; Kalaskar, Ashita R

    2013-04-01

    Pulpal necrosis in young permanent teeth often results in teeth with open apex, thin root walls and poor crown root ratio. Out of the available treatment options maturogenesis has been the most conservative option that exploits full potential of pulp for dentin deposition. Maturogenesis involves disinfecting the root canal system followed by stimulation of blood clot from the periapical tissue, which provides a matrix into which the cell could grow and sealing the coronal excess. In the present case report, tri antibacterial paste (3 Mix) was used as an intracanal medicament that proved successful in stimulating vital pulp cells of the periapical region for maturogenesis. Five months radiograph follow-up showed thickening of lateral dentinal walls, which progress until 15 months resulting in apical closure, thickening of lateral dentinal walls and increase root length.

  20. Maturogenesis of non-vital immature permanent teeth

    Directory of Open Access Journals (Sweden)

    Ritesh R Kalaskar

    2013-01-01

    Full Text Available Pulpal necrosis in young permanent teeth often results in teeth with open apex, thin root walls and poor crown root ratio. Out of the available treatment options maturogenesis has been the most conservative option that exploits full potential of pulp for dentin deposition. Maturogenesis involves disinfecting the root canal system followed by stimulation of blood clot from the periapical tissue, which provides a matrix into which the cell could grow and sealing the coronal excess. In the present case report, tri antibacterial paste (3 Mix was used as an intracanal medicament that proved successful in stimulating vital pulp cells of the periapical region for maturogenesis. Five months radiograph follow-up showed thickening of lateral dentinal walls, which progress until 15 months resulting in apical closure, thickening of lateral dentinal walls and increase root length.

  1. Traumatic injuries to permanent teeth in Turkish children, Ankara.

    Science.gov (United States)

    Altun, Ceyhan; Ozen, Buğra; Esenlik, Elçin; Guven, Günseli; Gürbüz, Taşkin; Acikel, Cengizhan; Basak, Feridun; Akbulut, Erman

    2009-06-01

    The aim of this study was to identify the types and etiologies of dento-alveolar injuries among patients who were treated for injuries to maxillary and/or mandibular permanent teeth at the Gulhane Medical Academy, Department of Pediatric Dentistry, Center of Dental Sciences in Ankara, Turkey to provide a basis for determining optimal treatment approaches and educational needs. From a total of 4956 children aged 6-12 years (mean age: 8.91 +/- 1.95) applying to the Center, 472 children (9.5%) were found to have suffered dental injuries during a period of 2 years. Injuries were classified according to drawings and texts based on the WHO classification system, as modified by Andreasen and Andreasen. Injury rates were highest among children age 6 and ages 8-10. The most frequently injured permanent teeth were the maxillary central incisors (88.2%), and the maxillary right central permanent incisor made up 47.2% of all injured teeth. The most common cause of dental trauma was falling while walking or running (40.3%). Most injuries involved a single tooth (64.8%). The most common type of injury was enamel fracture (44.6%). There was a significant difference in gender, where boys more often suffered from a dental hard tissue and pulp injury than girls (P = 0.019), whereas there was no difference in gender (P = 0.248) in the distribution of periodontal injuries. Injuries were found to occur more frequently during the summer (P trauma, preventive orthodontic treatment in early mixed dentition may play an important role in reducing traumatic dental injuries.

  2. Shear bond strength and fracture analysis of human vs. bovine teeth.

    Directory of Open Access Journals (Sweden)

    Stefan Rüttermann

    Full Text Available PURPOSE: To evaluate if bovine enamel and dentin are appropriate substitutes for the respective human hard tooth tissues to test shear bond strength (SBS and fracture analysis. MATERIALS AND METHODS: 80 sound and caries-free human erupted third molars and 80 freshly extracted bovine permanent central incisors (10 specimens for each group were used to investigate enamel and dentine adhesion of one 2-step self-etch (SE and one 3-step etch and rinse (E&R product. To test SBS the buccal or labial areas were ground plane to obtain appropriate enamel or dentine areas. SE and E&R were applied and SBS was measured prior to and after 500 thermocycles between +5 and +55°C. Fracture analysis was performed for all debonded areas. RESULTS: ANOVA revealed significant differences of enamel and dentin SBS prior to and after thermocycling for both of the adhesives. SBS- of E&R-bonded human enamel increased after thermocycling but SE-bonded did not. Bovine enamel SE-bonded showed higher SBS after TC but E&R-bonded had lower SBS. No differences were found for human dentin SE- or E&R-bonded prior to or after thermocycling but bovine dentin SE-bonded increased whereas bovine dentine E&R-bonded decreased. Considering the totalized and adhesive failures, fracture analysis did not show significances between the adhesives or the respective tooth tissues prior to or after thermocycling. CONCLUSION: Although SBS was different on human and bovine teeth, no differences were found for fracture analysis. This indicates that solely conducted SBS on bovine substrate are not sufficient to judge the perfomance of adhesives, thus bovine teeth are questionnable as a substrate for shear bond testing.

  3. [Spontaneous loss of permanent teeth in children is never innocent].

    Science.gov (United States)

    Wit, M A; van der Meij, E H; Hooimeijer, L H; de Vries, T W

    2013-06-01

    A 13-year-old patient spontaneously lost tooth 47. In addition, he had for several weeks experienced numbness of the lower lip and the chin on the right side, fatigue, weakness, loss of appetite, and weight loss. After extensive investigation he seemed to be suffering from a Burkitt lymphoma. Spontaneous loss of permanent teeth in children has an extensive differential diagnosis. Dentists should be familiar with this differential diagnosis as all possible diagnoses are related to serious pathologies. The differential diagnosis includes infectious, metabolic, naplastic, and odontogenic causes. Systematic history taking, physical examination and laboratory investigations will lead to a proper diagnosis.

  4. Supragingival Microbial Profiles of Permanent and Deciduous Teeth in Children with Mixed Dentition

    National Research Council Canada - National Science Library

    Shi, Weihua; Qin, Man; Chen, Feng; Xia, Bin

    2016-01-01

    The present study was designed to investigate the microbial profiles of teeth in different locations in mixed-dentition-stage children, and to compare the microbiomes of permanent and deciduous teeth...

  5. Phenotypic and growth characterization of human mesenchymal stem cells cultured from permanent and deciduous teeth

    Directory of Open Access Journals (Sweden)

    Revathi Shekar

    2012-01-01

    Conclusions: Permanent and deciduous teeth are both viable sources of stem cells. The permanent teeth were easier to culture because of a lower chance of contamination with oral microflora. The growth characteristics of the cells obtained from both these sources were similar. However, there was a difference in the ratio of fibroblastoid cells to epithelioid cells between the cultures obtained from the permanent and deciduous teeth.

  6. Angle Class II malocclusion treated with extraction of permanent teeth.

    Science.gov (United States)

    Barreto, Gustavo Mattos

    2013-01-01

    Angle Class II malocclusion associated with anterior open bite in adult patients demands a carefully elaborated orthodontic planning, aiming at restoring not only harmonious dental and facial esthetics, but also a balanced masticatory function. Orthognathic surgery or permanent teeth extraction are often the choice of treatment, therefore, treatment decision is related to all dental, skeletal and functional aspects. The present report discusses orthodontic compensation carried out by means of upper premolar extraction performed to correct the Class II canine relationship and, consequently, the anterior open bite, accepting that the upper incisors be retroclined. This clinical case was presented to the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO) as part of the requirements for obtaining the BBO Certification.

  7. Angle Class II malocclusion treated with extraction of permanent teeth

    Directory of Open Access Journals (Sweden)

    Gustavo Mattos Barreto

    2013-08-01

    Full Text Available Angle Class II malocclusion associated with anterior open bite in adult patients demands a carefully elaborated orthodontic planning, aiming at restoring not only harmonious dental and facial esthetics, but also a balanced masticatory function. Orthognathic surgery or permanent teeth extraction are often the choice of treatment, therefore, treatment decision is related to all dental, skeletal and functional aspects. The present report discusses orthodontic compensation carried out by means of upper premolar extraction performed to correct the Class II canine relationship and, consequently, the anterior open bite, accepting that the upper incisors be retroclined. This clinical case was presented to the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO as part of the requirements for obtaining the BBO Certification.

  8. Bond strength with various etching times on young permanent teeth

    Energy Technology Data Exchange (ETDEWEB)

    Wang, W.N.; Lu, T.C. (School of Dentistry, National Defense Medical Center, Taipei, Taiwan (China))

    1991-07-01

    Tensile bond strengths of an orthodontic resin cement were compared for 15-, 30-, 60-, 90-, or 120-second etching times, with a 37% phosphoric acid solution on the enamel surfaces of young permanent teeth. Fifty extracted premolars from 9- to 16-year-old children were used for testing. An orthodontic composite resin was used to bond the bracket directly onto the buccal surface of the enamel. The tensile bond strengths were tested with an Instron machine. Bond failure interfaces between bracket bases and teeth surfaces were examined with a scanning electron microscope and calculated with mapping of energy-dispersive x-ray spectrometry. The results of tensile bond strength for 15-, 30-, 60-, or 90-second etching times were not statistically different. For the 120-second etching time, the decrease was significant. Of the bond failures, 43%-49% occurred between bracket and resin interface, 12% to 24% within the resin itself, 32%-40% between resin and tooth interface, and 0% to 4% contained enamel fragments. There was no statistical difference in percentage of bond failure interface distribution between bracket base and resin, resin and enamel, or the enamel detachment. Cohesive failure within the resin itself at the 120-second etching time was less than at other etching times, with a statistical significance. To achieve good retention, to decrease enamel loss, and to reduce moisture contamination in the clinic, as well as to save chairside time, a 15-second etching time is suggested for teenage orthodontic patients.

  9. Longevity of posterior resin composite restorations in permanent teeth in Public Dental Health Service

    DEFF Research Database (Denmark)

    Pallesen, Ulla; van Dijken, Jan W V; Halken, Jette;

    2013-01-01

    To investigate in a prospective follow up the longevity of posterior resin composites (RC) placed in permanent teeth of children and adolescents attending Public Dental Health Service.......To investigate in a prospective follow up the longevity of posterior resin composites (RC) placed in permanent teeth of children and adolescents attending Public Dental Health Service....

  10. Mesiodistal crown diameters of the primary and permanent teeth in southern Chinese--a longitudinal study.

    Science.gov (United States)

    Yuen, K K; So, L L; Tang, E L

    1997-12-01

    The mesiodistal crown diameters of the primary and permanent teeth were measured on serial casts of 112 Hong Kong Southern Chinese (61 males and 51 females) taken at 5.68 and 12.31 years of age. None of the teeth showed significant sex difference in bilateral asymmetry, and significant bilateral asymmetry was found only for the upper primary second molars. The asymmetries were small and the sizes of the antimeres were averaged. Posterior teeth were generally less variable than anterior teeth in both dentitions in Chinese, which is contrary to other reports, but the anterior tooth of each morphological class was, in general, less variable than the posterior member. Male teeth were larger than those of females except for the lower central and lateral incisors in both dentitions, but the difference was not statistically significant. None of the primary teeth nor three of the permanent teeth were found to have significant sex differences in size. Percentage sexual dimorphism ranged from 0.06 to 1.97 per cent for the primary teeth and from 0.36 to 5.27 per cent for the permanent teeth. In the primary dentition, molars were the most dimorphic teeth in both arches, while upper incisors and lower canine were the least dimorphic teeth in their own arch. Among the permanent teeth, the canines were the most dimorphic and the incisors were among the least dimorphic teeth in both arches. Tooth sizes in both dentitions were, in general, larger than those of the Caucasians, comparable with Northern Chinese, but smaller than those of Australian Aboriginals.

  11. Papillon-lefevre Syndrome : Improvement of Skin Lesions After the Loss of Permanent Teeth

    Directory of Open Access Journals (Sweden)

    Shaw N

    2000-01-01

    Full Text Available A case of Papillon-Lefevre syndrome (PLS showed improvement of skin lesions after the loss of permanent teeth which is an unusual feature. The case is being reported because of this feature.

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

    National Research Council Canada - National Science Library

    Siéssere, Selma; Vitti, Mathias; Sousa, Luiz Gustavo de; 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...

  13. Influence of Different Rotor Teeth Shapes on the Performance of Flux Switching Permanent Magnet Machines Used for Electric Vehicles

    OpenAIRE

    Jing Zhao; Yashuang Yan; Bin Li; Xiangdong Liu; Zhen Chen

    2014-01-01

    This paper investigated a 12-slot/11-pole flux switching permanent magnet (FSPM) machine used for electric vehicles (EVs). Five novel rotor teeth shapes are proposed and researched to reduce the cogging torque and torque ripple of the FSPM machine. These rotor teeth shapes are notched teeth, stepped teeth, eccentric teeth, combination of notched and stepped teeth, and combination of notched and eccentric teeth. They are applied on the rotor and optimized, respectively. The influences of diffe...

  14. Marginal adaptation and performance of bioactive dental restorative materials in deciduous and young permanent teeth.

    OpenAIRE

    Elizabeta Gjorgievska; John W. Nicholson; Snezana Iljovska; Slipper, Ian J.

    2008-01-01

    Objective: The aim of this study was to investigate the adaptation of different types of restorations towards deciduous and young permanent teeth. Materials and Methods: Class V cavities were prepared in deciduous and young permanent teeth and filled with different materials (a conventional glass-ionomer, a resin-modified glass-ionomer, a poly-acid-modified composite resin and a conventional composite resin). Specimens were aged in artificial saliva for 1, 6, 12 and 18 months, then examined b...

  15. Root maturation and dentin–pulp response to enamel matrix derivative in pulpotomized permanent teeth

    OpenAIRE

    Darwish, Sherif S; Shadia H Abd El Meguid; Wahba, Nadia A; Ahmed A-R Mohamed; Wojciech Chrzanowski; Abou Neel, Ensanya A.

    2014-01-01

    The success of pulpotomy of young permanent teeth depends on the proper selection of dressing materials. This study aimed to evaluate the histological and histomorphometric response of dentin–pulp complex to the enamel matrix derivative (Emdogain® gel) compared to that of calcium hydroxide when used as a pulp dressing in immature young permanent dogs’ teeth. Dentin-like tissues bridging the full width of the coronal pu...

  16. Dental Age and Tooth Development in Orthodontic Patients with Agenesis of Permanent Teeth

    Directory of Open Access Journals (Sweden)

    Jozo Badrov

    2017-01-01

    Full Text Available Objective. To compare the development of permanent teeth in a group of children with the congenitally missing permanent teeth (CMPT and corresponding nonaffected group. Methods. The formation stages of all developing permanent teeth were determined on 345 panoramic radiographs (OPTs by the method of Haavikko (1970, and dental age was calculated. The paired samples t-test was used to compare the differences between dental age (DA and chronological age (CA in those with CMPT and those not affected. Spearman test was used to evaluate the correlation between DA-CA and the number of missing teeth. The Wilcoxon signed rank test was used to compare the development of the teeth adjacent to the place of the agenesis with matched pair in corresponding nonaffected group. Results. Dental age was significantly delayed in CMPT children compared to the nonaffected group (p<0.001. The mean differences were −0.57 ± 1.20 years and −0.61 ± 1.23 years in males and females, without difference between sexes (p=0.763. The number of missing teeth affected the delay only in females (p=0.024. Only mesial teeth in females were significantly delayed in development when compared to the nonaffected group (p=0.007. Conclusion. Our findings show that the development of the permanent teeth is delayed when compared to the nonaffected group of the same sex and age.

  17. Microstructure and mineral composition of dental enamel of permanent and deciduous teeth.

    Science.gov (United States)

    De Menezes Oliveira, Maria Angélica Hueb; Torres, Carolina Paes; Gomes-Silva, Jaciara Miranda; Chinelatti, Michelle Alexandra; De Menezes, Fernando Carlos Hueb; Palma-Dibb, Regina Guenka; Borsatto, Maria Cristina

    2010-05-01

    This study evaluated and compared in vitro the microstructure and mineral composition of permanent and deciduous teeth's dental enamel. Sound third molars (n = 12) and second primary molars (n = 12) were selected and randomly assigned to the following groups, according to the analysis method performed (n = 4): Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Energy dispersive X-ray spectrometer (EDS). Qualitative and quantitative comparisons of the dental enamel were done. The microscopic findings were analyzed statistically by a nonparametric test (Kruskal-Wallis). The measurements of the prisms number and thickness were done in SEM photomicrographs. The relative amounts of calcium (Ca) and phosphorus (P) were determined by EDS investigation. Chemical phases present in both types of teeth were observed by the XRD analysis. The mean thickness measurements observed in the deciduous teeth enamel was 1.14 mm and in the permanent teeth enamel was 2.58 mm. The mean rod head diameter in deciduous teeth was statistically similar to that of permanent teeth enamel, and a slightly decrease from the outer enamel surface to the region next to the enamel-dentine junction was assessed. The numerical density of enamel rods was higher in the deciduous teeth, mainly near EDJ, that showed statistically significant difference. The percentage of Ca and P was higher in the permanent teeth enamel. The primary enamel structure showed a lower level of Ca and P, thinner thickness and higher numerical density of rods. (c) 2009 Wiley-Liss, Inc.

  18. A possible association between early apical resorption of primary teeth and ectodermal characteristics of the permanent dentition

    DEFF Research Database (Denmark)

    Bille, M L B; Kvetny, M J; Kjaer, I

    2008-01-01

    The hypothesis of this study is that children with unexpected early apical resorption of the primary teeth are also predisposed to resorption in the permanent dentition. Accordingly, the aim was to perform a longitudinal study focussing on the permanent teeth in children with unexpected early api...... dentition: In all 12 children, dental deviations in the permanent dentition were observed. Additionally, idiopathic external apical resorption of the permanent teeth was seen in three children, two of whom had received orthodontic treatment....

  19. Genome-wide association study identifies four loci associated with eruption of permanent teeth

    DEFF Research Database (Denmark)

    Geller, Frank; Feenstra, Bjarke; Zhang, Hao

    2011-01-01

    The sequence and timing of permanent tooth eruption is thought to be highly heritable and can have important implications for the risk of malocclusion, crowding, and periodontal disease. We conducted a genome-wide association study of number of permanent teeth erupted between age 6 and 14 years...

  20. Correlation between the strength of glass ionomer cements and their bond strength to bovine teeth.

    Science.gov (United States)

    Hibino, Yasushi; Kuramochi, Ken-ichi; Harashima, Atsushi; Honda, Muneaki; Yamazaki, Atsushi; Nagasawa, Yuko; Yamaga, Taniichiro; Nakajima, Hiroshi

    2004-12-01

    This study examined the possible correlation between the strength of glass ionomers and their adhesive strength to bovine teeth. The shear bond strengths of three different brands of glass ionomer mixed at four different P/L ratios to bovine teeth were measured 24 hours after the cement specimens were prepared. The correlation between shear bond strength and mechanical strength reported in our previous study was also examined. No significant (p > 0.05) increases in the bond strength to bovine teeth were found in any of the cements when the mixing ratio increased. The present study showed no significant (p > 0.05) correlation between mechanical strength of cement and its bond strength to bovine teeth. Rather than trying to increase the strength of the cement, it would be more effective to enhance the adhesive bond strength through procedures such as surface conditioning or cleaning of the tooth structure when glass ionomers are used as luting agents.

  1. 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.

  2. Research on early quantitating artificial demineralization of bovine permanent teeth using the average gray value of optical coherence tomography images%利用光学相干断层图像平均灰度值定量研究牛恒牙早期人工脱矿

    Institute of Scientific and Technical Information of China (English)

    徐延勇; 姚晖; 李燕妮; 连小丽; 张林朴; 王冠华; 代晓华

    2010-01-01

    目的 研究经酸蚀脱矿后牛恒牙光学相干断层图像平均灰度值的变化,探讨平均灰度值作为一个参数指标定量检测牛恒牙早期脱矿的可行性.方法 以正常离体牛恒牙为样本,采用凝胶酸蚀法制备人工脱矿模型;用光学相干断层摄影术对人工脱矿模型扫描成像,利用Matlab软件计算不同酸蚀时间脱矿区牙体层110 μm范围内的平均灰度值.将测得图像灰度和归一化后图像灰度,分别进行单因素方差分析.结果 牙体表层110 μm范围内不同时间酸蚀脱矿区的平均灰度值从大到小依次为30 min酸蚀脱矿区、1O min酸蚀脱矿区、0 min酸蚀脱矿区,图像灰度归一化后做单因素方差分析,P<0.05.结论 牙体表层110 μm范围内不同酸蚀时间脱矿区平均灰度值差异有统计学意义,并随脱矿时间增加而增大,即平均灰度值可以用于光学相干断层摄影术定量检测牙齿的早期脱矿.光学相干断层图像灰度归一化使得不同酸蚀脱矿区的平均灰度值更有可比性,减小了由于样本之间差异引起的误差,提高了平均灰度值作为参数指标定量检测牙齿早期脱矿的可靠性.%Objective To investigate the feasibility of the average gray value as a parameter index for early quantification detection of artificial demineralization by studying the changes of average gray value on optical coherence tomography (OCT) images of bovine permanent teeth etched.Methods Early stage of artificial demineralization mould was created by etching the experimental normal isolated bovine permanent teeth surface.Images of the artificial demineralization mould were obtained by OCT,and then the average gray value within the 110 μm under the teeth surface was calculated by Matlab software.The gray value and the normalized gray value were analyzed by ANOVA,respectively.Results On the OCT images,the average gray value within the 110 μm under the teeth surface form high to low were the

  3. Periapical and endodontic status of permanent teeth in patients with hypophosphatemic rickets

    DEFF Research Database (Denmark)

    Andersen, Mette Guldbæk; Beck-Nielsen, Signe; Haubek, Dorte

    2012-01-01

    genetically. The aim of the present study was to describe the periapical and endodontic status of permanent teeth in patients with genetically and/or biochemically confirmed HR. The patients were recruited from a medical study on HR patients. The patients underwent a dental examination including a digital...... panoramic radiograph, which was scored for endodontically affected teeth (i.e. teeth with periapical radiolucencies and/or endodontically treated teeth). A total of 52 patients (age range: 5·7-74·5 years; 17 males and 35 females) were included. HR patients were characterised by a high number...... of endodontically affected teeth (mean: 4·2; s.d.: 5·0). The number of affected teeth rose significantly with age (P ...

  4. Dental Age and Tooth Development in Orthodontic Patients with Agenesis of Permanent Teeth.

    Science.gov (United States)

    Badrov, Jozo; Lauc, Tomislav; Nakaš, Enita; Galić, Ivan

    2017-01-01

    Objective. To compare the development of permanent teeth in a group of children with the congenitally missing permanent teeth (CMPT) and corresponding nonaffected group. Methods. The formation stages of all developing permanent teeth were determined on 345 panoramic radiographs (OPTs) by the method of Haavikko (1970), and dental age was calculated. The paired samples t-test was used to compare the differences between dental age (DA) and chronological age (CA) in those with CMPT and those not affected. Spearman test was used to evaluate the correlation between DA-CA and the number of missing teeth. The Wilcoxon signed rank test was used to compare the development of the teeth adjacent to the place of the agenesis with matched pair in corresponding nonaffected group. Results. Dental age was significantly delayed in CMPT children compared to the nonaffected group (p development when compared to the nonaffected group (p = 0.007). Conclusion. Our findings show that the development of the permanent teeth is delayed when compared to the nonaffected group of the same sex and age.

  5. Reasons underlying the extraction of permanent teeth in patients attending Peoples Dental College and Hospital.

    Science.gov (United States)

    Dixit, L P; Gurung, C K; Gurung, N; Joshi, N

    2010-12-01

    Extraction of permanent teeth is common in Nepal. The study was undertaken to determine the causes and pattern of missing permanent teeth among patients attending Peoples Dental College and Hospital (PDCH) and to see if there is any association between variables like socio economic status, patient education level, dental visit and extraction of permanent teeth. A prospective cross sectional survey was carried out in patients attending the Department of Oral Surgery in PDCH between August 2006 and October 2006. The data was collected by trained clinician through clinical examination and using semi- structured questionnaires. Computer software SPSS 15 was used for statistical analysis. In age groups caries was the most common reason for extraction of teeth. In age groups > 30 years, 55.6% periodontal disease was the most common reason for extraction of teeth. Distribution by type of teeth and dental disease was highly significant where. Dental caries was the reason for extraction of first permanent molar. Distribution by education level and visit to dentist was highly significant. About 93.1% of the people who were illiterate visited the dental surgeon while in pain and 76.0% of the university level graduates visited the dentist while in pain. Caries and its sequel remain the most important cause of tooth loss throughout adult life along with periodontal diseases at later stages.

  6. Fracture strength of composite fixed partial denture using bovine teeth as a substitute for human teeth with or without fiber-reinforcement.

    Science.gov (United States)

    Soares, Carlos José; Barbosa, Liliane Minglini; Santana, Fernanda Ribeiro; Soares, Priscilla Barbosa Ferreira; Mota, Adérito Soares da; Silva, Gisele Rodrigues da

    2010-01-01

    This study evaluate the use of bovine teeth as a substitute for human teeth on fracture strength tests of composite fixed partial dentures (Cpd), with and without fiberglass reinforcement (Fg). Eighty teeth were selected, being 40 bovine incisors, 20 human premolars and 20 molars. Bovine incisors were ground to get a platform, simulating an occlusal surface of human molar. Teeth in pairs were embedded in polystyrene resin, simulating the periodontal ligament and divided in 4 groups: B-Cpd-Fg: bovine teeth restored with Cpd with Fg; B-Cpd-NFg: bovine teeth restored with Cpd without Fg; H-Cpd-Fg: human teeth restored Cpd with Fg; and H-Cpd-NFg: human teeth restored with Cpd without Fg. The Cpd were adhesively fixed and submitted to an axial compression load at the pontic center with a crosshead speed of 0.5 mm/min until fracture. Failure modes were assessed and classified. Data were subjected to two-way ANOVA and Tukey's HSD test (α=0.05). The tooth type had no influence on fracture strength and fracture mode. The inclusion of fiberglass increased significantly the fracture strength. The failure modes were more reparable in groups with fiber-reinforcement. Bovine teeth can be used as a substitute for human teeth in these types of fracture strength tests.

  7. HYBRID LAYER THICKNESS IN PRIMARY AND PERMANENT TEETH – A COMPARISON BETWEEN TOTAL ETCH ADHESIVES

    Directory of Open Access Journals (Sweden)

    Natalia Gateva

    2012-05-01

    Full Text Available Purpose: The aim this study is to compare the hybrid layer thickness and its micromorphological characteristics in samples from primary and permanent teeth following application of total etch adhesives.Materials and methods: On intact specimens of 20 primary and 10 permanent teeth was created flat dentin surfaces. The patterns were divided in 6 groups. Two different total etch adhesive systems were used – one tree steps (OptiBond, Kerr and one two steps (Exite, VivaDent. In groups 3, 4, 5 and 6 recommended etching time was used - 15 s, in groups 1 and 2 the etching time was reduced to 7 s. After applying the adhesive, resin composite build-ups were constructed. Thus restored samples are stored in saline solution for 24 hours at temperature 37 C. Then they are subjected to thermal stress in temperature between 5 C to 55 C for 1,500 cycles and to masticatory stress – 150,000 cycles with force 100 N in intervals of 0.4 s. After that the teeth are cut through the middle in medio-distal direction with a diamond disc. SEM observation was done to investigate the thickness of the hybrid layer and the presence of microgaps. Statistical analysis was performed with ANOVA and Tukey׳s tests.Results: SEM observation showed significant differences of the hybrid layer thickness between primary and permanent teeth under equal conditions and after different etching time. Group 6 presented the highest average thickness 8.85 μ and group 1 the lowest average in hybrid layer 3.74 μ.Conclusion: In primary teeth the hybrid layer thickness increases with the increased etching time. The hybrid layer thickness in primary teeth is greater than that of the hybrid layer in permanent teeth under equal conditions. For primary teeth it is more appropriate to reduce the etching time to 7s to obtain a hybrid layer with better quality

  8. Mesiodistal root angulation of permanent teeth in children with mixed dentition and normal occlusion

    Directory of Open Access Journals (Sweden)

    Flávia A. S. Jesuino

    2010-12-01

    Full Text Available OBJECTIVE: There is little information regarding the mesiodistal angulation of permanent teeth in mixed dentition. The aim of this study was to evaluate mesiodistal root angulation of permanent incisors, canines and first molars of 100 Brazilian children, using a new horizontal reference plane based on the midpoint of the intercuspation of primary canines and permanent first molars in panoramic radiographs during the mixed-dentition phase. MATERIAL AND METHODS: Children were equally divided between the genders with a mean age of 8.9 years (SD=0.76, normal occlusion and no eruptive disturbances. RESULTS: The angulation of the permanent maxillary first molars was close to the vertical, whereas the mandibular molars presented approximately 25 degrees of distal root angulation. The maxillary canines were the most distally angulated teeth, whereas the permanent mandibular canines were vertically positioned. The evaluation of the anterior maxillary area showed vertical position of permanent lateral, and central incisors with a slight distal angulation, whereas the permanent mandibular incisors tended to a mesial radicular convergence. CONCLUSIONS: The proposed reference line could be useful in mixed dentition root angulation evaluation; there was a slight asymmetry in the mesiodistal angulation among homologous teeth, and also a small variation between the male and the female groups, but no difference between 8-and 10-year-old children.

  9. Angle Class I malocclusion with anterior open bite treated with extraction of permanent teeth

    Directory of Open Access Journals (Sweden)

    Matheus Melo Pithon

    2013-04-01

    Full Text Available This clinical case reports the orthodontic treatment of a Class I malocclusion with anterior open bite and bimaxillary dentoalveolar protrusion in a 28-year-old female patient. The treatment of choice was to perform tooth extractions followed by retraction of the anterior teeth, with consequent closure of the anterior open bite and better accommodation of the teeth on their bony bases. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO, representing the Category 2 - i.e., an Angle Class I malocclusion, with anterior open bite, treated with extraction of permanent teeth -, as part of the requisites to become a BBO diplomate.

  10. Angle Class I malocclusion with anterior open bite treated with extraction of permanent teeth.

    Science.gov (United States)

    Pithon, Matheus Melo

    2013-01-01

    This clinical case reports the orthodontic treatment of a Class I malocclusion with anterior open bite and bimaxillary dentoalveolar protrusion in a 28-year-old female patient. The treatment of choice was to perform tooth extractions followed by retraction of the anterior teeth, with consequent closure of the anterior open bite and better accommodation of the teeth on their bony bases. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO), representing the Category 2 -- i.e., an Angle Class I malocclusion, with anterior open bite, treated with extraction of permanent teeth --, as part of the requisites to become a BBO diplomate.

  11. Surgical management of multiple supernumerary teeth and an impacted maxillary permanent central incisor.

    Science.gov (United States)

    Rallan, Mandeep; Rallan, Neelakshi Singh; Goswami, Mousumi; Rawat, Kamini

    2013-05-22

    Hyperdontia is the condition of having supernumerary teeth, or teeth which appear in addition to the regular number of teeth. It is a developmental anomaly and has been argued to arise from multiple aetiologies. The most common site is the maxillary incisor region; but the prevalence of more than three teeth supernumerary tooth is less than 1%. A case of 13 year male patient is reported with a multiple impacted supernumerary tooth in maxillary anterior region hindering the eruption of right permanent central incisor. The supernumerary tooth was treated via surgical approach followed by an interim prosthesis for permanent central incisor which later on erupted in due course of time. Background Supernumerary teeth may be defined as any teeth or tooth substance in excess of the usual configuration of 20 deciduous and 32 permanent teeth. The presence of supernumerary teeth in the premaxillary region often poses unique diagnostic and managerial concerns for the practitioner. Rarely is the surplus number compensated by an absence or deficiency of other teeth. Therefore, the dysfunctional nature of supernumerary teeth and their ability to create a variety of pathological disturbances in the normal eruption and position of adjacent teeth warrants their early detection and prudent management. Approximately 76-86% of cases represent single-tooth hyperdontia, with two supernumerary teeth noted in 12-23% and three or more extra teeth noted in less than 1% of cases. Multiple supernumerary teeth are also associated with many syndromes like cleidocranial dysplasia and Gardner’s syndrome etc. However, it is rare to find multiple supernumeraries in individuals with no other associated disease or syndrome. In such cases, the maxillary anterior region is the common site of occurrence. The exact aetiology is not clearly understood. The supernumerary teeth result from any disturbance in the initiation and proliferation stages of odontogenesis. There are several theories regarding the

  12. Management of a rare case of idiopathic multiple unerupted impacted permanent teeth in an adult female patient

    Directory of Open Access Journals (Sweden)

    Karunakar Shetty

    2016-01-01

    Full Text Available This clinical case report describes the multi-disciplinary approach in the management of an unusual presentation of idiopathic multiple unerupted impacted permanent teeth in a 20-year-old female patient. The case was unique in that, not only were there multiple missing permanent teeth, but also over retained deciduous teeth and attrited existing permanent teeth with loss of vertical dimension of occlusion. Since the patient was young, it was decided to retain all the erupted permanent teeth and extract the infected deciduous teeth with the objective of fabricating overlay complete dentures. This is a simple, reversible and an economical treatment modality, which satisfies both the esthetic and functional demands where the extraction of teeth is not generally indicated and, in addition, provides a stable occlusion.

  13. Regenerative endodontic treatment of permanent teeth after completion of root development: a report of 2 cases.

    Science.gov (United States)

    Paryani, Khimiya; Kim, Sahng G

    2013-07-01

    Clinical regenerative endodontic treatment has been focused on immature necrotic teeth, but it should be extended to mature teeth as an alternative to conventional endodontic treatment. There have been no clinical reports to attempt to revascularize pulp in the entire root canals of mature necrotic teeth. The present report describes the treatment of mature, necrotic, permanent incisors with apical periodontitis by using regenerative endodontic therapy. In this case report, modified regenerative endodontic procedures were used to enhance the probability of pulp revasuclarization in mature necrotic teeth. At the first appointment, the root canals were mechanically instrumented to the apices with a large apical size by using the step-back technique and irrigated copiously with antimicrobial solution. Intracanal medicaments (calcium hydroxide or ciprofloxacin) were placed in the root canals. At the following appointment, the root canals were irrigated with antimicrobial solution, and bleeding was induced into the root canals by passing hand files beyond apices. Collagen membranes were placed in the canals as a matrix against which mineral trioxide aggregate was placed. Glass ionomer was used to restore the teeth. The resolution of apical radiolucency and regression of clinical signs and symptoms were observed at recall appointments. The present report presents modified regenerative endodontic procedures for mature necrotic permanent teeth. Further clinical studies with a large number of cases are needed to investigate the outcome of regenerative endodontic therapy for mature necrotic teeth. Copyright © 2013 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  14. Frequency of root resorption following trauma to permanent teeth.

    Science.gov (United States)

    Soares, Adriana J; Souza, Gustavo A; Pereira, Andrea C; Vargas-Neto, Julio; Zaia, Alexandre A; Silva, Emmanuel J N L

    2015-06-01

    This retrospective study evaluated the frequency of development of root resorption in dental trauma cases involving supporting tissue. For 249 traumatized teeth of 125 patients aged between 7 and 51 years, we collected data on the gender and age of the patient, the teeth involved, the type of trauma, and the period between dental injury and initial examination. Radiographic parameters examined in relation to root resorption included the presence of inflammatory external root resorption, internal root resorption, replacement resorption, and canal calcification. Data were analyzed by chi-squared test, Fisher's exact test, and mult iple logistic regression (P resorption (P = 0.0199), as well as the type of injury (P = 0.0406). Furthermore, external resorption was most frequently associated with intrusive luxation (92.8%), followed by avulsion (89.0%), lateral luxation (80.2%), and extrusive luxation (77.4%). Among the types of dental injury, replacement resorption was observed more frequently in cases of avulsion (87.2%). The only factor that was significantly associated with this type of resorption was the type of injury (P resorption is observed more frequently and its risk of development is higher in cases of severe trauma, especially avulsion and intrusive luxation.

  15. Sealants for preventing dental decay in the permanent teeth

    DEFF Research Database (Denmark)

    Ahovuo-Saloranta, Anneli; Forss, Helena; Walsh, Tanya

    2013-01-01

    interval (CI) 0.07 to 0.19, six trials (five published in the 1970s and one in 2012), at low risk of bias, 1259 children randomised, 1066 children evaluated, moderate quality evidence). If we were to assume that 40% of the control tooth surfaces were decayed during 2 years of follow-up (400 carious teeth...... per 1000), then applying a resin-based sealant will reduce the proportion of the carious surfaces to 6.25% (95% CI 3.84% to 9.63%); similarly if we were to assume that 70% of the control tooth surfaces were decayed (700 carious teeth per 1000), then applying a resin-based sealant will reduce...... the proportion of the carious surfaces to 18.92% (95% CI 12.28% to 27.18%). This caries preventive effect was maintained at longer follow-up but both the quality and quantity of the evidence was reduced (e.g. at 48 to 54 months of follow-up OR 0.21, 95% CI 0.16 to 0.28, four trials (two studies at low risk...

  16. Dental age estimation in Japanese individuals combining permanent teeth and third molars.

    Science.gov (United States)

    Ramanan, Namratha; Thevissen, Patrick; Fleuws, Steffen; Willems, G

    2012-12-01

    The study aim was, firstly, to verify the Willems et al. model on a Japanese reference sample. Secondly to develop a Japanese reference model based on the Willems et al. method and to verify it. Thirdly to analyze the age prediction performance adding tooth development information of third molars to permanent teeth. Retrospectively 1877 panoramic radiographs were selected in the age range between 1 and 23 years (1248 children, 629 sub-adults). Dental development was registered applying Demirjian 's stages of the mandibular left permanent teeth in children and Köhler stages on the third molars. The children's data were, firstly, used to validate the Willems et al. model (developed a Belgian reference sample), secondly, split ino a training and a test sample. On the training sample a Japanese reference model was developed based on the Willems method. The developed model and the Willems et al; model were verified on the test sample. Regression analysis was used to detect the age prediction performance adding third molar scores to permanent tooth scores. The validated Willems et al. model provided a mean absolute error of 0.85 and 0.75 years in females and males, respectively. The mean absolute error in the verified Willems et al. and the developed Japanese reference model was 0.85, 0.77 and 0.79, 0.75 years in females and males, respectively. On average a negligible change in root mean square error values was detected adding third molar scores to permanent teeth scores. The Belgian sample could be used as a reference model to estimate the age of the Japanese individuals. Combining information from the third molars and permanent teeth was not providing clinically significant improvement of age predictions based on permanent teeth information alone.

  17. Bonding durability of dental sealants to deciduous and permanent teeth

    OpenAIRE

    MOURA, Sandra Kiss; Lemos,Letícia Vargas Freire Martins; Myszkovisk, Suellen; Provenzano, Maria Gisette Arias; Balducci,Ivan; Myaki, Silvio Issao [UNESP

    2014-01-01

    AIM: To evaluate the bonding durability of materials used as sealants on different dentitions. METHODS: Deciduous (D) and permanent (P) molars were divided into four groups (n=5) and sealed with Fluroshield (F) and OptiBond FL (FL). Blocks of composite resin were built, stored in distilled water (24 h/37 °C), sectioned into 0.8 mm2 and tested at tensile (0.5 mm/min) after 24 h and 6 months. The fractures were observed and classified into adhesive, cohesive or mixed types. The data were a...

  18. Unknown syndrome: peculiar face, severe hypodontia of permanent teeth, and precocious choroid calcifications.

    OpenAIRE

    Pallotta, R; Fusilli, P

    1998-01-01

    We describe a mother and her twin daughters affected with severe hypodontia of the permanent teeth, precocious calcification of the choroid plexus, and minor digital anomalies. The presence of inner telecanthus, broad and flattened nasal bridge, mild ocular proptosis, small nose with anteverted nostrils, and slight microretrognathia gives them an unusual appearance. All three affected persons are of normal intelligence.

  19. Torque ripple minimization in a doubly salient permanent magnet motors by skewing the rotor teeth

    Science.gov (United States)

    Sheth, N. K.; Sekharbabu, A. R. C.; Rajagopal, K. R.

    2006-09-01

    This paper presents the effects of skewing the rotor teeth on the performance of an 8/6 doubly salient permanent magnet motor using a simple method, which utilizes the results obtained from the 2-D FE analysis. The optimum skewing angle is obtained as 12-15° for the least ripple torque without much reduction in the back-emf.

  20. Permanent magnet machines with air gap windings and integrated teeth windings

    Energy Technology Data Exchange (ETDEWEB)

    Alatalo, M. [Chalmers Univ. of Technology, Goeteborg (Sweden). School of Electrical and Computer Engineering

    1996-06-01

    The Thesis deals with axial and radial flux permanent magnet machines with air gap windings and an integrated teeth winding. The aim is to develop a machine that produces a high torque per unit volume with as low losses as possible. The hypothesis is that an advanced three-phase winding, magnetized by a permanent magnet rotor should be better than other machine topologies. The finite element method is used to find favourable dimensions of the slotless winding, the integrated teeth winding and the permanent magnet rotor. Three machines were built and tested in order to verify calculations. It can be concluded that the analysis method shows good agreement with the calculated and the measured values of induced voltage and torque. The experiments showed that the slotless machine with NdFeB-magnets performs approximately like the slotted machine. A theoretical comparison of axial flux topology to radial flux topology showed that the torque production of the inner rotor radial flux machine is superior to that of the axial flux machine. An integrated teeth winding based on iron powder teeth glued to the winding was studied. The force density of a pole with integrated teeth is around three times the force density of a slotless pole. A direct drive wind power generator of 6.4 kW with integrated teeth can have the same power losses and magnet weight as a transversal flux machine. Compared to a standard induction machine the integrated teeth machine had approximately 2.5 times the power capacity of the induction machine with the same power losses and outer volume. 39 refs

  1. Distinctive genetic activity pattern of the human dental pulp between deciduous and permanent teeth.

    Directory of Open Access Journals (Sweden)

    Ji-Hee Kim

    Full Text Available Human deciduous and permanent teeth exhibit different developmental processes, morphologies, histological characteristics and life cycles. In addition, their pulp tissues react differently to external stimuli, such as the pulp sensitivity test, dental trauma and pulp therapy materials. These suggest differences in gene expression and regulation, and in this study we compared gene-expression profiles of the human dental pulp from deciduous and permanent teeth. Pulp tissues from permanent premolars and deciduous molars aged 11-14 years were extirpated and mRNA was isolated for cDNA microarray analysis, and quantitative real-time PCR (qPCR. Other teeth were used for immunohistochemical analysis (IHC. Microarray analysis identified 263 genes with a twofold or greater difference in expression level between the two types of pulp tissue, 43 and 220 of which were more abundant in deciduous and permanent pulp tissues, respectively. qPCR analysis was conducted for eight randomly selected genes, and the findings were consistent with the cDNA microarray results. IHC confirmed that insulin-like growth factor 2 mRNA-binding protein 1 (IGF2BP1 was broadly expressed in deciduous dental pulp tissue, but minimally expressed in permanent dental pulp tissue. Immunohistochemical analysis showed that calbindin 1 (CALB1, leucine-rich repeat-containing G-protein-coupled receptor 5 (LGR5, and gamma-aminobutyric acid A receptor beta 1 (GABRB1 were abundantly expressed in permanent predentin/odontoblasts, but only minimally expressed in deciduous dental pulp tissue. These results show that deciduous and permanent pulp tissues have different characteristics and gene expression, suggesting that they may have different functions and responses to therapies focused on pulp or dentin regeneration.

  2. Clinical and Radiographic Outcomes in Immature Permanent Necrotic Evaginated Teeth Treated with Regenerative Endodontic Procedures.

    Science.gov (United States)

    Li, Ling; Pan, Yihuai; Mei, Liqin; Li, Jun

    2017-02-01

    Regenerative endodontics is a promising alternative treatment for immature permanent teeth with necrotic dental pulp. The present study assessed the time to resolution of clinical symptoms and radiographic changes in root dimensions in immature permanent necrotic teeth with dens evaginatus. In this prospective study, clinical and radiographic data were collected for 20 teeth with dens evaginatus treated with a revascularization protocol for 1 year. Tooth survival and success rate were analyzed, and radiographic changes in the radiographic root area, apical diameter, and root length were quantified. All 20 treated teeth (100%) survived and met the clinical criteria for success throughout the study period. The within-case percent change in radiographic root area was 28.14% at 3 months and had increased to 97.58% at 12 months. The within-case percent change in apical diameter after 3 months was 21.40% and had increased to 72.90% by 12 months, with 40% (8 of 20) showing complete apical closure at 12 months. The within-case percent change in root length was 2.65% at 3 months and had increased to 23.37% at 12 months. In this study, revascularization allowed the continued development of roots in teeth with necrotic pulp as well as excellent overall survival and success rates. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  3. Longitudinal Cohort Study of Regenerative Endodontic Treatment for Immature Necrotic Permanent Teeth.

    Science.gov (United States)

    Chan, Edwin Ka Meng; Desmeules, Mia; Cielecki, Margaret; Dabbagh, Basma; Ferraz Dos Santos, Beatriz

    2017-03-01

    The treatment of immature necrotic permanent teeth presents several clinical challenges in endodontics. Regenerative endodontic procedures (REPs) permit root development, increased canal wall thickness, and apical closure. This longitudinal cohort study aimed to evaluate the long-term clinical and radiographic outcomes of REPs of immature necrotic permanent teeth over a 30-month period. This study was performed at the Division of Dentistry of the Montreal Children's Hospital, Montreal, Quebec, Canada. Twenty-eight immature necrotic permanent teeth from 22 patients were included in this study. All teeth were treated with a standardized REP protocol. Patients had follow-up appointments at 1, 2, 3, 6, 12, 18, 24, and 30 months. At each appointment, signs and symptoms were evaluated. Radiographic evaluation was also performed by a calibrated endodontist in order to analyze different parameters. Our results show a high survival rate (96.4%), clinical success (92.8%), and resolution of apical pathology (100%). Significant increases in the average root length (8.1%, P < .0001) and root thickness area (11.6%, P = .03) were observed after 30 months. In the study period, a significant decrease in the apical diameter was also noted, with 30.8% of the cases showing complete apical closure. Teeth with more immature stages of root development had a higher percentage of change in root thickness, length, and apical diameter; however, these results were not statistically significant. Teeth treated with REPs presented resolution of symptoms. Although clinical meaningful change was not achieved in all cases, increased root thickness, root length, and apical closure were observed at 30 months. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  4. Timing of fluoride intake and dental fluorosis on late-erupting permanent teeth.

    Science.gov (United States)

    Bhagavatula, Pradeep; Levy, Steven M; Broffitt, Barbara; Weber-Gasparoni, Karin; Warren, John J

    2016-02-01

    Very few studies have examined the relationship between timing of fluoride intake and development of dental fluorosis on late-erupting permanent teeth using period-specific fluoride intake information. This study examined this relationship using longitudinal fluoride intake information from the Iowa Fluoride Study. Participants' fluoride exposure and intake (birth to 10 years of age) from water, beverages, selected food products, dietary fluoride supplements, and fluoride toothpaste was collected using questionnaires sent to parents at 3- and 4- month intervals from birth to 48 months of age and every 6 months thereafter. Three trained and calibrated examiners used the Fluorosis Risk Index (FRI) categories to assess 16 late-erupting teeth among 465 study participants. A tooth was defined as having definitive fluorosis if any of the zones on that tooth had an FRI score of 2 or 3. Participants with questionable fluorosis were excluded from analyses. Descriptive and logistic regression analyses were performed to assess the importance of fluoride intake during different time periods. Most dental fluorosis in the study population was mild, with only four subjects (1%) having severe fluorosis (FRI Score 3). The overall prevalence of dental fluorosis was 27.8%. Logistic regression analyses showed that fluoride intake from each of the individual years from age 2 to 8 plays an important role in determining the risk of dental fluorosis for most late-erupting permanent teeth. The strongest association for fluorosis on the late-erupting permanent teeth was with fluoride intake during the sixth year of life. Late-erupting teeth may be susceptible to fluorosis for an extended period from about age 2 to 8. Although not as visually prominent as the maxillary central incisors, some of the late-erupting teeth are esthetically important and this should be taken into consideration when making recommendations about dosing of fluoride intake. © 2015 John Wiley & Sons A/S. Published by

  5. In vitro performance of a pen-type laser fluorescence device and bitewing radiographs for approximal caries detection in permanent and primary teeth

    Directory of Open Access Journals (Sweden)

    Juliana Feltrin de Souza

    2014-01-01

    Conclusion: LFpen presented better reproducibility for primary and permanent teeth and higher accuracy in detecting caries lesions at D1 threshold than BW for permanent teeth. LFpen should be used as an adjunct method for approximal caries detection.

  6. Time of mineralization of permanent teeth in children and adolescents in Gaborone, Botswana.

    Science.gov (United States)

    Cavrić, Jelena; Vodanović, Marin; Marušić, Ana; Galić, Ivan

    2016-01-01

    The mineralization sequence of permanent dentition can be used to assess the stage of development and age of individuals. The most commonly used methods are based on the assessment of developmental stages of target groups of teeth on one side of the lower jaw. When compared with the rest of the world, fewer studies have been done on dental age in Sub-Saharan Africa, particularly in the region of Southern Africa. The aim of this study was to determine the chronology of mineralization of permanent teeth by the evaluation of developmental stages according to the Demirjian's method from 1973 and to evaluate dental age by using sex-specific self-weighted scores for dental stages and 50th percentile conversion tables of total maturity scores of seven mandibular teeth. We used a sample of panoramic radiographs (OPTs) of black African children and adolescents from the city of Gaborone, Botswana, with the aim of forming an appropriate sample to evaluate the development of the teeth in this socio-geographic environment. The final sample consisted of 1760 OPTs (807 males and 953 females) of individuals aged 6-23 years. The developmental stages of the all permanent teeth in the left side of the maxilla and the mandible were evaluated. Comparing the maxilla and the mandible, we found similar development within different stages for most of the teeth. In comparison to the average age at each stage of development, including the third molars between males and females, it is evident that females are slightly faster in developing permanent teeth, but without statistical significance for most of the developmental stages. Applying 50th percentile conversion tables for calculating the dental age for the first seven mandibular teeth, 616 OPTs of the children (299 males and 317 females), aged 6.08-16.80 years, were evaluated and their dental age was calculated. Mean dental age was overestimated in comparison to chronological age by 1.25±1.11 years and 0.72±1.02 years for males and

  7. Analysis of 261 avulsed permanent teeth of patients treated in a dental urgency service

    OpenAIRE

    Orlando Aguirre Guedes; Álvaro Henrique Borges; Matheus Coelho Bandeca; Cyntia Rodrigues de Araújo Estrela; Ana Helena Gonçalves de Alencar; Carlos Estrela

    2015-01-01

    Objective: The aim of this study was to evaluate the epidemiological aspects and clinical factors associated with avulsion of permanent teeth. Materials and Methods: The sample consisted of 261 avulsed teeth of 170 patients seen in the Dental School of the Federal University of Goiαs, Brazil, from 2000 to 2008. Result: The highest incidence was found among boys (71.18%) aged 6-15 years (61.18%). The main etiologic factors were falls (51.76%) and traffic accidents (29.41%). Most cases occurred...

  8. Analysis of 261 avulsed permanent teeth of patients treated in a dental urgency service

    Directory of Open Access Journals (Sweden)

    Orlando Aguirre Guedes

    2015-01-01

    Full Text Available Objective: The aim of this study was to evaluate the epidemiological aspects and clinical factors associated with avulsion of permanent teeth. Materials and Methods: The sample consisted of 261 avulsed teeth of 170 patients seen in the Dental School of the Federal University of Goiαs, Brazil, from 2000 to 2008. Result: The highest incidence was found among boys (71.18% aged 6-15 years (61.18%. The main etiologic factors were falls (51.76% and traffic accidents (29.41%. Most cases occurred in autumn (March to June; 31.18% and winter (June to September; 27.65%. Most avulsed teeth were the maxillary central incisor (62.45%, followed by the maxillary lateral incisor (21.46%. A high proportion (67.23% of injured teeth had a completely formed root apex. Replantation was used to treat 119 teeth (45.59% in 86 patients. Most replantations were delayed (89.08%. Thirty-eight teeth (31.93% were stored in dry media. Periodontal healing was found in 41 teeth (34.45%, inflammatory root resorption, in 44 (36.97% and replacement root resorption, in 22 (18.49%. The most frequent treatments for replanted teeth were endodontic treatment and temporary filling of the root canal with calcium hydroxide (58.92% and endodontic treatment and definitive root canal filling (26.89%. Conclusion: The epidemiological and clinical aspects of tooth avulsion in this study were similar to those reported in other studies. The number of replantation was low, the number of teeth stored in non-physiological conditions was high, and replantation was often delayed.

  9. [Eruption times of permanent teeth in children and adolescents in the German state of Saarland].

    Science.gov (United States)

    Friedrich, Reinhard E; Leist, André; Scheuer, Hanna A

    2008-01-01

    The eruption times of permanent teeth and the sequence of tooth eruption were investigated in 1,856 individuals aged 4 to 24 years (female: 912, male: 944). Wisdom teeth were excluded from the evaluation. All individuals were inhabitants of the German state of Saarland. The results were compared to results of national and international studies on tooth eruption of the 20th century and studies published in recent years. The teeth emerged symmetrically in each jaw. However, teeth erupted earlier in the mandible than in the maxilla, excluding the slightly earlier eruption of maxillary premolars and first molars in males. The sequence of emerging teeth in the maxilla of females is: first molar, central incisor, lateral incisor, first premolar, canine, second premolar, and second molar. The sequence of tooth eruption of the mandible of females differs from the maxillary sequence: first molar, central incisor, lateral incisor, canine, first premolar, second premolar, second molar. The sequence of emerging teeth in the maxilla of males is: first molar, central incisor, lateral incisor, first premolar, second premolar, canine, and second molar. The sequence of tooth eruption of the mandible of males differs from the maxillary sequence: first molar, central incisor, lateral incisor, first premolar, canine, second premolar, second molar. The results of this study are in accordance with those from other current studies of German federal states, obtained by the same method.

  10. Dental trauma. Combination injuries 2. The risk of pulp necrosis in permanent teeth with subluxation injuries and concomitant crown fractures

    DEFF Research Database (Denmark)

    Lauridsen, Eva Fejerskov; Hermann, Nuno Vibe; Gerds, Thomas Alexander

    2012-01-01

    age, crown fracture type, mobility and response to an electric pulp test (EPT) at the initial examination. Results:  Teeth with immature root development: The risk of PN was increased in teeth with a concomitant enamel fracture (log-rank test: P = 0.002), enamel–dentin fracture (log-rank test: P ...The reported risk of pulp necrosis (PN) is generally low in teeth with subluxation injuries. A concomitant crown fracture may increase the risk of PN in such teeth. Aim:  To analyse the influence of a concomitant trauma-related infraction, enamel-, enamel–dentin- or enamel–dentin–pulp fracture...... on the risk of PN in permanent teeth with subluxation injury. Material and Methods:  The study included 404 permanent incisors with subluxation injury from 289 patients (188 male, 101 female). Of these teeth, 137 had also suffered a concomitant crown fracture. All the teeth were examined and treated according...

  11. Development of the permanent mandibular cheek teeth in fallow deer (Dama dama).

    Science.gov (United States)

    Kierdorf, H; Hommelsheim, S; Kierdorf, U

    2012-12-01

    The study describes crown and root formation of the permanent mandibular cheek teeth of fallow deer from a gestational age of 22-23 weeks up to a post-natal age of 33 months. Tooth development was recorded using a scoring scheme based on morphological criteria ranging from crypt formation to completion of root growth. The morphological appearance of the enamel surface during three different stages (secretory-stage enamel, maturation-stage enamel and mature enamel) was described, and the approximate age at termination of the secretory stage of amelogenesis in the deciduous and permanent mandibular cheek teeth was determined. The data enable an age estimation of fallow deer up to 3 years of age and provide a basis for assessing the timing of stress episodes that affect tooth crown formation. This information is useful for the management of the species as well as in bioarchaeological and bioindication studies.

  12. Effect of skewing the rotor teeth on the performance of doubly salient permanent magnet motors

    Science.gov (United States)

    Sheth, N. K.; Sekharbabu, A. R. C.; Rajagopal, K. R.

    2006-04-01

    This paper presents the effects of skewing the rotor teeth on the performance characteristics such as flux linkage, back emf, phase inductance, and reluctance torque of an 8/6 doubly salient permanent magnet motor using a simple method, which utilizes the results obtained from the two-dimensional finite element analysis. The optimum skewing angle is obtained as 12°-15° for the least ripple torque without much reduction in the back emf. Skewing the rotor teeth of an 8/6 doubly salient permanent magnet motor by 12°-15° will reduce the total harmonic distortion of the back emf profile to 29.69% from the original value of 44.69%. The reduction in the amplitude of the back emf in this case will be 18.79% only.

  13. Resin composite or ceramic inlays/onlays in posterior permanent teeth : a review of the literature

    OpenAIRE

    Breistrand, Joakim Lund; Juliussen, Øyvind

    2011-01-01

    Objective: To compare the clinical survival and long-term costs of extensive composite restorations to ceramic inlays and onlays. The hypothesis was that ceramic inlays and onlays can be more tooth substance saving and long-term economic for the patient than composite restorations. Methods: The dental literature, predominantly since 1990, was reviewed for prospective clinical studies of longevity of ceramic inlays/onlays and direct composite restorations in permanent posterior teeth. Only ...

  14. New electronic apex locator Romiapex A-15 presented accuracy for working length determination in permanent teeth

    Directory of Open Access Journals (Sweden)

    Etevaldo Matos Maia Filho

    2014-12-01

    Full Text Available Purpose: The present study aims to evaluate, ex vivo, the accuracy of electronic apex locators Root ZX II and Romiapex-15, for working length (WL determination in permanent teeth. Materials and Methods: Fourteen single-rooted teeth (incisors and canines, with their apices fully formed were used. The dental crowns were removed. The anatomic length of the tooth (real measurement was visually determined through the insertion of a size 10 K-file until the tip of the instrument could be observed in the apical foramen under a microscope (20X. Teeth were fixed in a model of resin and adapted into alginate soaked with saline solution, which was used as an  electrical conductor. Using a K-file, root canals were measured electronically using both devices. The results obtained for each apex locator were compared to the real measurements. The accuracy between the devices was statistically analyzed using the Bland-Altman graph, Intraclass Correlation Coefficient (ICC, and Student’s t-test. Results: The mean difference between the measurements using the Root ZX II was 0.277mm greater than the real measurement, while the measurements from the Romiapex-15 were 0.308mm higher on average. The comparison between Root ZX II and Romiapex-15 had no significant difference (p= 0.868. Conclusion: It was concluded that Root ZX II and Romiapex-15 had similar accuracy. Romiapex-15 could be an option for WL determination in permanent teeth.

  15. Miniature Pulpotomy of Symptomatic Mature Permanent Teeth: A Report of Two Cases

    Science.gov (United States)

    Asgary, Saeed; Nourzadeh, Mahdieh; Eghbal, Mohammad Jafar

    2016-01-01

    Human dental pulp inflammation can progress to periapical lesion formation and conventional root canal treatment (RCT) has been the traditional method for disease management. This observational study presents two cases of vital pulp therapy in mature molars diagnosed with irreversible pulpitis and associated with apical periodontitis. In these two clinical cases, the involved teeth had deep carious lesions with a history of spontaneous/lingering pain and radiographic examinations revealed the presence of apical radiolucencies. A conservative miniature pulpotomy (MP) using calcium-enriched mixture (CEM) was performed and the teeth were permanently restored with amalgam. Clinical evaluations indicated resolution of pain 24 hours after treatment; the teeth showed normal vitality, remained asymptomatic and maintained normal function after recall examinations. Furthermore, the 18-month radiographic evaluation showed healing of the apical lesions. Vital pulp therapy using the MP technique with CEM appeared successful in avoiding RCT intervention. These two reports of case outcome suggest that simple MP using a CEM bioregenerative technique may provide a favorable outcome for permanent teeth diagnosed with irreversible pulpitis and associated with apical periodontitis. PMID:26843883

  16. Root maturation and dentin-pulp response to enamel matrix derivative in pulpotomized permanent teeth.

    Science.gov (United States)

    Darwish, Sherif S; Abd El Meguid, Shadia H; Wahba, Nadia A; Mohamed, Ahmed A-R; Chrzanowski, Wojciech; Abou Neel, Ensanya A

    2014-01-01

    The success of pulpotomy of young permanent teeth depends on the proper selection of dressing materials. This study aimed to evaluate the histological and histomorphometric response of dentin-pulp complex to the enamel matrix derivative (Emdogain(®) gel) compared to that of calcium hydroxide when used as a pulp dressing in immature young permanent dogs' teeth. Dentin-like tissues bridging the full width of the coronal pulp at the interface between the injured and healthy pulp tissues were seen after 1 month in both groups. With time, the dentin bridge increased in thickness for calcium hydroxide but disintegrated and fully disappeared for Emdogain-treated group. Progressive inflammation and total pulp degeneration were only evident with Emdogain-treated group. The root apices of Emdogain-treated teeth became matured and closed by cementum that attached to new alveolar bone by a well-oriented periodontal ligament. In young permanent dentition, Emdogain could be a good candidate for periodontium but not dentino-pulpal complex regeneration.

  17. Root maturation and dentin–pulp response to enamel matrix derivative in pulpotomized permanent teeth

    Directory of Open Access Journals (Sweden)

    Sherif S Darwish

    2014-01-01

    Full Text Available The success of pulpotomy of young permanent teeth depends on the proper selection of dressing materials. This study aimed to evaluate the histological and histomorphometric response of dentin–pulp complex to the enamel matrix derivative (Emdogain® gel compared to that of calcium hydroxide when used as a pulp dressing in immature young permanent dogs’ teeth. Dentin-like tissues bridging the full width of the coronal pulp at the interface between the injured and healthy pulp tissues were seen after 1 month in both groups. With time, the dentin bridge increased in thickness for calcium hydroxide but disintegrated and fully disappeared for Emdogain-treated group. Progressive inflammation and total pulp degeneration were only evident with Emdogain-treated group. The root apices of Emdogain-treated teeth became matured and closed by cementum that attached to new alveolar bone by a well-oriented periodontal ligament. In young permanent dentition, Emdogain could be a good candidate for periodontium but not dentino–pulpal complex regeneration.

  18. Marginal adaptation and performance of bioactive dental restorative materials in deciduous and young permanent teeth

    Directory of Open Access Journals (Sweden)

    Elizabeta Gjorgievska

    2008-02-01

    Full Text Available OBJECTIVE: The aim of this study was to investigate the adaptation of different types of restorations towards deciduous and young permanent teeth. MATERIAL AND METHODS: Class V cavities were prepared in deciduous and young permanent teeth and filled with different materials (a conventional glass-ionomer, a resin-modified glass-ionomer, a poly-acid-modified composite resin and a conventional composite resin. Specimens were aged in artificial saliva for 1, 6, 12 and 18 months, then examined by SEM. RESULTS: The composite resin and the polyacid-modified composite had better marginal adaptation than the glass-ionomers, though microcracks developed in the enamel of the tooth. The glass-ionomers showed inferior marginal quality and durability, but no microcracking of the enamel. The margins of the resin-modified glass-ionomer were slightly superior to the conventional glass-ionomer. Conditioning improved the adaptation of the composite resin, but the type of tooth made little or no difference to the performance of the restorative material. All materials were associated with the formation of crystals in the gaps between the filling and the tooth; the quantity and shape of these crystals varied with the material. CONCLUSIONS: Resin-based materials are generally better at forming sound, durable margins in deciduous and young permanent teeth than cements, but are associated with microcracks in the enamel. All fluoride-releasing materials give rise to crystalline deposits.

  19. Establishment of sexual dimorphism in north indian population by odontometric study of permanent maxillary canine teeth

    Directory of Open Access Journals (Sweden)

    Shalini Gupta

    2014-01-01

    Full Text Available Aim: To investigate whether sexual dimorphism can be established by odontometric study of permanent maxillary canine teeth as well as inter-canine width in north Indian population. Study Design: The study was carried out at department of oral and maxillofacial pathology, King George′s Medical University, Lucknow, India on students and patients reporting at OPD. Out of total 180 subjects examined 90 subjects were female and 90 were male. Impressions of the upper arch were made using alginate and casts poured in dental stone. The mesiodistal diameter (MD of the crown of permanent maxillary canine both on right and left sides and inter-canine width were measured. From these measurements, maxillary canine index was calculated. The percentage of sexual dimorphism (SD was assessed for all the parameters. Results: In the present study, the MD of maxillary canine for both right (P = 0.001 and left side (P = 0.005 was significantly higher among male subjects than females, Similar observation was found for inter-canine width too (P = 0.0001. However, the maxillary canine index for right and left was almost similar (P > 0.05 for both male and female subjects. The SD in right and left MDs of maxillary canine was 4.2% and 3.6% respectively. For, inter-canine width it was maximum (13.7%. However, SD in right and left canine index showed negative values (−2.1% and -0.9% respectively. Conclusion: There was SD in MD and inter-canine width of permanent maxillary canine teeth. SD was more on right permanent maxillary canine teeth than left permanent maxillary canine.

  20. Contribution of prosthetic treatment considerations for dental extractions of permanent teeth.

    Science.gov (United States)

    Fernández-Barrera, Miguel Ángel; Medina-Solís, Carlo Eduardo; Casanova-Rosado, Juan Fernando; Mendoza-Rodríguez, Martha; Escoffié-Ramírez, Mauricio; Casanova-Rosado, Alejandro José; Navarrete-Hernández, José de Jesús; Maupomé, Gerardo

    2016-01-01

    Background. Tooth loss is an easily identifiable outcome that summarizes a complex suite of factors in an individual's history of dental disease and its treatment by dental services over a lifetime. Assessment of overall tooth loss data is essential for epidemiologically evaluating the adequacy of dental care provided at a systems level, as well as for placing in context tooth loss for non-disease causes. For example, when derived from prosthetic treatment planning, the latter may unfortunately lead to some teeth being extracted (pulled) for the sake of better comprehensive clinical results. The objective of the present manuscript was to identify the contribution to overall tooth loss, by extraction of permanent teeth because of prosthetic treatment reasons. Material and Methods. A cross-sectional study included sex, age, total number of extractions performed by subject, sextant (anterior vs. posterior), group of teeth (incisors, canines, premolars and molars), upper or lower arch, and the main reason underlying extraction (extraction for any reason vs. prosthetic treatment), in patients 18 years of age and older seeking care at a dental school clinic in Mexico. A multivariate logistic regression model was generated. Results. A total of 749 teeth were extracted in 331 patients; 161 teeth (21.5% of total) were extracted for explicit prosthetic treatment indications. As age increased, the likelihood of having an extraction for prosthetic reasons increased 3% (OR = 1.03, p dental school clinical environment; age, sex, type of tooth, and the total number of extractions moderated such pattern.

  1. Comparison of the microhardness of primary and permanent teeth after immersion in two types of carbonated beverages.

    Science.gov (United States)

    Haghgou, Hamid R; Haghgoo, Roza; Asdollah, Fatemah Molla

    2016-01-01

    The consumption of carbonated beverages is one of the etiological factors that cause dental erosion. The purpose of this research was to compare changes in the microhardness of permanent and primary teeth after immersion in two types of carbonated beverages. This investigation was done on 30 healthy permanent molars and 30 healthy primary canines. Each group of primary and permanent teeth was subdivided into three groups of 10 teeth. The teeth was immersed in 40 ml of each of the three beverages for 5 min. One subgroup was immersed in water (as a control). The next was immersed in Lemon Delster and the last subgroup was immersed in Coca-Cola. The microhardness of enamel was measured using the Vickers method before and after immersion. Finally, the data was analyzed by paired t-test, one-way analysis of variance, and t-test. Microhardness reduction in the primary teeth was significant in both the Lemon Delster and Coca-Cola groups (P beverages showed a greater microhardness reduction in the primary teeth in both the experimental groups. Coca-Cola and Lemon Delster caused a significant reduction of microhardness in tooth enamel. This reduction was greater in primary teeth than in permanent teeth, and was also greater after immersion in Coca-Cola than after immersion in Lemon Delster.

  2. Orthodontic Management with Traction and Asymmetric Extraction for Multiple Impacted Permanent Maxillary Teeth – A Case Report

    Science.gov (United States)

    Niu, Qiannan; Zhang, Liang; Dai, Juan; Li, Feifei; Feng, Xue

    2016-01-01

    Multiple impacted teeth are a rare eruption disturbance that increases the case complexity. In this article, we described a 13-year-old boy whose 5 permanent maxillary teeth were not erupted although their root formation was complete. The orthodontic treatment with traction and asymmetric extraction was performed to achieve a significantly improved functional and esthetic result. PMID:27857816

  3. A randomized controlled trial of various MTA materials for partial pulpotomy in permanent teeth.

    Science.gov (United States)

    Kang, Chung-Min; Sun, Yeji; Song, Je Seon; Pang, Nan-Sim; Roh, Byoung-Duck; Lee, Chan-Young; Shin, Yooseok

    2017-05-01

    The aim of this study was to evaluate and compare the clinical applicability of various MTA materials as partial pulpotomy materials in permanent teeth. Partial pulpotomy was performed on 104 permanent teeth from 82 people (mean 29.3±14.8years old), who met the inclusion criteria in randomized clinical trial. The teeth were divided into three groups: ProRoot MTA (n=33), OrthoMTA (n=36), RetroMTA (n=35). Clinical examination and radiographic comparison were carried out at 1, 3, 6 and 12 months after the treatment. Survival analysis was performed using the Kaplan-Meier survival curves and log rank tests. Partial pulpotomy sustained a high success rate up to 1year with no significant differences in the outcomes treated with three MTA materials: ProRoot MTA, 96.0%; OrthoMTA, 92.8%; RetroMTA, 96.0%. The Kaplan-Meier survival function curves showed no significant differences among three groups concerning clinical and radiographic cumulative survival rates. In addition, no potential prognostic factors related to the success rate of partial pulpotomy among age, sex, tooth type, root apex status, the site and type of pulp exposure, and the type of restoration were observed in log rank analysis. Partial pulpotomy with ProRoot MTA, OrthoMTA and RetroMTA had favorable results and clinical and radiographic results were not significantly different in three groups after 1year. Copyright © 2016 Elsevier Ltd. All rights reserved.

  4. Regenerative potential of immature permanent teeth with necrotic pulps after different regenerative protocols.

    Science.gov (United States)

    Nagy, Mohamed M; Tawfik, Hosam E; Hashem, Ahmed Abdel Rahman; Abu-Seida, Ashraf M

    2014-02-01

    Regenerative endodontics is a promising alternative treatment for immature teeth with necrotic pulps. The present study was performed to assess the regenerative potential of young permanent immature teeth with necrotic pulp after the following treatment protocols: (1) a mineral trioxide aggregate (MTA) apical plug, (2) the regenerative endodontic protocol (blood clot scaffold), and (3) the regenerative endodontic protocol with a blood clot and an injectable scaffold impregnated with basic fibroblast growth factor. Immature necrotic permanent maxillary central incisors (n = 36) of patients 9-13 years old were divided into 3 groups according to the treatment protocol: the MTA group (MTA apical plug), the REG group (regenerative endodontic protocol [blood clot]), and the FGF group (regenerative endodontic protocol [blood clot + injectable scaffold]). Follow-up was done up to 18 months. Standardized radiographs were digitally evaluated for an increase in root length and thickness, a decrease in the apical diameter, and a change in periapical bone density. After a follow-up period of 18 months, most of the cases showed radiographic evidence of periapical healing. Groups 2 and 3 showed a progressive increase in root length and width and a decrease in apical diameter. The regenerative endodontic procedure allowed the continued development of roots in teeth with necrotic pulps. The use of artificial hydrogel scaffold and basic fibroblast growth factor was not essential for repair. Copyright © 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  5. Genome-wide association study identifies four loci associated with eruption of permanent teeth.

    Directory of Open Access Journals (Sweden)

    Frank Geller

    2011-09-01

    Full Text Available The sequence and timing of permanent tooth eruption is thought to be highly heritable and can have important implications for the risk of malocclusion, crowding, and periodontal disease. We conducted a genome-wide association study of number of permanent teeth erupted between age 6 and 14 years, analyzed as age-adjusted standard deviation score averaged over multiple time points, based on childhood records for 5,104 women from the Danish National Birth Cohort. Four loci showed association at P<5×10(-8 and were replicated in four independent study groups from the United States and Denmark with a total of 3,762 individuals; all combined P-values were below 10(-11. Two loci agreed with previous findings in primary tooth eruption and were also known to influence height and breast cancer, respectively. The two other loci pointed to genomic regions without any previous significant genome-wide association study results. The intronic SNP rs7924176 in ADK could be linked to gene expression in monocytes. The combined effect of the four genetic variants was most pronounced between age 10 and 12 years, where children with 6 to 8 delayed tooth eruption alleles had on average 3.5 (95% confidence interval: 2.9-4.1 fewer permanent teeth than children with 0 or 1 of these alleles.

  6. Allogeneic stem cells derived from human exfoliated deciduous teeth (SHED for the management of periapical lesions in permanent teeth: Two case reports of a novel biologic alternative treatment

    Directory of Open Access Journals (Sweden)

    Madu Ghana Shyam Prasad

    2017-06-01

    Full Text Available Stem cells are the pluripotent cells that have the capacity to differentiate into other specialized cells. Recently, many experiments have been conducted to study the potentiality of stem cells in the tissue regeneration. We report two cases treated utilizing stem cells from human exfoliated deciduous teeth (SHED in the management of periapical lesions in permanent teeth. Two normal human deciduous teeth from children, 7‒8 years of age, were collected to isolate stem cells. Two patients, one with periapical pathology alone and the other with periapical lesion along with an open apex in young permanent teeth, were selected for the study. After initial debridement of the root canals, homing of SHED was carried out and the access cavity was sealed using glass-ionomer cement. Clinical examination after 7 days, 30 days, 90 days, 180 days and 365 days revealed no symptoms. Closure of open apex and periapical tissue healing were observed radiographically at one-month review and maintained until 365-day review. Positive response to electric pulp testing was recorded for the treated teeth from the 3- to 12-month follow-ups. The treated cases demonstrated complete resolution of periapical radiolucency in a span of 30 days, which was faster than the conventional methods. SHED could be considred effective in treating the periapical lesions and open apex in permanent teeth.

  7. Premature loss of primary teeth: part I, its overall effect on occlusion and space in the permanent dentition.

    Science.gov (United States)

    Hoffding, J; Kisling, E

    1978-01-01

    Premature loss of primary molars causes, without doubt, permanent changes in regard to space and sagittal molar relations, in the permanent dentition. The changes are due to drifting of teeth and lack of growth, and such changes should, whenever possible, be prevented. In part two of this series of papers, a further analysis of the data will be presented.

  8. Effect of needle insertion depth and apical diameter on irrigant extrusion in simulated immature permanent teeth

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    AKSEL Hacer

    2014-09-01

    Full Text Available The aim of this study was to compare the amount of irrigant extrusion in simulated immature permanent teeth when the apical diameter and needle insertion depth were varied. Thirty single-rooted maxillary incisors with straight root canals were selected. The root length was standardized to a length of 9 mm. The teeth were divided into two experimental groups according to the degree of apical enlargement (n = 15. The apices were enlarged to a diameter of 1.10 mm or 1.70 mm by using a #3 or #6 peeso reamer, respectively, to simulate immature teeth. The irrigation solution was applied 2 or 4 mm short of the working length (WL in each experimental group. The glass vial model was used for the collection of extruded irrigant beyond the root apex. A two-way repeated measures analysis of variance test showed that there was no significant difference between different needle insertion depths (2 and 4 mm short of the WL in the group with an apical diameter of 1.70 mm (p > 0.05. In the group with an apical diameter of 1.10 mm, a 32% increase in irrigant extrusion was observed when the needle was positioned at 2 mm (p < 0.05. Regarding the effect of apical diameter, the group with a diameter of 1.70 mm showed more apical extrusion of the irrigant (34% increase for the needle positioned at 2 mm and 68% increase for the needle positioned at 4 mm. It was observed that the needle insertion depth and apical diameter have a significant effect on irrigant extrusion in immature permanent teeth.

  9. Preliminary study on dental pulp stem cell-mediated pulp regeneration in canine immature permanent teeth.

    Science.gov (United States)

    Wang, Yuanyuan; Zhao, Yuming; Jia, Weiqian; Yang, Jie; Ge, Lihong

    2013-02-01

    The health of human teeth depends on the integrity of the hard tissue and the activity of the pulp and periodontal tissues, which are responsible for nutritional supply. Without the nourishing of the pulp tissue, the possibility of tooth fracture can increase. In immature permanent teeth, root development may be influenced as well. This study explored the potential of using autologous dental pulp stem cells (DPSCs) to achieve pulp regeneration in a canine pulpless model. The establishment of the pulpless animal model involved pulp extirpation and root canal preparation of young permanent incisor teeth in beagles. Autologous DPSCs were obtained from extracted first molars and expanded ex vivo to obtain a larger number of cells. The biological characteristics of canine DPSCs (cDPSCs) were analyzed both in vitro and in vivo by using the same method as used in human DPSCs. cDPSCs were transplanted into the pulpless root canal with Gelfoam as the scaffold, and root development was evaluated by radiographic and histologic analyses. cDPSCs with rapid proliferation, multiple differentiation capacity, and development potential were successfully isolated and identified both in vitro and in vivo. After they were transplanted into the pulpless root canal with Gelfoam as the scaffold, DPSCs were capable of generating pulp-like tissues containing blood vessels and dentin-like tissue. Thickening of the root canal wall was also observed. This study demonstrates the feasibility of using stem cell-mediated tissue engineering to realize pulp regeneration in immature teeth. Copyright © 2013 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  10. Assessment of enamel roughness of bovine teeth bleached with and without laser activation

    OpenAIRE

    Rafael Canzi Almada de Paula XAVIER; Rodrigo Mario Pontoni MIRANDA; Gonzaga, Carla Castiglia; Maria da Graça Kfouri LOPES

    2009-01-01

    Introduction: Currently, due to increased demand of patients anddentists for aesthetic treatments, bleaching procedures have becomeroutine in dental treatment. The development of new techniques andmaterials, such as laser-activated bleaching, has gained popularity.However, due to the small number of publications in this area, theiraggressiveness to the enamel is still not known. Objective: To determine the roughness of the enamel surface of bovine teeth bleached with and without laser activat...

  11. Contribution of prosthetic treatment considerations for dental extractions of permanent teeth

    Directory of Open Access Journals (Sweden)

    Miguel Ángel Fernández-Barrera

    2016-07-01

    Full Text Available Background. Tooth loss is an easily identifiable outcome that summarizes a complex suite of factors in an individual’s history of dental disease and its treatment by dental services over a lifetime. Assessment of overall tooth loss data is essential for epidemiologically evaluating the adequacy of dental care provided at a systems level, as well as for placing in context tooth loss for non-disease causes. For example, when derived from prosthetic treatment planning, the latter may unfortunately lead to some teeth being extracted (pulled for the sake of better comprehensive clinical results. The objective of the present manuscript was to identify the contribution to overall tooth loss, by extraction of permanent teeth because of prosthetic treatment reasons. Material and Methods. A cross-sectional study included sex, age, total number of extractions performed by subject, sextant (anterior vs. posterior, group of teeth (incisors, canines, premolars and molars, upper or lower arch, and the main reason underlying extraction (extraction for any reason vs. prosthetic treatment, in patients 18 years of age and older seeking care at a dental school clinic in Mexico. A multivariate logistic regression model was generated. Results. A total of 749 teeth were extracted in 331 patients; 161 teeth (21.5% of total were extracted for explicit prosthetic treatment indications. As age increased, the likelihood of having an extraction for prosthetic reasons increased 3% (OR = 1.03, p < 0.001. Women (OR = 1.57, p < 0.05 were more likely to be in this situation, and molars (OR = 2.70, p < 0.001 were most at risk. As the total number of extractions increased, the risk of having an extraction for prosthetic reasons decreased (OR = 0.94, p < 0.05. Conclusions. A significant amount (21.5% of the extractions of permanent teeth were performed for prosthetic reasons in this dental school clinical environment; age, sex, type of tooth, and the total number of extractions

  12. Management of Delayed Eruption of Permanent Maxillary Incisor associated with the Presence of Supernumerary Teeth: A Case Report

    Science.gov (United States)

    Nagpal, Rajni; Singh, Mousumi; Chaudhary, Seema

    2011-01-01

    A supernumerary tooth is one that is additional to the normal series and can be found in almost any region of the dental arch. Clinically, supernumerary teeth are able to cause different local disorders. It is important for the dentist to be aware of the clinical complications of supernumerary teeth, the most common being the delayed eruption of permanent teeth. Early diagnosis and management of supernumerary teeth is important to prevent the need for more complex surgical and orthodontic treatment. This case report highlights the problem of delayed eruption of permanent maxillary left central incisor in a 9-year-old boy due to two supernumerary teeth, one tuberculate type and other impacted inverted mesiodens. PMID:27678238

  13. Treatment of Mature Permanent Teeth with Necrotic Pulps and Apical Periodontitis Using Regenerative Endodontic Procedures: A Case Series.

    Science.gov (United States)

    Saoud, Tarek Mohamed; Martin, Gabriela; Chen, Yea-Huey M; Chen, Kuang-Liang; Chen, Chao-An; Songtrakul, Kamolthip; Malek, Matthew; Sigurdsson, Asgeir; Lin, Louis M

    2016-01-01

    Regenerative endodontic procedures (REPs) are usually used to treat human immature permanent teeth with necrotic pulps and/or apical periodontitis. Successful REPs result in the elimination of clinical signs/symptoms, the resolution of apical periodontitis, and, in some cases, thickening of the canal walls and/or continued root development with or without apical closure. REPs can restore the vitality of tissue in the canals of immature permanent teeth previously destroyed by infection or trauma. Vital tissue is inherited with immune defense mechanisms to protect itself from foreign invaders. Recently, REPs have also been used to successfully treat human mature permanent teeth with necrotic pulps and apical periodontitis. The purpose of this case series was to present the potential of using REPs for mature permanent teeth with necrotic pulps and apical periodontitis. This case series consisted of 6 patients, 4 females and 2 males. The patients' ages ranged from 8-21 years old. Seven permanent teeth, 4 anterior and 3 molar teeth, with necrotic pulps and apical periodontitis were treated using REP. Radiographically, the root development of all teeth was almost completed except the apices of 2 molars, which showed slightly open. Complete chemomechanical debridement of the canals of the teeth was performed, and the canals were dressed with Metapaste (Meta Biomed Co, Ltd, Chungbuk, Korea) during treatment visits. Periapical bleeding into the canals was induced at the last treatment visit by placing a hand #20 or #25 K-file with the tip slightly bent through the apical foramina into the periapical tissues. A 3-mm thickness of mineral trioxide aggregate was placed into the coronal canals over semicoagulated blood. The access cavities were restored with either composite resin or amalgam. Follow-ups of the 7 teeth ranged from 8 to 26 months. The periapical lesions of 2 teeth were considered healed, and 5 teeth revealed healing. Clinical signs/symptoms were absent in all

  14. Influence of Different Rotor Teeth Shapes on the Performance of Flux Switching Permanent Magnet Machines Used for Electric Vehicles

    Directory of Open Access Journals (Sweden)

    Jing Zhao

    2014-12-01

    Full Text Available This paper investigated a 12-slot/11-pole flux switching permanent magnet (FSPM machine used for electric vehicles (EVs. Five novel rotor teeth shapes are proposed and researched to reduce the cogging torque and torque ripple of the FSPM machine. These rotor teeth shapes are notched teeth, stepped teeth, eccentric teeth, combination of notched and stepped teeth, and combination of notched and eccentric teeth. They are applied on the rotor and optimized, respectively. The influences of different rotor teeth shapes on cogging torque, torque ripple and electromagnetic torque are analyzed by the 2-D finite-element method (FEM. Then, the performance of FSPMs with different rotor teeth shapes are compared and evaluated comprehensively from the points of view of cogging torque, torque ripple, electromagnetic torque, flux linkage, back electromotive force (EMF, and so on. The results show that the presented rotor teeth shapes, especially the combination of stepped and notched teeth, can greatly reduce the cogging torque and torque ripple with only slight changes in the average electromagnetic torque.

  15. Root length in the permanent teeth of women with an additional X chromosome (47,XXX females).

    Science.gov (United States)

    Lähdesmäki, Raija E; Alvesalo, Lassi J

    2010-07-01

    Previous studies have demonstrated differential effects of the X and Y chromosomes on dental development. The expression of sexual dimorphism in terms of tooth size, shape, number and developmental timing has been explained especially by Y chromosome influence. The Y chromosome promotes enamel, crown and root dentin development. The X chromosome has an effect on enamel deposition. The aim of this research is to study the influence of the extra X chromosome on the development of permanent tooth root length. The study subjects (all of whom were from the Kvantti Dental Research Project) were seven 47,XXX females, five female relatives and 51 and 52 population control men and women, respectively. Measurements were made from panoramic radiographs on available permanent teeth by a digital calliper according to established procedures. The results showed that the maxillary root lengths of the 47,XXX females were of the same magnitude as those in normal women, but the mandibular root lengths were longer in 47,XXX females than in normal men or women. Increased enamel thickness in the teeth of 47,XXX females is apparently caused by the active enamel gene in all X chromosomes having no increased influence on crown dentin formation. These results in 47,XXX females indicate an increase in root dentin development, at least in the mandible, which together with the data on crown formation reflects a continuous long-lasting effect of the X chromosome on dental development.

  16. Pulp Revascularization on Permanent Teeth with Open Apices in a Middle-aged Patient.

    Science.gov (United States)

    Wang, Yu; Zhu, Xiaofei; Zhang, Chengfei

    2015-09-01

    Pulp revascularization is a promising procedure for the treatment of adolescents' immature permanent teeth with necrotic pulp and/or apical periodontitis. However, the ability to successfully perform pulp revascularization in a middle-aged patient remains unclear. A 39-year-old woman was referred for treatment of teeth #20 and #29 with necrotic pulp, extensive periapical radiolucencies, and incomplete apices. Pulp revascularization procedures were attempted, including root canal debridement, triple antibiotic paste medication, and platelet-rich plasma transplantation to act as a scaffold. Periapical radiographic and cone-beam computed tomographic examinations were used to review the changes in the apical lesions and root apex configuration. The patient remained asymptomatic throughout the 30-month follow-up. Periapical radiographic examination revealed no change in the apical lesions of either tooth at 8 months. The periapical radiolucency disappeared on tooth #20 and significantly decreased on tooth #29 by the 30-month follow-up, findings that were also confirmed by cone-beam computed tomographic imaging. No evidence of root lengthening or thickening was observed. Successful revascularization was achieved in a middle-aged patient's teeth.

  17. Vertical root fracture resistance of simulated immature permanent teeth filled with MTA using different vehicles

    Science.gov (United States)

    Askerbeyli-Örs, Sevinc; Deniz-Sungur, Derya

    2017-01-01

    Background The aim of the study is to evaluate the resistance vertical root fracture (VRF) of mineral trioxide aggregate (MTA) filled-immature permanent roots by using three different vehicles. Material and Methods Forty-extracted human single-rooted mandibular premolars were selected and the root length was standardized to the length of 9 mm. For simulation of immature tooth apices, peeso reamers were introduced into the root canals and the prepared roots were assigned into three experimental groups according the used vehicle (distilled water-DW, prophylene glycol-PG, chlorhexidine-CHX) and control group (n=10). To simulate a periodontal membrane, the apical 7 mm of all roots was covered with wax to obtain a 0.2- to 0.3-mm-thick layer before embedding the roots into acrylic cylinders. A vertical force was applied (1mm/min) using a universal testing machine and the maximum load (F-max) that fracture occurred and the fracture mode (splint or comminuted) was recorded. Data were presented as mean and standard deviations. Statistical analysis was performed using Kruskal-Wallis, Mann-Whitney U Test was used for multiple comparisons. Results There were significant differences between fracture strength of experimental groups with that of control group (p0.05). In all groups, split fracture was the most common fracture mode. Conclusions MTA increases resistance of immature permanent teeth to VRF. Based on the results of this study, it can be concluded that mixing MTA with CHX or PG as the vehicle do not alter VRF resistance of simulated immature permanent roots. Key words:Immature teeth, MTA, vehicle, vertical root fracture. PMID:28210431

  18. Disinfection Efficacy of Current Regenerative Endodontic Protocols in Simulated Necrotic Immature Permanent Teeth.

    Science.gov (United States)

    Latham, Jason; Fong, Hanson; Jewett, Anahid; Johnson, James D; Paranjpe, Avina

    2016-08-01

    The lack of mechanical debridement and reduced concentrations suggested for chemical debridement to maintain stem cell viability call into question the disinfection efficacy of current regenerative protocols. Current protocols vary in the concentration and type of antibiotic medicaments used. The aim of this study was to determine if simulated immature teeth infected with Enterococcus faecalis can be completely disinfected by following current standardized regenerative protocols and to evaluate the probable effects of residual bacteria on stem cell toxicity. Sixty-eight caries-free maxillary incisors were used. S1 sampling protocols were validated in both negative and positive control groups via culture, scanning electron microscopy, and confocal laser scanning microscopy. All teeth, except the negative controls, were inoculated with E. faecalis. The teeth were divided into the following groups: group 1, triple antibiotic paste (ciprofloxacin:metronidazole:minocycline) at concentrations of 10, 1, and 0.1 mg/mL; group 2, double antibiotic paste (ciprofloxacin:metronidazole) at concentrations of 10, 1, and 0.1 mg/mL; group 3: Ultracal XS calcium hydroxide (Ultradent, St Louis, MO); and controls, negative and positive controls. Current regenerative protocols recommended by the American Association of Endodontists were followed. S2 sampling was performed after 4 weeks and tested for bacterial presence via culturing, scanning electron microscopy, and confocal laser scanning microscopic analysis. The data showed that calcium hydroxide and the current recommended antibiotic concentrations are not capable of completely eliminating bacteria from simulated necrotic immature permanent teeth. Overall, this study focuses on the need to re-evaluate the balance between stem cell toxicity and bacterial elimination in order to determine the appropriate concentrations and medicaments for successful regenerative endodontic procedures. Published by Elsevier Inc.

  19. [Effect of Oravive gel on enamel remineralization and anti-demineralization of young permanent teeth treated by sugar drink].

    Science.gov (United States)

    Wang, Yu; Gong, Ling; Ji, Yan

    2012-12-01

    To evaluate the effect of Oravive gel and fluor protectors on remineralization and the capacity of resisting sugar drink erosion. The changes of surface microhardness (SMH) of young permanent teeth treated by Oravive gel or fluor protectors which were immersed in sugar drink in advance were measured. The morphological changes of surface were observed by scanning electron microscope (SEM). The SMH values of the young permanent teeth immersed in sugar drink and then treated with Oravive gel or fluor protectors increased significantly, and the Oravive group was stronger than fluor protectors group (P gel or fluor protectors and then immersed in sugar drink, the SHM value of Oravive group was significantly higher than fluor protectors group (P gel or fluor protectors treatment. Oravive gel may enhance the resistance of young permanent teeth enamel to sugar drink erosion, and promote the remineralization effects of demineralized enamel.

  20. Marginal Microleakage of Conventional Fissure Sealants and Self-Adhering Flowable Composite as Fissure Sealant in Permanent Teeth

    OpenAIRE

    Sara Rahimian-Imam; Nahid Ramazani; Mohammad Reza Fayazi

    2015-01-01

    Objectives: Application of sealants is a safe and effective way to prevent occlusal caries in the posterior teeth. A successful sealant therapy depends on good isolation. Decreased steps of adhesive application may enable proper isolation and use of self-adhering flowable composites for sealant therapy. This study sought to compare the marginal microleakage of fissure sealants and self-adhering flowable composites in permanent teeth.Materials and Methods: This in vitro, experimental study was...

  1. Immunolocalization of RANK and RANKL along the root surface and in the periodontal membrane of human primary and permanent teeth

    DEFF Research Database (Denmark)

    Bille, Marie-Louise Bastholm; Thomsen, Bjarke; Andersen, Thomas Levin

    2012-01-01

    in odontoblasts and in cells along denticles in one primary tooth. RANK was located in mononuclear cells in the pulp and in multinucleated odontoclasts along resorbed root surfaces and along resorbed dentin surfaces in the pulp in primary teeth and one permanent tooth. Conclusions. This study demonstrated RANK...... positivity in resorption areas in primary and permanent teeth. RANKL was positive in the pulp of one primary tooth. RANK expression in odontoclasts and RANKL expression in the pulp may indicate that RANK/RANKL play a role during resorption....

  2. Effect of acidulated phosphate fluoride gel application time on enamel demineralization of deciduous and permanent teeth.

    Science.gov (United States)

    Calvo, A F B; Tabchoury, C P M; Del Bel Cury, A A; Tenuta, L M A; da Silva, W J; Cury, J A

    2012-01-01

    Although the effect of acidulated phosphate fluoride gel (APF gel) on caries reduction in permanent teeth is based on evidence, the relevance of the clinical application time is still under debate. Also, the effect of 4- versus 1-min application has not been evaluated in deciduous enamel. In a blind, crossover, in situ study of 14 days, 16 adult volunteers wore palatal appliances containing slabs of human permanent and deciduous enamel. At the beginning of each phase, the slabs were submitted to one of the following treatments: no APF application (negative control); APF gel (1.23% F) application for 1 or 4 min. Biofilm accumulation on the slab surface was allowed and the slabs were subjected eight times a day to 20% sucrose, simulating a high cariogenic challenge condition. On the 15th day of each phase, fluoride retained as CaF(2) and fluorapatite (FAp) was determined on the enamel of the slabs and demineralization was assessed by cross-sectional microhardness. Fluoride as CaF(2) and FAp, formed by APF gel application on the enamel slabs not subjected to the cariogenic challenge, was also determined. APF gel reduced demineralization in both enamel types (p 0.05). CaF(2) and FAp formed and retained on deciduous and permanent enamel was significantly higher in APF gel groups (p 0.05). The findings suggest that 1 min of APF gel application provides a similar effect on inhibition of demineralization as 4 min, for both permanent and deciduous enamel. Copyright © 2012 S. Karger AG, Basel.

  3. Teething

    Science.gov (United States)

    ... because this can lead to infection. Avoid teething powders. NEVER give your child aspirin or place it against the gums or teeth. DO NOT rub alcohol on your baby's gums. DO NOT use homeopathic remedies, as they ...

  4. Sealing Ability of MTA Used in Perforation Repair of Permanent Teeth; Literature Review

    Science.gov (United States)

    Baroudi, Kusai; Samir, Samah

    2016-01-01

    There were several materials used to seal different types of perforation defects. MTA is one of these restorative materials that is considered the most effective, biocompatible, non-toxic, and non-irritant; promote bone healing and cementum regeneration. The objective of this article was to review and summarize the sealing ability of MTA compared with the other materials used for sealing different types of root perforations of permanent teeth. A literature search was conducted using Medline, accessed via the National Library of Medicine Pub Med from 2005 to 2015 searching for articles related to sealing ability of MTA. This study found that factors affecting prognosis are the size, site of the perforation and time elapsed as well as the repair material. MTA is an important filling material to be used for sealing different types of perforations when perforated sites sealed immediately with MTA. PMID:27347231

  5. Sealing Ability of MTA Used in Perforation Repair of Permanent Teeth; Literature Review.

    Science.gov (United States)

    Baroudi, Kusai; Samir, Samah

    2016-01-01

    There were several materials used to seal different types of perforation defects. MTA is one of these restorative materials that is considered the most effective, biocompatible, non-toxic, and non-irritant; promote bone healing and cementum regeneration. The objective of this article was to review and summarize the sealing ability of MTA compared with the other materials used for sealing different types of root perforations of permanent teeth. A literature search was conducted using Medline, accessed via the National Library of Medicine Pub Med from 2005 to 2015 searching for articles related to sealing ability of MTA. This study found that factors affecting prognosis are the size, site of the perforation and time elapsed as well as the repair material. MTA is an important filling material to be used for sealing different types of perforations when perforated sites sealed immediately with MTA.

  6. Treatment Outcomes of Mineral Trioxide Aggregate Pulpotomy in Vital Permanent Teeth with Carious Pulp Exposure: The Retrospective Study.

    Science.gov (United States)

    Linsuwanont, Pairoj; Wimonsutthikul, Kongthum; Pothimoke, Uht; Santiwong, Busayarat

    2017-02-01

    This study aimed to illustrate the treatment outcomes of mineral trioxide aggregate (MTA) pulpotomy in vital permanent teeth with carious pulp exposure. MTA pulpotomy was performed in 66 vital permanent teeth with carious pulp exposure including teeth with signs and symptoms of irreversible pulpitis and the presence of periapical radiolucency. Patients were assessed for clinical and radiographic outcomes by 2 examiners. The relationship between treatment outcomes and factors was analyzed by means of univariate analysis and binary logistic regression. Fifty patients (a total of 55 teeth) attended the follow-up examination. The age of the patients ranged from 7-68 years old (mean = 29 years old). For the follow-up period as far as 62 months, 48 teeth showed successful outcomes (success rate = 87.3%). Teeth with clinical signs of irreversible pulpitis and the presence of periapical radiolucency could be treated successfully by MTA pulpotomy with success rates of 84% and 76%, respectively.Three of 7 failed cases required pulpectomy after MTA pulpotomy to relieve painful pulpitis. Four other failed cases were asymptomatic, and failure was detected from radiographic examination. The relationship between treatment outcomes and treatment factors could not be detected statistically. Teeth with carious pulp exposure can be treated successfully by MTA pulpotomy. Clinical signs of irreversible pulpitis and the presence of periapical radiolucency should not be considered as a contraindication for pulpotomy. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  7. [The effect of Kaviner and the smear layer on dentin permeability of permanent teeth in children].

    Science.gov (United States)

    Tadmiscija, H; Kobaslija, S; Ganibegović, M; Jusufagić, H; Huseinbegović, A

    1996-01-01

    The dentin permeability is defined as a moving of fluid, of chemical substances and microbial products as well through the dentin. The clinical protection of children permanent teeth in other words the protection of pulp-dentin complex after their preparation makes a big problem into the restorative stomatology. Caviner is one of the newer means which is used in the protection of pulp-dentin complex which represents the components of powder dispersing within the ethyl-acetate mixture of polystirol. The important variable in this study is the presence or absence of smearing layer which has the important influence onto the dentin permeability. In order to confirm the Caviner and smearing layer working onto the dentin permeability of the children permanent teeth in vitro experiment was designed. We used for it the dentin disks made of the intact first premolar, extracted because of orthodontic reasons at the ten years old children. They were put into the split chamber which represents a part of apparatus made at our Faculty, which is, in fact, a modified apparatus which was formed by prof. D.H. Pashley (Georgia, USA), and it is used for measuring of dentin permeability with the help of hydraulic conductance (Lp) of dentin. The dentin permeability is expressed by the hydraulic conductance term, but the measures are still expressed as the Lp percentage maximum because of better survey of results. Comparing the obtained results with the other authors results we have come to the similar conclusions, and that is in fact, that the smearing layer significantly reduces the dentin permeability, and that the Caviner, as the other layners, reduces the dentin permeability. If we compare the reduction of dentin permeability at the dentin covered with the smearing layer and with the Caviner, it has been noticed that the smearing layer reduces more significantly. It should be accented that the Caviner reduces the dentin permeability less than the most earlier researched means for

  8. Revascularization in Immature Permanent Teeth with Necrotic Pulp and Apical Pathology: Case Series

    Directory of Open Access Journals (Sweden)

    López Carmen

    2017-01-01

    Full Text Available Introduction. To present and discuss the results of five clinical cases treated using the revascularization protocol, showing clinical and radiographic monitoring. Necrotic immature teeth with periapical pathology present a challenge to dentists because the techniques used in apexification leave the tooth susceptible to fracture, since the root does not continue to grow in length and the canal walls are thin. Revascularization has emerged as an alternative to resolve these deficiencies, enabling apical closure, continued development of the roots, and thickening of the dentinal walls. Case Series. Five clinically and radiographically diagnosed necrotic immature permanent teeth were treated using revascularization treatment. The therapeutic protocol involved accessing the pulp chamber; irrigating copiously with NaOCl; applying a triple antibiotic paste as intracanal dressing; then provisionally sealing it. After 3 weeks, the canal was cleaned and the apex irritated with a size 15 K-file to induce blood that would serve as a scaffold for pulp revascularization. MTA was used to seal the chamber before final obturation (composite or metallic crown. Conclusion. The discussion of the results leads to debate about different restorative materials and other published protocols.

  9. Histological Evaluation of Allium sativum Oil as a New Medicament for Pulp Treatment of Permanent Teeth.

    Science.gov (United States)

    Mohammad, Shukry Gamal; Raheel, Syed Ahmed; Baroudi, Kusai

    2015-02-01

    The objective of this study was to evaluate the histo pathology effects of two medicaments Allium sativum oil and formocresol on the remaining pulp tissue of the permanent teething children. A total of 18 premolars were included in this study. Two sound premolars were extracted and subjected to histological examination to show the normal pulp tissue. Pulpo tomy procedure was performed in the rest of the remaining 16 premolars; half of them using Allium sativum oil and the rest of the tested premolars were medicated using formocresol and all were sealed with suitable restoration. Then, premolars extracted at variable intervals (48 hours, 2 weeks, 1 month, 2 months), stained using hemotoxylin and eosin etain (H&E) and prepared for histopathology examination. Histological evaluation seemed far more promising for Allium sativum oil than formocresol. Histological evaluation revealed that teeth treated with Allium sativa oil showed infammatory changes that had been resolved in the end of the study. On the contrary, the severe chronic infammation of pulp tissue accompanied with formocresol eventually produced pulp necrosis with or without fibrosis. In addition, pulp calcification was evidenced in certain cases. Allium sativum oil is a biocompatible material that is compatible with vital human pulp tissue. It offers a good healing potential, leaving the remaining pulp tissue healthy and functioning.

  10. Tip and Torque Angle of Permanent Teeth: A Comparison Between Treated Patients and Normal Group

    Directory of Open Access Journals (Sweden)

    A.F. Miresmaeili

    2005-01-01

    Full Text Available The angle of long axis of tooth crown is called tip in mesiodostal and torque in faciolingual direction. Both have special importance for producing an ideal occlusion. The aim of the present study was determination of the average tip and torque of each permanent tooth in well treated patients with edgewise system compare to control group with normal occlusion. In this study, 19 well treated cases through standard edgewise technique with non extraction strategy and 20 students of pre-university schools with normal occlusion according to IOTN were selected. Reference points and lines were marked on facial surface of each tooth on casts. Special device was designed for measuring the faciolingual and mesiodistal inclination of crowns. After 3 times measuring the tip and torque of teeth, student t-test and Kruskal – Wallis analysis were used for statistical analysis.The mean age of control group was 18.8 ± 0.5 year and in treated group was 20.3 ± 0.8. There was significant difference between mean of torque in control group and treated group for upper lateral incisor (4.75±5.21 , 8.76±5.82 respectively , p<0.03 . Also a significant difference was seen in average torque of lower second premolar between control group and treated one ( -23.48±5.99 , -26.66±4.64 respectively , p<0.05. There were no significant differences in tip of teeth between two groups. In comparison with Andrews study, in normal occlusion group, upper canine & first molar and lower lateral & first premolar had more buccal root torque. Except the torque of upper lateral incisor and lower 2nd premolar, torque and tip of other teeth had no significant difference.

  11. Prevalence and Pattern of Accessory Teeth (Hyperdontia in Permanent Dentition of Iranian Orthodontic Patients.

    Directory of Open Access Journals (Sweden)

    Fariborz Amini

    2013-11-01

    Full Text Available Awareness of hyperdontia pattern/prevalence can be useful in early diagnosis and prevention by general practitioners, pediatric dentists, and orthodontists. Since the previous results regarding the pattern of hyperdontia (supernumerary teeth are controversial, this study aimed to assess this subject among Iranian orthodontic patients.All approved panoramic radiographs of 3374 orthodontic patients (aged 10 to 20 years old who had visited orthodontic departments of all Tehran dentistry universities and 10 private clinics during the years 1999-2009 were investigated to establish the prevalence/pattern of hyperdontia in permanent dentition (excluding third molars. The data were analyzed using a chi-square, a chi-square goodness-of-fit, and a Fisher exact test (α=0.05.Of the patients, 2012 were female and 1362 were male. The prevalence of hyperdontia was 0.72% (14 females [0.69% of females], 10 males [0.73% of males], female-to-male ratio=1:1.055. The difference between the genders was not significant (P = 0.896. No double or multiple supernumeraries were found. The most common accessory teeth were mesiodens (58.3%, maxillary laterals (25%, and maxillary premolars (16.7%. Hyperdontia was significantly more common (P=0.000 in maxilla (there was only one mandibular accessory tooth. It was more frequent in the anterior segment (P=0.000. However the occurrence was not significantly different between bimaxillary right and left quadrants (P=0.6.Hyperdontia was more common in premaxilla, and the most common accessory tooth was mesiodens. Unlike earlier studies, no bilateral accessory teeth were found. Also no gender dimorphism was discerned.

  12. Prevalence and Pattern of Accessory Teeth (Hyperdontia) in Permanent Dentition of Iranian Orthodontic Patients.

    Science.gov (United States)

    Amini, Fariborz; Rakhshan, Vahid; Jamalzadeh, Sanaz

    2013-11-01

    Awareness of hyperdontia pattern/prevalence can be useful in early diagnosis and prevention by general practitioners, pediatric dentists, and orthodontists. Since the previous results regarding the pattern of hyperdontia (supernumerary teeth) are controversial, this study aimed to assess this subject among Iranian orthodontic patients. All approved panoramic radiographs of 3374 orthodontic patients (aged 10 to 20 years old) who had visited orthodontic departments of all Tehran dentistry universities and 10 private clinics during the years 1999-2009 were investigated to establish the prevalence/pattern of hyperdontia in permanent dentition (excluding third molars). The data were analyzed using a chi-square, a chi-square goodness-of-fit, and a Fisher exact test (α=0.05). Of the patients, 2012 were female and 1362 were male. The prevalence of hyperdontia was 0.72% (14 females [0.69% of females], 10 males [0.73% of males], female-to-male ratio=1:1.055). The difference between the genders was not significant (P = 0.896). No double or multiple supernumeraries were found. The most common accessory teeth were mesiodens (58.3%), maxillary laterals (25%), and maxillary premolars (16.7%). Hyperdontia was significantly more common (P=0.000) in maxilla (there was only one mandibular accessory tooth). It was more frequent in the anterior segment (P=0.000). However the occurrence was not significantly different between bimaxillary right and left quadrants (P=0.6). Hyperdontia was more common in premaxilla, and the most common accessory tooth was mesiodens. Unlike earlier studies, no bilateral accessory teeth were found. Also no gender dimorphism was discerned.

  13. Health Instruction Packages: Permanent Teeth, Dental Deposits, and Dental Instruments. Dientes Permanentes, Depositos Dentales y Instrumentos Dentales.

    Science.gov (United States)

    Lind, Patricia; Germano, Catherine

    These five learning modules use text interspersed with illustrations and reinforcement exercises to instruct dental aide and dental hygiene students about jaw bones and gums, dental deposits, and dental instruments. The first four modules were prepared by Patricia Lind in both Spanish and English. "The Gum and Bone of Permanent Teeth"…

  14. Multidisciplinary approach on rehabilitation of primary teeth traumatism repercussion on the permanent successor: 6-year follow-up case report.

    Science.gov (United States)

    Mello-Moura, A C V; Bonini, G A V C; Suga, S S; Navarro, R S; Wanderley, M T

    2009-01-01

    Traumatic lesions in primary teeth are frequent in pediatric patients and can cause problems both to the deciduous tooth and permanent successor. The impact strength on deciduous tooth can reach the growing permanent tooth, affecting its morphology, structure and position, or even hampering its proper development. This report describes an aesthetic-functional rehabilitation process in an 8 year 10 month old boy during a multidisciplinary treatment held at the Clinical Center of Dental Trauma in Primary Teeth of the Pediatric Dentistry of Dental College of University of São Paulo, Brazil. The patient presented bilateral posterior cross bite and the permanent left upper central incisor with ectopic eruption and enamel hypoplasy, preceded by avulsion of element 61, occurred when the patient was 1.6 years old. After diagnosis and treatment planning, a quick expansion of jaws was recommended with Hass-type rapid expander and orthodontic leveling with fixed braces. Due to the ectopic eruption, the gingival contour had been altered and hypertrophia was found, compromising aesthetics and avoiding local hygienic procedures. Gingivoplasty was carried out with high-intensity Diode Laser, followed by aesthetic restoration with compound resin. It was concluded that after deciduous teeth traumatism it is important that the patient undergoes clinic and radiographic assistance until the permanent teeth erupt so that an adequate multidisciplinary treatment can be offered to the patient.

  15. Multidisciplinary approach on rehabilitation of primary teeth traumatism repercussion on the permanent successor: 6-year follow-up case report

    Directory of Open Access Journals (Sweden)

    Mello-Moura ACV

    2009-06-01

    Full Text Available Traumatic lesions in primary teeth are frequent in pediatric patients and can cause problems both to the deciduous tooth and permanent successor. The impact strength on deciduous tooth can reach the growing permanent tooth, affecting its morphology, structure and position, or even hampering its proper development. This report describes an aesthetic-functional rehabilitation process in an 8 year 10 month old boy during a multidisciplinary treatment held at the Clinical Center of Dental Trauma in Primary Teeth of the Pediatric Dentistry of Dental College of University of São Paulo, Brazil. The patient presented bilateral posterior cross bite and the permanent left upper central incisor with ectopic eruption and enamel hypoplasy, preceded by avulsion of element 61, occurred when the patient was 1.6 years old. After diagnosis and treatment planning, a quick expansion of jaws was recommended with Hass-type rapid expander and orthodontic leveling with fixed braces. Due to the ectopic eruption, the gingival contour had been altered and hypertrophia was found, compromising aesthetics and avoiding local hygienic procedures. Gingivoplasty was carried out with high-intensity Diode Laser, followed by aesthetic restoration with compound resin. It was concluded that after deciduous teeth traumatism it is important that the patient undergoes clinic and radiographic assistance until the permanent teeth erupt so that an adequate multidisciplinary treatment can be offered to the patient.

  16. Marginal Microleakage of Conventional Fissure Sealants and Self-Adhering Flowable Composite as Fissure Sealant in Permanent Teeth

    Directory of Open Access Journals (Sweden)

    Sara Rahimian-Imam

    2015-11-01

    Full Text Available Objectives: Application of sealants is a safe and effective way to prevent occlusal caries in the posterior teeth. A successful sealant therapy depends on good isolation. Decreased steps of adhesive application may enable proper isolation and use of self-adhering flowable composites for sealant therapy. This study sought to compare the marginal microleakage of fissure sealants and self-adhering flowable composites in permanent teeth.Materials and Methods: This in vitro, experimental study was conducted on 60 extracted human premolar teeth. The teeth were divided randomly into two groups of 30. In the first group, fissure sealant (Clinpro, 3M ESPE, USA was placed on the teeth. In the second group, self-adhering flowable composite (Vertise Flow, Kerr, USA was applied as the sealant. Then, both groups were immersed in 0.5% fuchsin dye solution for 24 hours. Sectioned samples were observed with a stereomicroscope for the extent of dye penetration. Data were analyzed using SPSS 21 and the Mann-Whitney test (P<0.05.Results: Microleakage in the fissure sealant group was significantly higher than that in the self-adhering flowable composite group (P<0.001.Conclusion: Microleakage was less using self-adhering flowable composite compared to conventional fissure sealant; therefore, self-adhering flowable composite can be used as a suitable fissure sealant in permanent teeth.

  17. The combined effect of xylitol and fluoride in varnish on bovine teeth surface microhardness.

    Science.gov (United States)

    Vongsavan, Kadkao; Surarit, Rudee; Rirattanapong, Praphasri

    2014-03-01

    The aim of this study was to evaluate the combined effect of xylitol and fluoride in varnish on bovine tooth surface microhardness. Thirty caries-free bovine teeth were sectioned and embedded in self-cured acrylic resin and the buccal enamel surfaces were ground flat. Each tooth was then placed in demineralization solution for 40 hours. After demineralization, the teeth were randomly divided into 3 equal groups: group 1 was the control group (no treatment); group 2 was treated with fluoride varnish (Duraphat); group 3 was treated with a xylitol and fluoride varnish (Flor-Opal). All the specimens were then subjected to pH-cycling for 7 days, consisting of demineralization for 6 hours and remineralization for 18 hours repeated daily for five days followed by remineralization for 2 days. Surface microhardness was checked in each tooth at baseline, after demineralization and after pH-cycling. The results were recorded and the data were analyzed with the one-way ANOVA and Tukey tests. A p-value fluoride varnish and the fluoride with xylitol varnish were not significantly different from each other and showed significantly better remineralization than control group. The fluoride and xylitol varnish combination was beneficial for preventing enamel demineralization but no better than in fluoride varnish alone in vitro. Adding xylitol to fluoride tooth varnish does not appear to give any significant benefit in vitro.

  18. MTA pulpotomy as an alternative to root canal treatment in children's permanent teeth in a dental public health setting.

    Science.gov (United States)

    Alqaderi, Hend E; Al-Mutawa, Sabiha A; Qudeimat, Muawia A

    2014-11-01

    This prospective clinical study evaluated the success of vital pulpotomy treatment for permanent teeth with closed apices using mineral trioxide aggregates (MTA) in a dental public health setting. Twenty-seven mature permanent first molars and 2 premolars (in 25 patients) with carious exposure were treated using MTA pulpotomy. Age of patients ranged from 10- to 15-years (mean=13.2±1.74-years). Four trained and calibrated practitioners performed the same clinical procedure for all patients. Following isolation and caries removal, the inflamed pulp tissue was completely removed from the pulp chamber. This was followed by irrigation with 2% sodium hypochlorite. Haemostasis was achieved using a cotton pellet damped in normal saline. A white MTA paste was placed against the pulp orifices. MTA was covered with a damped cotton pellet and a base of IRM. Patients were recalled after 1 day where a glass ionomer liner and a final restoration were placed. Teeth were evaluated clinically and radiographically for up to 47 months. Mean follow-up period for all teeth was 25±14 months. Twenty-six of the 29 teeth were clinically asymptomatic with no evidence of periradicular or root pathology during the follow-up period. The estimated success rate was 90%. Three teeth presented with clinical symptoms of pain and radiographic evidence of periradicular pathology that indicated root canal treatment (RCT) or extraction. When managing carious pulp exposures of permanent teeth with closed root apices in children, MTA pulpotomy showed a high success rate. MTA pulpotomy for permanent molars in children is a viable alternative to RCT. Copyright © 2014 Elsevier Ltd. All rights reserved.

  19. Dental trauma. Combination injuries 1. The risk of pulp necrosis in permanent teeth with concussion injuries and concomitant crown fractures

    DEFF Research Database (Denmark)

    Lauridsen, Eva Fejerskov; Hermann, Nuno Vibe; Gerds, Thomas Alexander

    2012-01-01

    by the Kaplan–Meier method and Cox regression. Risk factors included in the analysis: gender, age, stage of root development, type of crown fracture, and response to electric pulp test (EPT) at the initial examination. The level of significance was set at 5%. Results:  The risk of PN was low in teeth......The reported risk of pulp necrosis (PN) is low in teeth with concussion injuries. A concomitant crown fracture may affect the risk of PN. Aim:  To analyze the influence of a crown fracture (with and without pulp exposure) on the risk of PN in teeth with concussion injury. Material:  The study...... included 469 permanent incisors with concussion from 358 patients (226 male, 132 female). Among these, 292 had a concomitant crown fracture (70 with and 222 without pulp exposure). All teeth were examined and treated according to standardized protocol. Statistical analysis:  The risk of PN was analyzed...

  20. Provider Perceptions of Treatment Options for Immature Permanent Teeth.

    Science.gov (United States)

    St Paul, Alison; Phillips, Ceib; Lee, Jessica Y; Khan, Asma A

    2017-06-01

    Current treatment options for immature permanent teeth with pulpal necrosis include both apexification and regenerative endodontics. The purpose of this study was to survey endodontists on the use of these 2 treatment options. Surveys were created by using Qualtrics and Teleform software and distributed by using the Salant and Dillman method. Endodontists (n = 1615) in 4 geographically and demographically diverse states, North Carolina, New York, Texas, and California, were surveyed. Data were analyzed by using descriptive statistics and χ(2) analysis. Level of significance was set at 0.05. A 32.9% response rate was obtained. The majority of responders reported that apexification was the treatment of choice when considering the evidence base supporting the treatment (60%) and the predictability of treatment outcome (77.8%). Apexification was also the preferred treatment by 57.3% of respondents when asked to consider patient compliance, by 51.2% when considering the number of required patient appointments, and by 53.3% when considering the likelihood of tooth discoloration. Regenerative endodontics was reported as the preferred treatment by 89% of respondents when considering continued root development and by 66.7% when considering apical closure. The respondents' age and continuing education courses taken were significantly associated with their preferred treatment option. The results of our study indicate that endodontists consider both clinical and patient factors when treating immature teeth with pulpal necrosis. Increase in continuing education options may increase adoption of regenerative endodontic therapy. Copyright © 2017 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  1. Regenerative Endodontics Versus Apexification in Immature Permanent Teeth with Apical Periodontitis: A Prospective Randomized Controlled Study.

    Science.gov (United States)

    Lin, Jiacheng; Zeng, Qian; Wei, Xi; Zhao, Wei; Cui, Minyi; Gu, Jing; Lu, Jiaxuan; Yang, Maobin; Ling, Junqi

    2017-08-29

    The aim of the study was to compare the outcomes of regenerative endodontic treatment (RET) and apexification on immature permanent teeth with pulp necrosis and apical periodontitis. A total of 118 patients (118 teeth) were recruited and randomly assigned to either RET or apexification treatment. Each treatment group was divided into 2 subgroups according to the etiology: dens evaginatus or trauma. Clinical symptoms and complications were recorded, and cone-beam computed tomographic imaging with a limited field of view was used to measure the change of root length, root thickness, and apical foramen size at the 12-month follow-up. The t test/rank sum test and Fisher exact test were applied to compare the change of root morphology between RET and apexification. One hundred three of 118 cases were completed at the 12-month follow-up. The survival rate was 100% for both treatment groups. All cases were asymptomatic with apical healing. The RET group showed a significant increase in root length and root thickness compared with the apexification group (P < .05). In the RET group, the cases caused by dens evaginatus achieved increased root length and root thickness compared with those caused by trauma (P < .05). RET and apexification achieved a comparable outcome in regard to the resolution of symptoms and apical healing. RET showed a better outcome than apexification regarding increased root thickness and root length. The etiology had an impact on the outcome of RET. Dens evaginatus cases showed better prognoses than trauma cases after RET. Copyright © 2017 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  2. Hand and ultrasonic instrumentation for orthograde root canal treatment of permanent teeth

    Directory of Open Access Journals (Sweden)

    Vinícius Pedrazzi

    2010-06-01

    Full Text Available Root canal treatment is a frequently performed dental procedure and is carried out on teeth in which irreversible pulpitis has led to necrosis of the dental pulp. Removal of the necrotic tissue remnants and cleaning and shaping of the root canal are important phases of root canal treatment. Treatment options include the use of hand and rotary instruments and methods using ultrasonic or sonic equipment. OBJECTIVES: The objectives of this systematic review of randomized controlled trials were to determine the relative clinical effectiveness of hand instrumentation versus ultrasonic instrumentation alone or in conjunction with hand instrumentation for orthograde root canal treatment of permanent teeth. MATERIAL AND METHODS: The search strategy retrieved 226 references from the Cochrane Oral Health Group Trials Register (7, the Cochrane Central Register of Controlled Trials (CENTRAL (12, MEDLINE (192, EMBASE (8 and LILACS (7. No language restriction was applied. The last electronic search was conducted on December 13th, 2007. Screening of eligible studies was conducted in duplicate and independently. RESULTS: Results were to be expressed as fixed-effect or random-effects models using mean differences for continuous outcomes and risk ratios for dichotomous outcomes with 95% confdence intervals. Heterogeneity was to be investigated including both clinical and methodological factors. No eligible randomized controlled trials were identifed. CONCLUSIONS: This review illustrates the current lack of published or ongoing randomized controlled trials and the unavailability of high-level evidence based on clinically relevant outcomes referring to the effectiveness of ultrasonic instrumentation used alone or as an adjunct to hand instrumentation for orthograde root canal treatment. In the absence of reliable research-based evidence, clinicians should base their decisions on clinical experience, individual circumstances and in conjunction with patients

  3. Comparison of mechanical and chemomechanical methods of caries removal in deciduous and permanent teeth: a SEM study.

    Science.gov (United States)

    Avinash, A; Grover, S D; Koul, M; Nayak, M T; Singhvi, A; Singh, R K

    2012-01-01

    Mechanical method of caries removal is associated with the removal of sound tooth structure, production of pain, heat, annoying sounds, and vibrations. Chemomechanical caries removal method is based on removal of only carious dentin leaving sound dentin intact. The aim of this study was to compare the efficacy of mechanical and chemomechanical methods of caries removal in deciduous and permanent teeth. A total of 30 carious teeth including 15 deciduous and 15 permanent teeth having dentinal caries selected randomly and cut into two halves through center of the lesion, were subjected to caries removal by mechanical (Group A), and chemomechanical methods (Group B). Time taken for removal of caries was noted with stopwatch. Samples were prepared and seen under the scanning electron microscope for the presence of bacterial colonies. Data were analyzed using statistical package for social sciences (SPSS) Software. No significant difference was found for the presence of bacterial colonies in both groups of deciduous and permanent teeth; however, time taken for caries removal by the chemomechanical method was twice than the mechanical method. despite the insignificant presence of bacterial colonies and twice time taken as compared to mechanical method, chemomechanical method was easy to introduce, was painless, did not form smear layer and conserved the sound tooth structure.

  4. Comparison of mechanical and chemomechanical methods of caries removal in deciduous and permanent teeth: A SEM study

    Directory of Open Access Journals (Sweden)

    A Avinash

    2012-01-01

    Full Text Available Background: Mechanical method of caries removal is associated with the removal of sound tooth structure, production of pain, heat, annoying sounds, and vibrations. Chemomechanical caries removal method is based on removal of only carious dentin leaving sound dentin intact. Aim: The aim of this study was to compare the efficacy of mechanical and chemomechanical methods of caries removal in deciduous and permanent teeth. Study Design: A total of 30 carious teeth including 15 deciduous and 15 permanent teeth having dentinal caries selected randomly and cut into two halves through center of the lesion, were subjected to caries removal by mechanical (Group A, and chemomechanical methods (Group B. Time taken for removal of caries was noted with stopwatch. Samples were prepared and seen under the scanning electron microscope for the presence of bacterial colonies. Data were analyzed using statistical package for social sciences (SPSS Software. Results: No significant difference was found for the presence of bacterial colonies in both groups of deciduous and permanent teeth; however, time taken for caries removal by the chemomechanical method was twice than the mechanical method. Conclusion: despite the insignificant presence of bacterial colonies and twice time taken as compared to mechanical method, chemomechanical method was easy to introduce, was painless, did not form smear layer and conserved the sound tooth structure.

  5. The effect of low-level laser therapy (810 nm) on root development of immature permanent teeth in dogs.

    Science.gov (United States)

    Fekrazad, Reza; Seraj, Bahman; Ghadimi, Sara; Tamiz, Parvin; Mottahary, Pouriya; Dehghan, Mohammad-Mehdi

    2015-05-01

    Traumatic injuries and dental caries can be a big challenge to immature teeth. In these cases, the main purpose of treatment is to maintain the pulp vitality. The purpose of this study was to investigate the effect of low-level laser therapy on accelerating the rate of dentinogenesis in pulpotomy of immature permanent teeth (apexogenesis). Three dogs, 4-6 months old, were used in this study. One jaw in each dog was randomly assigned to laser irradiation group. All selected teeth were pulpotomized with mineral trioxide aggregate (MTA) and restored with amalgam. In the laser group, the Ga-Al-As laser (810 nm, 0.3 W, 4 J/cm(2), 9 s) was used on buccal and lingual gingiva of each tooth in 48 h intervals for 2 weeks. In order to observe the newly formed dentine, tetracycline was injected on the 1st, 3rd, 7th, and 14th day after the operation. Then, ground sections of teeth were observed under a fluorescence microscope. The data was analyzed with Generalized Estimating Equations (GEE) test. The mean distance between the lines of tetracycline formed on the 1st and 14th day was significantly higher in the laser group (P = 0.005). Within the limitation of this study, irradiation of Ga-Al-As laser (810 nm) can accelerate the rate of dentinogenesis in apexogenesis of immature permanent teeth with MTA in dogs.

  6. Comparative study of substance P and neurokinin A in gingival crevicular fluid of healthy and painful carious permanent teeth

    Science.gov (United States)

    Heidari, Alireza; Shahrabi, Mahdi; Rokouei, Mehrak; Amirzargar, Aliakbar; Rahbar, Pegah

    2017-01-01

    Background: It is shown that neuropeptides can be transported from pulp chamber to periodontal ligament through apical foramen and accessory canals. Therefore, clinical pulpal pain leads to expression of preinflammatory neuropeptides such as substance P (SP) and neurokinin A (NKA) in gingival crevicular fluid (GCF). This study aimed to evaluate levels of SP and NKA in GCF of carious and healthy permanent teeth, comparatively. Materials and Methods: This cross-sectional study was performed on twenty children referred to Department of Pediatric Dentistry, Tehran University of Medical Sciences, who had a painful permanent first molar. Sampling was done by sterile paper cone from GCF of the mentioned teeth and the intact tooth of the other side of the jaw in the same patient. Values of SP and NKA were measured by ELISA test. Results: The mean concentration of SP in GCF of painful carious and healthy teeth was 2.65 ± 0.56 and 1.83 ± 0.65 pcgr/ml, respectively. This value was 2.29 ± 0.29 and 1.61 ± 0.35 pcgr/ml for NKA concentration in carious and healthy teeth as well. Conclusion: Significant higher levels of both SP and NKA in GCF of painful carious teeth were observed, which is in line with previous studies’ findings.

  7. Comparative study of substance P and neurokinin A in gingival crevicular fluid of healthy and painful carious permanent teeth.

    Science.gov (United States)

    Heidari, Alireza; Shahrabi, Mahdi; Rokouei, Mehrak; Amirzargar, Aliakbar; Rahbar, Pegah

    2017-01-01

    It is shown that neuropeptides can be transported from pulp chamber to periodontal ligament through apical foramen and accessory canals. Therefore, clinical pulpal pain leads to expression of preinflammatory neuropeptides such as substance P (SP) and neurokinin A (NKA) in gingival crevicular fluid (GCF). This study aimed to evaluate levels of SP and NKA in GCF of carious and healthy permanent teeth, comparatively. This cross-sectional study was performed on twenty children referred to Department of Pediatric Dentistry, Tehran University of Medical Sciences, who had a painful permanent first molar. Sampling was done by sterile paper cone from GCF of the mentioned teeth and the intact tooth of the other side of the jaw in the same patient. Values of SP and NKA were measured by ELISA test. The mean concentration of SP in GCF of painful carious and healthy teeth was 2.65 ± 0.56 and 1.83 ± 0.65 pcgr/ml, respectively. This value was 2.29 ± 0.29 and 1.61 ± 0.35 pcgr/ml for NKA concentration in carious and healthy teeth as well. Significant higher levels of both SP and NKA in GCF of painful carious teeth were observed, which is in line with previous studies' findings.

  8. Update on Nonsurgical, Ultraconservative Approaches to Treat Effectively Non-Cavitated Caries Lesions in Permanent Teeth

    Science.gov (United States)

    Borges, Boniek Castillo Dutra; de Souza Borges, Juliane; de Araujo, Larissa Sgarbosa Napoleao; Machado, Claudia Tavares; dos Santos, Alex Jose Souza; de Assunçao Pinheiro, Isauremi Vieira

    2011-01-01

    Dental caries on tooth surfaces is still a problem in many industrialized countries. For many years, dentistry was influenced by a mechanical approach characterized by the use of high-speed rotary cutting instruments, and dentists predominantly used surgical methods to address caries. This included radical removal of diseased portions of the tooth, along with material-driven geometric extensions to areas that were assumed to be caries-resistant. This concept of extension for prevention was introduced by G. V. Black and influenced dentists for more than 120 years. Recently, a new paradigm of operative conservatism, sometimes referred to as “minimally invasive dentistry,” has gained popularity. This paradigm is designed to promote maximum preservation of healthy dental structures over a lifetime. The aim of this review is to discuss the efficacy of current nonsurgical treatments for non-cavitated caries lesions in permanent teeth. Based on results obtained from clinical trials, this review evaluates treatments such as consumption of CPP-ACP added gums, resin infiltration and fissure sealing. Although in a few cases an invasive approach is needed to arrest caries progression, the non-surgical approach generally provides potential benefits that include conserving structure by delaying intervention or minimizing the operative procedure. All current non-invasive methods are effective in treating non-cavitated caries lesions. The adoption of non-invasive approaches in the management of these lesions can preserve dental tissues, thus increasing tooth longevity. PMID:21494394

  9. [Effectiveness of 3 different methods in prevention of dental caries in permanent teeth among children].

    Science.gov (United States)

    Tang, Li-hong; Shi, Le; Yuan, Shuang; Lv, Jin; Lu, Hai-xia

    2014-12-01

    To compare the effectiveness of fluoride vanish, fluoride foam, pit and fissure sealant with fluoride in prevention of dental caries, and investigate appropriate approach to prevent dental caries at schools. A randomized controlled clinical trial with 4 parallel groups was conducted. Totally 1016 children from 4 schools and 33 classes with a mean age of 7 to 8 years were included. They were randomly allocated into 4 groups: (1) fluoride vanish, semi-annual application; (2) fluoride foam, semi-annual application; (3) resin sealant, single placement; and (4) placebo control with oral hygiene instruction. Follow-up examinations were conducted after 2 years to monitor dental caries increment of first molars among these children. Data analysis was performed using SPSS 18.0 software package. Two years later, 977 children (96.2%) were examined. The results of multiple factor ANCOVA showed that fluoride vanish and resin sealant had significantly lower mean dental caries increment on tooth surface compared with control group (P0.05). The placement of resin sealant with fluoride and annual application of fluoride protector are effective in prevention of dental caries in permanent teeth of children.

  10. REASONS AND RISKS OF PERMANENT TEETH EXTRACTION. THE GENERAL DENTAL PRACTICE IN GREECE

    Directory of Open Access Journals (Sweden)

    N.A. CHRYSANTHAKOPOULOS

    2013-12-01

    Full Text Available Aim: The aim of this retrospective study was to inves‑ tigate the reasons for tooth extraction and their associati‑ ons with possible risk indicators, such as socio-demographic and other epidemiological variables analyzed in dental practice in Greece. Materials and method: The study invol‑ ved 2,250 individuals, 1,170 males and 1,080 females aged 18 to 78 years. Data were collected by means of an intervi‑ ewer-administered questionnaire and oral clinical exami‑ nation. Statistical analysis of the questionnaire items was performed with a multivariate regression analysis model in order to estimate the possible associations between den‑ tal caries and periodontal disease as dependent variables, as well as the socio-demographic and other epidemiologi‑ cal variables, as independent parameters. Results: A total of 5,568 permanent teeth were extracted for various rea‑ sons during the study. The results showed that the main reasons for tooth extraction were dental caries (37.3% and periodontal disease (35.0%.Tooth extraction due to dental caries was associated with risk indicators of lower educa‑ tional and income level, inadequate oral hygiene and lack of a regular dental follow-up, whereas tooth extraction due to periodontal disease was associated with the same vari‑ ables, to which smoking was added. Conclusions: Dental caries and periodontal disease were the main reasons for tooth extraction in Greece. In addition, significant associ‑ ations were recorded between the causes of tooth extrac‑ tion and the possible risk indicators under analysis

  11. A comparative evaluation of four restorative materials to support undermined occlusal enamel of permanent teeth.

    Science.gov (United States)

    Prabhakar, A R; Thejokrishna, P; Kurthukoti, A J

    2006-09-01

    The purpose of this study was to test the support to undermined occlusal enamel provided by posterior restorative composite (FiltekTM P60, 3M Dental products USA), polyacid modified resin composite (F2000 compomer, 3M Dental products, USA.), radiopaque silver alloy-glass ionomer cement (Miracle Mix. GC Corp, Tokyo, Japan) and Glass Ionomer cement (Fuji IX GP). To test each material, 20 human permanent mandibular third molars were selected. The lingual cusps were removed and the dentin supporting the facial cusps was cut away, leaving a shell of enamel. Each group of prepared teeth was restored using the materials according to the manufacturer's instructions. All the specimens were thermocycled (250 cycles, 6 degrees C- 60 degrees C, dwell time 30 seconds) and then mounted on an acrylic base. Specimens were loaded evenly across the cusp tips at a crosshead speed of 5 mm /minute in Hounsfield universal testing machine until fracture occurred. Data obtained was analyzed using analysis of variance and Studentized- Newman- Keul's range test. No significant differences were detected in the support provided by P-60, F 2000, Miracle Mix or Fuji IX GP groups. The support provided to undermined occlusal enamel by these materials was intermediate between no support and that provided by sound dentin. Without further development in dental material technology and evidence of its efficacy, restorative materials should not be relied upon to support undermined occlusal enamel to a level comparable to that provided by sound dentin.

  12. Difference of histology and elemental composition of the cervical enamels among human permanent teeth

    Institute of Scientific and Technical Information of China (English)

    Masashi TAKAHASHI; Shin-Ichi GOTO; Kazuhisa MORI; Izumi MATAGA

    2008-01-01

    The purpose of this study is to clarify the dif-ference of histology and elemental composition of the cer-vical enamels among the human permanent teeth. The re-ground surfaces at the cervical enamels of them were observed under scanning electron microscopy (SEM). The contents of seven elements were analyzed quantita-tively with electron probe microanalyzer (EPMA). The widths of the rod sections at the cervical enamels were larger than those at the cuspal enamels. The rod sections at the mesial cervical enamels in the incisors were more obscure and more decayed by acid solution than those in the premolars and molars. The calcium and phosphorus contents of the cervical enamels were significantly lower than those of the cuspal enamels. The carbon content of the cervical enamels was significantly higher than that of the cuspal enamels. The calcium and phosphorus contents of the cervical enamels were the significantly highest in the premolars. The carbon and sodium contents of the cer-vical enamels were significantly highest in the premolars. It is thought that the calcification level is lower, while the content of organic matter is higher at the cervical enamels than those at the cuspal enamels. It is considered that the sodium causes high calcification.

  13. A comparative evaluation of four restorative materials to support undermined occlusal enamel of permanent teeth

    Directory of Open Access Journals (Sweden)

    Prabhakar A

    2006-09-01

    Full Text Available The purpose of this study was to test the support to undermined occlusal enamel provided by posterior restorative composite (FiltekTM P60, 3M Dental products USA, polyacid modified resin composite (F2000 compomer, 3M Dental products, USA., radiopaque silver alloy-glass ionomer cement (Miracle Mix. GC Corp, Tokyo, Japan and Glass Ionomer cement (Fuji IX GP. To test each material, 20 human permanent mandibular third molars were selected. The lingual cusps were removed and the dentin supporting the facial cusps was cut away, leaving a shell of enamel. Each group of prepared teeth was restored using the materials according to the manufacturer′s instructions. All the specimens were thermocycled (250 cycles, 6°C- 60°C, dwell time 30 seconds and then mounted on an acrylic base. Specimens were loaded evenly across the cusp tips at a crosshead speed of 5 mm /minute in Hounsfield universal testing machine until fracture occurred. Data obtained was analyzed using analysis of variance and Studentized- Newman- Keul′s range test. No significant differences were detected in the support provided by P-60, F 2000, Miracle Mix or Fuji IX GP groups. The support provided to undermined occlusal enamel by these materials was intermediate between no support and that provided by sound dentin. Without further development in dental material technology and evidence of its efficacy, restorative materials should not be relied upon to support undermined occlusal enamel to a level comparable to that provided by sound dentin.

  14. Micro-computed tomographic analysis of progression of artificial enamel lesions in primary and permanent teeth after resin infiltration.

    Science.gov (United States)

    Ozgul, Betul Memis; Orhan, Kaan; Oz, Firdevs Tulga

    2015-09-01

    We investigated inhibition of lesion progression in artificial enamel lesions. Lesions were created on primary and permanent anterior teeth (n = 10 each) and were divided randomly into two groups with two windows: Group 1 (window A: resin infiltration; window B: negative control) and Group 2 (window A: resin infiltration + fluoride varnish; window B: fluoride varnish). After pH cycling, micro-computed tomography was used to analyze progression of lesion depth and changes in mineral density. Resin infiltration and resin infiltration + fluoride varnish significantly inhibited progression of lesion depth in primary teeth (P 0.05). Resin infiltration is a promising method of inhibiting progression of caries lesions.

  15. Prevalence of supernumerary teeth in permanent dentition among patients attending a dental college in South Kerala: A pilot study

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    Devi Gopakumar

    2014-01-01

    Full Text Available Background: Supernumerary teeth are excess number of teeth formed as a result of disturbances occurring during odontogenesis. The objective of the study was to investigate the prevalence of supernumerary teeth in permanent dentition among patients attending a dental college in South Kerala. Materials and Methods: In this study, 11,141 subjects attending the out-patient department of PMS College of Dental Science and Research, Thiruvananthapuram, Kerala were examined for supernumerary teeth like mesiodens, paramolars, distomolars, third premolars, second laterals, and odontomes during the period May 2012-May 2013. Ethical clearance was obtained from the institutional ethical committee for the study. Results: The study showed a prevalence of 0.39% and a sex distribution of M:F equal to 2:1. The incidence of supernumerary teeth found was as follows: mesiodens (0.14%, paramolars (0.13%, third premolar (0.04%, distomolar (0.03%, extralateral (0.02%, and odontome (0.03%. The male:female gender predilection was as follows: mesiodens (3:1, paramolars (1.3:1, third premolar (4:1, distomolar (1:2, and odontome (2:1. Conclusion: This study showed a 0.39% prevalence of supernumerary teeth in this population.

  16. Reasons for and patterns relating to the extraction of permanent teeth in a subset of the Saudi population

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    Aleisa K

    2013-07-01

    Full Text Available Khalil Alesia,1 Hesham S Khalil2 1Department of Prosthetic Dental Sciences, 2Department of Oral and Maxillofacial Surgery, College of Dentistry, King Saud University, Saudi Arabia Background: The purpose of this study was to investigate the reasons for and patterns of extraction of permanent teeth in a subset of the Saudi population. Methods: During a 3-month period, dentists were asked to record, using a specially designed survey form, the reasons for every extraction of a permanent tooth. The reasons for tooth extraction were assigned to different causes, ie, dental caries, periodontal disease, eruption problems, trauma, orthodontics, failed root canal treatment, and others. The data requested for each extraction were: patient age, gender, nationality, and type of tooth removed and the reason for its extraction. Results: The highest percentage of extractions was observed in young females aged 10–30 years. Presence of caries was observed to be the main reason for extraction (50.2% followed by orthodontic problems (18.2%, eruption problems (17.5%, and periodontal problems (8.2%. The most frequently extracted posterior teeth were the third mandibular molar (19.4%, the third maxillary molar (16.4%, the first maxillary premolar (13.2%, and the first mandibular molar (10.9%. Conclusion: Dental caries was found to be the most common reason for extraction of teeth. Molar teeth were found to be the most frequently extracted, with an increased number of extracted first premolars as a result of orthodontic treatment. The highest percentage of extractions was observed in young females aged 10–30 years. Keywords: extraction, Saudi, teeth, reasons, permanent

  17. A study of the interleukin-1 gene cluster polymorphisms and inflammatory external root resorption in replanted permanent teeth.

    Science.gov (United States)

    Bastos, J V; Côrtes, M I S; Silva, J F C; Goulart, E M A; Colosimo, E A; Gomez, R S; Dutra, W O

    2015-09-01

    To investigate whether single nucleotide polymorphisms (SNPs) within the interleukin-1 gene cluster (IL1) are associated with the occurrence and severity of inflammatory external root resorption (IERR) after replantation of avulsed permanent teeth. Indexes of IERR were radiographically assessed in 182 mature replanted permanent teeth from 146 patients at the onset of endodontic therapy. DNA was extracted from buccal mucosa cells and genotyped using TaqMan probes-based assays for the SNPs IL1A -889C/T (rs 180058), IL1B +3954C/T (rs1143634) and IL1RN +2018C/T (rs419598). Teeth were grouped into two categories: IERR absent to mild (indexes ≤ 4) and moderate to severe IERR (indexes > 4). Genetic variations in the IL1 gene cluster were tested for their effect on the occurrence and extension of IERR using the GEE model (generalized estimation equation). Patient's age at the moment of injury, timing of pulpectomy, extra-alveolar period and storage condition of the avulsed teeth was included as possible confounders. No association was found between SNPs IL1A -889C/T, IL1B +3954C/T (rs1143634) and IL1RN +2018C/T (rs419598) and IERR indexes. Timing of pulpectomy (OR 3.5 IC 95% 2.0-6.2 P < 0.001) and patient's age at the moment of trauma (OR 0.29 IC 95% 0.12-0.67 P = 0.004) significantly affected the risk of developing severe IERR. While timing of pulpectomy and patient's age at the moment of trauma were confirmed as important risk factors, SNPs within the IL1 gene cluster did not affect the susceptibility for IERR after replantation of permanent teeth. © 2014 International Endodontic Journal. Published by John Wiley & Sons Ltd.

  18. Teeth number anomalies in permanent dentition among non-syndromic dental patients.

    Science.gov (United States)

    Aslan, Belma Işik; Akarslan, Zühre Zafersoy

    2013-03-01

    The aim of this study was to establish teeth number anomalies in relation to gender, tooth type, location, distribution pattern and the association between frequently missing teeth among a group of dental patients in Turkey. A total of 378 non-syndromic patients (240 females and 138 males) with an age range of 7-45 (x +/- SD = 22.07 +/- 3.6) having evidence of absent or excess teeth were evaluated in the study. Pearson Chi-square, Fisher's exact, McNemar and Kappa coefficients were used for statistical analysis. 237 patients had a total of 546 congenitally missing teeth and 141 had 185 excess teeth. Congenitally missing teeth were more commonly seen rather than the presence of supernumerary teeth. Difference was determined in the frequent locations of congenital missing and supernumerary teeth. The most frequent missing tooth type was found to be the mandibular second premolar (26.6%), while the majority of supernumerary teeth were located in the anterior region of the maxillary arch (37.9%). Both teeth number anomalies were more commonly seen among females. In hypodontia cases the occurrence of symmetrical agenesis of laterals and second premolars in maxilla; centrals and second premolars in mandible was notable. Agenesis of mandibular centrals was found to be associated with maxillary lateral agenesis in males. Also higher prevalence of molar teeth agenesis was determined in the occurrence of at least 4 teeth agenesis. These findings will serve as information about the contemporary demographic pattern of teeth number anomalies among non-syndromic Turkish dental patients and can provide evidence that agenesis of some teeth symmetrically or together are the products of the same genetic mechanisms.

  19. Shear bond strength of three adhesive systems to enamel and dentin of permanent teeth

    Directory of Open Access Journals (Sweden)

    Niloofar Shadman

    2012-01-01

    Full Text Available Background and Aims: The purpose of this experimental study was to investigate the shear bond strength of three new adhesive systems to enamel and dentin of permanent human teeth using three new etch and rinse and self-etch adhesive systems.Materials and Methods: Sixty intact caries-free third molars were selected and randomly divided into 6 groups. Flat buccal and lingual enamel and dentin surfaces were prepared and mounted in the acrylic resin perpendicular to the plan of the horizon. Adhesives used in this study were Tetric N-Bond, AdheSE and AdheSE-One F (Ivoclar/Vivadent, Schaan, Liechtenstein. The adhesives were applied on the surfaces and cured with quartz tungsten halogen curing unit (600 mW/cm2 intensity for 20 s. After attaching composite to the surfaces and thermocycling (500 cycles, 5-55ºC, shear bond strength was measured using a universal testing machine at a crosshead speed of 0.5 mm/min. The failure modes were examined under a stereomicroscope. The data were statistically analyzed using T-test, one-way ANOVA, Tukey and Fisher's exact tests.Results: In enamel, Tetric N-Bond (28.57±4.58 MPa and AdheSE (21.97±7.6 MPa had significantly higher bond strength than AdheSE-One F (7.16±2.09 MPa (P0.05.Conclusion: Shear bond strength to dentin in Tetric N-Bond (etch and rinse system( was higher than self-etch adhesives (AdheSE and AdheSE-One F. The bond strength to enamel and dentin in two-step self-etch (AdheSE was higher than one-step self-etch (AdheSE-One F.

  20. Longevity of direct and indirect resin composite restorations in permanent posterior teeth: A systematic review and meta-analysis.

    Science.gov (United States)

    da Veiga, Ana Maria Antonelli; Cunha, Amanda Carneiro; Ferreira, Daniele Masterson Tavares Pereira; da Silva Fidalgo, Tatiana Kelly; Chianca, Thomaz Kauark; Reis, Kátia Rodrigues; Maia, Lucianne Cople

    2016-11-01

    The aim of this systematic review and meta-analysis was to assess the differences in clinical performance in direct and indirect resin composite restorations in permanent posterior teeth. PubMed, the Cochrane Library, Web of Science, Scopus, LILACS, BBO, ClinicalTrials.gov and SiGLE were searched without restrictions. We included randomized clinical trials (RCTs) that compared the clinical performance of direct and indirect resin composite restorations in Class I and Class II cavities in permanent teeth, with at least two years of follow-up. The risk of bias tool suggested by Cochrane Collaboration was used for quality assessment. After duplicate removal, 912 studies were identified. Twenty fulfilled the inclusion criteria after the abstract screening. Two articles were added after a hand search of the reference list of included studies. After examination, nine RCTs were included in the qualitative analysis and five were considered to have a 'low' risk of bias. The overall risk difference in longevity between direct and indirect resin composite restorations in permanent posterior teeth (p>0.05) at five-year follow-up was 1.494 [0.893-2.500], and regardless of the type of tooth restored, that of molar and premolars was 0.716 [0.177-2.888] at three-year follow-up. Based on the findings, there was no difference in longevity of direct and indirect resin composite restorations regardless of the type of material and the restored tooth. Contemporary dentistry is based on minimally invasive restorations. Any indication of a less conservative technique must have unquestionable advantages. In vitro and in vivo studies reveal contradictory evidence of the clinical performance of direct and indirect resin composite restorations in posterior teeth. Thus this study clarified this doubt. Copyright © 2016 Elsevier Ltd. All rights reserved.

  1. Long-term treatment outcomes in immature permanent teeth by revascularisation using MTA and GIC as canal-sealing materials: a retrospective study.

    Science.gov (United States)

    Peng, Chufang; Yang, Yuan; Zhao, Yuming; Liu, He; Xu, Zheng; Zhao, Dianhong; Qin, Man

    2017-11-01

    Pulp revascularisation with MTA sealing has been accepted as an alternative treatment for non-vital immature permanent teeth. Successful revascularisation cases with GIC sealing were also reported, but lack of long-term researches. To evaluate long-term outcomes of revascularisation using MTA and GIC as canal-sealing materials in non-vital immature permanent teeth. Clinical and radiographic data of 60 non-vital immature permanent teeth treated with revascularisation (36.8 ± 12.4 months of follow-up) were reviewed. Of these, 28 teeth were sealed with MTA, and 32 with GIC. Tooth survival, success rate, and increases in root length and dentine wall thickness were evaluated. Teeth in MTA group showed a similar survival rate (96%) to GIC group (100%). The success rate in MTA group (93%) was greater than that in GIC group (59%). Eight of fourteen failed teeth due to recurrent apical disease (seven teeth in GIC group and one in MTA group) achieved complete root development. There was no statistically significant difference in root length or dentine wall thickness increase between the groups. Long-term outcome of revascularisation in non-vital immature permanent teeth sealed with GIC was not as good as that with MTA. Although more recurrent apical disease developed, results on root development were acceptable in GIC sealed cases. © 2017 BSPD, IAPD and John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  2. Teeth Number Anomalies in Permanent Dentition among Non-Syndromic Dental Patients

    OpenAIRE

    Isik Aslan, Belma; Zafersoy Akarslan, Zühre

    2013-01-01

    The aim of this study was to establish teeth number anomalies in relation to gender, tooth type, location, distribution pattern and the association between frequently missing teeth among a group of dental patients in Turkey. A total of 378 non-syndromic patients (240 females and 138 males) with an age range of 7–45 (X±SD=22.07±3.6) having evidence of absent or excess teeth were evaluated in the study. Pearson Chi-square, Fisher’s exact, McNemar and Kappa coefficients were used for statisti...

  3. Knowledge of Saudi parents toward the emergency management of avulsed permanent teeth: A cross-sectional survey

    Directory of Open Access Journals (Sweden)

    Nadiya Mosfer S AlGhamdi

    2016-01-01

    Full Text Available Introduction: Traumatic dentoalveolar injuries are frequent in children, affecting teeth, their supporting structures, and adjacent soft tissues. Parents are among the first people to deal with tooth avulsion among children at home or at play. This study, therefore, aimed to examine parental knowledge and attitudes about avulsed permanent teeth and their emergency treatment in children. Materials and Methods: A cross-sectional study was carried out with 274 parents of children receiving care at KKU College of Dentistry, Abha. Informed consent was obtained after explaining the nature of the study and data were collected using a self-administered questionnaire. Data were entered in MS Excel Sheet, and descriptive statistics were obtained. Results: Sixty-one percent of the parents reported dental trauma at home or school. 67.2% were not aware of the steps to be taken in tooth avulsion. The percentage for the source of information for avulsed tooth was a dentist (38.8% and the internet (34.5%. 73.8% were unaware of the fact that permanent avulsed tooth can be replanted. 56.3% parents said that they would discard the knocked out tooth. Regarding knowledge about traumatic dental injuries 43.9% said it is imperative to know about it. Conclusion: This survey reflected the lack of awareness and adequate knowledge regarding the avulsed tooth. There is an imperative need for educating the parents regarding management of avulsed tooth permanent tooth.

  4. Posttraumatic Displacement Management: Lateral Luxation and Alveolar Bone Fracture in Young Permanent Teeth with 5 Years of Follow-Up

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    Heitor Marques Honório

    2015-01-01

    Full Text Available Dental trauma is an important public health problem due to high prevalence and associated limitations. The external impact accounting for trauma may result in different injury types to teeth and supporting structures. This paper describes a clinical case of tooth trauma in an 8-year-old patient exhibiting the displacement of three permanent teeth with open root apexes. Although the traumatic impact resulted in two injury types to teeth and supporting tissues (lateral luxation and alveolar bone fracture, the therapeutic approach was the same in both situations. The bone and teeth were repositioned by digital pressure, stabilized by semirigid splint, and followed up at every week. After six weeks, the splint was removed. At that moment, the clinical and radiographic findings indicated normal soft/hard tissues and absence of pulp/periodontal pathologies. At the fifth year of follow-up, the treatment success of the case was confirmed, although it has been observed that all lower incisors exhibited pulp obliteration as a consequence of the dental trauma.

  5. Frequency and distribution of developmental anomalies in the permanent teeth of a Turkish orthodontic patient population

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    Fatih Kazanci

    2011-06-01

    Conclusion: The prevalence of developmental dental anomalies was higher in females than males. Impacted teeth were the most common developmental dental anomaly in this Turkish orthodontic population, followed by hypodontia.

  6. Evaluation of Reasons of Permanent Teeth Extraction in Iranian People (2009

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    Kakoei S.

    2012-02-01

    Full Text Available Statement of Problem: Everyday, many people lose their teeth because of various reasons. Knowing the reasons of tooth extraction would help officials to make decisions for helping patients saving their teeth.Purpose: The aim of this study was to investigate the reasons of teeth extraction in dental clinics and some private offices in the city of Kerman in November 2009- February 2010.Materials and Method: In this cross-sectional study, the reasons of teeth extraction in 2076 teeth from 1500 patients selected by simple sampling from Kerman dental clinics were evaluated. Personal data such as gender, age, educational level, occupation, and family size as well as the main reason of tooth extraction (decay, periodontal diseases, prosthesis, tooth impaction, orthodontic reasons, and patient’s request and the type of tooth were collected by a checklist. Data were analyzed in SPSS, version 11.5 using χ² test.Results: The two main reasons of tooth extraction were dental caries (43.6% and patient request (30.6%, respectively. Overall, the first and third molars of the lower jaw were the most commonly extracted teeth. There was a significant relationship between gender and tooth extraction because of caries and orthodontic reasons ( p <0.0001. Meanwhile, the patients’ age had a significant relationship with most teeth extraction reasons ( p <0.0001. Except for patient’s request, educational level had a significant impact on other teeth extraction reasons ( p <0.0001. Conclusion: According to the results of this study, the most common reasons of tooth extraction were dental caries and patient request despite their restorability. Preventive programs and routine dental examination are recommended.

  7. Multiple Impacted Permanent and Supernumerary Teeth in the Anterior Mandible of Nonsyndromic Case: A Systematic Review and Multidisciplinary Approach to Management

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    Pushkar Gawande

    2015-01-01

    Full Text Available Multiple impacted permanent and supernumerary teeth have been associated with the syndromes and metabolic disorders. Approximately, 75% of all the supernumerary teeth are impacted and are asymptomatic. Consequently, most such teeth constitute casual findings in the context of routine X-ray studies. Lack of eruptive force and rotation of tooth buds may cause multiple impactions, and additional examinations may be necessary to exclude systemic and metabolic conditions. We present a rare nonsyndromic case with 11 multiple impacted teeth in the anterior mandible, with systematic literature review and multidisciplinary management.

  8. Outcomes of vital pulp therapy in permanent teeth with different medicaments based on review of the literature

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    Najmeh Akhlaghi

    2015-01-01

    Full Text Available Vital pulp therapy (VPT is a biologic and conservative treatment modality to preserve the vitality and function of the coronal or remaining radicular pulp tissue in vital permanent teeth. A search was conducted via the Cochrane database, PubMed, MEDLINE, and Ovid for any articles with the criteria for "pulp-capping," or "pulp-capping materials" and "VPT outcomes" from 1978 to mid 2014. All articles were evaluated and the valid papers were selected. The outcomes of various VPT techniques, including indirect pulp treatment, direct pulp treatment, partial pulpotomy, and complete pulpotomy in vital permanent teeth were extracted. Although various studies have different research approach, most studies noted a favorable treatment outcome. Mineral trioxide aggregate (MTA appears to be more effective than calcium hydroxide (Ca(OH 2 for maintaining long-term pulp vitality after indirect and direct pulp-capping. However, it seems that the success rate for partial pulpotomy and pulpotomy with Ca(OH 2 is similar to MTA.

  9. Outcomes of vital pulp therapy in permanent teeth with different medicaments based on review of the literature

    Science.gov (United States)

    Akhlaghi, Najmeh; Khademi, Abbasali

    2015-01-01

    Vital pulp therapy (VPT) is a biologic and conservative treatment modality to preserve the vitality and function of the coronal or remaining radicular pulp tissue in vital permanent teeth. A search was conducted via the Cochrane database, PubMed, MEDLINE, and Ovid for any articles with the criteria for “pulp-capping,” or “pulp-capping materials” and “VPT outcomes” from 1978 to mid 2014. All articles were evaluated and the valid papers were selected. The outcomes of various VPT techniques, including indirect pulp treatment, direct pulp treatment, partial pulpotomy, and complete pulpotomy in vital permanent teeth were extracted. Although various studies have different research approach, most studies noted a favorable treatment outcome. Mineral trioxide aggregate (MTA) appears to be more effective than calcium hydroxide (Ca(OH)2) for maintaining long-term pulp vitality after indirect and direct pulp-capping. However, it seems that the success rate for partial pulpotomy and pulpotomy with Ca(OH)2 is similar to MTA. PMID:26604953

  10. Apoptosis in the human periodontal membrane evaluated in primary and permanent teeth

    DEFF Research Database (Denmark)

    Bille, Marie-Louise Bastholm; Thomsen, Bjarke; Kjær, Inger

    2011-01-01

    for apoptosis and epithelial cells of Malassez in the periodontal membrane. All teeth examined were extracted in connection with treatment. Results. Apoptosis was seen in close proximity to the root surface and within the epithelial cells of Malassez. This pattern of apoptotis is similar in the periodontal...

  11. Longevity of posterior resin composite restorations in permanent teeth in Public Dental Health Service: a prospective 8 years follow up.

    Science.gov (United States)

    Pallesen, Ulla; van Dijken, Jan W V; Halken, Jette; Hallonsten, Anna-Lena; Höigaard, Ruth

    2013-04-01

    To investigate in a prospective follow up the longevity of posterior resin composites (RC) placed in permanent teeth of children and adolescents attending Public Dental Health Service. All posterior RC placed, in the PDHS clinics in the cities of Copenhagen and Frederiksberg in Denmark between November 1998 and December 2002, in permanent teeth of children and adolescents up to 18 years, were evaluated in an up to 8 years follow up. The endpoint of each restoration was defined, when repair or replacement was performed. Survival analyses were performed between subgroups with Kaplan-Meier analysis. The individual contribution of different cofactors to predict the outcome was performed with Cox regression analysis. Totally 2881 children with a mean age of 13.7 years (5-18) received 4355 RC restorations placed by 115 dentists. Eighty percent were placed in molars and 49% were Class I. Two percent of restorations with base material and 1% of the restorations without base material showed postoperative sensitivity (n.s.). Replacements were made in 406 and repairs in 125 restorations. Kaplan-Meier analysis showed a cumulative survival at 8 years of 84.3%, resulting in an annual failure rate of 2%. Lower patient age, more than one restoration per patient, placement of a base material and placement of RC: in molars, in cavities with high number of surfaces, in lower jaw teeth, showed all significant higher failure rates. Five variables had significant importance for the end point, replacement/repair of the resin composite restorations: age of patient, age of operator, jaw, tooth type and cavity size. Posterior RC restorations placed in children and adolescents in Public Dental Health clinics showed an acceptable durability with annual failure rates comparable with those of randomized controlled RC studies in adults. Copyright © 2012 Elsevier Ltd. All rights reserved.

  12. Radiographic and clinical outcomes of the treatment of immature permanent teeth by revascularization or apexification: a pilot retrospective cohort study.

    Science.gov (United States)

    Alobaid, Adel S; Cortes, Lina M; Lo, Jeffery; Nguyen, Thuan T; Albert, Jeffery; Abu-Melha, Abdulaziz S; Lin, Louis M; Gibbs, Jennifer L

    2014-08-01

    This retrospective cohort study compared clinical and radiographic outcomes of endodontic treatment performed in immature nonvital permanent teeth by apexification (calcium hydroxide or apical barrier with mineral trioxide aggregate) versus revascularization. A comprehensive chart review was performed to obtain a cohort of previously completed cases with recalls. Clinical and radiographic data were collected for 31 treated teeth (19 revascularization and 12 apexification) with an average follow-up time of 17 months and a recall rate of 63%. Tooth survival, success rate, and adverse events were analyzed. Changes in radiographic root length, width, and area were quantified. The majority of treated teeth survived throughout the study period, with 30 of 31 (97%) teeth surviving (18/19 [95%] revascularization and 12/12 apexification). Most cases were also clinically successful, with 27 of 31 (87%) meeting criteria for success (15/19 [78%] revascularization and 12/12 apexification; nonsignificant difference). A greater incidence of adverse events was observed in the revascularization group (8/19 [42%] vs 1/12 [11%] in apexification) (risk ratio = 5.1; P = .04; 95% confidence interval, 0.719-35.48). Although more revascularization cases than apexification cases showed an increase in radiographic root area and width, the effect was not statistically significant. In this study, revascularization was not superior to other apexification techniques in either clinical or radiographic outcomes. Studies with large subject cohorts and long follow-up periods are needed to evaluate outcomes of revascularization and apexification while accounting for important covariants relevant to clinical success. Copyright © 2014 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  13. Prehospital emergency management of avulsed permanent teeth: Knowledge and attitude of schoolteachers

    OpenAIRE

    Harkiran Kaur; Supreet Kaur; Hargundeep Kaur

    2012-01-01

    Context: Tooth avulsion is one of the most serious dental emergencies in children. Often these injuries occur in school and, therefore, the knowledge of schoolteachers regarding the appropriate measures to be taken immediately after tooth avulsion is crucial to good prognosis. Aims: The purpose of the present study was to evaluate schoolteachers′ knowledge and attitudes regarding immediate management of avulsed teeth in children. Materials and Methods: A total of 177 teachers from sev...

  14. Comparison of nanoleakage in composite restorations following application of self-etch and total-etch adhesives in primary and permanent teeth

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    Makarem A

    2007-01-01

    Full Text Available Background and Aim: Nanoleakage can cause discoloration around restoration margins, secondary caries, postoperative sensitivity and finally loss of restoration, thus adequate hybrid layer is of primary importance in prevention of nanoleakage in adhesive restorations. Because of structural differences between primary and permanent dentin, evaluation of nanoleakge in primary teeth is very important. The aim of this study was to evaluate the nanoleakage in composite restorations following application of self -etch and total-etch adhesives in primary and permanent teeth. Materials and Methods: In this experimental study, Cl V cavities were prepared in buccal surfaces of 20 extracted primary molars and 20 extracted premolars. Each group was divided into 2 subgroups: In group (A, Gluma One Bond and in group (B, iBond adhesive materials were applied. After silver nitrate staining, specimens were mesiodistally sectioned and polished and then SEM examination was carried out to measure the nanoleakage .Data were analyzed statistically using, ANOVA and Duncan tests with p<0.05 as the limit of significance. Results: Factors tested had no significant effect on each other. Primary teeth showed more nanoleakage than permanent teeth (P<0.05. Mean nanoleakage was significantly higher in cervical than occlusal margins (P<0.05 and also in iBond than in Gluma One Bond in primary teeth (P<0.05. In permanent teeth, the lowest nanoleakage was observed in Gluma One Bond. Conclusion: The result of this study indicates that the use of total etch dentin adhesives (Gluma One Bond in bonded restorations results in less nanoleakage in primary and permanent teeth.

  15. [The effects of different interventions on 12-year-old children's permanent teeth caries and filling rate in Shanghai Jiading district].

    Science.gov (United States)

    Zhang, Shu-yu; Dong, Hua; Yu, Ming

    2015-06-01

    To evaluate the effects of different interventions on 12-year-old children's permanent teeth caries and filling rates in Shanghai Jiading District. Six hundred and ninety-one 12-year-old children from 3 middle schools were randomly divided into 3 groups. The filling intervention group received filling of the permanent teeth free of charge for 3 years; The health education group received oral health education for 3 years; The control group only accepted oral examination for 3 years. The data was analyzed with SPSS 20.0 software package for X2 test. On the baseline, the permanent teeth caries rates of 3 groups were 32.10%, 35.56% and 36.84%, and the filling rates were 17.07%, 16.24% and 17.04%, respectively. After 1 year, permanent teeth caries rates of 3 groups were 35.92%, 42.26% and 44.50%, respectively. There was no significant difference among the 3 groups (P>0.05). The filling rates were 93.28%, 61.41%, and 16.67%, respectively. There was significant difference among the 3 groups (Pfilling rates were 93.66%, 61.51% and 17.28%, respectively. There were significant differences among the 3 groups (PFilling intervention and health education can significantly reduce the permanent teeth caries prevalence rate and improve permanent teeth caries filling rate of 12-year-old children. Furthermore, the effects of filling intervention were more significant than the health education intervention. Supported by Medical Research Project of Science and Technology Committee of Shanghai Jiading District (2014-KW-04).

  16. Eruption times and patterns of permanent teeth in school children of India

    Directory of Open Access Journals (Sweden)

    Ambika Lakshmappa

    2011-01-01

    Conclusion: The mean ages of eruption obtained from the present study are strikingly comparable with those of other investigators in different populations across the world. Since the current study involves a large sample of children, the data reported in this study could be used as standards when assessing permanent tooth eruption in Indian children.

  17. Survival of ART and amalgam restorations in permanent teeth of children after 6.3 years.

    NARCIS (Netherlands)

    Frencken, J.E.F.M.; Taifour, D.; Hof, M.A. van 't

    2006-01-01

    The null hypothesis tested was that there is no difference in the survival percentages of all restorations placed through the Atraumatic Restorative Treatment (ART) approach, with high-viscosity glass ionomer, and those produced through the traditional approach, with amalgam (TA), in the permanent d

  18. A study of the management of 55 traumatically intruded permanent incisor teeth in children.

    LENUS (Irish Health Repository)

    Stewart, C

    2009-01-01

    These were to examine the main presenting, treatment and outcome factors for intruded permanent incisors in children, the effect of apical development and degree of intrusion on decisions on repositioning, the effect of apical development status on the maintenance of pulp vitality and the time of pulp extirpation and to compare the decisions made to the advice given in existing clinical guidelines.

  19. Comparative evaluation of shear bond strength of two self-etching adhesives (sixth and seventh generation on dentin of primary and permanent teeth: An in vitro study

    Directory of Open Access Journals (Sweden)

    Yaseen S

    2009-03-01

    Full Text Available Aim: The present study was undertaken to compare and evaluate shear bond strength of two self-etching adhesives (sixth and seventh generation on dentin of primary and permanent teeth. Materials and Methods: Flat dentin surface of 64 human anterior teeth (32 primary and 32 permanent divided into four groups of 16 each. Groups A and C were treated with Contax (sixth generation, while groups B and D were treated with Clearfil S3 (seventh generation. A teflon mold was used to build the composite (Filtek Z-350 cylinders on the dentinal surface of all the specimens. Shear bond strength was tested for all the specimens with an Instron Universal Testing Machine. Data were statistically analyzed using one-way ANOVA for multiple group comparison, followed by student′s unpaired ′t′ test for group-wise comparison. Results: There was no statistically significant difference in shear bond strength among the study groups except that primary teeth bonded with Contax exhibited significantly lesser shear bond strength than permanent teeth bonded with Clearfil S3. Conclusion: This study revealed that Clearfil S3 could be of greater advantage in pediatric dentistry than Contax because of its fewer steps and better shear bond strength in dentin of both primary and permanent teeth.

  20. Long-term survival and vitality outcomes of permanent teeth following deep caries treatment with step-wise and partial-caries-removal: A Systematic Review.

    Science.gov (United States)

    Hoefler, Vaughan; Nagaoka, Hiroko; Miller, Craig S

    2016-11-01

    A systematic review was performed to compare the long-term survival of deep dentine caries-affected permanent teeth treated with partial-caries-removal (PCR) versus similar teeth treated with stepwise-caries-removal techniques (SWT). Clinical studies investigating long-term PCR and SWT outcomes in unrestored permanent teeth with deep dentine caries were evaluated. Failures were defined as loss of pulp vitality or restorative failures following treatment. PubMed, Web of Science, Dentistry and Oral Sciences Source, and Central databases were systematically searched. From 136 potentially relevant articles, 9 publications utilizing data from 5 studies (2 RCTs, and 3 observational case-series) reporting outcomes for 426 permanent teeth over two to ten years were analyzed. Regarding restorative failures, >88% success at two years for both techniques was reported. For loss of pulp vitality, observational studies reported >96% vitality at two years for each technique, while one RCT reported significantly higher vitality (pdeep dentine caries. Partial-caries-removal may result in fewer pulpal complications over a three year period than SWT, although claims of a therapeutic advantage are based on very few, limited-quality studies. Partial-caries-removal and SWT are deep caries management techniques that reduce pulp exposure risk. Permanent teeth with deep dentine caries treated with either technique have a high likelihood for survival beyond two years. Copyright © 2016 Elsevier Ltd. All rights reserved.

  1. Unerupted Primary Molar Teeth Positioned Inferior to the Permanent Premolar: A Case Report

    Directory of Open Access Journals (Sweden)

    A. Bagheri

    2012-01-01

    Full Text Available Primary tooth impaction is a rare finding during the development of primary dentition. Several factors contribute to the impaction of a deciduous tooth. This report describes the diagnosis and treatment of a 10-year-old boy who presented an impacted second primary mandibular molar. This tooth, located inferior to the second premolar together with an odontoma, was positioned superior to the premolar teeth. Treatment consisted of surgical removal of the impacted deciduoustooth and odontoma and placement of a passive lower lingual holdingarch. Periodic examination was indicated for follow- up. Early intervention was recommended to manage orofacial disfigurement and to avoid consequent problems.

  2. A comparative evaluation of four restorative materials to support undermined occlusal enamel of permanent teeth

    OpenAIRE

    Prabhakar A; Thejokrishna P; Kurthukoti A

    2006-01-01

    The purpose of this study was to test the support to undermined occlusal enamel provided by posterior restorative composite (FiltekTM P60, 3M Dental products USA), polyacid modified resin composite (F2000 compomer, 3M Dental products, USA.), radiopaque silver alloy-glass ionomer cement (Miracle Mix. GC Corp, Tokyo, Japan) and Glass Ionomer cement (Fuji IX GP). To test each material, 20 human permanent mandibular third molars were selected. The lingual cusps were removed and the dentin support...

  3. Histochemical changes of occlusal surface enamel of permanent teeth, where dental caries is questionable vs sound enamel surfaces.

    Science.gov (United States)

    Michalaki, M; Oulis, C J; Pandis, N; Eliades, G

    2016-12-01

    This in vitro study was to classify questionable for caries occlusal surfaces (QCOS) of permanent teeth according to ICDAS codes 1, 2, and 3 and to compare them in terms of enamel mineral composition with the areas of sound tissue of the same tooth. Partially impacted human molars (60) extracted for therapeutic reasons with QCOS were used in the study, photographed via a polarised light microscope and classified according to the ICDAS II (into codes 1, 2, or 3). The crowns were embedded in clear self-cured acrylic resin and longitudinally sectioned at the levels of the characterised lesions and studied by SEM/EDX, to assess enamel mineral composition of the QCOS. Univariate and multivariate random effect regressions were used for Ca (wt%), P (wt%), and Ca/P (wt%). The EDX analysis indicated changes in the Ca and P contents that were more prominent in ICDAS-II code 3 lesions compared to codes 1 and 2 lesions. In these lesions, Ca (wt%) and P (wt%) concentrations were significantly decreased (p = 0.01) in comparison with sound areas. Ca and P (wt%) contents were significantly lower (p = 0.02 and p = 0.01 respectively) for code 3 areas in comparison with codes 1 and 2 areas. Significantly higher (p = 0.01) Ca (wt%) and P (wt%) contents were found on sound areas compared to the lesion areas. The enamel of occlusal surfaces of permanent teeth with ICDAS 1, 2, and 3 lesions was found to have different Ca/P compositions, necessitating further investigation on whether these altered surfaces might behave differently on etching preparation before fissure sealant placement, compared to sound surfaces.

  4. Prevalence of dental caries in primary and permanent teeth and its relation with tooth brushing habits among schoolchildren in Eastern Saudi Arabia

    Science.gov (United States)

    Farooqi, Faraz A.; Khabeer, Abdul; Moheet, Imran A.; Khan, Soban Q.; Farooq, Imran; ArRejaie, Aws S.,

    2015-01-01

    Objectives: To determine the prevalence of dental caries in the primary and permanent teeth, and evaluate the brushing habits of school children in Dammam, Kingdom of Saudi Arabia (KSA). Methods: This study was conducted at Dammam, KSA. Oral examination of the participants was conducted from February to May 2014. The total sample size for this cross-sectional study was 711. There were 397 children between the age of 6-9 years, who were examined for primary teeth caries, and 314 between the age 10-12 years were examined for permanent teeth caries. Primary and permanent dentitions were studied for decayed, missing, and filled teeth (dmft [primary teeth], DMFT [permanent teeth]). Results: The overall prevalence of dental caries in primary and permanent teeth was almost 73% (n=711). Among the 6-9-year-old, the prevalence of caries was approximately 78% (n=397) whereas, among the 10-12-year-old children, it was approximately 68% (n=314). Mean dmft value among the 6-9-year-olds was 3.66±3.13 with decayed (d) component of 3.28±2.92, missing (m) component of 0.11±0.69, and filled (f) component of 0.26±0.9. Mean DMFT value among the 10-12-year-old children was 1.94±2.0 with decayed (D) component of 1.76±1.85, missing (M) component of 0.03±0.22, and filled (F) of component 0.15±0.73. Daily tooth brushing had a positive effect on caries prevention, and this effect was statistically significant for caries in primary teeth. Conclusion: Although the prevalence of dental caries in primary and permanent teeth was not found to be as high as other researchers reported from different cities of KSA, still the prevalence was high considering the World Health Organization future oral health goals. Awareness should be provided to students, as well as, teachers and parents regarding the importance of good brushing habits and regular dental visits. PMID:25987118

  5. Quantitative detection of Streptococcus mutans and bacteria of dental caries and no caries groups in permanent teeth from a north China population

    Institute of Scientific and Technical Information of China (English)

    WANG Zhan-yong; WANG Jian-qiu; ZHOU Yan; ZHAO Dong; XIAO Bai

    2012-01-01

    Background Streptococcus mutans (S.mutans) is the prime pathogen of dental caries.There are few reports that studied the relationship between S.mutans,bacteria and dental caries in permanent teeth when compared to those in primary teeth.This study aimed to detect S.mutans and bacteria of dental caries and non-caries groups in permanent teeth from a north China population by real-time polymerase chain reaction (PCR) and compare the relationship between the number of these bacteria and the prevalence of dental caries in permanent teeth.Methods Human saliva samples were collected from 142 subjects with permanent teeth.According to their dental tooth (DT),142 subjects were divided into a dental caries group (DT≥1) and a non-caries group (DT=0).With specific primers for S.mutans and 16S rRNA,the total number of S.mutans and total bacteria of 142 saliva samples were detected by real-time PCR and statistically analyzed.Results There was no significant difference between the detection rates of S.mutans (P=0.118) and medians of S.mutans (P=0.115).The ratio of S.mutans to total bacteria in people with dental caries was significantly higher than in those without caries (P <0.001),but the total number of bacteria in people with dental caries was significantly lower than in those without caries (P <0.001).Conclusions S.mutans had different effects on caries in the permanent teeth of several individuals from a north China population.The ratios of S.mutans to total bacteria in saliva detected by real-time PCR with Sm479F/R and 16S RNA primers were closely associated with the prevalence of dental caries in the same population.These assays may be useful for the assessment of an individual's risk of dental caries.

  6. In Vitro Evaluation of the Enamel Surface Hardness Reduction in Primary and Permanent Teeth Caused by Two Most Common Acidic Soft Drinks

    Directory of Open Access Journals (Sweden)

    Nozari A.

    2011-05-01

    Full Text Available Statement of Problem: Dental erosion is defined as the loss of tooth substance by chemical processes not involving bacteria. Dental erosion has been found to be a common cause of tooth wear. Clinically apparent erosion has been found to be related to dietary factors such as the acid content of the beverages.Purpose: Evaluation of enamel erosion in the primary and permanent teeth as the result of two most common acidic drinks produced in Iranian factories, Mirinda and Pepsi.Materials and Method: The outermost surfaces of 20 primary and 20 permanent teeth were polished flat by using the finest grade sandpaper and water in order to facilitate the proper measurement. The specimens were then prepared by cutting 3-4 mm of the buccal surface of teeth by diamond burs. The specimens were then rinsed with distilled water and stored in 100˚10 humidity before testing. The surface micro-hardness of each specimen was measured by micro vickers Hardness tester before, after 5 minutes, and 10 minutes exposure to fresh solution of each drink (10 teeth per test group. Mann-Whitney and Wilcoxon signed rank tests were used for the estatistical analysis.Results: The results showed that both drinks, Mirinda and Pepsi, produced significant surface hardness loss at 5 and 10 minutes of exposure time ( p =0.05. The amount of erosive effect was changed as the exposure time increased (change from 5 to 10 minutes. There was no statistically significant difference between the amounts of surface hardness loss in the primary and permanent enamel ( p >0.05. Conclusion: Both drinks may have almost similar but significant erosive effect on the primary and permanent enamel surfaces. Although there wasn’t any difference between erosive effect of the two beverages, this effect was increased with increase in time. The primary teeth enamel was not found to be more susceptibe to acidic beverage-induced erosion than the permanent teeth.

  7. Pit and fissure sealants versus fluoride varnishes for preventing dental decay in the permanent teeth of children and adolescents.

    Science.gov (United States)

    Ahovuo-Saloranta, Anneli; Forss, Helena; Hiiri, Anne; Nordblad, Anne; Mäkelä, Marjukka

    2016-01-18

    Most of the detected increment in dental caries among children and adolescents is confined to occlusal surfaces of posterior permanent molars. Dental sealants and fluoride varnishes are much used preventive options for caries. Although the effectiveness of sealants and fluoride varnishes for controlling caries as compared with no intervention has been demonstrated in clinical trials and summarised in systematic reviews, the relative effectiveness of these two interventions remains unclear. This review is an update of one first published in 2006 and last updated in 2010. Primary objective • To evaluate the relative effectiveness of fissure sealants compared with fluoride varnishes, or fissure sealants together with fluoride varnishes compared with fluoride varnishes alone, for preventing dental caries in the occlusal surfaces of permanent teeth of children and adolescents. Secondary objectives • To evaluate whether effectiveness is influenced by sealant material type and length of follow-up.• To document and report on data concerning adverse events associated with sealants and fluoride varnishes. We searched the following electronic databases: the Cochrane Oral Health Group Trials Register (to 18 December 2015), the Cochrane Central Register of Controlled Trials (CENTRAL) (2015, Issue 11), MEDLINE via Ovid (1946 to 18 December 2015) and EMBASE via Ovid (1980 to 18 December 2015). We also searched the US National Institutes of Health Trials Register (http://clinicaltrials.gov) and the World Health Organization (WHO) Clinical Trials Registry Platform for ongoing trials. We placed no restrictions on language or date of publication when searching electronic databases. We screened the reference lists of identified trials and review articles for additional relevant studies. We included randomised controlled trials with at least 12 months of follow-up comparing fissure sealants, or fissure sealants together with fluoride varnishes, versus fluoride varnishes for

  8. Effects of mesiodens on adjacent permanent teeth: a retrospective study in Korean children based on cone-beam computed tomography.

    Science.gov (United States)

    Kim, Yuhyun; Jeong, Taesung; Kim, Jiyeon; Shin, Jonghyun; Kim, Shin

    2017-07-08

    Mesiodens can be associated with several complications. The optimal age for treatment, however, remains controversial. To investigate the three-dimensional (3D) positions of mesiodens using cone-beam computed tomography (CBCT) and determine the association of eruption-related complications of mesiodens with these 3D positions and delayed development of the central incisors. In total, 293 Korean children (383 supernumerary teeth) aged 4-10 years with no history of orthodontic treatment were included. CBCT and panoramic radiography data for all patients were retrospectively investigated with regard to the 3D positions of mesiodens, apical maturity of the permanent first molars, delayed development of the central incisors relative to the apical maturity of the permanent first molars (Nolla's stage), and eruption-related complications of mesiodens. Eruption-related complications were not correlated with any 3D characteristic other than the 'within the arch' position of mesiodens, while they showed a significant correlation with delayed development of the central incisors (P Mesiodens caused eruption-related complications in 33.7% patients. Moreover, the risk of these complications was higher when mesiodens caused delayed development of the central incisors. These findings can aid clinicians in planning appropriate and timely treatment for mesiodens, with focus on minimising patient discomfort. © 2017 BSPD, IAPD and John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  9. Comparing the Effect of Different Voxel Resolutions for Assessment of Vertical Root Fracture of Permanent Teeth

    Directory of Open Access Journals (Sweden)

    Uzun

    2015-07-01

    Full Text Available Background The teeth with undiagnosed vertical root fractures (VRFs are likely to receive endodontic treatment or retreatment, leading to frustration and inappropriate endodontic therapies. Moreover, many cases of VRFs cannot be diagnosed definitively until the extraction of tooth. Objectives This study aimed to assess the use of different voxel resolutions of two different cone beam computerized tomography (CBCT units in the detection VRFs in vitro. Materials and Methods The study material comprised 74 extracted human mandibular single rooted premolar teeth without root fractures that had not undergone any root-canal treatment. Images were obtained by two different CBCT units. Four image sets were obtained as follows: 1 3D Accuitomo 170, 4 × 4 cm field of view (FOV (0.080 mm3; 2 3D Accuitomo 170. 6 × 6 cm FOV (0.125 mm3; 3 NewTom 3G, 6˝ (0.16 mm3 and 4 NewTom 3G, 9˝ FOV (0.25 mm3. Kappa coefficients were calculated to assess both intra- and inter-observer agreements for each image set. Results No significant differences were found among observers or voxel sizes, with high average Z (Az results being reported for all groups. Both intra- and inter-observer agreement values were relatively better for 3D Accuitomo 170 images than the images from NewTom 3G. The highest Az and kappa values were obtained with 3D Accuitomo 170, 4 × 4 cm FOV (0.080 mm3 images. Conclusion No significant differences were found among observers or voxel sizes, with high Az results reported for all groups.

  10. 年轻恒牙冠折露髓的序列治疗%Treatment of crown fracture dental pulpin exposure of young permanent teeth

    Institute of Scientific and Technical Information of China (English)

    王长皓

    2012-01-01

    Objective To observe the effect of different treatment in crown fracture on different period. Methods Totally 120 patients with 160 of teeth according to condition of crown fracture,79 teeth treated by partial pulpotomy,61 teeth treated by pulpotomy,20 teeth used apexifieation. Treatment failure 30 teeth were tteated by apexification. 110 teeth was pulpotomy success,50 teeth preserved,60 teeth used root canal therapy after root formation. Finally used permanent repair. Results In 120 patients with 160 teeth, 140 teeth used pulpotomy, success in 140 teeth, failure 30 teeth were treated by apexification. 50 teeth used apexification,sussess in 48 teeth,failure in 2 teeth. Conclusions Crown fracture dental pulpin exposure of young permanent teeth in a special period, at first we should consider root continued upgrowth, and consider the final repair. In this paper, 160 teeth of 120 patients, according to the different conditions, different period, adopting different treatments and team approach, preserved 158 teeth, failure in 2 teeth. Team approach in crown fracture dental pulpin exposure of young permanent teeth can achieve good therapeutic purposes.%目的 观察年轻恒牙冠折露髓后,根据冠折的不同情况,采取不同的治疗方案;不同时期,制定即刻治疗方案,过度治疗方案,最终治疗方案序列治疗的效果.方法 对首次就诊的120例160颗患牙,根据冠折情况,79颗采用部分冠髓切断术,61颗采用冠髓切断术,20颗采用根尖诱导成形术;对30颗采用牙髓切断术治疗失败者,改用根尖诱导成形;110颗牙髓切断术成功者,50颗保存牙髓,60颗牙根形成后行根管治疗.最终行永久修复.结果 120例160颗患牙,140颗牙髓切断术成功110颗,失败30颗改用根尖诱导成形术.根尖诱导成形术总计50颗患牙,成功48颗,失败2颗.结论 年轻恒牙处于特殊时期,冠折露髓后首先考虑牙根继续发育问题,还要考虑以后的最终修复.本文120例160

  11. A prospective 8-year follow-up of posterior resin composite restorations in permanent teeth of children and adolescents in Public Dental Health Service: reasons for replacement

    DEFF Research Database (Denmark)

    Pallesen, Ulla; van Dijken, Jan W.V.; Halken, Jette

    2014-01-01

    Objectives: the aim of the study was to investigate reasons for replacement and repair of posterior resin composite (RC) restorations placed in permanent teeth of children and adolescents attending Public Dental Health Service in Denmark. Material and method: all posterior RC placed consecutively...

  12. Dentist and practice characteristics associated with restorative treatment of enamel caries in permanent teeth

    DEFF Research Database (Denmark)

    Fellows, Jeffrey L; Gordan, Valeria V; Gilbert, Gregg H

    2014-01-01

    characteristics associated with restoration of enamel caries, while accounting for other factors. METHODS: Data from a National Dental Practice-Based Research Network observational study of consecutive restorations placed in previously unrestored permanent tooth surfaces and practice/demographic data from 229......PURPOSE: Current evidence in dentistry recommends non-surgical treatment to manage enamel caries lesions. However, surveyed practitioners report they would restore enamel lesions that are confined to the enamel. Actual clinical data were used to evaluate patient, dentist, and practice...... participating network dentists were combined. ANOVA and logistic regression, using generalized estimating equations (GEE) and variable selection within blocks, were used to test the hypothesis that patient, dentist, and practice characteristics were associated with variations in enamel restorations of occlusal...

  13. Distinguishing between enamel fluorosis and other enamel defects in permanent teeth of children

    Science.gov (United States)

    Sabokseir, Aira

    2016-01-01

    Background. The inconsistent prevalence of fluorosis for a given level of fluoride in drinking water suggests developmental defects of enamel (DDEs) other than fluorosis were being misdiagnosed as fluorosis. The imprecise definition and subjective perception of fluorosis indices could result in misdiagnosis of dental fluorosis. This study was conducted to distinguish genuine fluorosis from fluorosis-resembling defects that could have adverse health-related events as a cause using Early Childhood Events Life-grid method (ECEL). Methods. A study was conducted on 400 9-year-old children from areas with high, optimal and low levels of fluoride in the drinking water of Fars province, Iran. Fluorosis cases were diagnosed on the standardized one view photographs of the anterior teeth using Dean’s and TF (Thylstrup and Fejerskov) Indices by calibrated dentists. Agreements between examiners were tested. Early childhood health-related data collected retrospectively by ECEL method were matched with the position of enamel defects. Results. Using both Dean and TF indices three out of four dentists diagnosed that 31.3% (115) children had fluorosis, 58.0%, 29.1%, and 10.0% in high (2.12–2.85 ppm), optimal (0.62–1.22 ppm), and low (0.24–0.29 ppm) fluoride areas respectively (p < 0.001). After matching health-related events in the 115 (31.3%) of children diagnosed with fluorosis, 31 (8.4%) of children had fluorosis which could be matched with their adverse health-related events. This suggests that what was diagnosed as fluorosis were non-fluoride related DDEs that resemble fluorosis. Discussion. The frequently used measures of fluorosis appear to overscore fluorosis. Use of ECEL method to consider health related events relevant to DDEs could help to differentiate between genuine fluorosis and fluorosis-resembling defects. PMID:26966672

  14. Distinguishing between enamel fluorosis and other enamel defects in permanent teeth of children

    Directory of Open Access Journals (Sweden)

    Aira Sabokseir

    2016-02-01

    Full Text Available Background. The inconsistent prevalence of fluorosis for a given level of fluoride in drinking water suggests developmental defects of enamel (DDEs other than fluorosis were being misdiagnosed as fluorosis. The imprecise definition and subjective perception of fluorosis indices could result in misdiagnosis of dental fluorosis. This study was conducted to distinguish genuine fluorosis from fluorosis-resembling defects that could have adverse health-related events as a cause using Early Childhood Events Life-grid method (ECEL. Methods. A study was conducted on 400 9-year-old children from areas with high, optimal and low levels of fluoride in the drinking water of Fars province, Iran. Fluorosis cases were diagnosed on the standardized one view photographs of the anterior teeth using Dean’s and TF (Thylstrup and Fejerskov Indices by calibrated dentists. Agreements between examiners were tested. Early childhood health-related data collected retrospectively by ECEL method were matched with the position of enamel defects. Results. Using both Dean and TF indices three out of four dentists diagnosed that 31.3% (115 children had fluorosis, 58.0%, 29.1%, and 10.0% in high (2.12–2.85 ppm, optimal (0.62–1.22 ppm, and low (0.24–0.29 ppm fluoride areas respectively (p < 0.001. After matching health-related events in the 115 (31.3% of children diagnosed with fluorosis, 31 (8.4% of children had fluorosis which could be matched with their adverse health-related events. This suggests that what was diagnosed as fluorosis were non-fluoride related DDEs that resemble fluorosis. Discussion. The frequently used measures of fluorosis appear to overscore fluorosis. Use of ECEL method to consider health related events relevant to DDEs could help to differentiate between genuine fluorosis and fluorosis-resembling defects.

  15. Prediction of Facial Profile Based on Morphometric Measurements and Profile Characteristics of Permanent Maxillary Central Incisor Teeth

    Directory of Open Access Journals (Sweden)

    N Raghavendra

    2015-01-01

    Full Text Available The computation of facial profile from dental morphometrics has been a subject of great interest in forensic odontology. The use of teeth to draw a profile and facial features is valuable in times of mass disasters when body remains are unavailable due to extreme destruction. This study aims to identify and evaluate applicable parameters in the permanent maxillary central incisors and the face of an individual. A correlation of these parameters establishes a mathematical equation that further charts a tooth-facial profile table. Thirty soft and hard tissue landmarks on the face in the frontal and the lateral profiles (using standardized photographs and seven landmarks on the facial/labial surface of the clinical crown of the permanent maxillary central incisor (using casts of the maxilla were identified for the study. Based on these, a set of eight horizontal and seven vertical parameters on the face and four parameters on the tooth were created for the assessment. Internal and external correlations between the two were carried out and statistically analyzed. A logistic regression was made to predict the probability of the parameters most likely to be reproduced in the creation of the facial profile, based on tooth morphometrics. The results indicated a definite correlation between the facial and the tooth parameters. Among the multiple parameters, a definite correlation in the horizontal dimension could be established between the mouth width and the mesiodistal width (MDW of the tooth. In the vertical dimension, a definite relationship existed between the crown height of the tooth and the width of the midface (zygoma-mandible. There exist divergences in the correlation of tooth and facial parameters.

  16. 恒牙全脱位再植的研究现状%Present Studies of Replantation of Avulsed Permanent Teeth

    Institute of Scientific and Technical Information of China (English)

    钱瀚宇; 丁允鹏

    2015-01-01

    Permanent teeth are prone to avulsion by trauma.Replantation is the preferred treatment for avulsed perma-nent teeth, and the ideal prognosis of replantation is to achieve functional healing of periodontal ligament. If the avulsed teeth are immature, revascularization of the dental pulp is expected. The duration of extra-alveolar time, preservation of the root and storage media of the tooth, all of which determine the prognosis for dental replantation, but the current prognosis is not satisfactory. Present studies of replantation of avulsed permanent teeth were reviewed in the present paper.%恒牙外伤常导致牙齿全脱位,再植术是恒牙全脱位的首选治疗方法. 理想的预后是实现牙周功能性愈合,若牙根尖未完全封闭,尚有牙髓再生的可能. 恒牙再植术的预后与很多因素有关,如牙齿脱离牙槽窝的时间、牙根的保存以及牙齿的储存介质等,目前临床治疗效果尚不理想. 本文就恒牙全脱位再植的研究现状作一综述.

  17. CCL3 and CXCL12 production in vitro by dental pulp fibroblasts from permanent and deciduous teeth stimulated by Porphyromonas gingivalis LPS

    Directory of Open Access Journals (Sweden)

    Carla Renata Sipert

    2013-04-01

    Full Text Available Objective: The aim of this study was to compare the production of the chemokines CCL3 and CXCL12 by cultured dental pulp fibroblasts from permanent (PDPF and deciduous (DDPF teeth under stimulation by Porphyromonas gingivalis LPS (PgLPS. Material and Methods: Primary culture of fibroblasts from permanent (n=3 and deciduous (n=2 teeth were established using an explant technique. After the fourth passage, fibroblasts were stimulated by increasing concentrations of PgLPS (0 – 10 µg/mL at 1, 6 and 24 h. The cells were tested for viability through MTT assay, and production of the chemokines CCL3 and CXCL12 was determined through ELISA. Comparisons among samples were performed using One-way ANOVA for MTT assay and Two-way ANOVA for ELISA results. Results: Cell viability was not affected by the antigen after 24 h of stimulation. PgLPS induced the production of CCL3 by dental pulp fibroblasts at similar levels for both permanent and deciduous pulp fibroblasts. Production of CXCL12, however, was significantly higher for PDPF than DDPF at 1 and 6 h. PgLPS, in turn, downregulated the production of CXCL12 by PDPF but not by DDPF. Conclusion: These data suggest that dental pulp fibroblasts from permanent and deciduous teeth may present a differential behavior under PgLPS stimulation.

  18. Detent Force Reduction of a C-Core Linear Flux-Switching Permanent Magnet Machine with Multiple Additional Teeth

    Directory of Open Access Journals (Sweden)

    Yi Du

    2017-03-01

    Full Text Available C-core linear flux-switching permanent magnet (PM machines (LFSPMs are attracting more and more attention due to their advantages of simplicity and robustness of the secondary side, high power density and high torque density, in which both PMs and armature windings are housed in the primary side. The primary salient tooth wound with a concentrated winding consists of C-shaped iron core segments between which PMs are sandwiched and the magnetization directions of these PMs are adjacent and alternant in the horizontal direction. On the other hand, the secondary side is composed of a simple iron core with salient teeth so that it is very suitable for long stroke applications. However, the detent force of the C-core LFSPM machine is relatively high and the magnetic circuit is unbalanced due to the end effect. Thus, a new multiple additional tooth which consists of an active and a traditional passive additional tooth, is employed at each end side of the primary in this paper, so that the asymmetry due to end effect can be depressed and the detent force can be reduced by adjusting the passive additional tooth position. By using the finite element method, the characteristics and performances of the proposed machine are analyzed and verified.

  19. Comparison of the Remaining Tooth Structure and Fracture Resistance between Labial and Lingual Access Cavities in Permanent Anterior Teeth with Labial Caries: An In-vitro Study

    Directory of Open Access Journals (Sweden)

    Eftekhar B.

    2012-02-01

    Full Text Available Statement of Problem: Labial access cavity preparation is a conventional method in endodontic treatment of the anterior teeth, but in some conditions labial cavity preparation is recommended.Purpose: The aim of this study was to compare labial and lingual access cavity preparation in the permanent anterior teeth with labial caries in terms of the remaining tooth structure and fracture resistance. Materials and Method: In this experimental study, 150 intact permanent human anterior teeth were selected in 5 groups each with 30 teeth including the maxillary central, maxillary lateral, maxillary canine, mandibular incisors and mandibular canine. A class V cavity with similar ratios to dimensions of each tooth was prepared on the labial surface of all specimens. The volumes of each of these teeth were measured by Penta Pycnometer before and after class V cavity preparation (V1, V2. Each group was randomly divided into 2 equal subgroups (n=15. Access cavities were prepared labially in subgroup A and lingually in subgroup B; then, the remained volume of each tooth was measured again (V3. The mean proportional volume loss of each tooth was calculated through access preparation (V2-V3/V1. Then, the specimens were embedded in acrylic resin blocks and subjected to load with a universal testing machine.Results: The differences of mean of theremained volume and fracture resistance of the two subgroups were statistically significant in all groups ( p <0.05 and those teeth with labial access showed more remained volume and fracture resistance than lingual access. Conclusion: Labial access cavity preparation can enhance the remained volume and fracture resistance as compared to lingual access in endodontic treatment of the anterior teeth with labial caries especially in mandibular incisors.

  20. [Multiple retained deciduous teeth: a case report].

    Science.gov (United States)

    Wang, Jing; Lai, Wen-Li

    2009-06-01

    Retained deciduous teeth are defined as the succedaneous permanent teeth have erupted while the primary teeth were retained, or the permanent teeth unerupted while the primary teeth remained in the permanent dentition. One case of multiple retained deciduous teeth was reported.

  1. Influence of effective number of pulses on the morphological structure of teeth and bovine femur after femtosecond laser ablation.

    Science.gov (United States)

    Nicolodelli, Gustavo; Lizarelli, Rosane de Fátima Zanirato; Bagnato, Vanderlei Salvador

    2012-04-01

    Femtosecond lasers have been widely used in laser surgery as an instrument for contact-free tissue removal of hard dental, restorative materials, and osseous tissues, complementing conventional drilling or cutting tools. In order to obtain a laser system that provides an ablation efficiency comparable to mechanical instruments, the laser pulse rate must be maximal without causing thermal damage. The aim of this study was to compare the different morphological characteristics of the hard tissue after exposure to lasers operating in the femtosecond pulse regime. Two different kinds of samples were irradiated: dentin from human extracted teeth and bovine femur samples. Different procedures were applied, while paying special care to preserving the structures. The incubation factor S was calculated to be 0.788±0.004 for the bovine femur bone. These results indicate that the incubation effect is still substantial during the femtosecond laser ablation of hard tissues. The plasma-induced ablation has reduced side effects, i.e., we observe less thermal and mechanical damage when using a superficial femtosecond laser irradiation close to the threshold conditions. In the femtosecond regime, the morphology characteristics of the cavity were strongly influenced by the change of the effective number of pulses.

  2. Dental trauma. Combination injuries 3. The risk of pulp necrosis in permanent teeth with extrusion or lateral luxation and concomitant crown fractures without pulp exposure

    DEFF Research Database (Denmark)

    Lauridsen, Eva Fejerskov; Hermann, Nuno Vibe; Gerds, Thomas Alexander;

    2012-01-01

    Aim: To analyze the influence of a crown fracture without pulp exposure on the risk of pulp necrosis (PN) in teeth with extrusion or lateral luxation. Material and methods: The study included 82 permanent incisors with extrusion from 78 patients (57 male, 21 female) and 179 permanent incisors......, and response to electric pulp test at the initial examination. Results: A concomitant crown fracture significantly increased the risk of PN in teeth with lateral luxation. For teeth with immature root development (hazard ratio: 10 [95% confidence interval (CI): 1.1–100] P = 0.04), the overall risk increased...... increased from 56.5% (95% CI: 37.7–75.4) to 76.5% (95% CI: 58.9–94) in case of a concomitant crown fracture, but the difference was not statistically significant (P > 0.05). Conclusion: A concomitant crown fracture without pulp exposure significantly increased the risk of PN in teeth with lateral luxation...

  3. Study of Root Canal Anatomy in Human Permanent Teeth in A Subpopulation of Brazil's Center Region Using Cone-Beam Computed Tomography - Part 1.

    Science.gov (United States)

    Estrela, Carlos; Bueno, Mike R; Couto, Gabriela S; Rabelo, Luiz Eduardo G; Alencar, Ana Helena G; Silva, Ricardo Gariba; Pécora, Jesus Djalma; Sousa-Neto, Manoel Damião

    2015-10-01

    The aim of this study was to evaluate the frequency of roots, root canals and apical foramina in human permanent teeth using cone beam computed tomography (CBCT). CBCT images of 1,400 teeth from database previously evaluated were used to determine the frequency of number of roots, root canals and apical foramina. All teeth were evaluated by preview of the planes sagittal, axial, and coronal. Navigation in axial slices of 0.1 mm/0.1 mm followed the coronal to apical direction, as well as the apical to coronal direction. Two examiners assessed all CBCT images. Statistical data were analyzed including frequency distribution and cross-tabulation. The highest frequency of four root canals and four apical foramina was found in maxillary first molars (76%, 33%, respectively), followed by maxillary second molars (41%, 25%, respectively). The frequency of four root canals in mandibular first molars was 51%. Mandibular first premolars had two root canals and two apical foramina in 29% and 20% of the cases, respectively. Mandibular central and lateral incisors and canines presented two root canals in 35%, 42% and 22% of the cases, respectively. The navigation strategy in CBCT images favors a better identification of frequency and position of roots, root canals and apical foramina in human permanent teeth.

  4. Replantation of avulsed permanent teeth:an analysis of 32 cases%外伤脱位牙再植后的临床疗效分析

    Institute of Scientific and Technical Information of China (English)

    张月云; 徐龙博

    2011-01-01

    AIM: To analyze the factors influencing the effects of tooth replantation of avulsed permanent teeth.METHODS : Twenty-six children with 32 avulsed permantent teeth were enrolled in this study.The avulsed permantent teeth were replantated in the Department of Pediatric Dentistry, Jining Stomatology Hospital, in the years between 2004 and 2008.The patients were followed up regularly for 2 to 3 years.RESULTS : During the follow-up period, periodontal ligament healing was observed in 4/32, replacement resorption in 23/32, inflammatory resorption in 3/32 and odontoptosis in 2/32 teeth.The success rate of replatation was 84.37%.CONCLUSION: The replantation of young permanent teeth showed a higher success rate.The success of replantation was related to ex vivo time,storage medium and root development stage of the avulsed teeth.%目的:研究探讨影响再植牙临床疗效的相关因素.方法:对2004-2008到我院儿童牙病科就诊的26例8~14岁患儿32个外伤牙进行常规再植,术后定期复查,观察时间2~3年.结果:观察期内,32个外伤恒牙中牙周膜愈合4个,替代性吸收23个,炎症性吸收3个,松动脱落2个.成功率为84.37%.结论:年轻恒牙再植后的成功率较高,但与脱位牙离体时间、保存方式及牙根的发育程度等因素有密切关系.

  5. In vitro antimicrobial activity of sodium hypochlorite, chlorhexidine gluconate and octenidine dihydrochloride in elimination of microorganisms within dentinal tubules of primary and permanent teeth.

    Science.gov (United States)

    Tirali, Resmiye-Ebru; Bodur, Haluk; Ece, Gülden

    2012-05-01

    The aim of this study was to evaluate the effectiveness of different irrigation solutions at different time intervals for the elimination of E. faecalis and C. albicans penetrated into the dentine tubules of primary and permanent teeth in vitro. The 4 mm primary and permanent teeth sections were sterilized and contaminated with a mixture of E. faecalis and C. albicans strains. After the application of different irrigation solutions (Sodium hypochlorite, Chlorhexidine gluconate, Octenidine Dihydrochloride, saline) to the contaminated tooth sections according to study groups, neutralizers were applied for inactivation of the solutions after 30 sec, 1 min and 5 min. Dentine shavings were placed into TSB and 10 µL from each tube was inoculated on agar plates, followed by an incubation period of 24 h at 37°C. The colonies were counted macroscopically. The results were compared by using Kruskal-Wallis and Mann Whitney U tests, with a significance level at pOctenidine Dihydrochloride. The antibacterial effects of the tested solutions on the same time periods against C. albicans revealed no significant difference. There were no statistically significant differences between primary and permanent teeth with respect to the antimicrobial activity of the tested solutions. Moreover, Octenidine Dihydrochloride may be used as an alternative endodontic irrigant.

  6. In vitro antimicrobial activity of Sodium hypochlorite, Chlorhexidine gluconate and Octenidine Dihydrochloride in elimination of microor- ganisms within dentinal tubules of primary and permanent teeth

    Science.gov (United States)

    Bodur, Haluk; Ece, Gülden

    2012-01-01

    The aim of this study was to evaluate the effectiveness of different irrigation solutions at different time intervals for the elimination of E.faecalis and C.albicans penetrated into the dentine tubules of primary and permanent teeth in vitro. The 4 mm primary and permanent teeth sections were sterilized and contaminated with a mixture of E.faecalis and C.albicans strains. After the application of different irrigation solutions (Sodium hypochlorite, Chlorhexidine gluconate, Octenidine Dihydrochloride, saline) to the contaminated tooth sections according to study groups, neutralizers were applied for inactivation of the solutions after 30 sec, 1 min and 5 min. Dentine shavings were placed into TSB and 10µL from each tube was inoculated on agar plates, followed by an incubation period of 24h at 37°C. The colonies were counted macroscopically. The results were compared by using Kruskal-Wallis and Mann Whitney U tests, with a significance level at pOctenidine Dihydrochloride. The antibacterial effects of the tested solutions on the same time periods against C.albicans revealed no significant difference. There were no statistically significant differences between primary and permanent teeth with respect to the antimicrobial activity of the tested solutions. Moreover, Octenidine Dihydrochloride may be used as an alternative endodontic irrigant. Key words:Chlorhexidine gluconate, dentine tubules, irrigation solutions, Octenidine Dihydrochloride, Sodium hypochlorite. PMID:22143724

  7. [What is the relation between the presence of caries in the deciduous dentition and the chronology of the eruption of the permanent teeth?].

    Science.gov (United States)

    Leroy, Roos; Declerck, Dominique

    2004-01-01

    Based on data obtained from a prospective epidemiological study in a random sample of 4468 Flemish children, accurate emergence ages for permanent teeth could be established. When data on permanent tooth emergence in different populations are compared, differences are most pronounced for premolars. Several authors hypothesised that this difference could be explained by a difference in caries experience in the primary molars. The purpose of this study was to quantify the effect of caries experience in a primary molar on the timing of emergence of its successor. The results indicate that the emergence of the premolars was accelerated by 2 to 8 months when its predecessor had been decayed and or filled but had not been extracted. Premature loss of maxillary primary molars resulted in a significant acceleration of the emergence of the premolars; this was not observed in the mandible. In conclusion, when considering permanent tooth emergence ages, caries experience in the primary dentition should be taken into account.

  8. CBVT analysis of canal configuration of the mesio-buccal root of maxillary first permanent molar teeth: An in vitro study

    Directory of Open Access Journals (Sweden)

    R Pratima Shenoi

    2012-01-01

    Full Text Available Context: For successful endodontic treatment, it′s imperative to locate and obturate all root canals. As concluded by Ingle, the major cause for failure of root canal therapy is in ability to recognize all theexisting canals and subsequent failure in their obturation. Aim: To analyze the canal configuration of the mesio-buccal root of maxillary first permanent molar teeth. Materials and Methods: A total of 30 recently extracted human permanent maxillary first molars were collected and stored in a container with 5% Sodium Chloride solution for four days. Teeth with open apices, external resorption, improperly formed roots and teeth with previous restorations were excluded. Using the dental modeling wax, teeth were arranged in a ′U′ shaped arch with roots embedded inside the wax and occlusal surface remaining free. 10 teeth were arranged in each arch and three such sample plates were prepared. Flat surface of the base encasing enabled the plate to be mounted on flat plastic bite plate. With bite plate roughly centered in the focal trough area Axial, Coronal and Sagittal section Cone-Beam Computed Tomography (CBCT images were taken with Kodak 9000 Extra-oral Imaging System. Images displayed on a monitor were inspected by two endodontists using Kodak Dental Imaging Software 3D Module V2.2. Statistical Analysis: When the data was observed, it was found that 24 teeth out of total 30 teeth examined showed some variation (i.e. possible additional canal along the length of the mesio-buccal root canal. Out of these 24 teeth, 13 showed presence of additional canal at coronal third, 7 showed presence of additional canal at middle third and four showed presence of additional canal in apical third level. Percentage analysis was done as there was no group comparison to be done. Results: Cone-Beam Volumetric Tomography (CBVT evaluation positively identified the variations in mesio-buccal canal in 80% of samples. Out of these, 54.16% were in coronal 3 rd

  9. Traumatic intrusion of permanent teeth. Part 2. A clinical study of the effect of preinjury and injury factors, such as sex, age, stage of root development, tooth location, and extent of injury including number of intruded teeth on 140 intruded permanent teeth.

    Science.gov (United States)

    Andreasen, Jens Ove; Bakland, Leif K; Andreasen, Frances Meriam

    2006-04-01

    A prospective study of 140 intruded permanent teeth was done to evaluate the following healing complications: pulp necrosis (PN), root resorption (surface, inflammatory and replacement resorption) (RR) and defects in marginal periodontal healing (MA). These complications were related to various preinjury and injury factors. Age appeared to be related to all three healing complications in that patients younger than 12 years had the lowest complication rate. Stage of root formation at the time of the injury was very strongly related to PN and MA, with immature root formation (i.e. incomplete root formation or completed root formation with wide open apex) having better prognosis than more mature root development. Lateral incisors showed significantly more defects in MA, a finding possibly explained by the observation that lateral incisors were more often involved in multiple intrusions compared to other teeth and noting that multiple intrusions had a significantly higher frequency of MA. An associated crown fracture with exposed dentin resulted in more frequent PN, a finding possibly related to bacterial invasion through dentinal tubules into an ischemic pulp. The presence of a gingival laceration added to both PN and MA. The extent of intrusion (in mm) showed some relation to both RR with intrusion 1-3 mm having the lowest frequency of RR, whereas PN and MA showed no significant relation to the extent of intrusion. Finally, multiple adjacent intruded teeth were more frequently involved in a significantly greater loss of interproximal marginal bone (MA) than single intrusions. In conclusion, the relationship between healing complications and preinjury and injury factors could generally be explained by better healing possibilities in teeth with immature root formation. A possible explanation for that could be the softer bone surrounding the tooth, whereby trauma to the periodontium might be diminished.

  10. Anomalous findings of number, morphology and size of permanent teeth in 7-10 years children living in the Czech Republic.

    Science.gov (United States)

    Ginzelová, K; Kripnerová, T; Dostálová, T

    2013-01-01

    6,043 children, who were ordinary patients and children of Caucasian population, were examined clinically and radiographically. 430 children were aged 7-10 years. Dental anomalies were diagnosed in 14.1% (61 children) of those observed between 7-10 years. We aimed at numerical anomalies (78.6% of children with anomalies), morphological anomalies (19.6% of children with anomalies), size anomalies (3.2% of children with anomalies) and combinations of diagnoses (1.4% reflects the combinations of teeth 2 times calculated in combinations of diagnoses). Congenital numerical variations, i.e. hypodontia and hyperodontia, are among the most common deviations of the permanent dentition. Both conditions can occur as isolated traits or in association with other syndromes. Many studies indicate that hereditary factors are involved in the aetiology of anomalies. Gen MSX1 involves a primary position in mediating interactions between epithelium and mesenchyme in the development of teeth. Occurrence of dental anomalies is not very frequent; problems can arise with diagnosis of those affected teeth. It can be done using Orthopantomogram or Computed Tomography and 3D reconstruction. Some of the children with anomalies may have difficulties in treatment of affected teeth but in most cases the prognosis is good.

  11. Dental fluorosis in children in areas with fluoride-polluted air, high-fluoride water, and low-fluoride water as well as low-fluoride air: A study of deciduous and permanent teeth in the Shaanxi province, China

    Energy Technology Data Exchange (ETDEWEB)

    Ruan, J.P.; Bardsen, A.; Astrom, A.N.; Huang, R.Z.; Wang, Z.L.; Bjorvatn, K. [University of Bergen, Bergen (Norway). Dept. of Oral Science

    2007-07-01

    The aim of the study was to assess dental fluorosis (DF) in the deciduous and permanent teeth of children in areas with high-F coal (area A) and high-F water (area C) compared to children from area B, with low-F water and coal. DF was found to be prevalent in both dentitions in areas A and C. Similarity in percentages of DF may indicate that indoor air with about to 60 {mu}g F/m{sup 3} and drinking water with 3.6 mg F/L are similarly toxic to developing permanent teeth. The percentage of deciduous teeth with DF was significantly lower in area A compared to area C. Where low-F coal and low-F water were used (area B), similar to 20% of permanent teeth had DF, indicating a relatively low tolerance to fluoride in Chinese children brought up under the present living conditions.

  12. In Vitro Evaluation of the Enamel Surface Hardness Reduction in Primary and Permanent Teeth Caused by Two Most Common Acidic Soft Drinks

    OpenAIRE

    2011-01-01

    Statement of Problem: Dental erosion is defined as the loss of tooth substance by chemical processes not involving bacteria. Dental erosion has been found to be a common cause of tooth wear. Clinically apparent erosion has been found to be related to dietary factors such as the acid content of the beverages.Purpose: Evaluation of enamel erosion in the primary and permanent teeth as the result of two most common acidic drinks produced in Iranian factories, Mirinda and Pepsi.Materials and Meth...

  13. An in vitro evaluation of the demineralization inhibitory effect of F− varnish and casein phosphopeptide-amorphous calcium phosphate on enamel in young permanent teeth

    Science.gov (United States)

    Duraisamy, Vinola; Xavier, Ananda; Nayak, Ullal Anand; Reddy, Venugopal; Rao, Arun Prasad

    2015-01-01

    Aims and Objectives: To determine the demineralization inhibitory potential of fluoride varnish and casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and to compare and evaluate the additive effect of fluoride varnish + CPP-ACP. Materials and Methods: Ten healthy premolar teeth that were extracted for orthodontic purposes were collected, and each tooth was longitudinally sectioned buccolingually and mesiodistally into four sections. The teeth were then assigned to four different treatment groups namely fluoride varnish, CPP-ACP, F− varnish followed by CPP-ACP and control. The prepared enamel samples were suspended in an artificial caries challenge for 10 days. The demineralizing inhibitory effects of the groups were recorded using polarized light microscopy. Statistical Analysis Used: Statistical analysis was carried out using analysis of variance and Duncan's multiple range tests. Results: The mean lesion depths of all the groups were Group 1 (fluoride varnish): 104.71, Group 2 (CPP-ACP): 127.09, Group 3: (F− varnish + CPP-ACP): 82.34, Group 4 (control): 146.93. Conclusion: Demineralization inhibitory potential on the additive use of F− varnish and casein phosphopeptide was superior to fluoride varnish or CPP-ACP applied alone on the enamel of young permanent teeth. PMID:26538909

  14. An infected dentigerous cyst associated with an impacted permanent maxillary canine, inverted mesiodens and impacted supernumerary teeth.

    Science.gov (United States)

    Mohan, Karthik Rajaram; Natarajan, Balan; Mani, Sudhaamani; Sahuthullah, Yasmeen Ahmed; Kannan, Arivukkadal Vijaya; Doraiswamy, Haritha

    2013-07-01

    A dentigerous cyst is an odontogenic cyst associated with the crown of the impacted or unerupted teeth. Such cyst remain initially completely asymptomatic unless when infected and can be discovered only on routine radiographic examination. Here, such a case of dentigerous cyst, which was discovered on routine radiographic examination, is discussed here.

  15. An infected dentigerous cyst associated with an impacted permanent maxillary canine, inverted mesiodens and impacted supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Karthik Rajaram Mohan

    2013-01-01

    Full Text Available A dentigerous cyst is an odontogenic cyst associated with the crown of the impacted or unerupted teeth. Such cyst remain initially completely asymptomatic unless when infected and can be discovered only on routine radiographic examination. Here, such a case of dentigerous cyst, which was discovered on routine radiographic examination, is discussed here.

  16. Comparison of Clinical Success of Applying a Kind of Fissure Sealant on the Lower Permanent Molar Teeth in Dry and Wet Conditions

    Directory of Open Access Journals (Sweden)

    Tahereh Eskandarian

    2015-09-01

    Full Text Available Statement of the Problem: Fissure sealant therapy is among the most effective methods of preventing dental caries. However, it is lengthy and isolation of the teeth is difficult in this procedure especially in young children. Using new hydrophilic fissure sealant may reduce such problems. Purpose: This study aimed to evaluate the clinical success of a hydrophilic fissure sealant on the lower permanent mo-lar teeth in dry and wet conditions. Materials and Method: This clinical trial assessed 31 patients (mean age 8.13±1.77 years who needed fissure sealant therapy on their first or second mandibular permanent molar. Having performed dental prophylaxis, the teeth were etched and rinsed. Then one of the two was randomly selected and sealed with smartseal & loc in isolated and dry con-ditions; while, the other was wetted on the etched enamel by using a saliva-contaminated micro brush, and was then sealed with the same fissure as the first tooth. Six and 12 months later, two independent observers examined the clinical success of sealant through checking the marginal integrity, marginal discoloration, and anatomical form. Data were analyzed by using SPSS software, version 16. The bivariate Chi-square and Exact Fisher tests were used to compare the clinical success of the two treatment methods. Results: There was a high interpersonal reliability between the two examiners (K= 0.713. After 12 months, 90.3% clinical success was observed in dry conditions and 83.9% in wet conditions for smartseal & loc; however, the differ-ence was not statistically significant (p= 0.0707. Conclusion: According to the results of this study, it seems that using new hydrophilic fissure sealant can reduce tech-nical sensitivities and consequently decreases the apprehensions on saliva contamination of etched enamel during treatment procedures.

  17. Use of platelet-rich plasma for regeneration in non-vital immature permanent teeth: Clinical and cone-beam computed tomography evaluation.

    Science.gov (United States)

    Alagl, Adel; Bedi, Sumit; Hassan, Khalid; AlHumaid, Jehan

    2017-04-01

    Objective This study was performed to assess the clinical and radiological outcomes of a revascularization procedure in immature teeth with apical periodontitis using platelet-rich plasma (PRP). The PRP protocol and conventional revascularization protocol, which used a blood clot as the scaffold, were compared. Methods Thirty non-vital immature permanent teeth were randomly categorized into two groups. After disinfecting the root canal space with triple antibiotic paste (1:1:1 ciprofloxacin, metronidazole, and cefaclor), a tissue scaffold was created using either PRP or a blood clot (control) and covered with white mineral trioxide aggregate. All cases were followed up clinically and radiographically for 12 months. Differences in bone density, root length, and lesion size were calculated using preoperative and postoperative computed tomography images. The means of the differences in individual parameters in the blood clot and PRP groups were compared using the Mann-Whitney U test. Results After 5 months, sensitivity tests (cold and electric pulp tests) elicited a delayed positive response in 23 sites. At 12 months, cone-beam computed tomography revealed resolution or a decrease in lesion size and an increase in bone density in all 30 (100%) teeth. Additionally, continued root development was observed in 22 (73%) teeth and early root growth was observed in the test group (mineral trioxide aggregate with PRP). Conclusions The results of this study suggest that PRP can serve as a successful scaffold for regenerative endodontic treatment. With the exception of a significant increase in root length, the results of treatment with PRP were not significantly different from those of the conventional protocol using a blood clot as the scaffold.

  18. Immunohistological Evaluation of Revascularized Immature Permanent Necrotic Teeth Treated by Platelet-Rich Plasma: An Animal Investigation

    Science.gov (United States)

    Moradi, Saeed; Talati, Ali; Forghani, Maryam; Jafarian, Amir Hossein; Naseri, Mandana; Shojaeian, Shiva

    2016-01-01

    Objective Pulp regeneration within the root canal of necrotic teeth is considered an ideal treatment to allow for continued root development and recover teeth vitality. This study aims to evaluate the inductive effect of platelet-rich plasma (PRP) on expression of angiogenesis factors and pulpal revascularization of immature necrotic teeth. Materials and Methods In this experimental animal study, we randomly divided 28 immature premolars from two mixed breed dogs into four groups, two experimental, negative and a positive control. Premolars in negative control group were left intact to develop normally. In the positive control and experimental groups, we removed the pulps and induced pulp necrosis, after which the chambers were sealed. Then, we applied the revascularization protocol in the experimental teeth located in the right quadrant. Two months later, the same protocol was applied to the left quadrant. The root canals were disinfected by irrigation with sodium hypochlorite (NaOCl) solution and application a triple antibiotic past. Following the induction of a blood clot (BC) inside the canal space, the coronal portion of the canals was assigned to either of two experimental groups: group 1 [BC+PRP+ mineral trioxide aggregate (MTA)], group 2 (BC+MTA). Access cavities were sealed with a Glass Ionomer. The jaws that held the teeth were processed for histologic analysis of newly formed tissue and immunohistochemical evaluation according to vascular endothelial growth factor (VEGF) and factor VIII expressions in the canals. Results Histological analysis demonstrated no significant difference in the formation of new vital tissue inside the root canals between groups1 (42.8%) and 2 (43.5%, P>0.05). Based on immunohistochemical evaluation, micro-vessel density (MVD) of the granulation tissues in both groups were similar and were higher compared with the normal pulp. We observed strongly positive expressions of VEGF and factor VIII in the stromal and endothelial cells

  19. Immunohistological Evaluation of Revascularized Immature Permanent Necrotic Teeth Treated by Platelet-Rich Plasma: An Animal Investigation

    Directory of Open Access Journals (Sweden)

    Saeed Moradi

    2016-09-01

    Full Text Available Objective: Pulp regeneration within the root canal of necrotic teeth is considered an ideal treatment to allow for continued root development and recover teeth vitality. This study aims to evaluate the inductive effect of platelet-rich plasma (PRP on expression of angiogenesis factors and pulpal revascularization of immature necrotic teeth. Materials and Methods: In this experimental animal study, we randomly divided 28 immature premolars from two mixed breed dogs into four groups, two experimental, negative and a positive control. Premolars in negative control group were left intact to develop normally. In the positive control and experimental groups, we removed the pulps and induced pulp necrosis, after which the chambers were sealed. Then, we applied the revascularization protocol in the experimental teeth located in the right quadrant. Two months later, the same protocol was applied to the left quadrant. The root canals were disinfected by irrigation with sodium hypochlorite (NaOCl solution and application a triple antibiotic past. Following the induction of a blood clot (BC inside the canal space, the coronal portion of the canals was assigned to either of two experimental groups: group 1 [BC+PRP+ mineral trioxide aggregate (MTA], group 2 (BC+MTA. Access cavities were sealed with a Glass Ionomer. The jaws that held the teeth were processed for histologic analysis of newly formed tissue and immunohistochemical evaluation according to vascular endothelial growth factor (VEGF and factor VIII expressions in the canals. Results: Histological analysis demonstrated no significant difference in the formation of new vital tissue inside the root canals between groups1 (42.8% and 2 (43.5%, P>0.05. Based on immunohistochemical evaluation, micro-vessel density (MVD of the granulation tissues in both groups were similar and were higher compared with the normal pulp. We observed strongly positive expressions of VEGF and factor VIII in the stromal and

  20. Histological structures and acidic etching sensitivities of the enamels at the occlusal pit parts in the deciduous and permanent teeth

    Energy Technology Data Exchange (ETDEWEB)

    Takahashi, Masashi [Department of Dental Hygiene, Nippon Dental University College at Niigata, Niigata 951-8580 (Japan)]. E-mail: masashi@ngt.ndu.ac.jp; Zheng, Jinhua [Department of Oral Anatomy, School of Dentistry at Niigata, Nippon Dental University, Niigata 951-8580 (Japan); Mori, Kazuhisa [Department of Oral Surgery, School of Dentistry at Niigata, Nippon Dental University, Niigata 951-8580 (Japan); Mataga, Izumi [Department of Oral Surgery, School of Dentistry at Niigata, Nippon Dental University, Niigata 951-8580 (Japan); Kobayashi, Kan [Department of Oral Anatomy, School of Dentistry at Niigata, Nippon Dental University, Niigata 951-8580 (Japan)

    2006-05-15

    The purpose of this study is to compare the histological structures and acidic etching sensitivities of the enamels at the occlusal pit parts between the deciduous molars and permanent molars. They were observed by the polarizing and scanning electron microscopies. The enamel rods were less made slender by EDTA etching and the outlines of the apatite crystals, constituting the enamel rods, were clearer at the occlusal pit part of the deciduous molar than that of the permanent molar in reverse of that at the cusp part. It is thought that the enamel at the occlusal pit part of the permanent molar is more easily decayed by the dental caries than that of the deciduous molar because the former is more easily decayed by the acidic etching than the latter in reverse at the cusp part. It is considered that the thin superficialmost layer of the enamel at the occlusal pit part of the permanent molar has originally higher degree of resistance to the dental caries.

  1. Delayed Treatment of Traumatized Primary Teeth with Distinct Pulp Response: Follow-Up until Permanent Successors Eruption

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    Gabriela Cristina de Oliveira

    2017-01-01

    Full Text Available Complicated crown fracture and crown-root fracture with pulp involvement expose dental pulp to the oral environment. The pulp outcome is often unpredictable because the patient and injury which are related to variables can influence the treatment of choice and the prognosis of the case. This report presents the case of a 4-year-old boy with complicated crown fracture with pulp polyp in the primary right maxillary central incisor (51 and crown-root fracture with pulp involvement in the primary left maxillary central incisor (61, which was treated only 3 months after the tooth injuries. The treatment of choice was extraction of tooth (61 due to a periapical lesion with disruption of the dental follicle of the permanent successor and pulpotomy (MTA of the tooth (51, because the pulp presented signs of vitality. At the follow-up visits, no clinical, symptomalogical, and radiographic changes were observed until the primary tooth’s exfoliation. However, at 3-year follow-up, the permanent successors showed hypocalcification and the position of the permanent right maxillary central incisors (11 was altered. Besides the conservative and adequate delayed treatment, the sequelae on the permanent successors could not be avoided.

  2. Minimization of cogging torque in permanent magnet motors by teeth pairing and magnet arc design using genetic algorithm

    Science.gov (United States)

    Eom, Jae-Boo; Hwang, Sang-Moon; Kim, Tae-Jong; Jeong, Weui-Bong; Kang, Beom-Soo

    2001-05-01

    Cogging torque is often a principal source of vibration and acoustic noise in high precision spindle motor applications. In this paper, cogging torque is analytically calculated using energy method with Fourier series expansion. It shows that cogging torque is effectively minimized by controlling airgap permeance function with teeth pairing design, and by controlling flux density function with magnet arc design. For an optimization technique, genetic algorithm is applied to handle trade-off effects of design parameters. Results show that the proposed method can reduce the cogging torque effectively.

  3. Maturasi dan erupsi gigi permanen pada anak periode gigi pergantian (The maturition and eruption of permanent teeth in mixed dentition children

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    Sri Kuswandari

    2014-06-01

    Full Text Available Background: Tooth eruption might used as predictor of child age when the chronologic age is unknown. Beside the dental maturity, tooth eruption is also influenced by some factors, such as caries and tooth extraction. Purpose: The aim of this research was to examine the relationship of maturity and eruption of permanent teeth with chronologic age in mixed dentition period children. Methods: The subjects were patients of Prof. Soedomo Dental Hospital Pediatric Dental Clinic, consist of 38 boys and 39 girls in the aged of 6-12 years. The tooth eruption data was taken by counting the permanent teeth in intra oral examination. The dental maturity was assessed by Dermijian method from dental panoramic radiology. The data were statistical analyzed by regresion-correlation and t-test program of SPSS 16.0 for Windows. Results: Maturation of permanent teeth in each of age group was more advanced in girls than boys. However, only groups of 7, 8 and 11 years were showed significant different (p<0.05, while for tooth eruption there was no significant difference (p>0.05. The coefficient correlation between tooth eruption, chronologic age and dental maturation scores were relative high, between 0.75–0.86 (p<0.01. The contribution of chronologic age and dental maturation to predict tooth eruption (R2 were 58–73.6%. The Dermijian method predicted age 0.83 years higher. Conclusion: There were close relationship between chronologic age, Dermijian method dental maturity, and eruption of permanen tooth, and could be used as predictor for eruption of permanent teeth in the mixed dentition period children. The Dermijian method predicted 0.83 years older than the chronologic age.Latar belakang: Erupsi gigi sering digunakan untuk memperkirakan umur anak. Selain maturasi gigi, erupsi gigi juga dipengaruhi oleh faktor, seperti karies dan pencabutan gigi. Tujuan: Penelitian ini bertujuan untuk meneliti hubungan antara maturasi dan erupsi gigi permanen dengan umur pada

  4. Alveolar process fractures in the permanent dentition. Part 1. Etiology and clinical characteristics. A retrospective analysis of 299 cases involving 815 teeth

    DEFF Research Database (Denmark)

    Andreasen, Jens Ove; Lauridsen, Eva

    2015-01-01

    process. RESULTS: Violence was the overall most frequent cause of injury in men (44%), whereas the three most common causes of this type of injury in women were violence (33%), falls (32%), or traffic injuries (26%). Fracture of the alveolar process occurred most frequently in the maxilla (74%) and less...... process fractures are rare. They occur most frequently in young males and are often associated with violence. Concomitant soft tissue injuries are frequent. This type of injury accordingly appears to result from a frontal impact transmitted through a soft tissue shield (the lips) where the zone of least......AIM: To describe the etiology and clinical characteristics of alveolar process fractures treated in a regional trauma clinic. MATERIAL AND METHOD: The study is a retrospective descriptive analysis of 299 patients (180 males, 119 females; 815 permanent teeth) diagnosed with fractures of the alveolar...

  5. Evaluation of the Root and Canal Morphology of Mandibular Permanent Anterior Teeth in an Iranian Population by Cone-Beam Computed Tomography

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    Mohsen Aminsobhani

    2013-01-01

    Full Text Available Objective: To evaluate differences in the root and canal configurations of mandibular permanent anterior incisors and canines in an Iranian population by means of Cone Beam CT (CBCT images.Materials and Methods: Four hundred CBCT images of mandibular permanent incisors and canines that met the inclusion criteria were evaluated. Vertucci´s classification was used to evaluate the number of roots, number of root canals, root lengths, root curvatures and canal types.Results: Totally 632 central incisors, 614 lateral incisors and 608 canines were evaluated. The average length of the mandibular central, lateral incisors and canines was 21.3±0.10, 21.9± 0.13 and 25.1± 0.11 mm, respectively. All of the mandibular central and lateral incisors had one root, but the incidence of single-rooted mandibular canines and two-rooted mandibular canines was 96.3% and 4.7%, respectively. The majority of mandibular central, lateral incisors and canines had one canal (72.7%, 70.6% and 71.8%, respectively. Five types of Vertucci canal configurations were seen in the evaluated teeth. Type 1 Vertucci configuration was the most prevalent configuration (72.3%, 70.6% and 71.8% for the central, lateral incisors and canines, respectively, and type 5 Vertucci canal configuration was the least prevalent type seen (3.3%, 3.2% and 2.3% for the central, lateral incisors and canines, respectively. The most frequent root curvatures in these teeth were distally and buccally. No significant difference was seen between male and female patients regarding any of the parameters evaluated in this study (p>0.05.Conclusion: More attention should be given to the detection of additional canals and the recognition of canal curvature in Iranian patients.

  6. A comparative evaluation of the blood clot, platelet-rich plasma, and platelet-rich fibrin in regeneration of necrotic immature permanent teeth: A clinical study

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    Isha Narang

    2015-01-01

    Full Text Available Introduction: This study was designed as a clinical trial to evaluate and compare the regenerative potential of platelet-rich fibrin (PRF, platelet-rich plasma (PRP, and blood clot in immature necrotic permanent teeth with or without associated apical periodontitis. Methods: Access preparation was done under rubber dam isolation. Copious irrigation was done with 2.5% NaOCl and triple antibiotic paste was placed as an intracanal medicament. After 4 weeks, the cases were divided into four groups with five patients in each group. The study design had three test arms and one control arm. Group I in which mineral trioxide aggregate apexification was carried out and it was kept as control group to evaluate the regenerative potential of blood clot and platelet concentrates, Group II in which blood clot was used as scaffold in the canal, Group III in PRF was used as scaffold, and Group IV in which PRP carried on collagen was used as a scaffold. Results: The clinical and radiographic evaluation after 6 and 18 months was done by two independent observers who were blinded from the groups. The scoring was done as: None score was denoted by, Fair by 1, Good by 2, and Excellent by 3. The data were then analyzed statistically by Fisher′s exact test using Statistics and Data 11.1(PRP Using harvest Smart PReP2 which showed statistically significant values in Group III as compared to other Groups. Conclusion: PRF has huge potential to accelerate the growth characteristics in immature necrotic permanent teeth as compared to PRP and blood clot.

  7. Apical Extrusion of Irrigants in Immature Permanent Teeth by Using EndoVac and Needle Irrigation: An In Vitro Study

    Science.gov (United States)

    Velmurugan, N; Sooriaprakas, C; Jain, Preetham

    2014-01-01

    Objective: Immature teeth have a large apical opening and thin divergent or parallel dentinal walls; hence, with conventional needle irrigation there is a very high possibility of extrusion. This study was done to compare the apical extrusion of NaOCl in an immature root delivered using EndoVac and needle irrigation. Materials and Methods: Eighty freshly extracted maxillary central incisors were decoronated followed by access cavity preparation. Modified organotypic protocol was performed to create an open apex; then, the samples were divided into four groups (n=20): EndoVac Microcannula (group I), EndoVac Macrocannula (group II), NaviTip irrigation needle (group III) and Max-i-Probe Irrigating needle (group IV); 9.0 ml of 3% sodium hypochlorite was delivered slowly over a period of 60 seconds. Extruded irrigants were collected in a vial and analysed statistically. Results: Group I, group III and group IV showed 100% extrusion (20/20) but group II showed only 40% extrusion (8/20). The difference in this respect between group II and other groups was statistically significant (Pirrigant. Group I extruded 7.53ml of the irrigant. Group III and group IV extruded the entire volume of irrigant delivered. Conclusion: EndoVac Macrocannula resulted in the least extrusion of irrigant in immature teeth when compared to EndoVac Microcannula and conventional needle irrigation. PMID:25584055

  8. Apical Extrusion of Irrigants in Immature Permanent Teeth by Using EndoVac and Needle Irrigation: An In Vitro Study.

    Directory of Open Access Journals (Sweden)

    N Velmurugan

    2014-08-01

    Full Text Available Immature teeth have a large apical opening and thin divergent or parallel dentinal walls; hence, with conventional needle irrigation there is a very high possibility of extrusion. This study was done to compare the apical extrusion of NaOCl in an immature root delivered using EndoVac and needle irrigation.Eighty freshly extracted maxillary central incisors were decoronated followed by access cavity preparation. Modified organotypic protocol was performed to create an open apex; then, the samples were divided into four groups (n=20: EndoVac Microcannula (group I, EndoVac Macrocannula (group II, NaviTip irrigation needle (group III and Max-i-Probe Irrigating needle (group IV; 9.0 ml of 3% sodium hypochlorite was delivered slowly over a period of 60 seconds. Extruded irrigants were collected in a vial and analysed statistically.Group I, group III and group IV showed 100% extrusion (20/20 but group II showed only 40% extrusion (8/20. The difference in this respect between group II and other groups was statistically significant (P<0.001. With regards to the volume of extrusion, group II had only 0.23 ml of extruded irrigant. Group I extruded 7.53ml of the irrigant. Group III and group IV extruded the entire volume of irrigant delivered.EndoVac Macrocannula resulted in the least extrusion of irrigant in immature teeth when compared to EndoVac Microcannula and conventional needle irrigation.

  9. Regenerative endodontics--biologically-based treatment for immature permanent teeth: a case report and review of the literature.

    Science.gov (United States)

    Thomson, A; Kahler, B

    2010-12-01

    A paradigm shift in the treatment of immature, necrotic teeth has occurred with biologically-based principles and regenerative endodontic protocols replacing traditional 'apexification' procedures. Preliminary research suggests that stem and progenitor cells from the pulp and/or periodontium contribute to continued root development when regenerative procedures are followed. A mandibular premolar tooth with a chronic periapical abscess was irrigated with sodium hypochlorite with minimal instrumentation and then dressed with tri-antibiotic paste consisting of ciprofloxacin, metronidazole and amoxicillin. At a subsequent visit a blood clot was evoked in the canal by irritating periapical tissues and the canal sealed with mineral trioxide aggregate, glass ionomer cement and composite resin. Resolution of apical periodontitis and the draining sinus, continued root maturation and apical closure occurred over an 18-month period. The tooth became responsive to pulp sensibility testing. It is important that dentists recognize the potential of regenerative endodontics in the treatment of necrotic, immature teeth. Initial management should involve irrigation with sodium hypochlorite only. Intra-canal medicaments, such as calcium hydroxide, are contraindicated as they inhibit further root growth. This report uses a variation of the tri-antibiotic paste currently recommended for regenerative procedures that avoided the discolouration of the crown associated with current protocols. Regenerative endodontics with continued root growth may reduce the risk of fracture and premature tooth loss associated with traditional 'apexification' procedures where the root remains thin and weak. © 2010 Australian Dental Association.

  10. Recombinant Amelogenin Protein Induces Apical Closure and Pulp Regeneration in Open-apex, Nonvital Permanent Canine Teeth.

    Science.gov (United States)

    Mounir, Maha M F; Matar, Moustafa A; Lei, Yaping; Snead, Malcolm L

    2016-03-01

    Recombinant DNA-produced amelogenin protein was compared with calcium hydroxide in a study of immature apex closure conducted in 24 young mongrel dogs. Root canals of maxillary and mandibular right premolars (n = 240) were instrumented and left open for 14 days. Canals were cleansed, irrigated, and split equally for treatment with recombinant mouse amelogenin (n = 120) or calcium hydroxide (n = 120). After 1, 3, and 6 months, the animals were sacrificed and the treated teeth recovered for histologic assessment and immunodetection of protein markers associated with odontogenic cells. After 1 month, amelogenin-treated canals revealed calcified tissue formed at the apical foramen and a pulp chamber containing soft connective tissue and hard tissue; amelogenin-treated canals assessed after 3- and 6-month intervals further included apical tissue functionally attached to bone by a periodontal ligament. In contrast, calcified apical tissue was poorly formed in the calcium hydroxide group, and soft connective tissue within the pulp chamber was not observed. The findings from this experimental strategy suggest recombinant amelogenin protein can signal cells to enhance apex formation in nonvital immature teeth and promote soft connective tissue regeneration. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  11. AGE ESTIMATION BY USING ERUPTION OF PERMANENT TEETH: A COMPARATIVE STUDY IN LOCAL POPULATION TO PROVE/DISPROVE AGES OF ERUPTION USED IN ROUTINE PRACTICE

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    Tamilmani

    2015-10-01

    Full Text Available Estimation of age is one of the important medico legal works where medical knowledge is applied in rendering Justice to the public and to the state. Assessment of age is often required in civil and criminal litigations. Assessment of age of an individual by examination of teeth is one of the universally accepted methods of age estimation. In a developing country like India, a large number of people are illiterate and have no knowledge or records of their date of birth which is required by law enforcing age ncies in matters like, criminal responsibilities, identification, judicial punishment, consent, rape, criminal abortion, employment, attainment of majority, kidnapping and prostitution (Pathak et al, 1999. Age estimation is also required for admission pur poses at the time of schooling, joining services and during retirement. Estimation of age is also required for giving old age benefits. Hence, scientific determination of age is very important. Key words; Eruption of permanent teeth, J udicial punishment , Legal sections , Estimation of age in both sexes.

  12. Comparative evaluation of shear bond strength and microleakage of tricalcium silicate-based restorative material and radioopaque posterior glass ionomer restorative cement in primary and permanent teeth: An in vitro study

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    Vignesh Guptha Raju

    2014-01-01

    Full Text Available Background: Restoration of carious primary molars is still a major concern while treating the young children that too in deep carious lesion which extends below the cemento-enamel junction (CEJ where pulp protection and achieving adequate marginal seal are very important to prevent secondary caries. The needs were met with the development of new materials. One such of new bioactive material is tricalcium silicate-based restorative material (Biodentine, recommended for restoring deep lesions. Aim: To evaluate and compare shear bond strength and microleakage of tricalcium silicate-based restorative material (Biodentine and glass ionomer cement (Fuji IX GP in primary and permanent teeth. Materials and Methods: Occlusal surface of crowns were ground flat. PVC molds were stabilized over flat dentin surface and filled with tricalcium silicate-based restorative material (Biodentine/glass ionomer cement (Fuji IX GP according to group ascertained. Shear bond strength was evaluated using universal testing machine (INSTRON. Standardized Class II cavities were prepared on both primary and permanent teeth, and then restored with tricalcium silicate-based restorative material (Biodentine/glass ionomer cement (Fuji IX GP according to group ascertained, over which composite resin material was restored using an open sandwich technique. Microleakage was assessed using dye penetration. Microleakage was examined using a stereomicroscope. Results: Results showed that glass ionomer cement (Fuji IX GP exhibited better shear bond strength than tricalcium silicate-based restorative material (Biodentine. Mean microleakage score for glass ionomer cement (Fuji IX GP in permanent teeth was 1.52 and for primary teeth was 1.56. The mean microleakage for tricalcium silicate-based restorative material (Biodentine in permanent teeth was 0.76 and for primary teeth was 0.60. Glass ionomer cement (Fuji IX GP exhibited more microleakage than tricalcium silicate-based restorative

  13. Comparative evaluation of shear bond strength and microleakage of tricalcium silicate-based restorative material and radioopaque posterior glass ionomer restorative cement in primary and permanent teeth: an in vitro study.

    Science.gov (United States)

    Raju, Vignesh Guptha; Venumbaka, Nilaya Reddy; Mungara, Jayanthi; Vijayakumar, Poornima; Rajendran, Sakthivel; Elangovan, Arun

    2014-01-01

    Restoration of carious primary molars is still a major concern while treating the young children that too in deep carious lesion which extends below the cemento-enamel junction (CEJ) where pulp protection and achieving adequate marginal seal are very important to prevent secondary caries. The needs were met with the development of new materials. One such of new bioactive material is tricalcium silicate-based restorative material (Biodentine), recommended for restoring deep lesions. To evaluate and compare shear bond strength and microleakage of tricalcium silicate-based restorative material (Biodentine) and glass ionomer cement (Fuji IX GP) in primary and permanent teeth. Occlusal surface of crowns were ground flat. PVC molds were stabilized over flat dentin surface and filled with tricalcium silicate-based restorative material (Biodentine)/glass ionomer cement (Fuji IX GP) according to group ascertained. Shear bond strength was evaluated using universal testing machine (INSTRON). Standardized Class II cavities were prepared on both primary and permanent teeth, and then restored with tricalcium silicate-based restorative material (Biodentine)/glass ionomer cement (Fuji IX GP) according to group ascertained, over which composite resin material was restored using an open sandwich technique. Microleakage was assessed using dye penetration. Microleakage was examined using a stereomicroscope. RESULTS showed that glass ionomer cement (Fuji IX GP) exhibited better shear bond strength than tricalcium silicate-based restorative material (Biodentine). Mean microleakage score for glass ionomer cement (Fuji IX GP) in permanent teeth was 1.52 and for primary teeth was 1.56. The mean microleakage for tricalcium silicate-based restorative material (Biodentine) in permanent teeth was 0.76 and for primary teeth was 0.60. Glass ionomer cement (Fuji IX GP) exhibited more microleakage than tricalcium silicate-based restorative material (Biodentine), which was statistically significant

  14. COMPARISON OF CHILDREN'S FOLLOW-ON INSTANT POWDERED COW'S MILK FORMULA, BUFFALO MILK FORMULA AND CHICKEN-BASED FORMULA ON ENAMEL MICROHARDNESS OF BOVINE TEETH IN VITRO.

    Science.gov (United States)

    Vongsavan, Kadkao; Rirattanapong, Praphasri; Surarit, Rudee

    2016-03-01

    Dental caries are a major public health problem worldwide. The aim of this study was to compare the effects of children's follow-on instant powdered cow's milk formula, buffalo milk formula and a chicken-based formula on microhardness of bovine enamel with artificial caries-like lesions. Forty bovine teeth were each placed in acrylic blocks and the enamel surfaces were polished to create flat 5 x 5 millimeter surfaces. The teeth surfaces were then demineralized using 0.1M lactic acid (pH 4.5) to achieve an enamel microhardness of 35-65 Vickers Hardness Numbers (VHN). All specimens were then randomly allocated into one of 4 groups (n=10/group). For remineralization, each group was soaked in a different kind of milk formula for 2 hours at 37°C except group 1 which was a negative control (artificial saliva) group. Group 2 was soaked in Murrah™ buffalo milk formula (a positive control ), group 3 in S-26-Promil-Gold™ (cow's milk formula) and group 4 in a chicken-based formula (Siriraj Hospital, Mahidol University). The microhardness of the specimens was then measured again. Data were analyzed using a one-way ANOVA and paired t-test with a 95% confidence interval. After exposure to the formula, the mean VHN for each study group was significantly higher (paired t-test, p 0.05). In conclusion, S-26-Promil-Gold™ follow-on cow milk formula, Murrah™ buffalo milk formula and the chicken-based formula all increased bovine enamel microhardness after soaking for 2 hours.

  15. Clinical and radiographic assessment of mineral trioxide aggregate and calcium hydroxide as apexification agents in traumatized young permanent anterior teeth: A comparative study

    Science.gov (United States)

    Damle, S. G.; Bhattal, Hiteshwar; Damle, Dhanashree; Dhindsa, Abhishek; Loomba, Ashish; Singla, Sumit

    2016-01-01

    Background: To evaluate and compare the efficacy of mineral trioxide aggregate (MTA) and traditionally used calcium hydroxide (Ca(OH)2) in inducing root end formation of immature roots of traumatized young permanent anterior teeth. Materials and Methods: The study was carried out on 22 nonvital, immature permanent maxillary incisors. Samples were allotted into two groups - Group I MTA and Group II Ca(OH)2 Success rate was determined based upon the time duration required for apical barrier formation. The canals were obturated using gutta-percha points in MTA group, after 24 h, whereas in Ca(OH)2 group, obturation was carried out after radiographic confirmation of the apical barrier. The clinical and radiographic evaluation was carried out at a follow-up periods of 3, 6, and 9 months and statistical analysis was carried out by SPSS version 15.0 statistical analysis software (Chi-square test and fisher exact test). Results: In MTA Group, barrier formation was observed in 90.90% of the patients after 9 months whereas in Ca(OH)2 Group, the same was observed in 81.81%. The mean time required for barrier formation in MTA group was 4.90 months and 5.33 months in Ca(OH)2 group. Conclusion: MTA and Ca(OH)2, as medicaments for apexification, were comparable in terms of the evaluation parameters. However, MTA was beneficial in terms of immediate obturation of immature roots with wide open apices. PMID:27274351

  16. A retrospective study of 50 replanted permanent teeth in children%儿童50 颗恒牙再植后的回顾性研究

    Institute of Scientific and Technical Information of China (English)

    管悦; 秦满

    2009-01-01

    Objective:To analyze the prognosis of replanted permanent teeth in children and associated factors. To determine the onset time of root resorption and related factors. Methods: Clinical data of replanted teeth treated in Department of Pediatric Dentistry, Peking University, School and Hospital of Stomatology, from January 2000 to December 2006,were collected, and the follow-up period was no less than six months. The Fisher's exact test and cox regression were used for statistical analysis. Results: The study comprised of 39 patients with 50 replanted permanent teeth. The periodontium healing rate was 18%, while root resorption rate was 82%. Replacement resorption was the most common type of root resorption (64%).The factors significantly affecting periodontium healing were stage of root development and storage of avulsed teeth.Stage of root development and the time of endodontic treatment significantly affected the onset time of root resorption(P<0.05). Conclusion: Replacement resorption is the most common type of root resorption. The factors significantly affecting periodontium healing are stage of root development and storage of avulsed teeth. Stage of root development and the time of endodontic treatment significantly affect the onset time of root resorption.%目的:分析再植牙的预后及影响预后的相关因素,观察再植后牙根吸收出现时间及影响因素.方法:对2000~2006 年于北京大学口腔医学院儿童口腔科注册的系统病历中,观察期≥6 个月的全脱位牙再植病历进行回顾性研究,记录患者及再植牙信息.应用卡方检验和生存分析(cox regression)进行统计学分析.结果:符合纳入标准的外伤病历39 份,涉及再植牙50 颗.牙周膜愈合的发生率为18%,牙根吸收发生率为82%,替代性吸收是最常见的牙周组织预后形式(64%).牙根发育情况和保存方式与牙周组织预后具有显著相关性;牙根发育情况、牙髓治疗时机可以影响牙

  17. Differential Neuronal Plasticity of Dental Pulp Stem Cells From Exfoliated Deciduous and Permanent Teeth Towards Dopaminergic Neurons.

    Science.gov (United States)

    Majumdar, Debanjana; Kanafi, Mohammad; Bhonde, Ramesh; Gupta, Pawan; Datta, Indrani

    2016-09-01

    Based on early occurrence in chronological age, stem-cells from human exfoliated deciduous teeth (SHED) has been reported to possess better differentiation-potential toward certain cell-lineage in comparison to stem-cells from adult teeth (DPSCs). Whether this same property between them extends for the yield of functional central nervous system neurons is still not evaluated. Hence, we aim to assess the neuronal plasticity of SHED in comparison to DPSCs toward dopaminergic-neurons and further, if the difference is reflected in a differential expression of sonic-hedgehog (SHH)-receptors and basal-expressions of tyrosine-hydroxylase [TH; through cAMP levels]. Human SHED and DPSCs were exposed to midbrain-cues [SHH, fibroblast growth-factor8, and basic fibroblast growth-factor], and their molecular, immunophenotypical, and functional characterization was performed at different time-points of induction. Though SHED and DPSCs spontaneously expressed early-neuronal and neural-crest marker in their naïve state, only SHED expressed a high basal-expression of TH. The upregulation of dopaminergic transcription-factors Nurr1, Engrailed1, and Pitx3 was more pronounced in DPSCs. The yield of TH-expressing cells decreased from 49.8% to 32.16% in SHED while it increased from 8.09% to 77.47% in DPSCs. Dopamine release and intracellular-Ca(2+) influx upon stimulation (KCl and ATP) was higher in induced DPSCs. Significantly lower-expression of SHH-receptors was noted in naïve SHED than DPSCs, which may explain the differential neuronal plasticity. In addition, unlike DPSCs, SHED showed a down-regulation of cyclic adenosine-monophosphate (cAMP) upon exposure to SHH; possibly another contributor to the lesser differentiation-potential. Our data clearly demonstrates for the first time that DPSCs possess superior neuronal plasticity toward dopaminergic-neurons than SHED; influenced by higher SHH-receptor and lower basal TH expression. J. Cell. Physiol. 231: 2048-2063, 2016. © 2016

  18. Efficacy of Biodentine as an Apical Plug in Nonvital Permanent Teeth with Open Apices: An In Vitro Study

    Directory of Open Access Journals (Sweden)

    Mehmet Bani

    2015-01-01

    Full Text Available The aim of this study was to evaluate the apical microleakage of Biodentine and MTA orthograde apical plugs and to compare the effect of thickness of these biomaterials on their sealing ability. A total of eighty maxillary anterior teeth were used. The apices were removed by cutting with a diamond disc (Jota, Germany 2 mm from the apical root end in an attempt to standardize the working length of all specimens to 15 ± 1 mm. Both materials were placed in 1–4 mm thickness as apical plugs root canal. Root canal leakage was evaluated by the fluid filtration technique. One-way ANOVA was used in order to determine normality of dispersal distribution of parameters; thereafter, results were analyzed by Kolmogorov-Smirnov test. Overall, between microleakage values of MTA and Biodentine regardless of apical plug thickness, no difference was observed. In terms of plug thickness, a statistically significant difference was observed between the subgroups of MTA and Biodentine (p<0.05. The apical sealing ability of Biodentine was comparable to MTA at any apical plug thickness.

  19. Efficacy of Biodentine as an Apical Plug in Nonvital Permanent Teeth with Open Apices: An In Vitro Study.

    Science.gov (United States)

    Bani, Mehmet; Sungurtekin-Ekçi, Elif; Odabaş, Mesut Enes

    2015-01-01

    The aim of this study was to evaluate the apical microleakage of Biodentine and MTA orthograde apical plugs and to compare the effect of thickness of these biomaterials on their sealing ability. A total of eighty maxillary anterior teeth were used. The apices were removed by cutting with a diamond disc (Jota, Germany) 2 mm from the apical root end in an attempt to standardize the working length of all specimens to 15 ± 1 mm. Both materials were placed in 1-4 mm thickness as apical plugs root canal. Root canal leakage was evaluated by the fluid filtration technique. One-way ANOVA was used in order to determine normality of dispersal distribution of parameters; thereafter, results were analyzed by Kolmogorov-Smirnov test. Overall, between microleakage values of MTA and Biodentine regardless of apical plug thickness, no difference was observed. In terms of plug thickness, a statistically significant difference was observed between the subgroups of MTA and Biodentine (p Biodentine was comparable to MTA at any apical plug thickness.

  20. MTA在临床恒牙盖髓术中的应用分析%Application Analysis of Pulpotomy in Permanent Teeth in Clinical MTA Cover

    Institute of Scientific and Technical Information of China (English)

    王国伟; 李瑞兰; 魏玉环

    2016-01-01

    Objective To analyze the clinical effect of applying MTA to permanent teeth operation. Methods 110 cases of patients with exposed pulp or penetrated pulp who were diagnosed and treated in our hospital from January 2014 to June 2015 are selected. Then divide them into two average groups with the method of random number double blind. One is the control group while the other is the research group. The 55 patients of the control group are directly operated by pulp capping with the application of calcium hydroxide. However, the other 55 patients of the research group are operated by pulp capping with the application of MTA. Results The treatment success rate of the patients in research group is 83.64% (46/55) which is much higher than that of the control group with 49.09% (27/55). The difference is considered statistical significance, P<0.05. Conclusion MTA, a new type of pulp capping agent, is better in the treatment of permanent teeth operation, which can be actively promoted and applied in clinical treatment.%目的:研究分析 MTA 用于恒牙盖髓术中的临床效果。方法选取2014年1月~2015年6月在我院进行诊治的110例露髓或穿髓患者,运用随机数字双盲法进行平均分组,一组55例患者应用氢氧化钙直接进行盖髓术作为对照组;一组55例患者应用 MTA 进行盖髓术治疗作为研究组。结果研究组患者治疗的成功率83.64%(46/55)高于对照组的49.09%(27/55),差异有统计学意义,P <0.05。结论 MTA是新型的一种盖髓剂,用于恒牙盖髓术的疗效更理想。

  1. Comparison of the Potential Discoloration Effect of Bioaggregate, Biodentine, and White Mineral Trioxide Aggregate on Bovine Teeth: In Vitro Research.

    Science.gov (United States)

    Yoldaş, Selen Esin; Bani, Mehmet; Atabek, Didem; Bodur, Haluk

    2016-12-01

    Tricalcium silicate cements can be used for pulp capping, pulpotomies, apical barrier formation in teeth with open apices, repair of root perforations, regenerative endodontics, and root canal filling. The aim of this study was to evaluate and compare the discoloration potential of 3 different tricalcium cements using a bovine tooth model. Forty bovine anterior teeth have been used for the study. Crowns separated from the roots were randomly divided into 4 groups: the BioAggregate (IBC, Vancouver, Canada) group, the Biodentine (Septodont, Saint Maur des Fosses, France) group, the mineral trioxide aggregate Angelus (Angelus, Londrina, PR, Brazil) group, and the only blood group. Materials have been placed to the standardized cavities on the lingual surfaces of the crowns, and their contact with blood has been provided. The color values of the samples were measured with a digital tooth shade determinator (VITA Easyshade; VITA Zahnfabrik, Bad Sackingen, Germany) before the placement of the materials, after the placement of the materials, in the 24th hour, in the first week, in the first month, in the third month, and in the first year. The mean value of all groups was compared using the Tukey multiple comparison test (α = 0.05). All groups displayed increasing discoloration during a period of the first year. The "only blood group" showed the highest color change values, and it was followed as BioAggregate, mineral trioxide aggregate Angelus, and Biodentine, respectively. Statistically significant differences were found for Biodentine when compared with the only blood and BioAggregate groups (P Biodentine is found to have the least discoloration potential among the tested materials. Copyright © 2016 American Association of Endodontists. Published by Elsevier Inc. All rights reserved.

  2. Validation of DIAGNOdent laser fluorescence and the International Caries Detection and Assessment System (ICDAS) in diagnosis of occlusal caries in permanent teeth: an in vivo study.

    Science.gov (United States)

    Castilho, Lia S; Cotta, Fernanda V M D; Bueno, Audrey C; Moreira, Allyson N; Ferreira, Efigênia F; Magalhães, Cláudia S

    2016-04-01

    The aim of this in vivo study was to validate the DIAGNOdent laser fluorescence method and the International Caries Detection and Assessment System (ICDAS) for caries classification against the gold standard, histological examination, for detecting occlusal caries on permanent molars; the thresholds used were the outer enamel (D1), the inner enamel and outer third of the dentine (D2), and the inner two-thirds of the dentine (D3). Patients with non-impacted third molars (n = 43) were recruited from a university clinic. A trained examiner performed the examinations. After the teeth were extracted, the histological criterion was used to determine the severity of the lesions. Intra-examiner agreement (weighted kappa) for ICDAS was 0.60 and reliability (intraclass correlation coefficient) for DIAGNOdent was 0.968. The correlations with the histological reference were weak for DIAGNOdent (rs = 0.369) and moderate for ICDAS (rs = 0.515). The areas under the receiver-operating characteristics (ROC) curve at D1, D2, and D3 were 0.60, 0.69, and 0.91, respectively, for ICDAS and 0.55, 0.65, and 0.92, respectively, for DIAGNOdent. ICDAS and DIAGNOdent proved to be reproducible methods with similar performance in the detection of occlusal carious lesions in dentine. The ability of DIAGNOdent to detect initial enamel lesions was higher than that of ICDAS, but with low specificity. The usefulness of DIAGNOdent as an adjunct method for assessment of initial occlusal caries in permanent molars is questionable.

  3. 正畸治疗的年轻恒牙和成熟恒牙的牙髓组织中VEGF水平比较%Expression of VEGF in dental pulp of immature and mature permanent teeth of human

    Institute of Scientific and Technical Information of China (English)

    刘高成; 吴佩玲; 步江; 白新华

    2014-01-01

    目的:探讨正畸治疗的年轻恒牙和成熟恒牙的牙髓组织中血管内皮生长因子(VEGF)水平及其临床意义。方法收集2010年6月-2013年10月在新疆医科大学第二附院口腔科行正畸治疗拔除的无龋健康的第一前磨牙56颗,包括年轻恒牙30颗和成熟恒牙26颗,采用常规免疫组化链酶亲和素-生物素-过氧化物酶复合物(srteptvadin-bitin complex,SABC)法比较年轻恒牙和成熟恒牙牙髓标本中血管内皮生长因子(vascular endothelial growth factor,VEGF)的表达。结果年轻恒牙牙髓成纤维细胞中的 VEGF呈强阳性表达,向冠部和根部表达逐渐减弱;成熟恒牙牙髓成纤维细胞中的 VEGF呈阳性表达,向冠部和根部表达逐渐减弱。与年轻恒牙比,成熟恒牙牙髓成纤维细胞中的 VEGF表达较弱,在冠部和根部的表达较弱。结论 VEGF在人年轻恒牙和成熟恒牙牙髓组织中表达有差异,VEGF 参与恒牙牙根的发育与成熟。%Objective To investigate the expressions and distributions of vascular endothelial growth factor (VEGF)in dental pulps of immature and mature permanent teeth of human.Methods The normal teeth, extracted for orthodontic from the Second Affiliated Hospital of Xinjiang Medical Uni versity,including 30 cases of immature permanent teeth and 26 cases of mature permanent teeth,from 2010.6-2013.10,were examined by Srteptvadin-bitin Complex (SABC)to determine the expressions of VEGF in their dental pulps.Results The expression of VEGF was strongly positive in the pulp fibroblasts of immature perma-nent teeth (P <0.05),but gradually weakened in the crown and root canal.The expression of VEGF was positive in the pulp fibroblasts of mature permanent teeth (P <0.05 ),but gradually weakened in the crown and root canal.Compared with mature permanent teeth,the expression of VEGF was stronger in the pulp fibroblasts of immature permanent teeth,weakened in the crown and root canal (P

  4. 58例年轻恒牙外伤冠折的处理分析%Analysis of the Treatment of 58 Cases of Young Permanent Teeth with Crown Fracture

    Institute of Scientific and Technical Information of China (English)

    李一桃

    2015-01-01

    目的:探究年轻恒牙外伤冠折的临床处理方法及效果。方法选择该院2009年3月—2014年9月口腔科门诊就诊年轻恒牙不同程度的外伤冠折的患者58例,依据不同临床表现分别给予直接盖髓术,活髓切断术,根尖诱导术治疗后对患牙进行随诊观察。结果治疗成功患牙52颗,占89%。结论对于年轻恒牙的外伤冠折,选择好正确的治疗方法,大多数患牙能保存牙髓活力,牙根能继续发育,永久性修复后患牙功能良好。%Objective To explore the effect of clinical treatment method for crown fracture of young permanent teeth. Methods 58 outpatients with crown fracture of young permanent teeth in different degree who were treated in the Department of Stomatology of our hospital were selected. Direct pulp capping, vital pulpotomy and apexification was respectively performed for them according to different clinical manifestations. All the patients were followed-up. Results 52 teeth were successfully treated, accounting for 89%. Conclusion For the young permanent teeth with crown fracture, right treatment can preserve pulp vitality and enable the continu-ous development of tooth root. Recovery functions of diseased teeth can be realized after permanent repair.

  5. Expression of VEGF and VEGFR in the pulp of different developmental state of permanent teeth%不同发育阶段恒牙牙髓组织中VEGF及受体的表达

    Institute of Scientific and Technical Information of China (English)

    关为群; 王清妹

    2012-01-01

    Objective; To investigate the histological and molecule level expression and distribution of VEGF, Flt-1, Flk-1 in the pulp of young and mature permanent teeth and explore the role of VEGF , Flt-1, Flk4 in the permanent root development. Methods; Young and mature permanent teeth were collected for orthodontic reasons, each group included 15 teeth. The expression and localization of VEGF , Flt-1, Flk4 were studied with immunohistochemistry. VEGF, Flt-1, Flk-1 mRNA levels of young and mature permanent teeth dental pulp were assayed by RT -PCR. Results; Immunohistochemical staining detected the expression of VEGF and Flk-1, they were more positive in young permanent than the mature (P <0.05) ; while Fit-1 was more positive in the mature ; RT-PCR demonstrated VEGF, Fit-1, Flk-1 mRNA expression in young and mature permanent teeth pulp tissue with 145 bp, 169 bp and 162 bp transcript respectively , and relative content of VEGF, Flt-1, Flk-1 in young permanent teeth were 1.7, 0. 6 and 1.5 times in mature ones. Conclusion; The expression of VEGF, Flt-1, Flk-1 in the pulp of young and mature permanent teeth showed different characteristics , which suggests that the reparative dentine formation of permanent teeth can be induced by regulating the upper genes at different development stages .%目的:探讨人年轻恒牙和成熟恒牙牙髓组织中VEGF及其受体Flt-1、Flk-1的组织学和分子水平的表达.方法:将因正畸治疗需要而拔除的人健康前磨牙分为根尖开放的年轻恒牙和根尖闭合的成熟恒牙,每组各15例.采用免疫组织化学方法检测VEGF及受体Flt-1、Flk-1蛋白的表达;RT-PCR法检测人年轻恒牙和成熟恒牙牙髓组织中VEGF、Flt-1、Flk-1的mRNA表达情况.结果:免疫组化显示年轻恒牙牙髓VEGF,Flk-1阳性表达的平均光密度(D)值高于成熟恒牙(P<0.05),而Flt-1的表达低于成熟恒牙(P<0.05).RT-PCR结果显示人年轻恒牙和成熟恒牙牙髓组织均可表达VEGF、Flt-1、Flk-1

  6. Clinical evaluation of fractured immature anterior permanent teeth after immediate restoration%年轻恒前牙冠折后即刻冠修复的疗效观察

    Institute of Scientific and Technical Information of China (English)

    陈永丰; 马兆峰; 李石

    2012-01-01

    目的:通过21例(29颗)年轻恒前牙外伤冠折实例,讨论外伤冠折牙的即刻临床处理方法及效果.方法:对29 颗年轻恒前牙冠折,根据不同情况分别进行了间接盖髓术、活髓切断术、根尖诱导术.术后即刻或1周内采用断冠再接、直接树脂修复、活动义齿对缺损牙行临时冠修复,缺损牙修复后经过至少1年的临床观察.结果:冠折的年轻恒前牙经过相应的牙髓治疗与冠修复治疗,绝大多数患牙取得了良好的治疗效果.结论:年轻恒前牙外伤性冠折,在尽可能促进牙根继续发育的同时,即刻冠修复对于儿童身心健康具有重要意义.%Objective The objective of this study is to discuss the clinical effect of immediate restoration of fractured 29 immature permanent anterior teeth from 21 patients. Methods 21 cases including 29 fractured anterior teeth were treated by indirect pulp capping, partial pulpotomy and apexification respectively.Then.the fractured teeth were restored with esthetic light-cured resin, patients' natural crown and removable prosthesis.AII the provisional restorations were observed at least for 1year. Results Fractured permanent anterior teeth were treated endodontically.including 7 indirect pulp capping, 19 partial pulpotomy and 3 apexification.During the period of observation.pulpitis occurred from 1 tooth of indirect pulp capping and 2 teeth of partial pulpotomy.and apexification was performed for the 3 teeth.Fracture occurred from 2 light-cured resin restored teeth.The rest restoration presented satisfied appearance and function. Conclusion It is suggested that immediate restoration is important to the fractured immature permanent anterior teeth in prerequisite of maintaining root continuous growth.

  7. Clinical application of glass fiber post in repair of young permanent teeth after traumatic dental injury%玻璃纤维桩在年轻恒牙冠折修复中的临床应用

    Institute of Scientific and Technical Information of China (English)

    刘彤; 姜秋; 李毅; 杨秀玲; 金永哲

    2011-01-01

    Objective; To explore the clinical application efficacy of glass fiber post in repair of young permanent teeth after traumatic dental injury. Methods; 64 children with young permanent teeth after traumatic dental injury in stomatological hospital of Jilin university from June 2007 to June 2009 were selected, and 90 teeth with diseases were included in the study, X - ray tomography was used to observe the developmental situation of root of tooth, 60 teeth with diseases and undeveloped root received vital pulpotomy and apexification by Vitapex; after the formation of root of tooth, perfect root canal therapy was carried out. The 90 teeth with diseases were divided into experimental group (group A) and control group (group B) , 50 teeth in group A were treated with resin nuclear crown repair by glass fiber post, and 40 teeth in group B were treated with resin nuclear crown repair by threaded nail, the teeth in the two groups were followed up regularly, the clinical application efficacies of the two groups were observed. Results; After one year, among the 50 teeth treated with resin nuclear crown repair by glass fiber post, 48 teeth were repaired successfully, the success rate was 96. 0%. Among the 40 teeth treated with resin nuclear crown repair by threaded nail, 33 teeth were repaired successfully, the success rate was 82. 5% , there was significant difference between the two groups (P < 0.05) . Conclusion; The clinical efficacy of glass fiber post in repair of young permanent teeth after traumatic dental injury is ideal, and the method can satisfy the clinical demand.%目的:探讨玻璃纤维桩在年轻恒牙冠折修复中的临床应用效果.方法:选择2007年6月~2009年6月在吉林大学口腔医院就诊的64例年轻恒牙冠折露髓的患儿,共计90颗患牙,拍摄X片观察牙根发育情况,对牙根未发育完全的60颗患牙先用活髓切断术或Vitapex进行根尖诱导,待牙根形成后,行完善的根管治疗.将其分为

  8. Determination of total and methyl mercury in human permanent healthy teeth by electrothermal atomic absorption spectrometry after extraction in organic phase.

    Science.gov (United States)

    Saber-Tehrani, M; Givianrad, M H; Hashemi-Moghaddam, H

    2007-02-28

    A simple and sensitive method has been developed for determination of inorganic and methyl mercury in biological samples by ETAAS. For determination of methyl mercury; it was transferred to toluene phase by acid leaching extraction method. For total mercury after digestion of samples; it was extracted to toluene phase by means of the chelating agent diethyldithiocarbamate. Formation of complex between MeHg and diethyldithiocarbamate enhance the MeHg signal and increases the reproducibility. Furthermore, Pd-DDC was used as modifier for both mercury and methyl mercury determinations. The optimization performance was independently carried out by modifying the parameters such as temperature of mineralization, atomization and gas flow rate for methylmercury and inorganic mercury in ETAAS. The limits of detection were 0.15 and 0.12mugg(-1) for methyl mercury and total mercury, respectively. The repeatability of the measurements of whole procedure were 15.8% for methyl mercury and 16.9% for total mercury determination. The accuracy of the method has been investigated by means of spiking different amounts of methylmercury and inorganic mercury to the samples. The recoveries were found within the range of 88-95% for methyl mercury and 85-92% for total mercury. For determination of total mercury, the method was validated by CVAAS. The obtained results by the present procedure were in good agreement with those of the CVAAS. The proposed method was applied for 30 human permanent healthy teeth (without filling) which significant positive correlations were found among number of amalgam filling and total mercury and MeHg.

  9. 缺失恒牙胚的乳牙牙髓在牙根吸收中作用的实验观察%The role of pulp in the root resorption of primary teeth without permanent tooth germs

    Institute of Scientific and Technical Information of China (English)

    林碧琛; 杨杰; 赵玉鸣; 葛立宏

    2011-01-01

    目的 研究恒牙胚缺失情况下,乳牙牙髓在其牙根吸收中的作用.方法 通过手术方式建立恒牙胚缺失犬动物模型,定期拍摄X线片观察乳牙根吸收情况.获取乳牙牙根吸收各期颌骨及牙髓样本,采用组织学方法和半定量反转录聚合酶链反应(RT-PCR)分析破牙细胞及其活化因子的分布情况.通过早期乳牙牙髓摘除术验证乳牙牙髓在牙根吸收中的作用.结果 组织学研究结果显示,恒牙胚缺失情况下乳磨牙牙根吸收时,破牙细胞主要在牙根的髓腔侧聚集.半定量RT-PCR结果显示,恒牙牙髓、乳牙牙髓、恒牙胚缺失乳磨牙牙根吸收中、晚期牙髓中NF-κB受体激活蛋白配体mRNA与β-肌动蛋白的灰度值比值分别为0.1314、0.1901、0.2111、0.6058(P>0.05).早期乳牙牙髓摘除术后,恒牙胚缺失乳牙牙根吸收平均开始于第26周,晚于对照牙(第21周).结论 在恒牙胚缺失乳牙牙根吸收过程中,乳牙牙髓发挥了重要作用.%Objective To investigate the role of pulp in the root resorption of primary teeth without permanent tooth germs. Methods The animal model without permanent tooth germs was established by surgery in Beagle dog. The root resorption was observed by taking periapical radiographs periodically. The samples of mandibular bone and pulp at different resorption stages were collected. The distribution of odontoclasts and the activating factor was analyzed by histological staining and semiquantitative reverse transcriptase polymerase chain reaction(RT-PCR). The role of pulp in the root resorption of primary teeth was tested by early pulpectomy. Results In the root resorption of primary molars without permanent teeth germs, a large number of odontoclasts were present on the pulpal surface of the root canal. Semiquantification RT-PCR showed that the ratios of the expression of receptor activator of NF-κB ligand (RANKL) mRNA and β-actin in the pulp of permanent teeth and primary teeth

  10. 氢氧化钙在年轻恒牙牙髓治疗中的疗效探析%Efficacy of Calcium Hydroxide in Endodontic Therapy for Immature Per-manent Teeth

    Institute of Scientific and Technical Information of China (English)

    宋林操

    2015-01-01

    目的:探析氢氧化钙在年轻恒牙牙髓治疗中的疗效。方法整群选取2012年1月-2015年6月该院收治的52例(54颗)第一磨牙牙髓炎和根尖周炎年轻恒牙患者作为研究对象,均给予氢氧化钙进行牙髓治疗,对其临床治疗效果进行分析。结果21颗深龋导致的意外穿髓采用盖髓术和活髓切断术进行治疗后,成功19颗,成功率为90.5%,33颗牙髓炎和根尖周炎采用根管治疗后成功30颗,成功率为(90.9%)。结论氢氧化钙在年轻恒牙牙髓治疗中的疗效确切,安全可靠,值得临床选择和积极推广使用。%Objective To analyze the efficacy of calcium hydroxide in endodontic therapy for immature permanent teeth. Methods 52 patients (54 teeth) with immature permanent teeth suffering from pulpitis and periapical periodontitis in first molar teeth admitted to our hospital from January 2012 and June 2015 were included in this study and given endodontic therapy using calcium hydroxide. The clinical efficacy was analyzed. Results 21 teeth of unexpected pulp canalization in deep dental caries were treated by pulp capping and pulpotomy and 19 were treated successfully with a success rate of 90.5%. 33 teeth of pulpitis and periapical periodontitis were treated by root canal therapy and 30 were treated successfully with a success rate of 90.9%. Conclusion Calcium hydroxide in endodontic therapy for immature permanent teeth has exact efficacy and is safe and reliable, therefore this method is worthy of application and active promotion in clinical practice.

  11. β-catenin在人恒牙牙髓及牙乳头中的表达%Expression of β-catenin in the apical papilla and dental pulp tissues of human permanent teeth

    Institute of Scientific and Technical Information of China (English)

    汤玲玲; 包志凡; 陈旭; 郭艳

    2012-01-01

    PURPOSE: The expression ofβ-catenin at the levell of mRNA and protein in the apical papilla and dental pulp tissues of human permanent teeth were compared to explore the possible relationship betweenβ-catenin and the development of pulp -dentin complex. METHODS: Forty -eight healthy permanent teeth in need of extraction for orthodontic treatment were obtained. The apical papilla and dental pulp tissues were isolated immediately when the teeth were extracted. All the samples were divided into 3 groups: group 1. apical papilla of immature permanent teeth; group 2, dental pulp tissues; of immature permanent leeth; group 3, dental pulp tissues of mature permanent teeth. RT-PCR and Western blot techniques were used to examine the expression ofβ-catenin at the level of mRNA and protein respectively. Mela Morph software was used to measure the gray value of the positively expressed hands. Two-sample t test was performed lo analyze the expression intensity (gray value) ofβ-oatenin by use of SPSS 11.0 software package. RESULTS: β-catenin was positively expressed at both mRNA level and protein level in all the samples investigated. The expression intensity ofβ- catenin in the dental pulp tissues of human immature permanent leeth was higher than that in the apical papillary tissues and that in the dental pulp lissues of human mature permanent leeth as well- The differences were statistically significant (P<0.05). CONCLUSIONS: β-catenin was expressed in belli the apical papilla and dental pulp tissues of immature and mature permanent teeth, but the expression intensity was different. It indicated thatβ-catenin may play an important rule in the development of pulp-dentin Complex and in the repfualive process after the dental pulp injury.%目的:比较人恒牙牙髓、牙乳头组织中β连环蛋白( β-catenin)的mRNA和蛋白的表达情况,探β-catenin与牙髓牙本质复合体发育之间的关系.方法:收集48颗因正畸而拔陈的健康前磨牙,拔除后

  12. The research progress of regenerative endodontic treatment for immature permanent teeth%年轻恒牙牙髓再生性治疗的研究进展

    Institute of Scientific and Technical Information of China (English)

    宋光泰; 靳秋晨

    2016-01-01

    The pulpal or periapical diseases of immature permanent teeth often lead to incomplete root develop⁃ment. It is a challenge for us to figure out how to ensure the continuous growth of the teeth and the formation of roots.There are many cases about pulp regeneration reported recently. With the regeneration and differentiation ability of stem cells, which exist in residual pulp tissue, periapical and periodontal tissues, the regeneration of new vital pulp tis⁃sue was induced under proper conditions, which is highly vascularized and rich in connective tissue, thus prompting continuous root growth and development, increasing root length, thickening root canal walls, and facilitating the coarcta⁃tion of the apical foramen. Besides, clinical and radiographic examinations shows successful results about the regenera⁃tive treatment, which is of milestone significance. The pulp regeneration treatment is designed to replace the pathologi⁃cal dental pulp tissue with new regenerated pulp tissue, based on biological tissue engineering process. This process in⁃cludes two key parts: one is pulp revascularization, regenerating new vital pulp tissue in the root canal to achieve the continuous root growth and development;the other is tissue engineering, new pulp dentin complex is regenerated by the stem cells under the induction of suitable biological active scaffolds and growth factors. This article reviews about the re⁃search progress and clinical characteristics of aforementioned two key parts.%个体患牙髓病或根尖周病后,年轻恒牙牙根的继续生长发育受阻,因此,如何保证患牙根尖的正常形成和继续生长发育对口腔医生而言极具挑战。近年来报道的牙髓再生治疗病例,其利用根管内残余牙髓组织、根尖周或牙周组织中干细胞的再生分化能力,在合适的条件诱导下再生出新的高度血管化并富含结缔组织的活髓,促使牙根继续生长发育,牙根长度增

  13. A case of congenital absence of numerous primary teeth treated with a denture for deciduous teeth

    OpenAIRE

    向井, 綾子; MUKAI, AYAKO

    2015-01-01

    Anomalies of the number of teeth include anodontia. The congenital absence of all teeth is called complete anodontia, and that of several teeth is called partial anodontia. Agenesis of numerous teeth causes a decrease in mastication and esthetic problems, and its treatment is often difficult.In the present paper, we report the case of a partial anodontia patient congenitally missing 6 primary teeth and some permanent teeth. The patient was treated using a denture for deciduous teeth to improv...

  14. The effect of fixed appliance and jaw pad for correction of permanent anterior teeth and maxillofacial region%固定矫治器加颌垫矫治恒前牙反颌的临床疗效

    Institute of Scientific and Technical Information of China (English)

    李黎

    2014-01-01

    目的:探讨固定矫治器加颌垫矫治恒前牙反颌的疗效。方法:收治恒前牙反颌患者29例,以固定矫治器联合后牙颌垫矫治器治疗,观察疗效。结果:解除反颌平均时间2~3个月,完成矫治12个月。结论:颌垫加固定矫正器在接触反颌的同时可排齐牙列,提高了治疗效果,缩短了疗程。%Objective:To explore the effect of fixed appliance and jaw pad for correction of permanent anterior teeth and maxillofacial region.Methods:29 patients with permanent anterior teeth and maxillofacial region were selected,and they were treated with fixed appliance and jaw pad.Observed the curative effect.Results:The average time of removing reverse jaw was 2 to 3 months,and the time of completing treatment was 12 months.Conclusion:Fixed appliance and jaw pad can contact the reverse jaw, at the same time,it can adjust the teeth to neat,so it improves the therapeutic effect and shortens the course of treatment.

  15. The Clinical Observation on Vital Pulpotomy in Young Permanent Molar Teeth%年轻恒磨牙龋源性露髓部分活髓切断的临床研究

    Institute of Scientific and Technical Information of China (English)

    崔玉华

    2014-01-01

    Objective:To explore the clinical efficacy of partial vital pulpotomy for pulp exposure of in-completely developed young permanent molars due to caries with Ca ( OH) 2 .Method:48 young permanent molar teeth underwent direct pulp capping and partial vital pulpotomy .All of them were followed up for 18 months, and then evaluated the effect with clinical symptom and X-ray examination result .Result:24 in 26 young permanent molar teeth underwent partial vital pulpotomy successfully , the success rate was 92.3%.17 in 22 young permanent molar teeth underwent direct pulp capping successfully , the success rate was 77.3%. Conclusion:It's an effective method to treat young permanent molar teeth due to caries with partial vital pul-potomy, Ca( OH) 2 is the ideal pulp capping agent .%目的:应用氢氧化钙对年轻恒磨牙龋源性露髓行部分活髓切断术,并评价临床效果。方法:对48颗因龋露髓的年轻恒磨牙行直接盖髓术和部分活髓切断术,随访18个月,通过临床检查和X线检查比较两组疗效。结果:26颗年轻恒磨牙龋源性露髓行部分活髓切断,成功24颗,成功率92.3%。22颗行直接盖髓术成功17颗,成功率77.3%。结论:部分活髓切断术是治疗因龋露髓年轻恒磨牙有效的方法,同时,氢氧化钙是较为理想的盖髓剂。

  16. An in vitro evaluation of the demineralization inhibitory effect of F? varnish and casein phosphopeptide-amorphous calcium phosphate on enamel in young permanent teeth

    OpenAIRE

    Duraisamy, Vinola; Xavier, Ananda; Nayak, Ullal Anand; Reddy, Venugopal; Rao, Arun Prasad

    2015-01-01

    Aims and Objectives: To determine the demineralization inhibitory potential of fluoride varnish and casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and to compare and evaluate the additive effect of fluoride varnish + CPP-ACP. Materials and Methods: Ten healthy premolar teeth that were extracted for orthodontic purposes were collected, and each tooth was longitudinally sectioned buccolingually and mesiodistally into four sections. The teeth were then assigned to four different tre...

  17. Supernumerary teeth in clinical practice

    Directory of Open Access Journals (Sweden)

    Anna K. Szkaradkiewicz

    2011-07-01

    Full Text Available Introduction: Hyperdontia is the condition of having supernumerary teeth, or teeth which appear in addition to the regular number of teeth. The prevalence rates of supernumerary teeth in the permanent dentition amounts 0.1-6.9%, and in deciduous dentition 0.4-0.8%. The presence of supernumerary teeth can be found in everyday dental practice.Case presentation: We describe 3 cases of patients with supernumerary teeth. First patient had supernumerary lateral incisor 12s, second - premolar fused, multicuspid, supernumerary deciduous tooth 64s of having several interconnected roots, and third - erupted odontoma between teeth 13 and 14. In all cases treatment involved the removal of the supernumerary tooth.Conclusions: The decision on proceeding with the supernumerary teeth should be based on the full clinical picture and interview. Early diagnosis and removal of supernumerary teeth allow to avoid or reduce possible complications.

  18. Management of multiple impacted teeth

    Directory of Open Access Journals (Sweden)

    Nidhi Bansal

    2012-01-01

    Full Text Available An impacted or missing permanent tooth can add significant complications to an otherwise straightforward case. When multiple impacted teeth are present, the case complexity increases further. Developing a treatment sequence, determining appropriate anchorage, and planning and executing sound biomechanics can be a challenge. The following case report illustrates a patient with three retained primary teeth and three impacted permanent canines. After careful treatment planning and extraction of multiple primary teeth;, followed by attempted guided eruption of impacted teeth, the patient finished with a significantly improved functional and aesthetic result.

  19. Alveolar process fractures in the permanent dentition. Part 2. The risk of healing complications in teeth involved in an alveolar process fracture

    DEFF Research Database (Denmark)

    Lauridsen, Eva; Gerds, Thomas; Andreasen, Jens Ove

    2016-01-01

    for PN (age, fracture in relation to apex, displacement, gingival injury, degree of repositioning, type of splint, duration of splinting, treatment delay, and antibiotics) were analyzed for mature teeth using Cox regression. The level of significance was 5%. RESULTS: Immature: No severe complications (PN.......3-3.5), P = 0.003), and age >30 years (HR: 2.3 (95% CI: 1.1-4.6), P = 0.02). The type of splint (rigid or flexible), the duration of splinting (more or less than 4 weeks), and the administration of antibiotics did not affect the risk of PN. CONCLUSION: Teeth involved in alveolar process fractures appear......AIM: To analyze the risk of pulp canal obliteration (PCO), pulp necrosis (PN), repair-related resorption (RRR), infection-related resorption (IRR), ankylosis-related resorption (ARR), marginal bone loss (MBL), and tooth loss (TL) for teeth involved in an alveolar process fracture and to identify...

  20. Defectos del esmalte, caries en dentición primaria, fuentes de fluoruro y su relación con caries en dientes permanentes Enamel defects, caries in primary dentition and fluoride sources: relationship with caries in permanent teeth

    Directory of Open Access Journals (Sweden)

    Ana Alicia Vallejos-Sánchez

    2007-06-01

    Full Text Available Objetivo: Explorar la relación entre la presencia de defectos del esmalte (DE, la experiencia de caries en la dentición temporal, y la exposición a diversas fuentes de fluoruros, con la presencia de caries en la dentición permanente de niños con dentición mixta. Material y métodos: Se realizó un estudio transversal en 713 sujetos de 6-9 años de edad de 4 escuelas de Campeche, México, mediante un cuestionario dirigido a las madres, y un examen clínico bucal a los niños. La variable dependiente fue la prevalencia de caries en la dentición permanente. Resultados: El promedio de dientes temporales cariados, extraídos y obturados (ceod y dientes permanentes cariados, perdidos y obturados (CPOD fue de 2,48 (2,82 (ceod > 0 = 58,9% y 0,40 (0,98 (CPOD > 0 = 18,2%, respectivamente. El índice SiC (índice de caries significativa, calculado en la dentición temporal fue de 5,85 para los niños de 6 años de edad. En el análisis de regresión logística multivariado permanecieron significativas, después de ajustar por variables de exposición a fluoruros, la mayor edad (odds ratio [OR] = 2,99, el ceod > 0 (OR = 5,46, la menor escolaridad de la madre (OR = 1,57 y una interacción entre sexo y defectos del esmalte. Conclusiones: Las caries en la dentición temporal y permanente fueron relativamente menores que las observaciones publicadas por otros estudios en México. Los resultados confirmaron que la caries en la dentición temporal se asoció fuertemente con la caries en la dentición permanente. No hubo una relación significativa entre las fuentes de fluoruro y la caries dental en la dentición permanente.Objective: To examine the relationship between the presence of enamel defects, dental caries in primary teeth, and exposure to various fluoride technologies and the presence of dental caries in permanent teeth in children with mixed dentition. Materials and methods: A cross-sectional study was conducted in 713 children aged 6-9 years old

  1. The application of rubber dam isolation method in the young permanent teeth pulpotomy%橡皮障隔离法在年轻恒牙牙髓切断中应用的效果评价

    Institute of Scientific and Technical Information of China (English)

    梅桂娟; 杭赛英; 陈玉梅

    2014-01-01

    Objective To evaluate the effect of rubber dam isolation method in the young permanent teeth pulpotomy.Methods 52 young permanent teeth appropriate for pulpotomy,were randomly divided into the experimental group and the control group with 26 teeth in each group.They adopted different isolation methods in young permanent teeth putpotomy.The operation time and the success rate after 3 months were observed and compared.Results Patients in the experimental group needed less operating time,and the success rate of pulpotomy was higher after 3 months,which was 1.25 times higher than that of the control group.The difference was significant.Conclusions Compared with the traditional nursing operation,rubber dam isolation method with nursing can reduce operation time,and has a remarkable curative effect,which is worth being promoted in clinical work.%目的 观察并评价橡皮障隔离法用于年轻恒牙牙髓切断术的优势.方法 选取适宜行牙髓切断术的患牙52颗,随机分为使用橡皮障隔离法护理组和常规护理组各26颗牙,分别采用不同的方法进行年轻恒牙牙髓切断术中的隔离,观察并比较2组操作时间、3个月后成功例数.结果 使用橡皮障隔离组,治疗时操作较对照组更省时,且3个月后患牙牙髓切断术成功率更高,为对照组的1.25倍,二者比较差异有统计学意义.结论 橡皮障隔离技术、护理四手操作应用于口腔内科治疗时,在减少医生操作时间的基础上,相较于传统护理操作更能够取得较佳疗效,值得推广.

  2. 恒牙撕脱性损伤临床特征的回顾性分析%A retrospective study about the clinical characteristics of avulsion of permanent teeth

    Institute of Scientific and Technical Information of China (English)

    王伟; 黄超; 刘艳丽; 赵寅华; 张旻; 陈永进

    2016-01-01

    目的:分析恒牙撕脱性损伤的分布特征。方法:对131名患者共179个撕脱性损伤患牙进行临床特征回顾性研究,包括年龄、性别、病因、牙保存方法、牙离体时间及是否伴有软硬组织伤等,并对观察半年以上且伴有牙槽骨骨折的撕脱性患牙愈后进行统计分析。结果:主要病因为摔伤(59%),好发于上颌中切牙(78%)。仅3%的人能够在30 min内就医;45%伴发软组织损伤;34%伴发牙槽骨骨折,其中10%牙槽骨骨折在初诊中被漏诊;撕脱性损伤伴牙槽骨骨折牙根吸收率略高于无牙槽骨骨折(P>0.05)。结论:多数患者由于就诊延误再植牙属于延迟再植;牙撕脱性损伤多伴发软硬组织的损伤,但撕脱性损伤患牙是否伴有牙槽骨损伤与其远期根吸收无明显关联。%AIM:To analyze the clinical characteristics of avulsion of permanent teeth.METHODS:A ret-rospective analysis was performed on the dental records of 131 patients with avolsion of 179 permanent teeth.The clinical data of avulsed teeth were collected,and the follow-up period was more than 6 months.The factors were analyzed in re-lation to postoperative outcomes.RESULTS:Wound in fall was the major reason for tooth avulsion (59%),and the maxillary incisors were the mainly avulsed permanent teeth(78%)Tooth avulsion was accompanied with injuries of the alveolar bone in 10% cases,with soft tissue injuries in 45% cases.Only 3% the avulsed teeth were replanted within 30 min at Emergency Department.10%alveolar bone fracture was not diagnosed at the first visit.Tooth avulsion accom-panied with and without injuries of alveolar bone on showed no stastitic significance in root resorption(P>0.05).CON-CLUSION:Most tooth replantation was delayed due to delayed clinical visit.Alveolar bone fracture may not be correla-ted with root resorption in avulsed permanent teeth.

  3. A retrospective study on pulpal tissue prognosis of avulsed permanent teeth in children%儿童恒牙全脱出牙髓组织预后的回顾性研究

    Institute of Scientific and Technical Information of China (English)

    白洁; 秦满; 赵玉鸣

    2015-01-01

    Objective:To analyze the pulpal prognosis of replanted permanent teeth in children and to examine the associated factors .Methods:The samples consisted of 67 children with 81 avulsed perma-nent teeth treated in Peking University Hospital of Stomatology from 2000 to 2012 .Their clinical data of the replanted teeth were collected , and the follow-up period was no less than 12 months.The pulpal prognosis was classified as pulp necrosis and pulp non-necrosis .Results: The replantation within 30 minutes after avulsion led to the most significant increase in pulpal healing (P<0.05).The dental pulp of 80% ( 4/5 ) young permanent teeth replanted within 30 minutes remained vital , while all the teeth replanted after 30 minutes developed pulp necrosis within 60 days after replantation .Conclusion: The extra-alveolar period significantly affects the prognosis of pulp in immature permanent teeth after replanta-tion.When the extra-alveolar period is more than 30 minutes, the chance of pulp revascularization after replantation is very low , therefore pulp extirpation should be performed .%目的:观察儿童恒牙全脱出后再植牙的牙髓组织预后类型,牙髓坏死出现的时间,分析影响再植牙牙髓组织预后的因素。方法:对2000年至2012年在北京大学口腔医院就诊的儿童恒牙全脱出且观察期大于12个月的病例进行回顾性研究,观察再植牙的牙髓组织预后方式,牙髓坏死、钙变出现的时间,分析影响再植牙预后的相关因素,并进行统计学分析。结果:超过30 min再植的全脱出牙再植后60 d内全部发生了牙髓坏死,且出现牙髓坏死的时间明显早于30 min内再植的全脱出牙(P<0.05);30 min内再植的牙齿80%(4/5)牙髓存活,主要表现为牙髓钙变。结论:离体时间会影响再植牙的牙髓组织预后,超过30 min再植的牙齿牙髓几乎没有存活机会,临床上应考虑施行牙髓摘除术。

  4. Prevalence of permanent teeth caries among primary and secondary school students in 2010 in Beijing%北京市2010年中小学生恒牙患龋情况分析

    Institute of Scientific and Technical Information of China (English)

    符筠; 段佳丽; 郭欣; 刘峥; 耳玉亮

    2012-01-01

    目的 了解北京市2010年中小学生恒牙患龋情况,为开展学校龋齿防治工作提供科学依据.方法 选取北京市6个区7,9,12,14,17岁5个年龄组的2976名在校学生,由口腔专业人员进行检查,并分为城市男生、城市女生、乡村男生、乡村女生4个群体进行统计.结果 2010年北京市中小学生恒牙患龋率为22.38%,患龋率随年龄增长而升高;龋均为0.46,12岁学生龋均为0.37;龋齿充填率为33.50%,乡村男生龋齿充填率最低,只有22.14%.结论 北京市学生龋齿防治工作取得了一定的成绩,龋均已控制在较低水平,但龋齿充填率还很低.应进一步加强口腔健康教育和龋齿充填工作.%Objective To analyze the prevalence of permanent teeth caries among primary and secondary school students in 2010 in Beijing, and to provide scientific bases for the prevention and control of permanent teeth caries among the students. Methods A total of 2 976 primary and secondary school students aged 7, 9,12,14,17 years were selected from six districts of Beijing. They were divided into four groups; urban male students, urban female students, rural male students and rural female students to study the prevalence of permanent teeth caries. The dental caries were examined by dental professionals. Results The prevalence rate of permanent teeth caries of primary and secondary school students of Beijing in 2010 was 22. 38% , the mean caries of 12 years group was 0. 37, the filling rate of dental caries was 33. 50% . The filling rate was lowest among rural boys( 22. 14% ). Conclusion Some achievements have already been got on preventing and controlling the dental caries of the students in Beijing in recent years. The mean caries has already been controlled at a lower level, but the filling rate of permanent teeth caries in students is still too low. The oral health education should be strengthened and the filling rate of dental caries should be improved among the students.

  5. The inter-relation between epithelial cells of Malassez and vessels studied immunohistochemically in the periodontal membrane of human primary and permanent teeth

    DEFF Research Database (Denmark)

    Bille, Marie-Louise Bastholm; Thomsen, Bjarke; Kjær, Inger

    2011-01-01

    Abstract Background. Only few immunohistochemical studies have focused on the periodontal membrane in human primary teeth. Recently, studies on epithelial cells of Malassez and innervation have been published. Studies on the inter-relation between vessels and the epithelial cells of Malassez are ...

  6. Clinical investigation of pulpotomy with Pulpdent Multi-Cal in young permanent anterior teeth%PulpdentMulti-Cal用于年轻恒前牙活髓切断术的临研究

    Institute of Scientific and Technical Information of China (English)

    白洁; 秦满; 姬爱平

    2011-01-01

    Objective:To investigate the clinical characteristics and prognosis of pulpotomy with Pulp-dent Multi-Cal (PMC) in young permanent incisors. Methods: Twenty-five young permanet incisors with vital pulps and complicated crown fractures were treated by pulpotomy with PMC at the Emergency Department of Peking University School and Hospital of Stomatology. The teeth were checked clinically and radiographically during fixed intervals. Healing of the pulp was considered to have taken place if the following criteria were met; absence of clinical symptoms, absence of apical radiolucency, continued root development in immature teeth, radiographic evidence of dentin bridge formation, and positive response to pulp vitality tests. The results were compared with the teeth which underwent pulpotomy with preparation made by our hospital. Results:Followed up for 6 -15 months (median 12 months) , on basis of the criteria for pulp healing, all teeth got successful treatment. And all the teeth showed radiographic evidence of dentin bridge formation within 1 to 3 months after pulpotomy. The operation time of PMC pulpotomy was significantly shortened (P <0.01). The root length of teeth performed with PMC pulpotomy and normal teeth had no significant difference (P >0. 05). Conclusion: PMC is an acceptable material when used in pulpotomy of young permanent teeth.%目的:研究Pulpdent Multi-Cal (PMC)盖髓剂用于活髓切断术的临床可操作性和疗效,为临床应用提供参考依据.方法:对因冠折露髓到北京大学口腔医院急诊科就诊患者的上颌年轻恒前牙25颗(20例患者)进行活髓切断术,用PMC盖髓剂作为活髓保存剂,观察临床可操作性和操作时间,术后对患牙进行定期随访观察,复诊时记录患牙的临床检查和X线片检查情况,并与采用北京大学口腔医院自制制剂进行活髓切断术的患牙进行比较.结果:随访6~15个月(中位时间12个月),25颗患牙(20例患者)均于1~3个月间

  7. New teeth from old: treatment options for retained primary teeth.

    Science.gov (United States)

    Robinson, S; Chan, M F W-Y

    2009-10-10

    Retention of primary teeth beyond their expected exfoliation date is encountered relatively frequently. Most commonly this is due to absence of the permanent successor. In this article patient assessment and the restorative treatment options are discussed with particular emphasis on retention of the primary tooth/teeth in the medium to long-term. The restorative techniques that may be used to improve aesthetics and function of retained primary teeth are illustrated. Consideration of this minimally invasive approach is commended in such cases.

  8. Keeping Your Child's Teeth Healthy

    Science.gov (United States)

    ... options than ever. A silver-colored material called amalgam (a special mix of metals) was once the substance of choice for most fillings in permanent teeth. But now, other materials like composite resins are becoming popular. Resins bond to the teeth ...

  9. 上海市金山区12岁学生恒牙龋病调查分析%Epidemiology of Dental Caries in Permanent Teeth among 12-Year-Old Students in .Iinshan District of Shanghai

    Institute of Scientific and Technical Information of China (English)

    张晓颖; 伍平群; 沈国荣

    2012-01-01

    Objective:To investigate the incidence and the risk factors of dental caries in permanent teeth among 12-year-old students in Jinshan district of Shanghai. Methods: A total of 4 052 students aged 12 in 27 middle schools in Jinshan district have been enrolled. All of them were examined for dental caries in permanent teeth. They also received a questionnaire survey,which included demographics data,oral health behaviors,dietary habits,etc. Results: The prevalence rate of dental caries was 30. 16% for permanent teeth among 12-year-old students in Jinshan district of Shanghai. The mean of decayed,missing and filled tooth(DMFT),significant caries index(SiC) and filling rate were 0. 46,1. 61 and 43. 55% > respectively. The prevalence rate of dental caries was higher in females than in males. Those students who brushed tooth less than twice per day and who enjoy sweet food and bedtime snack were at high risk for dental caries . Conclusions; The incidence of dental caries among 12-year-old students in Jinshan district of Shanghai showed a polarized distribution. It is important to take measures to prevent dental caries in high-risk population.%目的:了解上海市金山区12岁学生恒牙龋病的患病情况及其影响因素.方法:2010年对金山区27所中学的4052例12岁学生进行全口恒牙牙冠龋病情况检查,并进行问卷调查.问卷内容包括人口统计学资料、口腔卫生习惯和饮食习惯等.结果:上海市金山区12岁学生恒牙患龋率、龋均、龋齿充填率分别为30.16%、0.46和43.55%,显著性龋均指数(significant caries index,SiC)为1.61.女性学生、日刷牙频率小于2次、喜欢吃甜食、睡前吃零食者患龋率较高.结论:上海市金山区12岁学生恒牙龋患呈两级化分布,应进一步完善高危人群的龋病预防保健措施.

  10. A Meta analysis of flowable composite and flowable compomer in preventive resin restoration of permanent teeth%流动树脂及流动复合体用于恒牙预防性充填的Meta分析

    Institute of Scientific and Technical Information of China (English)

    康翠平

    2016-01-01

    目的:全面系统评价流动树脂/流动复合体用于预防性树脂充填术的临床疗效,为临床应用提供科学依据。方法:检索Pubmed等数据库,纳入国内外相关文献,资料提取和方法学质量评价后,采用Stata11.0软件对纳入文献进行Meta分析,通过漏斗图和Begg秩相关方法检验是否存在发表偏倚,同时进行敏感性分析。结果:纳入文献20篇,分析结果显示采用流动树脂/流动复合体与其他材料相比,在成功率和完全保留率方面,有显著性差异;在继发龋发生率方面,能显著降低发生率。结论:采用流动树脂/流动复合体用于预防性树脂充填治疗恒牙窝沟龋的修复效果显著优于其他材料,可以在临床中积极加以应用。%Objective: This study aims to evaluate the effectiveness of flowable composite or compomer in preventive resin restoration of pit and fissure caries in permanent teeth by Meta analysis, and provide scientific guide for the clinical application of them. Methods: Studies about flowable composite or flowable compomer used in preventive resin restoration to fill the pit and fissure caries of permanent teeth were identified from the follows: Pub Med, Cochrane library, OVID, Science Direct, CNKI, CBM and VIP databases. Meta analyses were performed by Stata software11.0. Results: Compared with other restoration materials, flowable composite or flowable compomer in preventive resin restoration improve the complete retention rate and the success rate significantly. Flowable composite or flowable compomer in preventive resin restoration reduce the incidence of secondary caries. Conclusion: The flowable composite or flowable compomer in preventive resin restoration is a clinical effective technology to fill pit and fissure caries of permanent teeth.

  11. Analysis the Effect of Pulp Revascularizationfor Immature Perma-nent Teeth with iRoot BP%iRoot BP用于年轻恒牙牙髓血运重建术的疗效分析

    Institute of Scientific and Technical Information of China (English)

    林琪; 姜醒; 马忠雄; 谢云德

    2015-01-01

    目的 评价iRootBP应用于牙髓血运重建术治疗年轻恒牙根尖周病变的临床效果,为临床治疗年轻恒牙根尖周病变提供新方法.方法 选取年轻恒牙牙髓坏死患者32例,随机分为治疗组和对照组各16例,两组均行均行牙髓血运重建术治疗,其中对照组采用MTA封闭根管上段,治疗组采用iRootBP封闭根管上段.比较两组患者临床疗效.结果 治疗组总有效率明显高于对照组,差异具有统计学意义(P<0.05);治疗组牙本质表面的牙骨质样组织的沉积率明显高于对照组,差异具有统计学意义(P<0.05).结论 iRootBP应用于牙髓血运重建术治疗效果可行,可作为牙髓感染或坏死、根尖孔未闭合年轻恒牙的一个新的治疗选择.%Objective The clinical effect evaluation of iRootBP in dental pulp revascularization in the treatment of young permanent teeth with periapical lesions,provide a new method for the treatment of young permanent teeth with periapical lesions.Methods A total of 32 cases of young permanent teeth with pulp necrosis were randomly divided into treatment group and control group with 16 cases in each group,two groups underwent pulp revascularization treatment,the control group used MTA root canal closed upper treatment group using iRootBP closed upper root canal.To compare the clinical effect of the two groups.Results The total effective rate of treatment group was significantly higher than the control group,the difference was statistically significant(P<0.05); treatment group,the dentin surface deposition of cementum like tissue was significantly higher than that of the control group,the difference was statistically significant (P<0.05).Conclu-sions The application of iRootBP in dental pulp revascularization in treating effect is feasible and can be used as endodontic infection or necrosis,apical foramen was not a new choice for the treatment of closed young permanent teeth.

  12. The effect of a chlorhexidine-fluoride varnish on mutans streptococci counts and laser fluorescence readings in occlusal fissures of permanent teeth

    DEFF Research Database (Denmark)

    Lipták, Lídia; Bársony, Nóra; Twetman, Svante

    2016-01-01

    informed consent. A double-blind split-mouth design was employed and 87 pairs of non-cavitated permanent molars were randomly assigned to treatments with either chlorhexidine- fluoride varnish (CHX-F) or chlorhexidine-thymol varnish (CHX-T, Cervitec Plus) as active control. The varnishes were topically......Objective: To evaluate the effect of a new chlorhexidinefluor ide varnish on mutans streptococci (MS) counts and laser fluorescence (LF) readings in fissures of permanent molars. Method and Materials: The study group consisted of 57 healthy schoolchildren (7 to 14 yrs) that volunteered after...... decrease (P varnishes. After 24 weeks, less than 5% exhibited high counts. There were no significant differences between the varnishes at any time point. The mean LF values were similar in both treatment groups at baseline, but a significant reduction (P

  13. Histological observation of pulpless immature permanent teeth after pulp revascularization%无髓年轻恒牙牙髓血运重建术的组织学研究

    Institute of Scientific and Technical Information of China (English)

    张映娟; 文春媚; 钟小奕; 陈文霞

    2016-01-01

    目的:对犬的非感染无髓年轻恒牙行牙髓血运重建术,并观察其根管内新生组织的组织学特征。方法:取5月龄健康杂种犬3只,分别选择其右侧上下颌第一、二、三前牙(牙根均未发育完成)作为实验组,并于拔除牙髓组织后进行牙髓血运重建术;左侧同名牙不作任何处理使之自然发育作为对照。术后3个月心内灌注法处死各动物,并用HE染色法观察各牙根管内新生组织的组织学构成。结果:术后3个月组织学观察结果显示,实验组所有样本的根管内壁上均有牙骨质样硬组织沉积,其中94.5%(17/18)的样本除根管内存在新生组织外,在其根尖部也可见硬组织沉积,且管腔有逐渐向根尖闭合的趋势;另有44.5%(8/18)的样本可在其管腔及根尖周观察到聚集成片的炎症细胞。实验组根管内所观察到的新生组织主要为牙骨质样组织、牙周膜样组织和骨样组织。结论:非感染的无髓年轻恒牙经牙髓血运重建术后,其根管内的新生组织主要是牙骨质样组织、牙周膜样组织和骨样组织。%AIM:To observe the histological characteristics of dental pulp in uninfected pulpless immature permanent dog teeth after pulp revascularization.METHODS:Three 5 -month old dogs were used.The dental pulps of the right maxillary and mandibular incisors and canines of the dogs were removed and revascularized.The dental pulps of the left corresponding teeth were untreated as the controls.3 months later,the animals were sacrificed and the teeth were sections for histological observation by HE staining.RESULTS:Histological observation showed that ce-mentum-like tissue was found in the walls of all canals in experimental teeth.Most of the test teeth had a histological evidence of apical closure.94.5%of the canals(17/18)revealed new vital tissue.Inflammatory infiltration was found in 8 of the 18 experimental canals and/or at

  14. 根管内血运重建用于年轻恒牙牙髓坏死的治疗%Revascularization treatment of immature permanent teeth with necrotic pulp

    Institute of Scientific and Technical Information of China (English)

    刘佳佳

    2012-01-01

    近年来随着生命科学、材料科学以及相关各学科的发展,人们对年轻恒牙的再生能力有了新的认识.再生性牙髓治疗作为牙髓坏死后一种新的治疗方式,因其可能带来的较传统治疗方法更为理想的预后开始成为研究的热点.其中根管内血运重建以其简便易行,成本相对较低,不涉及免疫排斥和伦理问题等优势获得了人们的关注.本文将就该治疗方式的发展历史及其在年轻恒牙牙髓坏死治疗中的应用等方面作一综述.%In recent years, with the development of life science, materials science and related disciplines, people have had a new understanding about the immature permanent teeth's ability to regenerate. The regenerative en-dodontics as a new treatment of pulp necrosis, which may bring more desirable outcomes than the conventional treatment, has become a research focus. As one of the regenerative treatments, pulp revascularization has advantages such as convenience, relatively low cost, lack of immune rejection and ethical issues involved and has gained attention. This article will review the history and the development of this method, as well as its application in the treatment of pulp necrosis of immature permanent teeth.

  15. Endodontic management of nonvital permanent teeth having immature roots with one step apexification, using mineral trioxide aggregate apical plug and autogenous platelet-rich fibrin membrane as an internal matrix: Case series

    Directory of Open Access Journals (Sweden)

    Vivek Sharma

    2016-01-01

    Full Text Available A tooth with blunderbuss canal and open apex can be an endodontic challenge because of difficulty in obtaining an apical seal, and existing thin radicular walls which are susceptible to fracture. To overcome the limitations of traditional long-term calcium hydroxide apexification procedures, nonsurgical one step apexification using an array of materials such as mineral trioxide aggregate (MTA has been suggested. However, adequate compaction of MTA in teeth with wide open apices can be an arduous task, and an internal matrix is required for controlled placement of MTA against which obturating material can be condensed. Platelet-rich fibrin (PRF, a second generation platelet concentrate containing several growth factors that promotes hard and soft-tissue healing, has been used as an internal matrix to create an apical plug of MTA and hence prevent extrusion of filling materials. This case series presents the endodontic management of immature permanent teeth with open apices using internal matrix of autologous PRF membrane and one step apical barrier placement of MTA.

  16. Atomic force microscopic comparison of remineralization with casein-phosphopeptide amorphous calcium phosphate paste, acidulated phosphate fluoride gel and iron supplement in primary and permanent teeth: An in-vitro study

    Directory of Open Access Journals (Sweden)

    Nikita Agrawal

    2014-01-01

    Full Text Available Context: Demineralization of tooth by erosion is caused by frequent contact between the tooth surface and acids present in soft drinks. Aim: The present study objective was to evaluate the remineralization potential of casein-phosphopeptide-amorphous calcium phosphate (CPP-ACP paste, 1.23% acidulated phosphate fluoride (APF gel and iron supplement on dental erosion by soft drinks in human primary and permanent enamel using atomic force microscopy (AFM. Materials and Methods: Specimens were made from extracted 15 primary and 15 permanent teeth which were randomly divided into three treatment groups: CPP-ACP paste, APF gel and iron supplement. AFM was used for baseline readings followed by demineralization and remineralization cycle. Results and Statistics: Almost all group of samples showed remineralization that is a reduction in surface roughness which was higher with CPP-ACP paste. Statistical analysis was performed using by one-way ANOVA and Mann-Whitney U-test with P < 0.05. Conclusions: It can be concluded that the application of CPP-ACP paste is effective on preventing dental erosion from soft drinks.

  17. Interrelationships in the Variability of Root Canal Anatomy among the Permanent Teeth: A Full-Mouth Approach by Cone-Beam CT

    Science.gov (United States)

    Peters, Ove A.; Maury, Elisabeth; Telmon, Norbert; Georgelin-Gurgel, Marie; Maret, Delphine

    2016-01-01

    Objectives In endodontic practice, clinicians should be aware of possible root canal anatomic variations. The aim of this study was to assess using CBCT acquisitions regarding whether one root canal anatomy of a tooth is associated with a specific anatomy of another tooth. Methods A total of 106 CBCT acquisitions were obtained using a CBCT scanner with 200μm voxel size. Numbers of roots and canals of the entire dentition were described. Bivariate analyses and logistic regressions were conducted to explore root canal anatomy on one tooth according to age, gender, jaw, side and the others teeth. Multiple correspondence analysis (MCA) was performed to correlate the different numbers of canals profiles. Results A total of 2424 teeth were analyzed. Independently from the other variables, the presence of an additional root canal on a mandibular incisor increases the risk of having an additional root canal on a mandibular premolar (OR [95%] 3.7 [1.0;13.2]). The mandibular molar variability increases in women compared to men (OR [95%] 0.4 [0.1; 0.9]). MCA showed correspondence between 2-canals maxillary incisor and canines and 5-canals maxillary molars, and some correlation between additional canal on maxillary and mandibular premolars. Conclusions Although CBCT examinations are conducted in the first intention of making a diagnosis or prognostic evaluation, medium FOV acquisitions could be used as an initial database thus furnishing preliminary evaluations and information. In endodontic practice, clinicians should be aware of possible root canal anatomic variations. The visualization of all canals is considered essential in endodontic therapy. The use of multi-correspondence analysis for statistics in endodontic research is a new approach as a prognostic tool. PMID:27764246

  18. The effect of a chlorhexidine-fluoride varnish on mutans streptococci counts and laser fluorescence readings in occlusal fissures of permanent teeth: A split-mouth study.

    Science.gov (United States)

    Lipták, Lídia; Bársony, Nóra; Twetman, Svante; Madléna, Melinda

    2016-01-01

    To evaluate the effect of a new chlorhexidine-fluoride varnish on mutans streptococci (MS) counts and laser fluorescence (LF) readings in fissures of permanent molars. The study group consisted of 57 healthy schoolchildren (7 to 14 yrs) that volunteered after informed consent. A double-blind split-mouth design was employed and 87 pairs of non-cavitated permanent molars were randomly assigned to treatments with either chlorhexidine-fluoride varnish (CHX-F) or chlorhexidine-thymol varnish (CHX-T, Cervitec Plus) as active control. The varnishes were topically applied at baseline and every sixth week throughout the 24-week study period. Endpoints were MS counts (CRT test) and occlusal LF readings (DIAGNOdent pen) registered regularly during follow-up. At baseline, > 50% of the occlusal fissures harbored high MS counts (≥ 105 CFU), but a significant decrease (P varnishes. After 24 weeks, less than 5% exhibited high counts. There were no significant differences between the varnishes at any time point. The mean LF values were similar in both treatment groups at baseline, but a significant reduction (P varnishes in terms of MS suppression after four applications over 24 weeks. Both varnishes also reduced the LF readings significantly compared with baseline, but further long-term studies are needed to confirm a caries-preventive effect.

  19. Variations in the vestibular cortical bone of permanent canine teeth in orthodontic patients. a comparative study: linear tomography vs. cbct (3d accuitomo).

    Science.gov (United States)

    Mateu, María E; Martínez, M E; Dagum, H; Benítez Rogé, Sandra C; Bruno, Gabriela I; Hecht, Pedro; Folco, Alejandra A

    2014-01-01

    The aim of this study was to compare the results of measuring the height of the vestibular cortical bone of canine teeth by linear tomography (LT) and 3-D Accuitomo cone beam computed tomography (CBCT) before and after aligning dental arches by orthodontic treatment. LT and CBCT were performed before and after orthodontic alignment on 12 canines in three patients undergoing orthodontic treatment, and the height of the canine vestibular cortical bones measured in mm. Measurements were taken by double-blinded operators. The mean variation in height of the vestibular cortical bone with orthodontic treatment was - 0,33 mm} 0.233 standard error using CBCT and -0,08mm } 0.55 standard error using LT. Analysis of variance (ANOVA) was performed to compare the techniques, the patients and upper and lower canines. No significant difference was found for any of the cases. Using LT to evaluate vestibular crest cortical bone in canines is comparable in efficiency to using CBCT. Height in millimeters is less in LT because image resolution is lower and when it is very thin it is not appreciable by this method.

  20. 去髓年轻恒牙牙髓组织再生的动物实验%Experimental study on pulp revitalization of Beagle dog′s immature permanent teeth after pulpectomy

    Institute of Scientific and Technical Information of China (English)

    杨剑珍; 欧阳勇; 廖志清

    2011-01-01

    Objective To observe the process of pulp revitalization of immature permanent teeth after pulpectomy. Methods Thirty-two single-rooted teeth with open apices from 4 Beagle dogs aged 4 months were included in the study. The pulpal tissues of 8 front teeth with single root of each dog were removed, and a blood clot was produced to the level of the cementoenamel junction followed by a double seal of mineral trioxide aggregate and composite resin. At day 7, 14, 21 and 28, respectively after operation, the dog was sacrificed, and then longitudinal paraffin sections were made for histologic investigation. ResultsAfter 7 days, about one thirth of the pulp chamber had an ingrowth of new tissue. After 14, 21, 28 days, there were more and more new tissue in the chamber. This new tissue consisted of well-organized and well-vascularized connective tissue. Hard tissue was too observed in the root canal. In some cases, the newly generated hard tissue even deposited against the canal dentinal walls. Conclusions The pulp of immature permanent teeth can revitalize after removal of the original pulp tissue under suitable conditions.%目的 观察年轻恒牙去髓后牙髓组织的再生状态,研究牙髓组织的再生过程,为进一步探讨牙髓组织的再生机制提供依据.方法 选取4只Beagle犬,每只犬8颗单根管上下颌切牙作为实验牙,拔除上下颌切牙牙髓并使血块充满髓腔,严密封闭开髓孔,分别于术后第7、14、21、28天处死动物,对牙齿及颌骨标本进行组织学观察.对照牙为2颗下颌切牙,未作任何处理.结果 实验第7、14、21、28天实验牙根管内均富含细胞、血管分化良好的新生组织长入,并随观察时间的延长而增多,28 d时新生组织基本长满髓腔.根尖部及根中部可见硬组织沉积,部分牙齿的根管内壁有钙化组织沉积,管壁增厚.对照牙根管内为正常牙髓组织.结论 在保持根管无菌并严密封闭开髓孔的情况下,Beagle犬年轻

  1. Dentist and practice characteristics associated with restorative treatment of enamel caries in permanent teeth: multiple-regression modeling of observational clinical data from The National Dental PBRN

    Science.gov (United States)

    Fellows, Jeffrey L; Gordan, Valeria V.; Gilbert, Gregg H.; Rindal, D. Brad; Qvist, Vibeke; Litaker, Mark S.; Benjamin, Paul; Flink, Håkan; Pihlstrom, Daniel J.; Johnson, Neil

    2014-01-01

    Purpose Current evidence in dentistry recommends non-surgical treatment to manage enamel caries lesions. However, surveyed practitioners report they would restore enamel lesions that are confined to the enamel. We used actual clinical data to evaluate patient, dentist, and practice characteristics associated with restoration of enamel caries, while accounting for other factors. Methods We combined data from a National Dental Practice-Based Research Network observational study of consecutive restorations placed in previously unrestored permanent tooth surfaces and practice/demographic data from 229 participating network dentists. Analysis of variance and logistic regression, using generalized estimating equations (GEE) and variable selection within blocks, were used to test the hypothesis that patient, dentist, and practice characteristics were associated with variations in enamel restorations of occlusal and proximal caries compared to dentin lesions, accounting for dentist and patient clustering. Results Network dentists from 5 regions placed 6,891 restorations involving occlusal and/or proximal caries lesions. Enamel restorations accounted for 16% of enrolled occlusal caries lesions and 6% of enrolled proximal caries lesions. Enamel occlusal restorations varied significantly (pEnamel proximal restorations varied significantly (penamel caries restorations can guide strategies to improve provider adherence to evidence-based clinical recommendations. PMID:25000667

  2. Prevalência de cárie em dentes permanentes de escolares do Município de São Paulo, SP, 1970-1996 Dental caries prevalence in permanent teeth of schoolchildren in Brazil, 1970-1996

    Directory of Open Access Journals (Sweden)

    Paulo C Narvai

    2000-04-01

    Full Text Available OBJETIVO: Estudar a evolução da prevalência de cárie em dentes permanentes da população infantil do Município de São Paulo, SP, no período 1970-1996, com base em levantamento epidemiológico em escolares das redes pública e privada de ensino. MÉTODOS: Utilizando metodologia recomendada pela Organização Mundial da Saúde, foram examinados 2.491 escolares de 103 unidades das redes de ensino público e privado. Foi obtida amostra probabilística, com base no cadastro das escolas do município. Os elementos amostrais foram identificados ao acaso. RESULTADOS: Observou-se que de uma situação de prevalência "muito alta" de cárie dentária nos anos 60 e 70, a população de referência evoluiu positivamente, na idade-índice de 12 anos, para um quadro de "baixa" prevalência. CONCLUSÃO: Entre 1986 e 1996 o declínio na cárie dentária, aos 12 anos de idade, foi da ordem de 68,2% entre escolares do Município de São Paulo.OBJECTIVE: To assess the evolution of dental caries in permanent teeth of schoolchildren in S. Paulo City, Brazil, during the period of 1970-1996. METHODS: The World Health Organization methodology for oral health surveys was applied in 2,491 shoolchildren, both male and female from 103 public and private schools. A probabilistic sample stratified by age, school category, and city zones was obtained by the Education State Service data system. Computational resources were used. RESULTS: Data from the 1996 S.Paulo survey were compared with others data provided by studies such as the one conducted in the same city and the reference-population in the second half of the 20th century. In the 60s and 70s the DMF-T Index among 12-year-old schoolchildren was around 7.0. In 1986 it was 6.5 and in 1996 it was registered 2.1, a decline of 68%. CONCLUSION: Dental caries in permanent teeth among S. Paulo City 12-year-old schoolchildren changed from a "very high" to "low" prevalence.

  3. Meta-analysis and systematic review of factors biasing the observed prevalence of congenitally missing teeth in permanent dentition excluding third molars.

    Science.gov (United States)

    Rakhshan, Vahid

    2013-10-01

    No meta-analyses or systematic reviews have been conducted to evaluate numerous potential biasing factors contributing to the controversial results on congenitally missing teeth (CMT). We aimed to perform a rather comprehensive meta-analysis and systematic review on this subject. A thorough search was performed during September 2012 until April 2013 to find the available literature regarding CMT prevalence. Besides qualitatively discussing the literature, the meta-sample homogeneity, publication bias, and the effects of sample type, sample size, minimum and maximum ages of included subjects, gender imbalances, and scientific credit of the publishing journals on the reported CMT prevalence were statistically analyzed using Q-test, Egger regression, Spearman coefficient, Kruskal-Wallis, Welch t test (α=0.05), and Mann-Whitney U test (α=0.016, α=0.007). A total of 111 reports were collected. Metadata were heterogeneous (P=0.000). There was not a significant publication bias (Egger Regression P=0.073). Prevalence rates differed in different types of populations (Kruskal-Wallis P=0.001). Studies on orthodontic patients might report slightly (about 1%) higher prevalence (P=0.009, corrected α=0.016). Non-orthodontic dental patients showed a significant 2% decline [P=0.007 (Mann-Whitney U)]. Enrolling more males in researches might significantly reduce the observed prevalence (Spearman ρ=-0.407, P=0.001). Studies with higher minimums of subjects' age showed always slightly less CMT prevalence. This reached about -1.6% around the ages 10 to 13 and was significant for ages 10 to 12 (Welch t test P0.2). Studies' sample sizes were correlated negatively with CMT prevalence (ρ=-0.250, P=0.009). It was not verified whether higher CMT rates have better chances of being published (ρ=0.132, P=0.177). CMT definition should be unified. Samples should be sex-balanced. Enrolling both orthodontic and dental patients in similar proportions might be preferable over sampling from

  4. Occlusal caries diagnosis in permanent teeth: an in vitro study Diagnóstico de cárie oclusal em dentes permanentes: estudo in vitro

    Directory of Open Access Journals (Sweden)

    Gisele Angnes

    2005-12-01

    Full Text Available The reduction in caries prevalence has not occurred uniformly for all dental surfaces. As the occlusal surfaces are still the most likely sites for the development of lesions, new methods of diagnosis are still being evaluated. This study compared a laser fluorescence (LF system (DIAGNOdent with the Ekstrand’s visual system for in vitro detection of occlusal caries. A total of 57 extracted molars with macroscopically intact occlusal surfaces were selected. Two-examiners assessed 110 sites by visual inspection (VI and LF. After ten days from the first measurement, all teeth were re-evaluated through the same methods by each examiner. Caries extension was histologically assessed (X 40. The methods were compared by means of sensitivity, specificity, intra- and inter-examiner reproducibility and area under the ROC curve. The kappa’s test showed good intra- and inter-examiner reproducibility for both methods. VI and LF showed similar sensitivities for both examiners, however, VI showed higher specificities than LF. The overall analysis, as demonstrated by the area under the ROC curve, showed that VI had a better performance than the LF device. It was concluded that the Ekstrand’s visual system is more reliable than the LF device. LF should be considered only as an adjuvant for occlusal caries diagnosis.A redução da prevalência de cáries não ocorreu uniformemente para todas as superfícies dentárias. Como as superfícies oclusais ainda são as mais susceptíveis ao desenvolvimento de lesões, novos métodos de diagnóstico ainda estão sendo avaliados. Este estudo comparou um sistema de fluorescência a laser (DIAGNOdent - DD com o método visual de Ekstrand na detecção de cárie oclusal. Um total de 57 terceiros molares com superfícies oclusais macroscopicamente intactas foram selecionados. Dois examinadores examinaram 110 sítios por inspecção visual (IV e DD. Após dez dias da primeira mensuração, todos os dentes foram novamente

  5. A 25-year-old man with 50 teeth: Astonishing but true!!

    OpenAIRE

    Bhatia, Vishwas; Jain, Nitul; Bhatia, Garima; Garg, Rakesh

    2013-01-01

    Retained primary teeth is a well-known process but multiple retained primary, permanent, and supernumerary teeth that too in an asymptomatic, non-syndromic patient is a rare possibility that has rarely been reported in literature. This case report discusses the clinical and radiographic details along with treatment options in a 21-year-old patient having a total number of 50 teeth, i.e., 16 retained primary teeth, 32 permanent teeth, and 2 supernumerary teeth without being associated with any...

  6. Evaluation of the therapeutic effect of fluoride varnish Duraphat for incipient carious lesions in permanent anterior teeth%氟保护漆Duraphat治疗前牙初期龋损的临床效果

    Institute of Scientific and Technical Information of China (English)

    辛蔚妮; 许青峰

    2014-01-01

    Objective To assess the therapeutic effect of fluoride varnish Duraphat on the performance of incipient carious lesions white spot lesions (WSL) in anterior teeth in vivo. Methods The sample included 120 children aged 7 to 13 years old , with a total of 146 active WSL in permanent anterior teeth. The children were randomly divided into 3 groups, according to the treatment received:Group A (fluoride varnish Duraphat+oral health instrument, n=52), Group B (oral health instrument, n=47) and Group C (control, n=47). Maximum WSL dimensions (mesiodistal and incisogingival) were measured in millimeters by a previously calibrated single examiner using a periodontal probe . The oral hygiene was assessed by the plaque index . Results Wilcoxon test revealed a statistically significant difference (χ2=29.1,P<0.001) between the initial size and final size in A group (1.53 vs. 0.88) and B group (1.56 vs. 1.47). Pearson′s chi-square test revealed statistically significant differences (χ2=42.5, P<0.001) in the caries activity of the WSL among three groups. Conclusions The fluoride varnish Duraphat is effective to the incipient carious lesions in permanent anterior teeth .%目的:探讨氟保护漆Duraphat对前牙初期龋损白垩色斑块的治疗效果。方法共纳入并分析120例患者146个前牙唇侧白垩斑病损,分为三组:A组(涂氟保护漆Duraphat+口腔健康教育组,n=52),B组(口腔健康教育组,n=47)和C组(对照组,n=47)。由同一位已经过培训的医生采用牙周探针对白垩斑的直径及龋活动性进行评估,同时对研究对象的口腔卫生采用改良菌斑指数进行评估。结果 A组在接受2年的涂氟治疗后其白垩斑直径明显缩小,与另外两组差异有统计学意义(χ2=29.1,P<0.001),初期龋损白垩色斑块活动性龋的比例明显下降(χ2=42.5,P<0.001)。结论氟保护漆Duraphat能有效治疗光滑面的初期龋损。

  7. Early eruption of permanent canines.

    Science.gov (United States)

    Madhu, S

    2012-01-01

    Systemic and local factors can modify the eruption time of teeth. Generalized eruption time changes could be due to some systemic diseases like hyperthyroidism, hypophosphatasia, precocious puberty, Proteus syndrome, etc. Localized early eruption of permanent teeth could be due to early extraction of deciduous teeth. Presented here is an extremely rare case of early eruption of permanent canines in a 7-year old female child. Though the number of such cases is very limited, the clinician should poses adequate knowledge and keeps an open eye to identify such cases.

  8. Early eruption of permanent canines

    Directory of Open Access Journals (Sweden)

    S Madhu

    2012-01-01

    Full Text Available Systemic and local factors can modify the eruption time of teeth. Generalized eruption time changes could be due to some systemic diseases like hyperthyroidism, hypophosphatasia, precocious puberty, Proteus syndrome, etc. Localized early eruption of permanent teeth could be due to early extraction of deciduous teeth. Presented here is an extremely rare case of early eruption of permanent canines in a 7-year old female child. Though the number of such cases is very limited, the clinician should poses adequate knowledge and keeps an open eye to identify such cases.

  9. Observation of effect of using mineral trioxide aggregate to prevent external resorption in traumatic permanent anterior teeth%预防性使用MTA控制外伤恒前牙牙根外吸收的临床疗效观察

    Institute of Scientific and Technical Information of China (English)

    周中苏

    2013-01-01

    目的:探讨牙根发育完成的外伤冠折露髓恒牙使用MTA预防性控制根吸收的临床疗效.方法:对109颗牙根发育完成的冠折露髓恒牙随机分为预防性使用MTA治疗组(55颗)和常规治疗组(54颗),完成根管治疗.2年后,通过临床症状及X线根尖片判断疗效.结果:预防性使用MTA治疗组控制根吸收成功率为98.07%,对照组成功率为86.00%,两组间比较差异有统计学意义(P<0.05).结论:外伤恒前牙使用MTA预防性控制根吸收临床疗效好,值得临床应用.%Objective:To evaluate the effect of using mineral trioxide aggregate to prevent external resorption in traumatic permanent anterior teeth.Method:55 traumatic permanent anterior teeth with completed apices referred to our hospital for root canal treatment received an procedure with MTA,and 54 traumatic permanent anterior teeth was filled with gutta-flow.Patients were recalled after 2 years to evaluate the effect.Result:The success rate of MTA group was 98.07 % and control group was 86.00 %.There was significant different in two groups (9 < 0.05).Conclusion:The effect of MTA in preventing external resorption of traumatic permanent anterior teeth is effective,MTA is worth clinical applying.

  10. Clinical Efficacy Comparison of MTA and Vitapex in Apexification for Young Permanent Teeth%MTA及Vitapex在年轻恒牙根尖诱导成形术中的应用价值对比观察

    Institute of Scientific and Technical Information of China (English)

    强海燕

    2015-01-01

    Objective To study the clinical efficacy comparison of MTA and Vitapex in apexification for young permanent teeth .Methods 150caseswithyoungpermanentendodonticinfectionfromJuly,2014toJuly,2015wereregardedastheresearchobjects.And they were randomly divided into two groups ( MTA group and Vitapex group ) ,according to the different apexification materials.MTA group chose MTA material, and Vitapex group chose Vitapex material.After 3 months and 6 months, the effect was assessed.Results After 3 months, the total effective rate was 96.4%in MTA group;while the total effective rate was 95.0%in the Vitapex group.After 6 months, the total effective rate was 94.0 %in MTA group;while the total effective rate was 95.0%in the Vitapex group.Conclusion MTA and Vitapex are superior in the induction of permanent apical ideal material , and it is worthy of clinical use and promotion.%目的:探讨观察MTA及Vitapex在年轻恒牙根尖诱导成形术中的应用价值对比情况。方法选择2014-07~2015-07间来我院就诊的150例年轻恒牙牙髓感染的患者作为研究对象。根据治疗选择的根尖诱导材料的不同,将所有患者按随机抽样的方法分为MTA组和Vitapex组,Vitapex组的根尖诱导材料为Vitapex,MTA组选择MTA作为根尖诱导材料。3个月及6个月后,根据患者的临床检查评定疗效。结果经过治疗3个月后,MTA组总有效率为96.4%,Vitapex组总有效率为95.2%;治疗6个月后,MTA组总有效率为94.0%,Vitapex组总有效率为95.2%。结论 MTA和Vitapex两种材料在行年轻恒牙根尖诱导成形术中应用效果均较为优越,是恒牙根尖诱导中理想的材料,值得临床推广和应用。

  11. Prospective analysis of pulp vascular regeneration in treatment of infected permanent teeth in adolescent%牙髓血管化再生对成人感染性年轻恒牙的临床预后分析

    Institute of Scientific and Technical Information of China (English)

    单俊文; 单梓南; 何志伟

    2015-01-01

    Objective To analyze the effect of pulp vascular regeneration on the prognosis of infected permanent teeth in adolescent.Methods 98 adolescent patients with infected permanent teeth were selected from July, 2012 to July, 2013. The patients were randomly divided into an observation group and a control group, 49 cases for each group. The observation group were treated with pulp vascular regeneration and the control group apeciifcation. The efifcacy and prognosis were observed.ResultsBoth groups were effectively followed up (13.9 ± 2.7) months. 3 cases (6.1%) had postoperative pain in the observation group and 5 (10.2%) in the control group, with no statistical difference. The total effective rate was 93.9% in the observation group and 71.4% in the control group, with a statistical difference (P0.05). 18 weeks’ follow-up after surgery showed neither obvious change nor apical shadow in apex radicis dentis in the observation group.Conclusions Dental pulp vascular regeneration can effectively improve the clinical symptoms of infection in adult patients with young permanent teeth, which helps promote the continued root development and enhance root structure. However, the treatment effect largely depends on the patient's condition and the characteristics. And the treatment method is still at starting stage. The focus of clinical research is how to improve the adaptation scope of the method and the curative effect in next period of time.%目的:分析牙髓血管化再生对成人感染性年轻恒牙临床预后的影响。方法选取我院2012年7月至2013年7月收治的98例成人感染性年轻恒牙患者,按照随机数字表分为观察组及对照组,各49例,分别实施牙髓血管化再生及根尖诱导成形术,观察临床疗效及预后。结果两组患者均获得有效随访,平均随访时间(13.9±2.7)个月;观察组发生术后疼痛3例,发生率6.1%,对照组发生术后疼痛5例,发生率10.2%,两组患者术后疼

  12. False Teeth

    African Journals Online (AJOL)

    FOMCS2

    More than 80% of the respondents used traditional medicine alone or in combination with modern .... Table 2. Perceived causes of false teeth and millet disease in Bushenyi district ..... “Killer” canine removal and its sequelae in Addis Ababa.

  13. Teething Tots

    Science.gov (United States)

    ... some may seem cranky for weeks, with crying spells and disrupted sleeping and eating patterns. Teething can ... it can't break into small pieces. A wet washcloth placed in the freezer for 30 minutes ...

  14. Finnegan's teeth

    OpenAIRE

    Cowan, Judith

    2009-01-01

    Finnegan's Teeth is a visual journey seen through the eyes of the animal, Finnegan. Taking place around King's Cross in London, it follows the area as it goes through construction and deconstruction. Photographs of the happenings and events that Finnegan notices on his travels accompany the voices of the street life around him. Finnegan's Teeth is the title of a recently published book by artist Judith Cowan, which has now developed into a major public Art project. This takes Finnegan's ...

  15. Multiple Unerupted Permanent Teeth Associated with Noonan ...

    African Journals Online (AJOL)

    Some individuals with NS develop mandibular cysts, which can mimic ... The present report describes a case of Noonan's syndrome from a dental viewpoint. Noonan ... The patient is undergoing fixed orthodontic therapy for forced eruption of.

  16. 儿童恒牙全脱出牙周组织预后的回顾性研究%Retrospective study about periodontal ligament healing of replanted permanent teeth in children

    Institute of Scientific and Technical Information of China (English)

    白洁; 赵玉鸣; 秦满

    2015-01-01

    Objective:To analyze the prognosis about periodontal ligament healing of replanted perma-nent teeth in children and to examine the associated factors.Methods: The sample consisted of 49 children with 61 avulsed permanent teeth, whose injuries had been managed in the period from 2000 to 2012.The clinical data of replanted teeth were collected, and the follow-up period was no less than 12 months .The factors were analyzed in relation to postoperative outcomes, classified as functional periodon-tal healing ( FH ) , infection-related ( inflammatory ) resorption ( IRR ) and replacement resorption ( RR) .Results:The functional healing rate was 23.0%, while replacement resorption rate was 72.1%. The replacement resorption ( ankylosis ) was usually observed earlier by clinical examination than by radiographic examination.86.0% (40/47) resorptive processes were diagnosed within the first year. Physiological storages, such as milk, saline and saliva were significantly better to periodontal ligament healing than nonphysiological storages, such as tap water and sterilizing solutions ( chloramine and alco-hol) .Functional healing was found significantly more frequent in canines and premolars.Conclusion:The factor significantly affecting periodontal ligament healing is storage medium.Replacement resorption is the most common type of root resorption.The replacement resorption diagnosis must combine the radio-graphic examination with the clinical examination.It is better to follow up more than 1 year after tooth re-plantation.%目的:对儿童恒牙全脱出后再植的病例进行回顾性研究,观察再植牙的牙周组织预后类型和各类根吸收出现的时间,分析影响再植牙牙周组织预后的可能因素。方法:对2000年至2012年在北京大学口腔医院就诊的儿童恒牙全脱出系统病历进行回顾性研究,要求观察期大于12个月,记录再植牙的预后和各类牙根吸收出现的时间,分析影响再植牙预后的相

  17. Analyses of 1100 supernumerary teeth in a nonsyndromic Turkish ...

    African Journals Online (AJOL)

    2015-03-02

    Mar 2, 2015 ... of deciduous teeth, delayed eruption of permanent teeth, ectopic ... incisors, cyst development, and root resorption of adjacent teeth.[12] The ... analysis of the largest number of ST cases in the literature. The aim of this study ...

  18. Supernumerary and supplemental teeth: case report.

    Science.gov (United States)

    Lo Giudice, G; Nigrone, V; Longo, A; Cicciù, M

    2008-06-01

    This is to report the case of a ten year old child affected by a numeric dental anomaly showing the pathologic condition characterised by the simultaneous presence of supernumerary and supplemental teeth. The anomaly was analysed to plan the best surgical and orthodontic treatments. Dental history, clinical and instrumental examinations were made to perform a correct orthodontic examination and diagnosis. A young patient was affected by numeric dental anomaly in the upper jaw. We observed a high number of teeth, specifically two normally formed supplemental lateral permanent incisors and an unerupted mesiodens placed between the upper central incisors. Firstly, the supplemental lateral teeth were extracted. This surgical therapy and the application of a space maintainer were made to permit the eruption of the permanent canines. Then the mesiodens also underwent surgical treatment (i.e. extraction). Eventually, physiologic eruption of permanent teeth was allowed by the planned surgical-orthodontic treatment. Aim of the surgical-orthodontic treatment was extraction of the unerupted supernumerary teeth to obtain the physiologic eruption of the permanent ones. Orthodontic treatment is important to solve malocclusions and maintaining the space for the eruption of permanent teeth. Aesthetics and function are two important parameters in modern dentistry. All clinicians should try to make a correct and rational diagnosis for both simple and complex dental pathologies. Particularly in young children, invasive and surgical disinclusive techniques can be substituted by interceptive orthodontic treatments.

  19. 三氧化矿物凝聚体牙髓切断术治疗年轻恒牙不可复性牙髓炎的初步研究%Mineral trioxide aggragate pulpotomy for the treatment of immature permanent teeth with irreversible pulpitis: a preliminary clinical study

    Institute of Scientific and Technical Information of China (English)

    彭楚芳; 赵玉鸣; 杨媛; 秦满

    2015-01-01

    目的 评估三氧化矿物凝聚体(mineral trioxide aggragate,MTA)牙髓切断术治疗年轻恒牙不可复性牙髓炎的临床效果,为年轻恒牙不可复性牙髓炎的治疗提供新思路.方法 选取北京大学口腔医学院·口腔医院儿童口腔科就诊的26例患者,对其临床诊断为不可复性牙髓炎的26颗年轻恒牙应用MTA作为盖髓剂,根据切断牙髓部位的出血情况行部分或全部冠髓切断,术后1年随访,通过临床和X线片检查评估治疗效果.结果 术后1年,4例患者失访,其他22例患者(共计22颗患牙)进行了复查.22颗牙中20颗牙判为治愈或有效,临床成功率为91%(20/22);13颗牙在X线片上可见钙化桥,钙化桥形成率为65%(13/20).结论 MTA牙髓切断术是治疗年轻恒牙不可复性牙髓炎的有效方法,但长期疗效还需进一步观察.%Objective To evaluate the preliminary clinical effect of mineral trioxide aggragate (MTA) pulpotomy on immature permanent teeth with irreversible pulpitis.Methods Twenty-six immature permanent teeth with irreversible pulpitis were recuited from Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology.These teeth were treated with partial or full pulpotomy according to the condition of pulp bleeding.MTA was used as pulp capping material.Patients were recalled periodically after the treatment.Clinical and radiographic effects were evaluated.Results At one year follow-up, 20 teeth were evaluated as healed or healing, 2 teeth were evaluated as failure and 4 teeth were dropped out.The success rate was considered 91%(20/22).A dentinal bridge was radiographcally observed underneath the pulpotomy site in 13 teeth(65%, 13/20).Conclusions MTA pulpotomy is an effective method for the treatment of immature permanent teeth with irreversible pulpitis.But further research with longer follow up period is required.

  20. Ectopic eruption of permanent incisors after predecessor pulpectomy: five cases.

    Science.gov (United States)

    Tannure, Patricia Nivoloni; Fidalgo, Tatiana Kelly da Silva; Barcelos, Roberta; Gleiser, Rogerio; Primo, Laura Guimaraes

    2011-01-01

    Pulpectomy in primary teeth is a common technique that preserves teeth in the oral environment and maintains or recovers periapical tissues to a healthy condition. This article describes the ectopic eruption of permanent incisors whose primary predecessors underwent pulpectomy using ZOE filler paste. In a group of 135 teeth that received pulpectomy therapy due to caries, 10 primary maxillary incisors had overretention and were followed for at least 3.5 years (mean time of 4.2 years), both clinically and radiographically, until the permanent teeth erupted. The proposed treatment included extraction of the overretained primary incisors based on permanent successor eruption chronology and contralateral eruption. Seven permanent teeth erupted ectopically. Autocorrection of the permanent tooth positions was observed in five cases. It can be concluded that periodic clinical and radiographic assessments are essential to verify radicular and filling paste resorptions and to avoid overretention and any subsequent malocclusion.

  1. Immunohistochemical studies of the periodontal membrane in primary teeth

    DEFF Research Database (Denmark)

    Bille, Marie-Louise Bastholm; Nolting, Dorrit; Kjær, Inger

    2009-01-01

    Objectives. To describe the periodontal membrane of human primary teeth immunohistochemically, while focusing on the epithelial layer of Malassez, fibers, and peripheral nerves, and to compare the findings with those of a previous study of human permanent teeth. Material and methods. Nineteen human...... could be identical to those in regions with no resorption. Conclusion. In regions without resorption, spatial organization of the periodontal membrane of primary teeth was similar to that of permanent teeth, although the number and distribution of epithelial cells and fibers differed. In regions...

  2. Application of Quartz SphinTM high Strength Quartz Fiber and Nursing in Young Permanent Teeth after Dental Trauma%Quartz SphinTM高强度石英纤维应用于年轻恒牙外伤固定的护理配合

    Institute of Scientific and Technical Information of China (English)

    杨璐; 刘映伶; 王丹; 徐庆鸿

    2016-01-01

    年轻恒牙外伤是造成儿童牙齿缺损或缺失的一大原因,年轻恒牙由于牙根尚未发育完成,外伤时容易发生移位,正确有效的固定是治疗成功的关键。现目前常用的固定方法分为:树脂夹板固定、钢丝+树脂夹板固定、钛链夹板固定、正畸托槽+钢丝固定、高强度石英纤维+树脂固定。Quartz SphinTM高强度石英纤维夹板具有固位力强、操作方便、舒适美观、对口腔软硬组织无不良刺激等优势,相较于其他固定方式,易于被医生和患者接受,本文就2015年以来我科应用高强度石英固位纤维条进行年轻恒牙外伤固定的护理配合的情况作以论述。%Falls during play account for most injuries to young permanent teeth. Complex injuries to immature permanent teeth and their periodontium require immediate repositioning and stabilization. Different types of splints have been used to stabilized traumatized teeth in children including composite and wire splints, composite and ifshing line splints, orthodontic wire and bracket splints, titanium trauma splints and arch bar splints.Quartz SphinTM high strength quartz ifber is identiifed as fuliflling the requirements of an ideal splinting adhesive material because of its ease of application, ability to stand physical forces during the splinting period, and most importantly beneift to the healing. In this article, the use of Quartz SphinTM high strength quartz ifber and nursing for traumatized immature permanent teeth is described.

  3. 南京市城区12岁学生恒牙龋危险因素的Logistic回归分析%Logistic regression analysis of risk factors of permanent teeth caries in 12-year-old students in urban areas of Nanjing

    Institute of Scientific and Technical Information of China (English)

    王世超; 沈家平; 周红艳; 刘怡然; 沈红

    2012-01-01

    Objective To analyze the influencing factors of permanent teeth caries in 12-year-old students to provide evidence for caries prevention programs. Methods Sample 750 12-year-old students with multi-stage, random and cluster sampling method from urban areas of Nanjing and carry out oral examination and questionnaire to investigate their demographics, oral hygiene and food habits. Logistic regression analysis was used to analyze the results. Results Female, drinking milk, carbonated beverage, and eating sweet food like candy or chocolate are the risk factors of permanent teeth caries; brushing teeth can reduce caries occurrence. Conclusions We should strengthen and promote the oral health education and its publicity,as well as the right eating and oral hygiene habits.%目的 分析影响12岁学生恒牙龋病流行的相关因素,为开展龋病预防工作提供依据.方法 采用多阶段、随机、整群抽样的方法抽取南京市城区小学12岁学生共750例进行问卷调查及口腔检查,调查内容包括:人口学状况、口腔卫生习惯、饮食习惯等.采用Logistic回归分析对调查结果进行分析.结果 “女性”,“喝牛奶”,“碳酸饮料”,“吃糖果/巧克力等甜食”是恒牙龋发生的危险因素;刷牙可以减少龋病发生.结论 应加强学生口腔健康教育工作,养成良好的饮食习惯和口腔卫生习惯.

  4. Intrusive luxation of 60 permanent incisors

    DEFF Research Database (Denmark)

    Tsilingaridis, Georgios; Malmgren, Barbro; Andreasen, Jens O;

    2012-01-01

      Intrusive luxation in the permanent dentition is an uncommon injury but it is considered one of the most severe types of dental trauma because of the risk for damage to the periodontal ligament, pulp and alveolar bone. Management of intrusive luxation in the permanent dentition is controversial....... The purpose of this study was to evaluate pulp survival and periodontal healing in intrusive luxated permanent teeth in relation to treatment alternatives, degree of intrusion and root development....

  5. Dental Interventions on First Permanent Molars

    OpenAIRE

    2016-01-01

    The first permanent molars have the biggest dental morbidity and mortality of all permanent teeth. The main aim was to evaluate of the most common dental problems and procedures that are performed on the first permanent molars. Material and method: examination was performed in three private dental offices, two from urban and one from rural region, over a period of 2 years. The data was obtained by using dental charts from the patients and by the ambulatory register for performe...

  6. Torque Improvement Method of Unequal Tooth Widths in Permanent Magnet Motors With Multiple Slots and Few Poles and Different Phase Windings Wound on Alternate Teeth%不等齿宽提高多槽少极隔齿隔相绕组永磁电机转矩的方法

    Institute of Scientific and Technical Information of China (English)

    彭兵; 夏加宽; 董婷; 王成元

    2012-01-01

    In some special applications, low speed direct drive, high torque density of electric machine was required. Traditional structure of teeth and slots, which had the same width of teeth, restricted the relationship between magnetic load and linear load, so this became the bottleneck to realize high torque density. In order to improve the torque output ability of the electric machine with similar pole and slot number, teeth of the stator could be designed with alternately unequal tooth widths and tooth top widths. This paper adopted alternately unequal tooth widths and tooth top widths to improve the torque of permanent magnet synchronous motor (PMSM) with different phase windings wound on alternate teeth, educed the expression of magnetic flux of armature teeth by analyzing the circuit and magnetic structure of the electric machine with fewer pole number and different phase windings wound on alternate teeth, revealed the reason why unequal tooth widths could improve the torque. At last, the torque and magnetic flux density of armature teeth and armature teeth without coil. Analytical results show that using alternately unequal tooth widths and tooth top widths can improve the winding coefficient, reduce the saturation of stator teeth, and considerably improve the torque of the electric machine with fewer pole number and different phase windings wound on alternate teeth.%在一些特殊的低速直接驱动应用场合,要求电机要有较高的转矩密度.传统等齿宽近极槽永磁同步电机的齿槽结构约束磁负荷和线负荷的关系,成为其实现高转矩密度的瓶颈.为提高近极槽永磁同步电动机的转矩输出能力,采用交替不等齿宽和齿顶宽提高多槽少极隔齿隔相绕组永磁电机的转矩.通过分析多槽少极隔齿隔相绕组永磁电机的电路和磁路结构,推导了电枢齿齿磁通的解析表达式,揭示了交替不等齿宽提高电机转矩的本质.最后利用Ansoft有限元仿真软件分析了96

  7. Wisdom Teeth Management

    Science.gov (United States)

    Wisdom Teeth Management Wisdom teeth, or third molars, are the last teeth to develop and appear in your mouth. They come ... of third molars, disease status, and to suggest management options ranging from removal to a monitored retention ...

  8. Wisdom Teeth Management

    Science.gov (United States)

    Wisdom Teeth Management Wisdom teeth, or third molars, are the last teeth to develop and appear in your mouth. They come ... of third molars, disease status, and to suggest management options ranging from removal to a monitored retention ...

  9. Late Developing Supernumeraries in a Case of Nonsyndromic Multiple Supernumerary Teeth

    OpenAIRE

    Mine Bozkurt; Tugba Bezgin; Ayşegül Tüzüner Öncül; Rukiye Göçer; Şaziye Sarı

    2015-01-01

    Objective. This case report presents 3-year follow-up of a case of nonsyndromic multiple supernumerary teeth (NSMST) with 11 supernumerary teeth, 2 of which showed subsequent formation. Case Report. A 10-year-old girl was referred to the dental clinic with the chief complaint of delayed eruption. Radiographic examination showed 9 retained supernumerary teeth. The treatment plan consisted of extraction of the supernumerary teeth and associated primary teeth in order to allow the permanent tee...

  10. Bacteriological analysis of necrotic pulp and fistulae in primary teeth

    OpenAIRE

    FABRIS, Antônio Scalco; Nakano, Viviane; Avila-Campos,Mario Júlio

    2014-01-01

    Objectives: Primary teeth work as guides for the eruption of permanent dentition, contribute for the development of the jaws, chewing process, preparing food for digestion, and nutrient assimilation. Treatment of pulp necrosis in primary teeth is complex due to anatomical and physiological characteristics and high number of bacterial species present in endodontic infections. The bacterial presence alone or in association in necrotic pulp and fistula samples from primary teeth of boys and gir...

  11. Effects of mineral trioxide aggregate on the proliferation and differentiation of human pulp cells from primary and permanent teeth%三氧化矿物凝聚体对乳、恒牙牙髓细胞增殖和分化影响的比较

    Institute of Scientific and Technical Information of China (English)

    王敏永; 刘鹤; 李盛林; 秦满

    2015-01-01

    目的:对比三氧化矿物凝聚体(MTA)和氢氧化钙对人乳、恒牙牙髓细胞增殖和分化的影响。方法采用甲基噻唑基四唑(MTT)法检测牙髓细胞生长增殖变化;实时荧光定量聚合酶链反应(PCR)检测碱性磷酸酶(ALP)、牙本质涎磷蛋白(DSPP)、骨保护因子(OPG)、核因子κB受体活化因子配体(RANKL)基因的表达。结果氢氧化钙组乳、恒牙牙髓细胞增殖均显著低于对照组(P0.05)。恒牙牙髓细胞氢氧化钙组ALP和DSPP的表达与对照组相比无显著差异(P>0.05),MTA组ALP和DSPP的表达显著增加(P0.05)。结论 MTA比氢氧化钙更适合做乳牙和恒牙的盖髓剂,其优势在乳牙可能更为明显。%Objective This study aims to investigate the effects of mineral trioxide aggregate (MTA) and calcium hydroxide on proliferation and differentiation of human pulp cells from primary and permanent teeth. Methods Cell proliferation was detected by methyl thiazolyl tetrazolium (MTT) assay. The mRNA expression levels of dentinogenesis-related factors, including alkaline phosphatase (ALP) and dentin sialophosphoprotein (DSPP), and odontoclastogenesis-related factors, such as osteo-protegerin (OPG) and receptor activator of NF-κB ligand (RANKL), were determined by real time polymerase chain reac-tion (PCR). Results Primary and permanent pulp cells treated with calcium hydroxide exhibited significantly lower proli-feration rates than the control cells (P0.05). Likewise, MTA-treated permanent pulp cells showed significantly upregulated ALP and DSPP expression (P0.05). Neither MTA nor calcium hydroxide affected OPG and RANKL expression in per-manent pulp cells (P>0.05). Conclusion MTA is more suitable as a pulp-capping agent, particularly in primary teeth, than calcium hydroxide.

  12. 局部用奥威尔凝胶对酸性饮料导致年轻恒牙脱矿和再矿化的影响%Effect of Oravive gel on enamel remineralization and anti-demineralization of young permanent teeth treated by sugar drink

    Institute of Scientific and Technical Information of China (English)

    王瑜; 龚玲; 计艳

    2012-01-01

    Objective To evaluate the effect of Oravive gel and fluor protectors on remineralization and the capacity of resisting sugar drink erosion. Methods The changes of surface microhardness (SMH) of young permanent teeth treated by Oravive gel or fluor protectors which were immersed in sugar drink in advance were measured. The morphological changes of surface were observed by scanning electron microscope (SEM). Results The SMH values of the young permanent teeth immersed in sugar drink and then treated with Oravive gel or fluor protectors increased significantly, and the Oravive group was stronger than fluor protectors group (P〈0.05). For the young permanent teeth treated with Oravive gel or fluor protectors and then immersed in sugar drink, the SHM value of Oravive group was significantly higher than fluor protectors group (P〈0.05). Under SEM, the enamel surface appeared solvation and remineralization after Oravive gel or fluor protectors treatment. Conclusion Oravive gel may enhance the resistance of young permanent teeth enamel to sugar drink erosion, and promote the remineralization effects of demineralized enamel.%目的 比较局部使用奥威尔凝胶或氟保护漆对年轻恒牙抵抗饮料酸蚀及酸蚀后脱矿釉质再矿化的影响.方法 观测年轻恒牙的釉质经饮料浸泡后再经奥威尔凝胶或氟保护漆局部处理,或奥威尔凝胶及氟保护漆处理后再经饮料浸泡的表面显微硬度(SMH)变化;应用扫描电子显微镜(SEM)观察各组釉质的表面形态.结果 饮料浸泡后再经奥威尔凝胶或氟保护漆局部处理的年轻恒牙,其釉质的SMH明显增加(P<0.05),奥威尔凝胶组的SMH高于氟保护漆组(P<0.05).奥威尔凝胶或氟保护漆处理釉质表面后再经饮料浸泡,奥威尔凝胶组的SMH高于氟保护漆组(P<0.05).SEM下可见各组釉质表面经饮料及奥威尔凝胶或氟保护漆处理后呈现不同程度的釉质溶解和再矿化.结论 年轻恒牙釉质表面应

  13. Survey on the Prevalence of Permanent Teeth Caries in Mongolia and Han Children Aged 12 Years Old and the Analysis of the Related Factors%蒙汉两族12岁年龄组恒牙龋患病情况调查及相关因素分析

    Institute of Scientific and Technical Information of China (English)

    傅昭然; 李芳凝; 史文宗; 江世萍

    2011-01-01

    [Objective] To understand the prevalence of permanent teeth caries in Mongolia and Han children aged 12 years old in two middle schools of Xilinhot in Inner Mongolia in order to provide the relevant information for oral health care in this city. [Methods]According to the Guideline for the 3rd National Oral Health Survey, the stratified random sampling method was applied to draw 1243 subjects aged 12 years old form Mongolia middle schools of Xilinhot in Inner Mongolia. The epidemiological study on oral health status was performed. [Results] The prevalence rate of permanent teeth caries in Mongolia children aged 12 years old was 37.69 % which was significantly lower than that in Han children(54. 81 %)( P <0.05). The mean value of permanent teeth caries in Mongolia children was 0.88 which was significantly lower than that in Han children ( P <0.05). There was significant difference in the caries prevalence rate among different gender of children in 12-year-old group in Mongolia and Han people( P <0.05). The mean value of permanent teeth caries in school girls was significantly higher than that in school boys( P <0.05). The caries prevalence rate and mean value in 12-year-old group in the locality were higher than those in the whole country. [Conclusion] Reinforcement of oral health education, augmentation of oral health knowledge and good food habits have some effect on the pathogenesis of caries.%[目的]了解内蒙古锡林浩特市两所中学蒙汉两族12岁年龄组人群恒牙龋病情况,为本市口腔卫生保健提供相关信息.[方法]按照,采用分层随机抽样的方法,抽取内蒙古锡林浩特市蒙古族中学12岁年龄组1 243人,进行口腔健康状况的流行病学调查.[结果]蒙族12岁年龄组人群恒牙患龋率37.69%显著低于汉族54.81%(P<0.05),蒙族恒牙龋均0.88显著低于汉族1.32(P<0.05);不同性别蒙汉两族12岁年龄组患龋率存在差异(P<0.05),女生龋均显著高于男生(P<0.05);

  14. Late Developing Supernumeraries in a Case of Nonsyndromic Multiple Supernumerary Teeth

    Directory of Open Access Journals (Sweden)

    Mine Bozkurt

    2015-01-01

    Full Text Available Objective. This case report presents 3-year follow-up of a case of nonsyndromic multiple supernumerary teeth (NSMST with 11 supernumerary teeth, 2 of which showed subsequent formation. Case Report. A 10-year-old girl was referred to the dental clinic with the chief complaint of delayed eruption. Radiographic examination showed 9 retained supernumerary teeth. The treatment plan consisted of extraction of the supernumerary teeth and associated primary teeth in order to allow the permanent teeth to erupt. After 2 years of follow-up, 2 additional supernumerary teeth were observed. Conclusion. Regular follow-up for late forming supernumeraries is crucial for NSMST cases.

  15. Bilateral supernumerary teeth in deciduous dentition-a rarity.

    Science.gov (United States)

    Acharya, Sonu; Ghosh, Chiranjit; Mondal, Pradeep Kumar

    2014-05-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition and more often seen in males. A supernumerary tooth in the primary dentition can cause ectopic or delayed eruption of permanent central incisors which will further alter occlusion and may compromise esthetics and formation of dentigerous cysts. Here we discuss a case of bilateral supernumerary teeth in deciduous dentition in a female child.

  16. Supernumerary teeth: Report of four unusual cases

    Directory of Open Access Journals (Sweden)

    Arun Kumar

    2012-01-01

    Full Text Available Supernumerary tooth denotes duplication of tooth in the normal series. It is a developmental anomaly and has been argued to arise from multiple etiologies. These teeth may remain embedded in the alveolar bone or can erupt into the oral cavity. The supernumerary tooth might cause esthetic and/or functional problems, especially if it is situated in the maxillary anterior region. Complications reported were delayed or prevented eruption of succedaneous teeth, displacement or rotation, crowding of the affected region, abnormal diastema, dilacerations, cystic formation, and sometime eruption into the nasal cavity. In this case report, four unusual cases of supernumerary teeth that resulted in varying degrees of disturbances in permanent dentition are presented. Conservative surgical intervention and light orthodontic forces were used to bring the teeth into normal position with minimal disturbance to the surrounding oral structures.

  17. Supernumerary teeth: Report of four unusual cases.

    Science.gov (United States)

    Kumar, Arun; Namdev, Ritu; Bakshi, Lokesh; Dutta, Samir

    2012-04-01

    Supernumerary tooth denotes duplication of tooth in the normal series. It is a developmental anomaly and has been argued to arise from multiple etiologies. These teeth may remain embedded in the alveolar bone or can erupt into the oral cavity. The supernumerary tooth might cause esthetic and/or functional problems, especially if it is situated in the maxillary anterior region. Complications reported were delayed or prevented eruption of succedaneous teeth, displacement or rotation, crowding of the affected region, abnormal diastema, dilacerations, cystic formation, and sometime eruption into the nasal cavity. In this case report, four unusual cases of supernumerary teeth that resulted in varying degrees of disturbances in permanent dentition are presented. Conservative surgical intervention and light orthodontic forces were used to bring the teeth into normal position with minimal disturbance to the surrounding oral structures.

  18. Supernumerary Teeth in Primary Dentition and Early Intervention: A Series of Case Reports

    Science.gov (United States)

    Bahadure, Rakesh N.; Thosar, Nilima; Jain, Eesha S.; Kharabe, Vidhi; Gaikwad, Rahul

    2012-01-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition. Mesiodens is the most common type of supernumerary teeth but rarely seen in lower arch. Early recognition and diagnosis of supernumerary teeth is important to prevent further complications in permanent dentition. Four cases of supernumerary teeth with mesiodens in upper and lower arch in primary dentition and their management have been discussed. PMID:22888456

  19. Supernumerary Teeth in Primary Dentition and Early Intervention: A Series of Case Reports

    Directory of Open Access Journals (Sweden)

    Rakesh N. Bahadure

    2012-01-01

    Full Text Available Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition. Mesiodens is the most common type of supernumerary teeth but rarely seen in lower arch. Early recognition and diagnosis of supernumerary teeth is important to prevent further complications in permanent dentition. Four cases of supernumerary teeth with mesiodens in upper and lower arch in primary dentition and their management have been discussed.

  20. Supernumerary teeth in primary dentition and early intervention: a series of case reports.

    Science.gov (United States)

    Bahadure, Rakesh N; Thosar, Nilima; Jain, Eesha S; Kharabe, Vidhi; Gaikwad, Rahul

    2012-01-01

    Supernumerary teeth are considered as one of the most significant dental anomalies during the primary and early mixed dentition stages. They are of great concern to the dentists and parents because of the eruption, occlusal, and esthetic problems they can cause. Supernumerary teeth occur more frequently in the permanent dentition but rarely in primary dentition. Mesiodens is the most common type of supernumerary teeth but rarely seen in lower arch. Early recognition and diagnosis of supernumerary teeth is important to prevent further complications in permanent dentition. Four cases of supernumerary teeth with mesiodens in upper and lower arch in primary dentition and their management have been discussed.

  1. An evaluation of factors associated with persistent primary teeth.

    Science.gov (United States)

    Aktan, Ali Murat; Kara, Isa; Sener, Ismail; Bereket, Cihan; Celik, Salih; Kirtay, Mustafa; Ciftçi, Mehmet Ertugrul; Arici, Nursel

    2012-04-01

    The aim of the present study was to investigate the reasons for the persistence of primary teeth and also use panoramic radiography to determine the characteristics of persistence teeth. Four-hundred and twenty-six panoramic radiographies, which diagnosed one or more retained primary teeth, were selected from 100,577 panoramic radiographic image files from nine clinics and six different cities in Turkey. The selected radiographies were evaluated to determine the reasons for the persistence of primary teeth; furthermore, this study analyzed the characteristics of the retained primary teeth including tooth type, number, location, and root resorption, and whether, or not, the primary teeth showed evidence of pathological conditions, such as periodontal problems, caries, ankylosis, infra-occlusions, or tipping of the adjacent permanent teeth. Six hundred and seventy-seven retained primary teeth were determined in 426 patients (148 males and 278 females). Retained primary teeth were found most frequently in the mandible rather than the maxilla and the left side was more frequently affected than the right side. Level 1 was found as a most frequently encountered root resorption level. Within the limitation of the present study, the most common type of persistent primary teeth seen on the dental arch were mandibular primary second molars, followed by maxillary primary canines. The most frequent reason for the persistence was the congenital absence of successors to the primary teeth, followed by impaction of the successor teeth.

  2. Análisis de la simetría del tamaño dentario mesiodistal de la misma muestra en dentición mixta y permanente: Estudio longitudinal Analysis of symmetry mesiodistal size teeth in mixed and permanent dentition in the same sample: A longitudinal study

    Directory of Open Access Journals (Sweden)

    M.D. Austro Martínez

    2004-12-01

    Full Text Available En el presente trabajo se estudian los diámetros mesiodistales de los dientes temporales y permanentes de la misma muestra y se analiza la existencia de simetría entre dientes homólogos. Dicho estudio fue realizado inicialmente sobre una muestra de 267 niños con dentición mixta, 90 (34% niñas y 177 (66% niños, de Andalucía Oriental, con edades comprendidas entre 8 y 10 años, transcurridos cuatro años volvimos a analizar a los mismos niños con dentición permanente, y sólo obtuvimos una muestra de 171, de los cuales 69 (40% eran niñas y el 102 (60% niños, con una edad media de 12 años y un rango de 11 a 13 años, el 21 % de la muestra tenía 11 años, el 46,29% presentaba una edad de 12 y el 32% de 13 años, utilizándose como criterios de selección, que no tuvieran alteraciones morfológicas, pérdida dentarias, apiñamientos importantes, entre otros factores. El tamaño dentario se midió, como la máxima distancia entre los puntos de contacto mesial-distal de la corona, utilizándose un calibre de punta fina, con una precisión de 0,1 mm. Todas las mediciones fueron realizadas por el mismo observador, directamente en boca, utilizando luz natural y espejos desechables. El análisis estadístico incluyó pruebas como la "t" de Student, con un nivel de significación estadística de pIn the present work is analysed the mesiodistal diameters of the temporal and permanent teeth of the same sampie to calculate the symmetry. The first sample was 267 children, 90 girls (34% and 177 (66% boys from Oriental Andalusia, aged between 8 and 10 years old. After four years, we analysed the same children with permanent teething and we obtained just a sample of 171, 69 girls (40% and 102 (60% boys, with an average age of 12 years and a range from 11 to 13 years, using as criteria selection not having morphological alteration, teeth loss, important congestions, between other elements. The teething dimension was measured as the maximum distance

  3. MTA与Vitapex治疗年轻恒牙根尖周炎伴根尖闭合不全的临床疗效比较%Comparison of clinical effect of MTA and Vitapex for young permanent teeth with periapical incomplete apical closure

    Institute of Scientific and Technical Information of China (English)

    周颖蕊; 王津惠; 高海龙

    2015-01-01

    Objective To compare clinical effect of MTA and Vitapex for young permanent teeth with periapical incomplete apical closuret . Method Teeth 90 were chosen from 80 patients at 7-25 years old young permanent teeth with periapical and randomly divided into MTA group and Vitapex group 45 in each group.Two groups were treated with MTA and Vitapex paste treatment respectively.6-month and 12-month after treatment followed up, observed clinical efficacy of two groups.Results The six-month recall, X-ray ( MTA group 93.33%, Vitapex group 88.89%) and clinical parameters (MTA group 95.56%, Vitapex group 86.67%) success rate of two group was no significant difference.When the 12-month followed up, X-ray examination of MTA group's success rate was 93.33%, significantly higher than 68.89%Vitapex group (P<0.05), clinical indicators of success rate of 95.56%MTA group,significantly higher than the 71.11%Vitapex group (P<0.05).Pain during root canal therapy (EIP) of the occurrence, MTA group than Vitapex group (P<0.05).Conclusion The effect of short-term treatment of MTA in treatment of young permanent teeth with periapical incomplete apical closure is definite,it is an ideal induce apical molding material.%目的:比较无机三氧化矿物凝聚体( mineral trioxide aggregate ,MTA)与Vitapex糊剂治疗恒牙根尖周炎伴根尖闭合不全的临床效果。方法选择天津市口腔医院综合门诊7~25岁年轻恒牙根尖周炎伴根尖闭合不全患者80例,患牙90颗,随机分别为MTA组和Vitapex组各45颗,分别采用MTA和Vitapex糊剂治疗,治疗后6个月和12个月复诊,观察疗效。结果6个月复诊时,2组X线( MTA组93.33%、Vitapex组88.89%)和临床指标( MTA组95.56%、Vitapex组86.67%)的成功率差异均无统计学意义。12个月复诊时,MTA组的X线检查的成功率为93.33%,明显高于Vitapex 组的68.89%( P <0.05), MTA 组的临床指标成功率为95.56

  4. 'In vitro' assessment to instrumented indentation hardness tests in enamel of bovine teeth, before and after dental bleaching by laser; Avaliacao in vitro' de ensaios instrumentados de dureza em esmalte de dente bovino, antes e apos clareamento dental a laser

    Energy Technology Data Exchange (ETDEWEB)

    Britto Junior, Francisco Meira

    2004-07-01

    The laser enamel bleaching is a common used procedure due to its satisfactory esthetic results. The possible changes on the dental structures caused by the bleaching technique are of great importance. The enamel superficial microhardness changes through instrumented indentation hardness on bovine teeth were analyzed in this present study. The samples were divided in two halves, one being the control and the other irradiated with a diode laser (808 nm) or with a Nd:YAG laser (1064 nm) to activate the Whiteness HP bleaching gel (hydrogen peroxide at 35%). It was possible to conclude that there was a statistical significant increase on the enamel superficial microhardness (Group I, sample 1 and Group II, sample 1) despite this increase did not seem to indicate a concern regarding the enamel surface resistance change. There was not a significant statistical change on the enamel microhardness on the other samples. The final conclusion is that there was no superficial enamel morphological change after these treatments. (author)

  5. Rare occurrence of bilaterally impacted mandibular supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Vinay Kumar Bhardwaj

    2012-01-01

    Full Text Available Introduction: Supernumerary teeth are present in addition to the normal complement of teeth in permanent or deciduous dentitions. Incidence is high in permanent dentition, affects both the gender. They are more common in males, with the male to female ratio of 2:1. When the supernumerary teeth are causing problems such as, extensive resorption of adjacent teeth, hindering the eruption or malposition of permanent teeth, early surgical intervention is recommended. Case Report: A case of bilaterally impacted supernumerary premolars was reported when an orthopentomograph view was taken which revealed the presence of additional teeth impacted in relation to 35-36 and 45-46. Surgical removal was done as they were resorbing the roots of teeth in their vicinity. Discussion: Literature reports increased occurrence of the supernumeraries in the maxilla but supernumerary premolars are more likely to develop in the mandible. Etiology of supernumerary teeth is ambiguous and is due to following conditions:atavism or reversion, heredity, aberrations during embryologic formation, progress zone, and unified etiologic explanation.

  6. Strontium in 19th century Australian children's teeth

    Science.gov (United States)

    Williams, A.-M. M.; Donlon, D. A.; Bennett, C. M.; Siegele, R.

    2002-05-01

    The enamel of teeth from 57 children, who died in the mid to late 1800s, were analysed to investigate strontium (Sr) concentrations in historic teeth. Teeth were analysed using proton induced X-ray emission at the Australian Nuclear Science and Technology Organisation (ANSTO). Where available, multiple teeth were analysed for each individual including permanent (molars and premolars) and deciduous teeth (molars). Preliminary results show that Sr does not appear to be affected by the postmortem environment. Sr levels in permanent molars strongly correlate with levels in the premolars but not with the deciduous molars. Concerns are raised over the large variation seen in Sr levels and the effect it would have on the interpretation of Sr levels in studies with small sample sizes.

  7. Factors influencing trace element composition in human teeth

    Energy Technology Data Exchange (ETDEWEB)

    Tandon, L. [Los Alamos National Lab., NM (United States); Iyengar, G.V. [Biomineral Sciences International, Inc., Bethesda, MD (United States)

    1997-12-01

    The authors recently compiled and reviewed the literature published in or after 1978 for 45 major, minor, and trace elements in human teeth as a part of an International Atomic Energy Agency (IAEA) study. The purpose of this paper is to discuss the various factors that influence the concentration levels of certain trace elements in human teeth. The sampling practices and analytical techniques that are applicable for trace element analysis are also discussed. It is also our intention to identify reference range of values, where data permit such conclusions. The scrutiny was designed to identify only the healthy permanent teeth, and values from teeth with fillings, caries, or periodontal diseases were eliminated.

  8. Avaliação da microdureza superficial do esmalte e da dentina de dentes bovinos e humanos: permanentes e decíduos = Surface microhardness evaluation of enamel and dentin in bovine and human teeth: permanent and deciduous

    Directory of Open Access Journals (Sweden)

    Donassollo, Tiago Aurélio

    2007-01-01

    Full Text Available O objetivo desse estudo foi testar a microdureza superficial do esmalte (E e da dentina (D em molares humanos decíduos (grupo d, molares humanos permanentes (grupo p e incisivos bovinos (grupo b. Foram selecionados 4 espécimes de cada tipo de dente os quais foram mantidos em solução salina até o teste. Os espécimes foram incluídos em uma matriz com resina e polidos com papel metalográfico (até granulação 600 para planificar o esmalte. O teste de dureza Knoop foi realizado em um microdurômetro com carga de 200 g, sendo realizadas 5 leituras (10 s de endentação por dente. Os espécimes foram novamente submetidos ao polimento para expor dentina (próxima ao LAD, sendo novas leituras realizadas. Os dados foram submetidos à análise estatística (testes ANOVA e Tukey. Os valores médios de dureza (kg/mm2 e desvio padrão foram os seguintes: Ed 338 ± 30,1; Ep 341 ± 32,8; Eb 326 ± 25,5; Dd 104 ± 9,7; Dp 93,3 ± 8,7; Db 91,2 ± 7,3. A dureza do esmalte foi maior que a da dentina nos três tipos de dentes (p < 0,001. Considerando o tipo de substrato, não houve diferenças estatísticas, ou seja, os valores de dureza para esmalte ou dentina foram similares para dentes humanos decíduos e permanentes e dentes bovinos

  9. ESTHETICS IN PRIMARY TEETH

    National Research Council Canada - National Science Library

    Mathew Renu Ann

    2013-01-01

    .... Esthetic restoration of primary anterior teeth can be especially challenging due to the small size of the teeth, close proximity of pulp to tooth surface, relatively thin enamel and surface area...

  10. 下颌恒牙主根尖孔偏移的体外研究%An in vitro study on the position of the major apical foramen in mandibular permanent human teeth

    Institute of Scientific and Technical Information of China (English)

    陈晨; 姜岚; 高学军; 梁宇红

    2013-01-01

    Objective To determine the location of the major foramen and the deviation distance from the anatomical root apex in human mandibular teeth.Methods A total of 162 madibular root specimens (194 major apical foramen)were examined under optical stereomicroscope.The distance from the anatomical apex to the most occlusal point of the major foramen was measured using a micrometric scale with an accuracy of 0.01 mm.The deviation of the major foramen from the anatomical apex was classified as central or lateral (buccal,lingual,mesial,or distal).Results In 44.3 % (86/194) of specimens,the major apical foramen deviated from root apex.The most frequent deviations of the foramen were in mandibular premolars 56.5% (26/46) and to the distal 15.5% (30/194).Fourteen point nine percent(29/194) of the major apical foramens were deviated to the buccal and lingual positions.The mean distance between the major foramen and the anatomical root apex was 0.32 mm(range:0-1.88 mm).The mean distance was larger in molars (0.37 mm;range:0-1.88 mm) and smaller in anterior teeth(0.24 mm;range:0-1.2 mm).Conclusions Forty-four point three percent of major foramens deviated from apex in mandibular teeth,and the mean distance of deviation was 0.32 mm.The most frequent deviations of the foramen were to the distal.%目的 观察下颌恒牙主根尖孔偏移根尖的位置和偏移距离,为临床根管治疗中确定工作长度提供参考.方法 利用立体显微镜观察162颗离体恒牙(前牙74颗,前磨牙46颗,磨牙42颗,北京大学医学部解剖与组织胚胎学系提供)的194个主根尖孔开口的位置和方向,使用二维图像测量软件(Image Measure,CF-2000C,上海长方光学仪器有限公司)在镜下使用显微标尺精确到0.01 mm测量每个牙根的主根尖孔偏移解剖根尖的距离.结果 44.3% (86/194)的下颌牙主根尖孔偏移解剖学根尖位置,开口于根尖侧方,前磨牙根尖孔开口于侧方比例最高为56.5% (26/46).下颌牙主根

  11. Effects of Saliva and Topical Fluoride Application on Enamel of Young Permanent Teeth Demineralized by Carbonated Beverage%唾液及氟化物对碳酸饮料导致年轻恒牙釉质脱矿的影响

    Institute of Scientific and Technical Information of China (English)

    周娟; 许明莲; 杜姗姗; 胡孝丽; 罗志晓; 柴红波; 朱友家

    2013-01-01

    Objective To explore the remineralization of young permanent teeth demineralized by carbonated beverage with human saliva and topical fluoride application. Methods Thirty young permanent premolar were collected from orthodontic extraction and immersed in carbonated beverage for one week,then they were randomly divided into group A,B and C(n = 10). All teeth were cleaned with distilled water,and then put into normal human saliva,0.1% NaF solution and toothpaste with fluoride for one month,respectively. The morphology changes of enamel surface were observed by scanning electron microscope, and the results was analyzed. Results The enamel surface of group A showed uneven distribution of the mineral particle,which was cloudy covering in the lacunae making the aperture smaller and the depth shallower;the enamel surface of group B showed discrete and irregular settlings with piece or mass form covering in the lacunae, making the depth shallower; the enamel surface of group C showed flat,the depth of demineralization area was superficial,there was some compact and irregular settlings, the degree of demineralization of axon cylinder was obviously reduced, and the density of good mineralization position was close to normal enamel. Conclusion After demineralizing young permanent teeth with carbonated beverage, the remineralization could occur in oral environment within limited degree. The application of fluoride in enamel surface can promote the remineralization.%目的:探讨碳酸饮料处理过的年轻恒牙分别在正常人体唾液中,和经氟化物处理后,牙釉质的再矿化情况.方法:收集因正畸减数拔除的年轻恒前磨牙30颗,置入碳酸饮料中浸泡1周后,将其随机分为3组,用蒸馏水洗净后,分别置入正常人体唾液(A组)、0.1% NaF溶液(B组)及含氟牙膏(C组)中1个月,应用扫描电镜观察各组牙齿牙釉质表面的形态学变化,并对影像结果进行对比分析.结果:A组牙齿的釉质表面有分布不

  12. MTA for the treatment of infected dental pulp blood clinical study of Immature permanent teeth reconstruction%MTA 用于牙髓血运重建术治疗感染年轻恒牙的临床研究

    Institute of Scientific and Technical Information of China (English)

    罗伟坚

    2016-01-01

    目的:探讨无机三氧化物聚合体(MTA)应用于牙髓血运重建术治疗年轻感染恒牙的临床疗效。方法选取因根尖周病变而引发年轻恒牙感染的患者40例,分为观察组与对照组。观察组应用 MTA 于牙髓血运重建术,对照组应用氢化钙(CH)糊剂于牙髓血运重建术,对比两组患者临床疗效、牙根管壁厚度及冠根比。结果观察组患牙治疗总有效率为90.00%,对照组总有效率为60.00%,观察组总有效率高于对照组(P <0.05);治疗后,两组患者患牙根管壁厚度均比同组治疗前增加,观察组患者根管壁厚度增加较对照组增加更显著;治疗后,两组患者患牙冠根比均有变化,但观察组较对照组变化更小,差异有统计学意义。结论MTA 用于牙髓血运重建术治疗年轻恒牙牙髓感染能够促进牙根继续发育,值得临床推广。%Objective To discuss inorganic mineral trioxide aggregate (MTA)applied to pulp revascularization Immature per-manent teeth infections.Methods Patients with apical lesions caused by infection in forty young permanent teeth were divided into ob-servation group and control group,the observation group used by the MTA to achieve pulp revascularization,while control group used by calcium hydroxide paste.clinical efficacy,crown root ratio and root wall thickness were analyzed.Results The total effective rate was 90.00% in the observation group,while 60.00% (P <0.05).After treatment,two groups of patients from root canal wall thick-ness increased than that before treatment in the same group,and the root canal wall thickness increased more significantly in the obser-vation group than that in the control group.Crown root ratio of two groups has increased,but that in the control group added greater than that in the observation group.Conclusion MTA for pulp revascularization in the treatment of young permanent teeth endodontic infections is worthy to promote.

  13. 年轻恒牙感染根管牙髓血管再生治疗的临床效果观察%Observation on the clinical effect of root canal pulp blood vessel regeneration in the treatment of patients with infected young permanent teeth

    Institute of Scientific and Technical Information of China (English)

    张谦明

    2016-01-01

    目的:探讨年轻恒牙感染根管牙髓血管再生治疗的临床效果。方法:收治进行年轻恒牙感染根管牙髓血管再生治疗患者78例,随机分为两组。对照组采用传统根尖诱导形成术治疗,观察组采用血管再生术治疗。对比两组的临床治疗效果及术后疼痛表现。结果:观察组治疗有效率92.31%,高于对照组的79.49%;观察组轻度疼痛比例高于对照组,且重度疼痛比例低于对照组,差异有统计学意义(P<0.05)。结论:根管牙髓血管再生在年轻恒牙感染治疗中的应用效果显著。%Objective:To investigate the clinical effect of root canal pulp blood vessel regeneration in the treatment of patients with infected young permanent teeth.Methods:78 patients with infected young permanent teeth treated by root canal pulp blood vessel regeneration were selected.They were randomly divided into the two groups.Patients in the control group were treated with traditional root tip induction therapy,and patients in the observation group were treated with vascular regeneration.The clinical therapeutic effect and postoperative pain of the two groups were compared.Results:The effective rate in the observation group of 92.31%was higher than that in the control group of 79.49%.The proportion of patients with mild pain in the observation group was higher than that in the control group,and the proportion of severe pain was lower than that of the control group.The differences between groups were significant(P<0.05).Conclusion:The application effect of root canal pulp vascular regeneration in the treatment of young and constant pressure is obvious.

  14. The clinical effect of MTA in root tip reverse filling treatment for external apical root resorption of permanent anterior teeth%MTA用于根尖倒充填治疗恒前牙根尖外吸收的临床疗效观察

    Institute of Scientific and Technical Information of China (English)

    马列娜; 杨丽

    2016-01-01

    Objective:To explore the clinical effect of MTA in root tip reverse filling treatment for external apical root resorption of permanent anterior teeth.Methods:78 patients with periapical disease were selected.They were randomly divided into the experimental group and the control group with 39 cases in each.The experimental group was treated by MTA in root tip reverse filling.The control group was treated with silver mercury.We compared the treatment effect of two groups.Results:In the experimental group,the apical closure and repair of lesions were significantly better than the control group(P<0.05).The treatment effective rate of the experimental group of 97.4% was significantly higher than 89.7% of the control group(P<0.05).Conclusion:The clinical effect of MTA in root tip reverse filling treatment for external apical root resorption of permanent anterior teeth was significant.%目的:探讨矿物三氧化物凝聚体(MTA)用于根尖倒充填治疗恒前牙根尖外吸收的临床效果。方法:收治根尖周病患者78例,随机分为试验组和对照组各39例,试验组行MTA术进行根尖倒充填,对照组给予银汞合金治疗,比较两组的治疗效果。结果:试验组根尖封闭状况及病损区修复情况明显优于对照组(P<0.05)。试验组治疗有效率97.4%,明显高于对照组的89.7%(P<0.05)。结论:MTA用于根尖倒充填治疗恒前牙根尖外吸收的临床疗效显著。

  15. Frequency of intrusive luxation in deciduous teeth and its effects.

    Science.gov (United States)

    Carvalho, Vivian; Jacomo, Diana Ribeiro; Campos, Vera

    2010-08-01

    The aims of this study were three-fold: First, to determine the prevalence of partial and total intrusion of the primary anterior teeth. Second, to investigate the sequelae of total and partial intrusive luxation in the primary anterior teeth and in their successors and finally, to establish whether the sequelae on both deciduous and permanent teeth were related to the child's age at the time of the intrusion. Data collected from records of 169 boys and 138 girls, all between the ages of zero and 10 years, who were undergoing treatment during the period of March 1996 to December 2004. The sample was composed of 753 traumatized deciduous teeth, of which 221 presented intrusive luxation injury. Children with ages ranging from one to 4 years were the most affected with falls being the main cause of intrusion. Of all intruded teeth 128 (57.9%) were totally intruded and 93 (42.1%) partially. Pulp necrosis/premature loss and color change were the most frequent sequelae in both total and partial intrusions. Concerning permanent dentition, the most common disturbances were color change and/or enamel hypoplasia. Both types of intrusion caused eruption disturbance. Total intrusion was the most frequent type of intrusive luxation. There was no significant correlation between the child's age at the time of intrusion and the frequency of subsequent sequela on primary injured teeth (P = 0.035), between the age at the time of injury and the developmental disturbances on permanent teeth (P = 0.140).

  16. Periodontal healing complications following concussion and subluxation injuries in the permanent dentition: a longitudinal cohort study

    DEFF Research Database (Denmark)

    Hermann, Nuno Vibe; Lauridsen, Eva; Ahrensburg, Søren Steno

    2012-01-01

    Purpose The purpose of the study was to analyze the risk of periodontal ligament (PDL) healing complications following concussion and subluxation injuries in the permanent dentition. Material and method A total 469 permanent teeth (358 patients) with concussion and 404 permanent teeth......-related resorption (ankylosis), marginal bone loss, and tooth loss were analyzed with the Kaplan–Meier method. Results Concussion: In teeth with immature root development, no healing complications were observed. For teeth with mature root development, the risk of repair related resorption after 3 years was 3.2% (95...... among teeth with concussion. Subluxation: In teeth with immature root development, the risk of infection-related resorption after 3 years was 1.7% [95% confidence interval (CI): 0–3.8%]. Infection-related resorption occurred significantly more often in teeth with concomitant crown fracture (P = 0...

  17. In vitro evaluation of marginal microleakage in class V restorations with composite resin in bovine teeth. Laser irradiation influences and the adhesive system in the dentin pre-treatment; Avaliacao in vitro da microinfiltracao marginal em restauracoes de classe V com resina composta em dentes bovinos. Influencia da irradiacao laser e sistema adesivo no pre-tratamento dentinario

    Energy Technology Data Exchange (ETDEWEB)

    Carvalho, Wendell Lima de

    2003-07-01

    Microleakage is one of the most important reasons to restorations failure, it is the responsible for marginal colors changing, new caries, hipersensibility and pulpar diseases. Several techniques and materials have been studied to eliminate or, at least, to decrease microleakage. The cavities preparation with Er:YAG laser and autoconditioning adhesive are some of these techniques and materials. This research has the objective to compare, in vitro, microleakage in class V cavities, prepared with high rotation (conventional treatment), Er:YAG laser (Enamel-400 mj/2 Hz/128,38 J/Cm{sup 2}, Dentin 250 mJ/ 2 Hz/ 80,24 J/Cm{sup 2}) and the treatment made at dentin with autoconditioning adhesive (Clerafil SE Bond) using Er:YAG laser (with water or not water) or not using Er:YAG laser. It was used 48 bovines teeth with cavities prepared in vestibular face and gingival wall on cement enamel junction and oclusal wall on enamel. The materials used were autoconditioning adhesive (Clerafil SE Bond) and composite resin Z250. Teeth were divided into four groups of twelve samples each one, according to dentin treatment. Group 1 - Conventional cavity and autoconditioning adhesive. Group 2- Cavity prepared with Er: YAG laser and autoconditioning adhesive. Group 3 - Cavity prepared with Er:YAG laser and dentin conditioning with Er:YAG laser associated to water and autoconditioning adhesive. Group 4 - Cavity prepared with Er:YAG laser and dentin conditioning with Er: YAG laser without water and associated to autoconditioning adhesive. Teeth were restored and stocked at 37 deg C, thermocycled and placed into a 50% silver nitrate solution. Right after, teeth were sliced and evaluated on a stereo microscopic magnifying glass in order to see microleakage degree trying to follow a score from 0 to 3. The findings were submitted to Fisher, Anderson-Darling tests and to the not parametric Sen and Puri test. The results indicated that in gingival edge, the Group 2 showed less microleakage than

  18. Mesiodistal crown diameters of permanent dentition in schoolchildren from Lima

    OpenAIRE

    Pineda-Mejia, Martha; Departamento Académico de Estomatología Rehabilitadora, Facultad Odontología de la Universidad Nacional Mayor de San Marco, Perú.; Petkova- Gueorguieva, Marieta; Facultad Odontología de la Universidad Nacional Mayor de San Marcos.

    2015-01-01

    The purpose of this study was to determine the size of mesiodistal diameters of permanent teeth in a school population of the city of Lima, to analyze the differences between homologous teeth, sexual dimorphism of permanent teeth as well as the degree of variability of the measurements. Methodology: The study was conducted on 400 students of mestizos (200 men and 200 women) 10 to 12 years, from three schools in the districts of la Victoria and Barrios Altos, Lima city. The procedure was perfo...

  19. Pulpectomy procedures in primary molar teeth

    Directory of Open Access Journals (Sweden)

    Hany Mohamed Aly Ahmed

    2014-01-01

    Full Text Available Premature loss of primary molars can cause a number of undesirable consequences including loss of arch length, insufficient space for erupting premolars and mesial tipping of the permanent molars. Pulpectomy of primary molar teeth is considered as a reasonable treatment approach to ensure either normal shedding or a long-term survival in instances of retention. Despite being a more conservative treatment option than extraction, efficient pulpectomy of bizarre and tortuous root canals encased in roots programmed for physiologic resorption that show close proximity to developing permanent tooth buds presents a critical endodontic challenge. This article aims to provide an overview of this treatment approach, including partial and total pulpectomy, in primary molar teeth. In addition, the recommended guidelines that should be followed, and the current updates that have been developed, while commencing total pulpectomy in primary molars are discussed.

  20. A Case Report of Dilacerated Crown of a Permanent Mandibular Central Incisor

    OpenAIRE

    Bolhari, Behnam; Pirmoazen, Salma; Taftian, Ensieh; Dehghan, Somayeh

    2016-01-01

    Trauma to primary teeth can lead to devastating sequels in development of permanent successors. The disturbance may range from enamel hypoplasia and/or hypo-calcification to arrest of dental bud development. Crown dilaceration of permanent teeth is one of the consequences of trauma to deciduous teeth mainly due to intrusion or avulsion. This report presents a mandibular central incisor with dilacerated crown and yellowish discoloration with symptomatic apical abscess. History revealed avulsio...

  1. A Case Report of Dilacerated Crown of a Permanent Mandibular Central Incisor

    OpenAIRE

    Behnam Bolhari; Salma Pirmoazen; Ensieh Taftian; Somayeh Dehghan

    2017-01-01

    Trauma to primary teeth can lead to devastating sequels in development of permanent successors. The disturbance may range from enamel hypoplasia and/or hypo-calcification to arrest of dental bud development. Crown dilaceration of permanent teeth is one of the consequences of trauma to deciduous teeth mainly due to intrusion or avulsion. This report presents a mandibular central incisor with dilacerated crown and yellowish discoloration with symptomatic apical abscess. History revealed avulsio...

  2. Replacement of hopeless retained primary teeth by immediate dental implants: a case report.

    Science.gov (United States)

    de Oliveira, Rafael R; Macedo, Guilherme O; Muglia, Valdir A; Souza, Sérgio L S; Novaes, Arthur B; Taba, Mário

    2009-01-01

    Hopeless retained primary teeth without permanent successors represent a restorative challenge for clinicians, along with esthetic and functional problems for patients. While various treatment approaches for congenitally missing teeth have been proposed, the replacement of a missing tooth with a dental implant offers specific advantages, such as preservation of the alveolar crest and elimination of the need to restore the adjacent teeth, over other options for tooth replacement. The aim of this article was to illustrate the surgical and prosthetic treatment with implants of a patient with primary teeth without permanent successors.

  3. Iatrogenic mid-root perforation of fused teeth

    Directory of Open Access Journals (Sweden)

    Vijay Kumar

    2012-01-01

    Full Text Available Fusion is defined as a union between the dentin and/or enamel of two or more distinct dental sprouts that occurs at any stage of the dental organ. Its prevalence ranges from 0.5%-2.5% in the primary dentition alone and 0.1%-1% of the primary as well as the permanent dentition. These fused teeth can cause various problems such as caries, periodontal disease, abnormal eruption, impaction or an ectopic eruption of an adjacent tooth and reported in the literature. However this paper documented an unusual case of iatrogenic root perforation of fused permanent lower anterior teeth during inter maxillary fixation.

  4. Treatment of avulsed teeth with Emdogain--a case report.

    Science.gov (United States)

    Caglar, Esber; Tanboga, Ilknur; Süsal, Seckin

    2005-02-01

    The present case report describes the reimplantation of avulsed teeth with the treatment of Emdogain. Case was avulsed right maxillary permanent central and lateral incisor in a 9-year-old girl suffering from a traumatic injury. After pretreatment of avulsed teeth, Emdogain was applied to the root surface and into the extraction socket with subsequent replantation of the tooth. Evaluation parameters included horizontal and vertical percussion sound and periapical radiographs. At 1-2-6-12-month follow-up period, the clinical and radiographic appearance of the teeth showed resolution of mobility and no signs of replacement resorbption.

  5. Severe root resorption associated with ectopically erupting teeth: a case report.

    Science.gov (United States)

    Kakuta, Hatsue; Sone, Shinya; Matsumoto, Hiroki; Tanaka, Mitsuro

    2010-01-01

    A 12-year-old Japanese boy had ectopic eruption of the permanent maxillary canines and permanent mandibular second molars accompanied by root resorption of the adjacent permanent teeth. The permanent maxillary lateral incisors were extracted, and fenestration traction treatment was performed for the ectopically erupting canines. They were moved to the occlusal position orthodontically using a lingual arch appliance and sectional arch wire. The mandibular second molars were moved distally with an appliance designed to minimize the load on the teeth. The treatment is discussed with consideration of the diagnosis and appliances.

  6. Sequential supernumerary teeth development in a non-syndromic patient; report of a rare case.

    Directory of Open Access Journals (Sweden)

    Mohammad Jafarian

    2013-12-01

    Full Text Available Isolated impacted supernumerary teeth are quite rare, but they can be seen associated with several syndromes such as cleidocranial dysostosis or Gardner's syndrome. This article aims to discuss a case of sequential formation of supernumerary teeth with no other associated disease or syndrome. A 17-year-old Iranian male with 8 impacted supernumerary teeth was referred to the department of pediatric dental clinic at Shahid Beheshti Medical University in Tehran with a history of several impacted unerupted teeth. Repeated and periodical clinical and radiographic examinations revealed newly formed teeth buds in unusual dental ages. All extra teeth were associated with generalized enamel hypoplasia to some degree on their relative permanent adjacent teeth. The patient did not have any record of a systemic disease or any syndromic condition to relate his dental problem to. This rare condition involved repeated and continued formation of extra teeth out of the normal numbers and dental age evident in serial radiographs.

  7. Analysis on the relationship between gingivitis and permanent teeth caries among 12~13 year-old children in Guangzhou.%广州市12~13岁儿童牙龈炎与恒牙龋患病关系的调查分析

    Institute of Scientific and Technical Information of China (English)

    王冬梅; 王萍; 梁焕友; 吴坚

    2011-01-01

    [Objective] To investigate the relationship between gingivitis and permanent teeth caries of children to provide theoretical basis for gingivitis prevention of children. [ Methods] Multistage stratified cluster random sampling method was used to obtain 1115 samples among 12~13 year-old children in Guangzhou. The methods and criteria of gingivitis and caries were abided by World Health Organization in 1997. The examination indices of gingivitis and caries were scored with GI and DMFT, respectively. Logistic regression analysis was used to explore the relation between gingivitis and permanent teeth caries in 12~13 year-old children in Guangzhou. [ Results] In the cohort aged 12~ 13, the prevalence of gingivitis was 72.65%. The prevalence of moderate and severe gingivitis was 28. 16% and 5.83%, respectively. The prevalence of caries of the subjects was 25.83%, the non-filled tooth accounted for 73. 73% among DMFT. The result of Logistic regression analysis showed non-filled caries was a risk factor of gingivitis in 12~13 year-old children in Guangzhou. [Conclusion] The children who had non-filled caries are focus on prevention of gingivitis in Guangzhou.%[目的]探讨儿童牙龈炎与恒牙龋的相关关系,为儿童牙龈炎防治工作提供理论依据.[方法]采用多阶段分层整群随机抽样的方法共调查广州市12~13岁儿童1115人.检查方法和标准参考1997年WHO推荐的,牙龈炎检查六颗指数牙,龋病检查全口恒牙,分别采用牙龈指数(GI)和DMFT记录检查结果.Logistic 回归分析儿童牙龈炎与恒牙龋病的关系.[结果]广州市12~13岁儿童牙龈炎患病率 72.65%,中、重度牙龈炎患病率分别为28.16%和5.83%.恒牙龋患病率为25.83%,其中未充填龋占龋齿的73.73 %.Logistic回归分析显示未充填龋是广州市12~13岁儿童牙龈炎患病的危险因素.[结论]广州市12~13岁儿童牙龈炎患病率较高,有未充填龋存在的儿童是广州市儿童牙龈炎重点防治人群.

  8. Caries status of primary and permanent teeth among 6-year-old children in Sichuan Province and their correlation%四川省6岁儿童乳恒牙患龋状况及相关性研究

    Institute of Scientific and Technical Information of China (English)

    刘建忠; 李雪; 胡德渝; 张曦木; 何松霖

    2012-01-01

    Objective To investigate caries status of primary and permanent teeth among 6-year-old children in Sichuan Province and correlation between caries of deciduous molars and first permanent molars. Methods Referenced to the sampling programme of the third national epidemiological survey of oral health status, a total of 714 children aged 6 were randomly sampled in clusters including 3 urban sampling spots and 3 rural sampling spots, the correlation between caries of deciduous molars and first permanent molars was explored. Results The prevalence rate of deciduous tooth caries of 6-year-old children in Sichuan province was 74.37%, the mean number of dmft of 6-year-old was 3.94± 3.93, the filling rate was only 4.96%. The prevalence rate and mean dmft of deciduous tooth caries showed no significant difference between different area and gender (P>0.05), however, the children came from city showed significant higher filling rate than those from countryside (P<0.05). The first permanent molars erupted have -2.98% in caries, the filling rate was 7.69%. Caries of deciduous molars was the first permanent molars caries risk factors among 6-year-old children in Sichuan province[P=0.001, r=0.175, OR=5.756, 95%CI(1.733, 19.121)]. There was weak correlation between caries of deciduous molars and first permanent molars (P<0.001, r=0.194). Conclusion Caries status of primary among 6-year-old children in Sichuan Province are serious. Caries experience of deciduous molars may play an important role in predicting the first permanent molars caries in clinic and prevention.%目的 了解四川省6岁儿童患龋情况,探讨乳磨牙患龋与第一恒磨牙患龋之间的相关性.方法 参照第三次全国口腔健康流行病学抽样调查方案,在四川省3个城市、3个农村随机抽样选取调查点,共调查714名6岁儿童的患龋情况,并分析乳磨牙患龋情况与第一恒磨牙患龋情况之间的相关性.结果 四川省6岁儿童乳牙患龋率为74.37

  9. Long-term evaluation of extensive restorations in permanent teeth

    DEFF Research Database (Denmark)

    Nieuwenhuysen, J.-P. van; D'hoore, W.D.; Carvalho, J.;

    2003-01-01

    Biostatistics, cast crowns, complex restorations, composite resins, decision making, dental amalgam, metal ceramic crowns, multi-surfaced restorations, prosthodontics, restorative dentistry......Biostatistics, cast crowns, complex restorations, composite resins, decision making, dental amalgam, metal ceramic crowns, multi-surfaced restorations, prosthodontics, restorative dentistry...

  10. Molecular Analysis of the Caries Biofilm in Young Permanent Teeth

    Science.gov (United States)

    2006-01-01

    sterile dental instrument and whipped onto a sterile, extra coarse endodontic paper point or placed directly in sterile 1.5-mL microfuge tubes and...report of the Surgeon General. 2000. Journal California Dental Association. 28:685-695. 2. Newacheck, P., Hughes, D., Hung, V., Wong, S., and Stoddard, J...Institutes of Health Consensus Development Conference Statement. 2001. Journal of Dental Education. 65:1162-1168. 4. Burt, B. and Ismail, A. 1986. Diet

  11. Histological Evaluation and Management of Rare Case of Supernumerary “Ghost” Teeth

    Directory of Open Access Journals (Sweden)

    Dino Re

    2017-01-01

    Full Text Available Supernumerary teeth are teeth that exceed the normal dental formula. Their prevalence in the permanent dentition is 1–14% and they occur more frequently in maxilla with a sex ratio of 2 : 1 in favor of males. They are often associated with syndromes but there are examples of nonsyndromic multiple supernumerary teeth reported in the literature. CBCT is usually the best exam for radiographic diagnosis and treatment planning, because it provides 3D information about location and morphology of supernumerary teeth. This paper reports a rare case of four supernumerary teeth in a nonsyndromic 9-year-old boy. The peculiarity of this case is that two more exceeding teeth were found during surgical procedure. After extraction, all the teeth underwent a histological undecalcified processing for light microscopical examination. The two “ghost” supernumerary teeth seemed to be primordial dental germs, possibly resulting from an altered odontogenic process. After supernumerary teeth extraction, X-rays and exfoliation monitoring are recommended, since permanent retained teeth often erupt naturally or, at least, improve their condition. Radiographic follow-up is also useful in order to assess the formation of further teeth due to the hyperactivity of the dental lamina.

  12. Essure Permanent Birth Control

    Science.gov (United States)

    ... Prosthetics Essure Permanent Birth Control Essure Permanent Birth Control Share Tweet Linkedin Pin it More sharing options ... System Essure is a a permanently implanted birth control device for women (female sterilization). Implantation of Essure ...

  13. Microstructure and hardness of bovine enamel in roselle extract solution

    Science.gov (United States)

    Dame, M. T.; Noerdin, A.; Indrani, D. J.

    2017-08-01

    The aim of this study was to analyze the effect of roselle extract solution on the microstructure and hardness of bovine enamel. Ten bovine teeth and a 5% concentration of roselle extract solution were prepared. Immersions of each bovine tooth in roselle extract solution were conducted up to 60 minutes. The bovine enamel surface was characterized in hardness and microscopy. It was apparent that the initial hardness was 328 KHN, and after immersion in 15 and 60 min, the values decrease to 57.4 KHN and 11 KHN, respectively. Scanning electron microscopy (SEM) revealed changes in enamel rods after immersion in the roselle extract solution.

  14. Malocclusion of teeth

    Science.gov (United States)

    ... clean and decrease risk of tooth decay and periodontal diseases ( gingivitis or periodontitis ). Eliminate strain on the teeth, ... JA, ed. McDonald and Avery's Dentistry for the Child and Adolescent . 10th ed. St. Louis, MO: Elsevier; 2016:chap ...

  15. Múltiples dientes supernumerarios distomolares Multiple distomolars supernumerary teeth

    Directory of Open Access Journals (Sweden)

    F.J. Rodríguez Romero

    2009-12-01

    Full Text Available En una dentición normal, los dientes supernumerarios son aquellos descritos como adicionales a la serie. La etiología no esta clara. Se han descritos tanto en dentición primaria como en permanente, aunque son mas frecuentes en la dentición permanente. El objetivo de este informe es presentar un caso de una paciente con múltiples dientes supernumerarios distomolares. Cuartos molares bilaterales simétricos son sumamente raros.Supernumerary teeth are described as the teeth formed in excess of the number found in a normal dentition. The aetiology is not clear. Have been reported in both the primary and permanent dentition, although they are more prevalent in the permanent dentition. The purpose of this case report is to present a case of female patient with multiple distomolars supernumerary teeth. Bilateral symmetrical impacted fourth molars exceedingly uncommon.

  16. Impaction of First Permanent Molars-Case Report.

    Science.gov (United States)

    1982-06-10

    t hwt Iafi ri, t-~ ~ d f .( r 1, , ’ i t d I~’ ’ b ut i. i1 DIS’Rg.,&’ ION IA7E.MENT W.t~ n’e 18. SUPPLEMENTARY NOTES ~ 19. KEY WORDS (Continue on...permanent teeth and related clinical cases. Oral Surg, 1982 (In press). 2. Meade, Sterling V. Incidence of impacted teeth. Int J Orthod 16:885, 1930. 3

  17. Do the levels of selected metals differ significantly between the roots of carious and non-carious teeth?

    Energy Technology Data Exchange (ETDEWEB)

    Malara, Piotr [Silesian Medical University, Department of Maxillofacial Surgery 20/24 Francuska Street, 40-027 Katowice (Poland)]. E-mail: malara@netinfo.pl; Kwapulinski, Jerzy [Silesian Medical University, Department of Toxicology 4 Jagiellonska Street, 41-200 Sosnowiec (Poland); Malara, Beata [Silesian Medical University, Department of Environmental Medicine and Epidemiology 19 Jordana Street, 41-808 Zabrze (Poland)

    2006-10-01

    Since the metals deposited in teeth during formation and mineralization processes are to a large extent retained, human teeth receive a considerable attention as the indicators of the heavy metal exposure. The use of permanent teeth is limited because the extraction of healthy permanent teeth just for this purpose is hardly acceptable. As the issue of the loss of elements from a carious lesion in the coronal part of a tooth remains controversial, the valuable material could only be the root of carious and fractured permanent teeth. However, to ensure the validity of the results, it should be ascertained that the levels of certain toxic and essential elements do not differ significantly between the roots of non-carious and carious teeth, and therefore this is the aim of this project. The levels of cadmium, chromium, copper, iron, manganese, lead, zinc, potassium, sodium, calcium and magnesium were determined in the roots of 344 permanent teeth (189 carious and 155 caries-free teeth) from the residents of Ruda Slaska, Poland, aged 18 to 34. No statistically significant difference between the concentration of these metals in the roots of non-carious and carious teeth was found. This finding applies to both the general population and after the grouping by donor's gender and tooth type. The concentration of lead, iron, calcium and manganese in the roots of non-carious and carious teeth exhibited dependence upon tooth type, as well as the concentration of potassium in the roots of carious teeth. Since the mineral composition of the roots of permanent teeth is similar for the non-carious, as well as the carious teeth, they can be indiscriminately selected for the tests required by a research project, as they will produce the comparable results. However, in the case of lead, iron, calcium, potassium and manganese, the comparison should be made after grouping by tooth type.

  18. Premature exfoliation of teeth in childhood and adolescence.

    Science.gov (United States)

    Hartsfield, J K

    1994-01-01

    Although the premature loss of primary teeth in conjunction with early eruption may be of no clinical significance, the loss of primary or permanent teeth in the absence of trauma should not be overlooked by the clinician. Premature loss of teeth associated with systemic disease usually results from some change in the immune system or connective tissue. This chapter presented some conditions associated with loosening and/or premature loss of teeth that may be encountered in children and adolescents. The most common of these conditions appear to be hypophosphatasia and early-onset periodontitis. Other less common conditions were described to aid in forming a differential diagnosis. Other diseases that may manifest with severe oral infection, such as Wiskott-Aldrich syndrome, diabetes mellitus, or herpes zoster, could result in early tooth loss.

  19. Overjet and overbite analysis during the eruption of the upper permanent incisors.

    Science.gov (United States)

    Cuoghi, Osmar A; Sella, Rodrigo C; Mamede, Igo; de Macedo, Fernanda A; Miranda-Zamalloa, Yésselin M; de Mendonça, Marcos R

    2009-01-01

    ABSTRACT The purpose of this study was to analyze the overjet and overbite behavior during eruption of the upper permanent incisors. Fourth-eight plaster casts of 16 patients from ages 6-13 years were appraised longitudinally. It was found that the overjet remains constant, starting at the eruption of the upper permanent central incisors until eruption of the upper permanent canine teeth, while the overbite increases after eruption of the upper permanent lateral incisors and remains constant with the eruption of the canine teeth.

  20. Prevalence of impacted and supernumerary teeth in the North Indian population.

    Science.gov (United States)

    Patil, Santosh; Maheshwari, Sneha

    2014-04-01

    Dental impaction is a very frequent problem. Supernumerary teeth, or hyperdontia, are the presence of additional teeth to the normal series in the either of the dentition. The presence of impacted and/or supernumerary teeth can cause various complications. The objective of the present study was to determine the prevalence of impacted and supernumerary teeth in the North Indian population. The panoramic radiographic records of 4750 patients attending the Department of Oral Medicine and Radiology, Jodhpur Dental College General Hospital between September 2008 to December 2012 were examined for this retrospective study. The ages of the patients ranged from 8 to 72 years, with a mean of 34.6 years. A total of 798 (16.8%) patients presented with 1126 impacted teeth. Impacted canines were the most prevalent (9.7%), followed by impacted premolars (4.3%). Supernumerary teeth (1.6%) and impacted molars (1.2%) were less prevalent. Among the 842 impacted teeth, the most frequently affected teeth were the canines (56.7%), followed by premolars (27.8%), and supernumerary teeth (9.3%), while the prevalence of impacted molars was quite lower (6.2%). The most frequently impacted teeth were maxillary canines and the mesiodens were the most common supernumerary tooth. The early diagnosis of supernumerary and impacted teeth is essential to prevent malocclusion and malalignment of permanent teeth demonstrating the importance of panoramic radiographs in their detection. Key words:Impacted, supernumerary, prevalence, canines, mesiodens.

  1. [Diagnosis and treatment of supernumerary teeth in the premaxillary region: a literature review].

    Science.gov (United States)

    Ratson, T

    2013-01-01

    Supernumerary teeth are more frequently located in the premaxillary region. Mesiodentes are the most common supernumerary teeth, occurring in 0.15% to 1.9% of the population. Supernumerary teeth are frequently diagnosed in a random radiograph, or after clinical symptoms appear. The majority of the complications consist of delayed or ectopic eruption of the permanent incisors. It is important for the clinician to be aware of the phenomenon and its implications, in order to diagnose it as early as possible. Extraction of the supernumerary teeth in the late mixed dentition, will minimize the chances of damaging the adjacent permanent teeth, but will reduce the possibility of spontaneous eruption of an impacted permanent incisor. Extraction in the early mixed dentition can expedite the eruption of the permanent incisor, although it may involve sedation or general anesthesia, due to lack of cooperation in the young patient. Because to the risk of uneruption of the permanent impacted incisor, exposure of the teeth and bonding a ligature or bracket at the same procedure, and providing a possibility for the dentist to make the incisor erupt after the first operation, should the incisor not erupt spontaneously. Treating these cases require the cooperation of pediatric dentist, orthodontic and dental surgeon, and sometimes the involvement of an anesthesiologist.

  2. The post-mortem pink teeth phenomenon: a case report.

    Science.gov (United States)

    Soriano, Evelyne-Pessoa; Carvalho, Marcus-Vitor-Diniz de; Santos, Francisco-Bernardo Dos; Mendoza, Clóvis-César de; Araújo, Maria-do Socorro-Dantas de; Campello, Reginaldo-Inojosa-Carneiro

    2009-07-01

    This study presents the case of the post-mortem pink teeth phenomenon observed during an autopsy procedure performed on the body of a man who was kidnapped and murdered approximately 30 days before the examination. The corpse was in an advanced stage of decomposition and putrefaction. Both maxillary and jaw bones were intact, as well as the permanent teeth which presented the "pink teeth phenomenon", probably due to a haemorrhage in the pulp chambers. The pink discolouration was most pronounced at the neck of the teeth. The cause of death was asphyxia. Although the examiners stressed that post-mortem pink teeth must not be considered as a reliable odontological parameter for determining the cause of death, the results of other studies have shown that the pink teeth phenomenon is a common finding related to cases of asphyxia such as strangulation, drowning or suffocation. Thus, the pink teeth phenomenon must be studied in order to determine its role as a post-mortem finding. As of now, an exact relationship between the cause of death and this phenomenon remains unknown.

  3. Estimating Gear Teeth Stiffness

    DEFF Research Database (Denmark)

    Pedersen, Niels Leergaard

    2013-01-01

    The estimation of gear stiffness is important for determining the load distribution between the gear teeth when two sets of teeth are in contact. Two factors have a major influence on the stiffness; firstly the boundary condition through the gear rim size included in the stiffness calculation...... and secondly the size of the contact. In the FE calculation the true gear tooth root profile is applied. The meshing stiffness’s of gears are highly non-linear, it is however found that the stiffness of an individual tooth can be expressed in a linear form assuming that the contact length is constant....

  4. Bovine dental fluorosis: histologic and physical characteristics

    Energy Technology Data Exchange (ETDEWEB)

    Shearer, T.R.; Kolstad, D.L.; Suttie, J.W.

    1978-04-01

    Incisor teeth from 5- to 6-year-old Holstein-Friesian cattle maintained on a ration averaging 40 ppm F annually from 4 months of age were analyzed by a variety of histologic techniques. These techniques included photomicroscopy, microradiography, protein staining, and microhardness testing. The features of fluorotic enamel that were noted were: hypomineralized outer enamel, coronal cementum hyperplasia, disrupted subsurface pigment band, hypoplastic pits, puckered incremental lines, periodic radiolucent regions, positive protein staining, and decreased microhardness of the outer enamel. These results were similar to the lesions of dental fluorosis observed in other species, and explain the external appearance of fluorotic bovine teeth observed under field conditions.

  5. The orthodontic extraction of permanent molars: a literature review.

    Science.gov (United States)

    Chua, Emilia S L; Felicita, A Sumathi

    2015-05-01

    The most common cause of dental crowding is the presence of an arch-length--tooth-size discrepancy. Conventional methods of gaining space in orthodontics involve the extraction of teeth, often premolars. However, there are a number of clinical situations in which the extraction of permanent molars might be considered. This paper highlights the indications, advantages, disadvantages and timing of the extraction of the first, second and third permanent molars in the treatment of a crowded malocclusion.

  6. A facial talon cusp on maxillary permanent central incisors

    Directory of Open Access Journals (Sweden)

    Suneelkumar Chinni

    2012-01-01

    Full Text Available Talon cusp is a dental anomaly that occurs as an accessory cusp like structure, from the cingulum of maxillary and mandibular anterior teeth. Lingual location is usually considered pathognomic. This case report discuss about the unusual appearance of talon cusp on the facial surface of the maxillary left permanent central incisor and a mild talon cusp on the facial surface of the maxillary right permanent central incisor.

  7. Multiple supernumerary teeth associated with an impacted maxillary central incisor: Surgical and orthodontic management

    Directory of Open Access Journals (Sweden)

    Ramakrishna Yeluri

    2012-01-01

    Full Text Available Various anomalies in the size, shape, number, structure and eruption of the teeth are often observed clinical conditions. Supernumerary teeth can be found in almost any region of the dental arch, and most of the times they are asymptomatic, and are routinely found during radiographic evaluation. The most common cause of impacted maxillary incisors is the presence of the supernumerary teeth. This paper describes a case of multiple supernumerary teeth associated with an impacted permanent maxillary central incisor in an 11-year old child along with its surgical and orthodontic management.

  8. Forensic study of sex determination using PCR on teeth samples.

    Directory of Open Access Journals (Sweden)

    Murakami H

    2000-02-01

    Full Text Available In this study, sex determination using polymerase chain reaction (PCR on tooth material was evaluated from the viewpoint of forensic medicine. The sensitivity of PCR for detection of the Y chromosome-specific alphoid repeat sequence and the X chromosome-specific alphoid repeat sequence was 0.5 pg of genomic DNA. Sex could be determined by PCR of DNA extracted from the pulp of 16 freshly extracted permanent teeth and dentine including the surface of the pulp cavity of 6 freshly extracted milk teeth. Sex could be determined using the pulp in all 20 teeth (10 male and 10 female preserved at room temperature for 22 years. For the pulp of teeth stored in sea water, the sex could be determined in all 8 teeth immersed for 1 week and in 5 of 6 teeth immersed for 4 weeks. In the remaining 1 tooth, in which sex determination based on the pulp failed, the sex could be determined correctly when DNA extracted from the tooth hard tissue was examined. For teeth stored in soil, the sex could be determined accurately in all 8 teeth buried for 1 week, 7 of 8 teeth buried for 4 weeks, and in all 6 teeth buried for 8 weeks. When teeth were heated for 30 min, sex determination from the pulp was possible in all teeth heated to 100, 150, and 200 degrees C, and even in some teeth heated to 250 degrees C. When this method was applied to actual forensic cases, the sex of a mummified body estimated to have been discovered half a year to 1 year after death could be determined readily by examination of the dental pulp. In the skeletons of 2 bodies placed under water for approximately 1 year and approximately 11 years and 7 months, pulp tissues had been dissolved and lost, but sex determination was possible using DNA extracted from hard dental tissues. These results indicate that this method is useful in forensic practices for sex determination based on teeth samples.

  9. Mercury Amalgam Diffusion in Human Teeth Probed Using Femtosecond LIBS.

    Science.gov (United States)

    Bello, Liciane Toledo; da Ana, Patricia Aparecida; Santos, Dário; Krug, Francisco José; Zezell, Denise Maria; Vieira, Nilson Dias; Samad, Ricardo Elgul

    2017-01-01

    In this work the diffusion of mercury and other elements from amalgam tooth restorations through the surrounding dental tissue (dentin) was evaluated using femtosecond laser-induced breakdown spectroscopy (fs-LIBS). To achieve this, seven deciduous and eight permanent extracted human molar teeth with occlusal amalgam restorations were half-sectioned and analyzed using pulses from a femtosecond laser. The measurements were performed from the amalgam restoration along the amalgam/dentin interface to the apical direction. It was possible to observe the presence of metallic elements (silver, mercury, copper and tin) emission lines, as well as dental constituent ones, providing fingerprints of each material and comparable data for checking the consistence of the results. It was also shown that the elements penetration depth values in each tooth are usually similar and consistent, for both deciduous and permanent teeth, indicating that all the metals diffuse into the dentin by the same mechanism. We propose that this diffusion mechanism is mainly through liquid dragging inside the dentin tubules. The mercury diffused further in permanent teeth than in deciduous teeth, probably due to the longer diffusion times due to the age of the restorations. It was possible to conclude that the proposed femtosecond-LIBS system can detect the presence of metals in the dental tissue, among the tooth constituent elements, and map the distribution of endogenous and exogenous chemical elements, with a spatial resolution that can be brought under 100 µm.

  10. Malocclusion (Misaligned Teeth)

    Science.gov (United States)

    ... More Information Medical Dictionary Also of Interest (Quiz) Biology of the Mouth (Video) Root Canal Additional Content Medical News Malocclusion ˌmal-ə-ˈklü-zhən (Misaligned Teeth) By David F. Murchison, DDS, MMS, Clinical Professor, Department of Biological Sciences;Clinical Professor, The University ...

  11. Management of supernumerary teeth

    Directory of Open Access Journals (Sweden)

    Abhishek Parolia

    2011-01-01

    Full Text Available Supernumerary paramolars are the rare anomalies of the maxillofacial complex. These are more common in the maxilla than in the mandible. This article reviews the etiology, frequency, classification, complications, diagnosis and management of supernumerary teeth (bilateral maxillary paramolars

  12. About Kids' Teeth

    Science.gov (United States)

    ... “smile insurance.” Baby Tooth Decay Baby Tooth Decay Is Real As soon as teeth appear in ... of a mouth appliance. Prevent Decay Prevent Kids’ Tooth Decay You can prevent tooth decay for your kids ...

  13. Snow-white teeth

    National Research Council Canada - National Science Library

    Sarll, D

    2006-01-01

    ... well have pointed out, but unavailingly, that snow-white teeth adorn only the grins of infants.There is, however, another ploy that colleagues might try in their quest to enlighten patients, particularly those of a literary disposition: adduce the attributes of 'youthful beauty' given to us by Virginia Woolf (1882 - 1941). From her novel, Orla...

  14. Mouth and Teeth (For Parents)

    Science.gov (United States)

    ... Reading Is Your Child Too Busy? Helping Your Child Adjust to Preschool School Lunches Kids and Food: ... in this article? Basic Anatomy of the Mouth and Teeth Normal Development of the Mouth and Teeth What the Mouth ...

  15. Marxism as permanent revolution

    NARCIS (Netherlands)

    van Ree, E.

    2013-01-01

    This article argues that the 'permanent revolution' represented the dominant element in Karl Marx and Friedrich Engels' political discourse, and that it tended to overrule considerations encapsulated in 'historical materialism'. In Marx and Engels's understanding, permanent revolution did not repres

  16. Marxism as permanent revolution

    NARCIS (Netherlands)

    van Ree, E.

    2013-01-01

    This article argues that the 'permanent revolution' represented the dominant element in Karl Marx and Friedrich Engels' political discourse, and that it tended to overrule considerations encapsulated in 'historical materialism'. In Marx and Engels's understanding, permanent revolution did not

  17. [Infants wearing teething necklaces].

    Science.gov (United States)

    Taillefer, A; Casasoprana, A; Cascarigny, F; Claudet, I

    2012-10-01

    Numerous infants wear teething necklaces, a quack remedy with a real risk of strangulation or aspiration of small beads. Evaluate parental perceptions and beliefs about the use of teething necklaces and analyze parental knowledge about the associated dangers. Between March and July 2011, in three different pediatric units of a tertiary children's hospital and a general hospital in Toulouse and Montauban (southwest France), voluntary parents were invited to be interviewed about their child wearing a teething necklace. The interviews were conducted following an anthropological approach: they were recorded and then fully transcribed and analyzed. Parents were informed that the conversation was recorded. During the study period, 48 children were eligible. Eleven families refused to participate, 29 parents were interviewed face to face. The children's mean age was 14 years ± 7 months, the male:female ratio was equal to 0.8 (12 boys, 15 girls). The mean age of children when necklace wearing was started was equal to 4 ± 2 months. The mean mother's age was 31 ± 5 years and 33 ± 4 years for fathers. The parents' religion was mostly Catholic (60%). Teething necklaces were mainly made of amber (n=23). Sales information about the risks associated with the necklaces was for the most part absent (92%). The most frequent positive parental perceptions were analgesic properties and a soothing remedy (73%); a birth accessory and memory (64%); an esthetic accessory (60%); a protective amulet (60%); and an alternative or additional element to other traditional therapeutics (55%). The negative parental perceptions (n=4) were an unnecessary accessory, costume jewelry, a pure commercial abuse of a popular belief, a dangerous item with a risk of strangulation, and the absence of proof of its efficacy. Although parents concede that teeth eruption is benign, they fear its related symptoms. To a natural phenomenon a natural response: they use a necklace to satisfy the analogy. The

  18. Management of a permanent tooth after trauma to deciduous predecessor: an evaluation by cone-beam computed tomography.

    Science.gov (United States)

    Gurgel, Carla Vecchione; Lourenço Neto, Natalino; Kobayashi, Tatiana Yuriko; Garib, Daniela Gamba; da Silva, Salete Moura Bonifácio; Machado, Maria Aparecida de Andrade Moreira; Oliveira, Thais Marchini

    2011-10-01

    Impaction of permanent teeth represents a clinical challenge with regard to diagnosis, treatment plan, and prognosis. There is a close relationship between deciduous teeth and permanent teeth germ, and any injury in the deciduous dentition may influence the permanent teeth eruption. The extent of the damage caused to the permanent teeth germ depends on the patient age at the time of injury, type of trauma, severity, and direction of the impact. Conventional radiographic images are frequently used for diagnosis; however, recent developments in three-dimensional (3D) imaging systems have enabled dentistry to visualize structural changes effectively, with better contrast and more details, close to the reality. The cone-beam computed tomography (CBCT) has been used in the diagnosis and treatment plan of these impacted teeth. The purpose of the present case report is to describe a successful conservative management of a retained permanent maxillary lateral incisor with delayed root development after a trauma through the deciduous predecessor in a 9 year-old patient. After clinical and radiographic examination, a CBCT examination of the maxilla was requested to complement the diagnosis, providing an accurate 3D position of the retained tooth and its relationship to adjacent structures. The proposed treatment plan was the surgical exposure and orthodontic traction of the retained tooth. The lateral incisor spontaneously erupted after 6 months. Therefore, this case report suggests that permanent teeth with incomplete root formation have a great potential for spontaneous eruption because no tooth malposition or mechanical obstacles are observed.

  19. Teeth Injuries (For Parents)

    Science.gov (United States)

    ... a dentist. Watch for swelling of the gums, pain, fever, or a change in the color of the tooth. If a permanent tooth is chipped or broken: ... to help keep it in place. If the tooth is stored in a container (rather ... and pain. Think Prevention! Make sure kids wear mouthguards and ...

  20. Odontomas--silent tormentors of teeth eruption, shedding and occlusion.

    Science.gov (United States)

    Kulkarni, Vinaya Kumar; Deshmukh, Jeevanand; Banda, Naveen Reddy; Banda, Vanaja Reddy

    2012-12-14

    Odontomas are the most common odontogenic tumours of the jaws, characterised by their slow growth and non-aggressive behaviour. They usually remain asymptomatic, and are diagnosed on routine radiographs. Clinically, they are often associated with delayed eruption or impaction of permanent teeth and retained primary teeth. The purpose of this paper is to review the literature and report two cases of odontomas. In the first case, a compound odontoma was associated with an unerupted maxillary permanent right central incisor, in an 11-year-old boy. In the second case, a 12-year-old girl had retained mandibular primary left central incisor and its unerupted successor was associated with a compound odontoma, a site considered rare for compound odontoma to occur. The clinical features, diagnosis and treatment of these cases have been discussed.

  1. A CASE OF LOWER ANTERIOR PRIMARY TEETH FUSION

    Directory of Open Access Journals (Sweden)

    Noni Nurseni

    2006-04-01

    Full Text Available Dental fusion is the most common problem seen in the primary dentition. The incidence of dental fusion was approximately 0.5% for deciduous dentition and 0.1% for permanent dentition. Fusion may be complete or incomplete. Its etiology was related to genetic or local factor. These anomalies could result in dental caries, esthetic problem, periodontal disease, dental malocclusion, and hypodontia in permanent dentition. Treatment of fused teeth depends on the location and extent of fusion. This report describes an incomplete dental fusion with dentinal caries occurred on 72 and 73 while 32 was agenesis. The purpose of the treatment was to improve the esthetic performance and subsequently to keep the teeth until the exfoliation time. After the restoration of 72 and 73, the patient feels satisfied.

  2. Dentinogenesis imperfecta type II: ultrastructure of teeth in sagittal sections.

    Science.gov (United States)

    Wieczorek, Aneta; Loster, Jolanta

    2013-01-01

    The morphological abnormalities of the teeth of patients affected by dentinogenesis imperfecta type 2 (DI-II) may underlie the difficulties with the clinical restoration of such teeth. We therefore performed a scanning electron microscopy (SEM) study of four permanent first mandibular molars of four DI-II patients with periapical pathosis. The teeth were prepared for SEM evaluation by standard methods. In the crown, the enamel presented a highly irregular surface with a number of cracks and crevices. In some places, only granular remains of the enamel were found, while in other parts of the crown, the enamel was absent. SEM examination revealed the structural changes responsible for the lower enamel's hardness and resistance to attrition, and for tooth wear, while the structural changes in the dentin may explain the failure of some adhesive restorative materials. This SEM study thus revealed structural defects which underlie the problems of attrition and restoration loss found in patients with this genetic dental condition.

  3. Teething and nutritional condition in children between 5 and 13 years.

    Directory of Open Access Journals (Sweden)

    Clotilde de la Caridad Mora Pérez

    2009-04-01

    Full Text Available Background: During last decades it has become increasingly evident the importance of nutritional factors in the development and renovation of buccal tissues, particularly of teeth. Objective: To characterize permanent teething and its relation with nutritional factors in children between 5 and 13 years. Methods: Cross-sectional descriptive, observational study developed in a universe formed by 1003 children of Health Area II in Cienfuegos, out of which a sample of 330 children was selected. Data was collected from schools, regarding the teething age and nutritional status. Ponder and measurements were carried out. Results: The average teething age was lower for girls in both maxillary bones; teething sequence was 6,1,2,4,5,3,7 for the maxilla and 6,1,2,3,4,5,7 for the inferior maxillary bone. There was a prevalence of normal weight among girls, followed by thin and undernourished values. Among boy, there was a prevalence of obesity, overweight and normal weight in that order. Nutritional statuses of thin and undernourished were related with a delayed teething, mainly in the inferior maxillary bone. Permanent teething was delayed with regard to the national media. Conclusion: A clear relation was established between teething age and nutrition, mainly among thin and undernourished children.

  4. Management of intruded primary teeth after traumatic injuries

    OpenAIRE

    Hirata, Ryoko; Kaihara, Yasutaka; Suzuki, Junji; Kozai, Katsuyuki

    2011-01-01

    Intrusions occur frequently in the primary dentition. It has been reported that conservative treatment of the intruded primary tooth is preferred if the apex is away from the permanent tooth germ. Conservative treatments include waiting for spontaneous re-eruption, and surgical re-positioning and fixation. Few papers have been published in Japan comparing the prognoses of intruded primary teeth between these two different modes of treatment. Therefore, optimal treatment for intruded primary t...

  5. Unusual ectopic eruption of a permanent central incisor following an intrusion injury to the primary tooth.

    Science.gov (United States)

    Canoglu, Ebru; Akcan, Cenk Ahmet; Baharoglu, Erdinç; Gungor, H Cem; Cehreli, Zafer C

    2008-10-01

    Intrusive luxation of primary teeth carries a high risk of damage to underlying permanent tooth germs. Ectopic eruption of permanent incisors is an unusual outcome of traumatic injury to their predecessors. In this case report, we describe the multidisciplinary management of the consequences of a primary tooth intrusion that led to severe ectopic eruption of the permanent left central incisor in a horizontal position at the level of the labial sulcus.

  6. Prevalence of supernumerary teeth in a nonsyndromic Syrian sample.

    Science.gov (United States)

    Burhan, Ahmad S; Nawaya, Fehmieh R; Arabi Katbi, Mohammad E; Al-Jawabra, Alaa S

    2015-12-01

    Supernumerary teeth (ST), also known as hyperdontia, is a condition in which more than the normal number of teeth are present in the series. The prevalence of ST varies between and within different populations. These teeth may cause various complications. The aim of the current study was to investigate the prevalence and characteristics of ST in Damascus inhabitants, Syria. A cross-sectional study was carried out using retrospectively collected digital panoramic radiographs of 2753 patients (1047 males and 1706 females) ranging in age from 12.2 to 20.5 years between January 2012 and December 2014. These radiographs were obtained from private dental offices spread across Damascus, Syria. For each patient with ST, the demographic variables, number, location, type, position, morphology of ST, and complications were recorded. ST were detected in 39 patients (1.4%), of whom 25 (64.1%) were males and 14 (35.9%) were females, with a male to female ratio of 1.8 : 1 (PMesiodens was the most prevalent ST (39.1%), followed by supernumerary premolars (28.3%), supernumerary laterals (26.1%), distomolars (4.3%), and paramolars (2.2%). This series includes cases with one and two ST. Of the 46 ST detected, 56.5% had a conical morphology, 89.1% were in a vertical position, and 19.6% were erupted. ST caused displacement of the adjacent teeth in 17 cases (37.0%) and the impaction of the permanent teeth in five cases (10.9%). The prevalence of ST in Damascus inhabitants was found to be 1.4%; the most frequent type was mesiodens. A conical morphology was found to be the most common form of ST. Displacement of permanent teeth is the most frequent complication. Further studies should be carried out on more representative samples of both the public and the private sector patients.

  7. Orthodontic treatment for deep bite and retroclined upper front teeth in children.

    Science.gov (United States)

    Millett, D T; Cunningham, S J; O'Brien, K D; Benson, P; Williams, A; de Oliveira, C M

    2006-10-18

    Correction of the type of dental problem where the bite is deep and the upper front teeth are retroclined (Class II division 2 malocclusion) may be carried out using different types of orthodontic treatment. However, in severe cases, surgery to the jaws in combination with orthodontics may be required. In growing children, treatment may sometimes be carried out using special upper and lower dental braces (functional appliances) that can be removed from the mouth. In many cases this treatment does not involve taking out any permanent teeth. Often, however, further treatment is needed with fixed braces to get the best result. In other cases, treatment aims to move the upper first permanent molars backwards to provide space for the correction of the front teeth. This may be carried out by applying a force to the teeth and jaws from the back of the head using a head brace (headgear) and transmitting this force to a part of a fixed or removable dental brace. This treatment may or may not involve the removal of permanent teeth. In some cases, neither functional appliances nor headgear are required and treatment may be carried out without extraction of any permanent teeth. Instead of using a headgear, in certain cases, the back teeth are held back in other ways such as with an arch across or in contact with the front of the roof of the mouth which links two bands glued to the back teeth. Often in these cases, two permanent teeth are taken out from the middle of the upper arch (one on each side) to provide room to correct the upper front teeth. It is important for orthodontists to find out whether orthodontic treatment only, carried out without the removal of permanent teeth, in children with a Class II division 2 malocclusion produces a result which is any different from no orthodontic treatment or orthodontic treatment only involving extraction of permanent teeth. To establish whether orthodontic treatment, carried out without the removal of permanent teeth, in children

  8. Temporary management of permanent central incisors loss caused by trauma in primary dentition with natural crowns: a case report.

    Science.gov (United States)

    Tüzüner, Tamer; Kuşgöz, Adem; Nur, Bilge Gülsüm

    2009-10-01

    Primary teeth injuries may cause developmental disturbances in the permanent dentition and loss of permanent incisors could be treated with different options. In this case report, an 11-year-old boy, with a history of trauma at the age of 4 years, is presented. Premature loss of permanent upper right central and upper left central teeth because of the mobility and arrest in root development were treated using patient's own natural crowns on a removable appliance. This treatment option could be considered as an esthetic and functional temporary management of permanent central incisors loss until the definitive treatment will be completed in the future.

  9. DENTAL CARIES LEADING TO PREMATURE LOSS OF BABY TEETH- IMPLICATIONS AND MANAGEMENT

    Directory of Open Access Journals (Sweden)

    Rachana Bahuguna

    2011-12-01

    Full Text Available Dental caries is a destructive process causing decalcification of the tooth enamel and leading to continued destruction of enamel and dentin, and cavitation of the tooth. Dental caries can occur soon after eruption of the primary teeth, starting at 6 months of age. Primary teeth are present for a reason. One key reason is that they save space for the permanent tooth, which will erupt into its position when the deciduous / primary tooth is lost normally. If a primary tooth (baby or milk tooth, has to be removed early due to say, an abscess which is mostly a result of dental caries, a space maintainer may be recommended to save the space. If the space is not preserved, the other teeth may drift causing difficult to treat crowding and orthodontic problems. These "spacers" are placed temporarily, and are not permanent. They are removed when the new tooth (usually a bicuspid erupts or the abutment teeth get loose.

  10. Oscillating Permanent Magnets.

    Science.gov (United States)

    Michaelis, M. M.; Haines, C. M.

    1989-01-01

    Describes several ways to partially levitate permanent magnets. Computes field line geometries and oscillation frequencies. Provides several diagrams illustrating the mechanism of the oscillation. (YP)

  11. Bilateral fusion of mandibular second molars with supernumerary teeth: case report

    Directory of Open Access Journals (Sweden)

    Nunes Eduardo

    2002-01-01

    Full Text Available Fusion is a developmental anomaly characterized by the union of two adjacent teeth. In this article we report a rare case of bilateral fusion of permanent mandibular second molars with supernumerary teeth. The rarity with which this entity appears, along with its complex characteristics, often make it difficult to treat. The endodontic management of one tooth is described, as well as the successful treatment of a periradicular lesion.

  12. Revascularization of Immature Necrotic Teeth: Platelet rich Fibrin an Edge over Platelet rich Plasma

    OpenAIRE

    Neelam Mittal; Isha Narang

    2012-01-01

    Introduction: Revascularization is one such entity that has found its clinical application in the field of endodontics for the manage-ment of immature permanent necrotic teeth. The protocols for revascularization of such teeth focus especially on delivery of stem cells and scaffolds in a nonsurgical manner rather than concentrated growth micro molecules.The hypothesis: This article proposes the role of platelet concentrates such as platelet rich fibrin (PRF) and platelet rich plasma (PRP) in ...

  13. Cleidocranial Dysplasia Case Report: Remodeling of Teeth as Aesthetic Restorative Treatment

    OpenAIRE

    Leonardo Fernandes da Cunha; Isabela Maria Caetano; Fernando Dalitz; Carla Castiglia Gonzaga; José Mondelli

    2014-01-01

    Cleidocranial dysplasia (CCD), is an autosomal dominant disorder with a prevalence of 1 in 1,000,000 individuals. It is generally characterized by orofacial manifestations, including enamel hypoplasia, retained primary teeth, and impacted permanent and supernumerary teeth. The successful treatment involving a timing intervention (orthodontic-maxillofacial surgeons-restorative) is already described. However, the restorative treatment might improve the aesthetic final result in dentistry manage...

  14. Analysis of the Permanent Tooth Eruption and Contraction of Dental Caries Based on Physical Development in School Children

    OpenAIRE

    相澤 徳久; 結城 昌子; アイザワ ノリヒサ; ユキ マサコ; Aizawa, Norihisa; Masako YUKI

    2006-01-01

    We performed a cohort study on the physical development, eruption of permanent teeth, and contraction of dental caries in school children. To establish criteria for the effective maintenance of dental hygiene, we analyzed the relationship between the eruption of permanent teeth and contraction of dental caries based on the physical development. The subjects were 373 elementary school children in Koriyama City, consisting of 215 boys and 158 girls, who were examined from their first to sixth g...

  15. A paradigm shift in endodontic management of immature teeth: conservation of stem cells for regeneration.

    Science.gov (United States)

    Huang, George T-J

    2008-06-01

    This article will review the new concept of regenerative endodontics in the management of immature permanent teeth. The potential role of stem cells to regenerate immature permanent teeth after conservative treatment will be discussed. Two sets of data source are focused in this review: (i) the characterization of various dental stem cells discovered since 2000 and (ii) recent clinical case reports showing that after conservative treatment, severely infected immature teeth with periradicular periodontitis and abscess can undergo healing and apexogenesis or maturogenesis. A new protocol of treating endodontically involved immature permanent teeth based on published articles to date is summarized in the review. The key procedures of the protocol are (1) minimal or no instrumentation of the canal while relying on a gentle but thorough irrigation of the canal system, (2) the disinfection is augmented with intra-canal medication of a triple-antibiotic paste between appointments, and (3) the treated tooth is sealed with mineral trioxide aggregate (MTA) and glass ionomer/resin cement at the completion of the treatment. Periodical follow-ups will take place to observe any continued maturation of the root. While more clinical research is needed, regenerative endodontics promotes a paradigm shift in treating endodontically involved immature permanent teeth from performing apexification procedures to conserving any dental stem cells that might remain in the disinfected viable tissues to allow tissue regeneration and repair to achieve apexogenesis/maturogenesis.

  16. The untreated dental caries in primary teeth: would it be problems?

    Directory of Open Access Journals (Sweden)

    Udijanto Tedjosasongko

    2016-06-01

    Full Text Available Dental caries still remain as the most prevalent oral health disease in children. Many efforts have been done to prevent dental caries in children, but unfortunately there are dental practitioners who still have false mindset and prefer not to treat the dental caries case in primary teeth with the most common reasons are because it will be replaced with the permanent teeth. There are many negative effect will occur if the dental caries treatments in primary teeth are neglected.This topic would review the effects of untreated dental caries in children based on research reports.Severely decayed teeth have an important impact on children’s general health, nutrition, growth and body weight by causing discomfort, pain, sleeping problems, learning disorders and absence from school.  Untreated caries may affect seriously the quality of children’s life because of pain and discomfort, which could lead to acute and chronic infections, oral mucosal conditions and altered eating and sleeping habits. Furthermore, untreated caries in primary teeth can have a lasting detrimental impact on the permanent dentition by causing high caries risk or developmental defects of the permanent successor tooth. Moreover it has been reported that children at each higher level of caries had significantly lower height and weight outcomes than those with lower caries levels. The untreated dental caries in primary teeth would lead the children to poor growth and health which lowering the their quality of life.

  17. Congenital adrenal hyperplasia: a case report with premature teeth exfoliation and bone resorption.

    Science.gov (United States)

    Angelopoulou, Matina V; Kontogiorgos, Elias; Emmanouil, Dimitris

    2015-06-01

    Congenital adrenal hyperplasia (CAH) is an inherited autosomal recessive disorder characterized by insufficient production of cortisol. The aim of this case report was to present a child with CAH, premature exfoliation of primary teeth and accelerated eruption of his permanent teeth related to bone resorption. A 4.5-year-old Caucasian boy with CAH and long-term administration of glucocorticoids was referred for dental restoration. Clinical examination revealed primary molars with worn stainless steel crowns, severe attrition of the upper canines, and absence of the upper incisors. Before the completion of treatment, abnormal mobility of the first upper primary molars and the lower incisors was detected, and a few days later the teeth exfoliated prematurely. Histologic examination revealed normal tooth structure. Alkaline phosphatase and blood cells values were normal. Eruption of the permanent dentition was also accelerated. Tooth mobility was noticed in the permanent teeth as soon as they erupted, along with bone destruction. Examination revealed an elevated level of receptor activator of nuclear factor-κB ligand and lower-than-normal osteoprotegerin and vitamin D levels. The patient was treated with vitamin D supplements, and his teeth have been stable ever since. CAH is a serious chronic disorder appearing in children with accelerated dental development and possibly premature loss of primary teeth.

  18. 77 FR 29914 - Bovine Spongiform Encephalopathy; Importation of Bovines and Bovine Products

    Science.gov (United States)

    2012-05-21

    ... RIN 0579-AC68 Bovine Spongiform Encephalopathy; Importation of Bovines and Bovine Products AGENCY... live bovines and products derived from bovines with regard to bovine spongiform encephalopathy. This... with regard to bovine spongiform encephalopathy. Comments on the proposed rule were required to......

  19. Dovetail spoke internal permanent magnet machine

    Science.gov (United States)

    Alexander, James Pellegrino; EL-Refaie, Ayman Mohamed Fawzi; Lokhandwalla, Murtuza; Shah, Manoj Ramprasad; VanDam, Jeremy Daniel

    2011-08-23

    An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple pair of permanent magnets for generating a magnetic field, which magnetic field interacts with the stator magnetic field to produce a torque. The multiple pair of permanent magnets are disposed between the stacks. The rotor assembly also includes multiple middle wedges mounted between each pair of the multiple permanent magnets.

  20. Surgical management of impacted incisors in associate with supernumerary teeth: A combine case report of spontaneous eruption and orthodontic extrusion

    Directory of Open Access Journals (Sweden)

    D Das

    2012-01-01

    Full Text Available Maxillary permanent incisors impaction is not a frequent case in dental practice, but its treatment is challenging because of its importance to facial esthetics. Supernumerary teeth are the main cause of impaction of upper incisors. Supernumerary teeth when present can cause both esthetic and pathologic problems. Early detection of such teeth is most important if complications are to be avoided. In this reported case, the orthopantamogram of a 9-year-old boy revealed two impacted supernumerary teeth in the maxillary anterior region, which was interfering with the eruption of the permanent central incisors. The impacted supernumerary teeth were surgically removed, 11 was repositioned in the arch as it was situated very high in the arch, close to the nasal floor. Twenty-one erupted spontaneously but orthodontic force was applied over 11 to bring it into the occlusion and alignment was achieved with 0.014 mm NiTi wire.

  1. 多发性多生牙1例%A case report of multiple supernumerary teeth

    Institute of Scientific and Technical Information of China (English)

    姜华

    2013-01-01

      多生牙的发生率占正常人群的1%~3%。多生牙常见于恒牙列,数目一般多见于1~3颗,5颗以上非常罕见。%Incidence of supernumerary teeth in total normal population is 1%-3%. Supernumerary teeth are com-mon in the permanent dentition, and 1-3 teeth are common, but more than 5 teeth are rare.

  2. Multiple Supernumerary Teeth in a Non-Syndromic Patient: A Case Report

    Directory of Open Access Journals (Sweden)

    Majid Eshgh Pour

    2013-01-01

    Full Text Available Introduction: Multiple supernumerary teeth are a rare phenomenon. It occurs more often in patients with syndromes such as Gardner's syndrome, cleidocranial dysplasia and so on. This phenomenon in absence of such syndromes is rare. The purpose of this report was to introduce a case of non-syndromic multiple supernumerary impacted teeth.Case Report: A 29-year-old woman with no skeletal, metabolic, systemic and mental disorder was referred to oral and maxillofacial department of Mashhad dental school. In clinical evaluation, seven Permanent teeth were missing. In radiographic evaluation, there were a total of 15 impacted teeth which 7 of them were supernumerary.Conclusion: Missing or Excess of one or more teeth usually leads to occlusal and functional problems. In these cases, a complete clinical and radiographic examination accompanieal by a precise history should be performed to plan a suitable surgical-orthodontic-prosthetic treatment.

  3. Trace element analysis of teeth from pre-Columbian population groups in Mexico

    Energy Technology Data Exchange (ETDEWEB)

    Solis, C.; Oliver, A.; Andrade, E.; Macias, R. [Instituto de Fisica, Universidad Nacional Autonoma de Mexico, Mexico (Mexico); Mansilla, J. [Departamento de Antropologia Fisica, Instituto Nacional de Antropologia e Historia, Mexico (Mexico); Chavez-Lomeli, M.E.

    1999-07-01

    Human teeth from pre-Columbian and recent population groups have been analyzed by PIXE. Ancient teeth corresponding to children and adults were obtained from archaeological burials located in five geographic areas of Mexico. Inter-specific and inter-site differences in the trace element contents of enamel were compared in order to get some insight into differences in diet, environmental conditions, teeth health, disease state and post mortem alteration among the co-occurring populations. For permanent teeth from adults, small variations in trace element levels were found depending on the collection site or tooth health, but for deciduous teeth from children, the concentration of elements such as Mn, Fe and Sr varied considerably. In this work, the possible sources of variation are discussed. (author)

  4. Nanostructural effect of acid-etching and fluoride application on human primary and permanent tooth enamels

    Energy Technology Data Exchange (ETDEWEB)

    Cheong, Youjin [Department of Biomedical Engineering and Healthcare Industry Research Institute, College of Medicine, Kyung Hee University, Seoul (Korea, Republic of); Choi, Samjin [Department of Biomedical Engineering and Healthcare Industry Research Institute, College of Medicine, Kyung Hee University, Seoul (Korea, Republic of); Department of Orthodontics, College of Dental Medicine, Kyung Hee University, Seoul (Korea, Republic of); Kim, So Jung [Department of Pediatric Dentistry, College of Dental Medicine, Kyung Hee University, Seoul (Korea, Republic of); Park, Hun-Kuk, E-mail: sigmoidus@khu.ac.kr [Department of Biomedical Engineering and Healthcare Industry Research Institute, College of Medicine, Kyung Hee University, Seoul (Korea, Republic of); Program of Medical Engineering, Kyung Hee University, Seoul (Korea, Republic of)

    2012-07-01

    This study examined the nanostructural effects of fluoride application and the acid-etching time with respect to the time elapsed after fluoride application on the primary and permanent tooth enamel layers using atomic force microscopy (AFM) and scanning electron microscopy (SEM). 192 non-carious teeth were assigned to sixteen experimental groups (n = 12) including primary (1 to 8) and permanent (9 to 16) teeth, based on the timing of acid-etching with 37% phosphoric acid after an acidulated phosphate fluoride (APF) pre-treatment. The APF pre-treatment led to a decrease in surface roughness in both the primary and permanent teeth. After the APF treatment, the roughness in both primary and permanent teeth increased with the time elapsed. An acid-etching time of 40 s led to increased nanostructural changes in the enamel surfaces compared to the conventional acid-etching time of 20 s. This acid-etching process led to a higher roughness changes in the primary teeth than in the permanent teeth. To obtain proper enamel adhesion of a sealant after APF pre-treatment, it is important to apply acid-etching two weeks after pre-treatment. In addition, the acid-etching time should be prolonged to apply etching more quickly than two weeks, regardless of the primary and permanent teeth. Highlights: Black-Right-Pointing-Pointer APF pre-treatment led to decreased surface roughness in the enamel. Black-Right-Pointing-Pointer After APF treatment, the more roughness increased with increasing time elapsed. Black-Right-Pointing-Pointer Acid-etching should be performed two weeks after fluoride application.

  5. DENTAL CARE FOR CHILDREN AFTER REPLANTATION OF AVULSED PERMANENT INCISORS

    Directory of Open Access Journals (Sweden)

    Rossitza Kabaktchieva

    2016-12-01

    Full Text Available The diagnosis avulsion of permanent tooth/teeth is an emergency situation which has special requirements in respect of proper storage of the avulsed tooth, the need of urgent medical/dental care, time past till replantation and splinting, the need for endodontic treatment and long term follow up period. Those clinical actions depend on three groups: parents/people who are with the child in the moment when trauma happens and give the first aid; dental specialist- surgeon who replants the tooth/teeth; dental specialist- endodontist who takes care of the endodontic treatment and the long period after treatment for follow up and observation of the replanted teeth. The aim of the paper is to present the dental postoperative care in a couple of cases of children with trauma and replanted avulsed permanent incisors. Material and methods: We present four clinical cases of children who get 6 permanent upper incisors replanted. Replantation is made by the oral surgeon. Treatment and observation after replantation are made by dental specialists of pediatric dentistry and conservative dentistry. All 4 cases get 3 years follow up period. Results: After replantation of 2 central incisors with complete root development (first clinical case the left one has developed a resorption of the root but the right one is in a stable condition. Replantation of 3 teeth with incomplete root development (second and third clinical cases where the patients refer to specialized surgical care less than 60 minutes after injury and store the teeth in different ways lead to different clinical results. In the case of avulsed upper right incisor (second case, it is stored in milk and we observe revascularization followed by partial root canal obliteration. The tooth is scheduled for endodontic treatment. In the case of upper central incisors, both kept dry till replantation in the alveolus filled up with substitute bone, we observe fast root resorption which going to lead to early

  6. Genotoxic effect of formocresol pulp therapy of deciduous teeth.

    Science.gov (United States)

    Lucas Leite, Ana Catarina Gaioso; Rosenblatt, Aronita; da Silva Calixto, Merilane; da Silva, Cirlene Maria; Santos, Neide

    2012-08-30

    To investigate whether formocresol, in Buckley's original formulation, used for pulp therapy of deciduous teeth, can have a genotoxic effect. Genotoxicity was tested in lymphocyte cultures from the peripheral blood of children aged 5-10y, in Recife, Pernambuco, Brazil. This was a case-control study. The sample comprised 40 children who had primary teeth with non-vital pulps. Two venous blood samples (6-8ml) were collected from each child, the first prior to pulp therapy (control group) and the second 24h after pulp therapy (experimental group). Lymphocyte cultures were grown in 78% RPMI 1640 medium, 20% fetal bovine serum, 2% phytohemagglutinin. The lymphocytes were assessed for chromosomal aberrations; each sample involved analysis of 100 metaphases. There was a statistically significant difference between the control and treated groups for the isochromatid gap (pformocresol in pediatric dentistry is recommended. Copyright © 2012 Elsevier B.V. All rights reserved.

  7. Periodontal ligament stem cells modulate root resorption of human primary teeth via Runx2 regulating RANKL/OPG system.

    Science.gov (United States)

    Li, Bei; Zhang, Yu; Wang, Qingchao; Dong, Zhiwei; Shang, Linjuan; Wu, Lizheng; Wang, Xiaojing; Jin, Yan

    2014-10-15

    Physiological primary teeth exfoliation is a normal phenomenon during teeth development. However, retained primary teeth can often be observed in the patients with cleidocranial dysplasia (CCD) caused by mutation of Runx2. The potential regulative mechanism is still unknown. In the present study, periodontal ligament stem cells (PDLSCs) were derived from different resorbed stages of primary teeth and permanent teeth from normal patients and primary teeth from CCD patient. The proliferative, osteogenic and osteoclast-inductive capacities of PDLSCs from each group were detected. We demonstrated here that the proliferative ability of PDLSCs was reduced while the osteogenic and the osteoclast-inductive capacity of PDLSCs were enhanced during root resorption. The results also showed that PDLSCs from permanent teeth and CCD patient expressed low level of Runx2 and RANKL while high level of OPG. However, expression of Runx2 and RANKL were increased while expression of OPG was decreased in PDLSCs derived from resorbed teeth. Furthermore, Runx2 regulating the expression of RANKL and OPG and the osteoclast-inductive capacity of PDLSCs were confirmed by gain or loss of function assay. These data suggest that PDLSCs promote osteoclast differentiation via Runx2 upregulating RANKL and downregulating OPG, leading to enhanced root resorption that results in physiological exfoliation of primary teeth.

  8. Triple Teeth: Report of an Unusual Case

    OpenAIRE

    Prashant Babaji; M. A. Prasanth; Gowda, Ajith R.; Soumya Ajith; Henston D'Souza; Ashok, K. P.

    2012-01-01

    Fusion or synodontia is a union of two or more than two developing teeth. Commonly fusion occurs between teeth of the same dentition, mixed dentition, or between normal and supernumerary teeth. Fused primary teeth present with several clinical problems like caries, periodontal problem, arch asymmetry, delayed eruption, ectopic eruption of succedaneous teeth, aesthetic, and other complications. This paper presents a rare and unusual case of triple teeth in mandibular primary dentition.

  9. Triple Teeth: Report of an Unusual Case

    Directory of Open Access Journals (Sweden)

    Prashant Babaji

    2012-01-01

    Full Text Available Fusion or synodontia is a union of two or more than two developing teeth. Commonly fusion occurs between teeth of the same dentition, mixed dentition, or between normal and supernumerary teeth. Fused primary teeth present with several clinical problems like caries, periodontal problem, arch asymmetry, delayed eruption, ectopic eruption of succedaneous teeth, aesthetic, and other complications. This paper presents a rare and unusual case of triple teeth in mandibular primary dentition.

  10. Supernumerary Teeth in Nepalese Children

    Directory of Open Access Journals (Sweden)

    Varun Pratap Singh

    2014-01-01

    Full Text Available Objective. The objectives of the present study were to investigate the prevalence and characteristics of supernumerary teeth in a patient sample of Nepalese children. Study Design. A survey was performed on 2684 patients (1829 females and 1035 males ranging in age from 6 to 14 for the presence of supernumerary teeth. For each patient with supernumerary teeth the demographic variables (age and sex, number, location, eruption status, and morphology were recorded. Descriptive statistics were performed. Results. Supernumerary teeth were detected in 46 subjects (1.6%, of which 26 were males and 20 were females with a male : female ratio of 1.3 : 1. The most commonly found supernumerary tooth was mesiodens followed by maxillary premolars, maxillary lateral incisor, and mandibular lateral incisor. Of the 55 supernumerary teeth examined, 58.18% (n=32 had conical morphology, followed by tuberculate (30.90%, n=17 and supplemental (10.90%, n=6 forms. The majority of the supernumerary teeth were erupted (56.36%, n=31. Conclusion. The prevalence of supernumerary teeth in Nepalese children was found to be 1.6%, the most frequent type being mesiodens. Conical morphology was found to be the most common form of supernumerary tooth.

  11. Supernumerary teeth in Nepalese children.

    Science.gov (United States)

    Singh, Varun Pratap; Sharma, Amita; Sharma, Sonam

    2014-01-01

    The objectives of the present study were to investigate the prevalence and characteristics of supernumerary teeth in a patient sample of Nepalese children. A survey was performed on 2684 patients (1829 females and 1035 males) ranging in age from 6 to 14 for the presence of supernumerary teeth. For each patient with supernumerary teeth the demographic variables (age and sex), number, location, eruption status, and morphology were recorded. Descriptive statistics were performed. Supernumerary teeth were detected in 46 subjects (1.6%), of which 26 were males and 20 were females with a male : female ratio of 1.3 : 1. The most commonly found supernumerary tooth was mesiodens followed by maxillary premolars, maxillary lateral incisor, and mandibular lateral incisor. Of the 55 supernumerary teeth examined, 58.18% (n = 32) had conical morphology, followed by tuberculate (30.90%, n = 17) and supplemental (10.90%, n = 6) forms. The majority of the supernumerary teeth were erupted (56.36%, n = 31). The prevalence of supernumerary teeth in Nepalese children was found to be 1.6%, the most frequent type being mesiodens. Conical morphology was found to be the most common form of supernumerary tooth.

  12. Biodentine Pulpotomy in Mature Permanent Molar: A Case Report

    Science.gov (United States)

    2016-01-01

    Irreversible pulpitis is the most common reason for endodontic treatment in primary and permanent teeth. Root canal therapy and extraction are the two viable and most documented treatment options for the same. Studies with regards to management of mature permanent teeth with carious exposure and treatment with vital pulp therapies such as adult permanent tooth pulpotomy are scarce. However, permanent tooth pulpotomy with the new calcium-silicate based cements (Mineral Trioxide Aggregate and Biodentine) can help preserve the tooth pulp vitality and promote healing and repair foregoing the more invasive root canal therapy procedure. A 12-year old male patient with irreversible pulpitis in right mandibular first permanent molar was treated with complete coronal pulpotomy with placement of Biodentine in the pulp chamber and a full coronal coverage using stainless steel crown. Clinical and radiographic examinations were performed at three, six, twelve and eighteen months. At the end of 18 months, the patient was completely asymptomatic and the tooth was free of any clinical and radiographic signs of inflammation and infection. PMID:27630966

  13. Biodentine Pulpotomy in Mature Permanent Molar: A Case Report.

    Science.gov (United States)

    Soni, Harleen Kaur

    2016-07-01

    Irreversible pulpitis is the most common reason for endodontic treatment in primary and permanent teeth. Root canal therapy and extraction are the two viable and most documented treatment options for the same. Studies with regards to management of mature permanent teeth with carious exposure and treatment with vital pulp therapies such as adult permanent tooth pulpotomy are scarce. However, permanent tooth pulpotomy with the new calcium-silicate based cements (Mineral Trioxide Aggregate and Biodentine) can help preserve the tooth pulp vitality and promote healing and repair foregoing the more invasive root canal therapy procedure. A 12-year old male patient with irreversible pulpitis in right mandibular first permanent molar was treated with complete coronal pulpotomy with placement of Biodentine in the pulp chamber and a full coronal coverage using stainless steel crown. Clinical and radiographic examinations were performed at three, six, twelve and eighteen months. At the end of 18 months, the patient was completely asymptomatic and the tooth was free of any clinical and radiographic signs of inflammation and infection.

  14. Permanences GAG-EPA

    CERN Multimedia

    GAC-EPA

    2015-01-01

    Le GAC organise chaque mois des permanences avec entretiens individuels. La prochaine permanence se tiendra le : Mardi 5 mai de 13 h 30 à 16 h 00 Salle de réunion de l’Association du personnel Les permanences suivantes auront lieu les mardis 2 juin, 1er septembre, 6 octobre, 3 novembre et 1er décembre 2015. Les permanences du Groupement des Anciens sont ouvertes aux bénéficiaires de la Caisse de pensions (y compris les conjoints survivants) et à tous ceux qui approchent de la retraite. Nous invitons vivement ces derniers à s’associer à notre groupement en se procurant, auprès de l’Association du personnel, les documents nécessaires.

  15. A Case Report of Dilacerated Crown of a Permanent Mandibular Central Incisor.

    Science.gov (United States)

    Bolhari, Behnam; Pirmoazen, Salma; Taftian, Ensieh; Dehghan, Somayeh

    2016-11-01

    Trauma to primary teeth can lead to devastating sequels in development of permanent successors. The disturbance may range from enamel hypoplasia and/or hypo-calcification to arrest of dental bud development. Crown dilaceration of permanent teeth is one of the consequences of trauma to deciduous teeth mainly due to intrusion or avulsion. This report presents a mandibular central incisor with dilacerated crown and yellowish discoloration with symptomatic apical abscess. History revealed avulsion of primary mandibular central incisors. The purpose of this report is to present: 1. Reasons of dilacerated crown, yellowish discoloration and necrotic pulp in this case, 2. Treatment options in different types of crown dilacerations and also in this case. The tooth was successfully managed by nonsurgical root canal therapy and restoration with composite resin to restore esthetics. We emphasize that trauma to deciduous teeth should not be understated, and regular follow up is essential.

  16. Investigation and analysis of 1 793 cases of 7~12 years old children permanent teeth caries disease condition in Yinch-uan city Yueyahu ecological migrants district and evaluation of atraumatic filling technique treatment effect%银川市月牙湖生态移民区1793例7~12岁儿童恒牙龋病状况调查分析及非创伤性充填技术治疗的效果评价

    Institute of Scientific and Technical Information of China (English)

    张馨; 李玲玲; 霍永力

    2016-01-01

    Objective:To understand the children permanent teeth caries disease prevalence condition in Yinchuan city Yueyahu ecological migrants district and the treatment effect of atraumatic filling technique(ART).Methods:1 793 cases of 7~12 years old children were given oral health examination and oral health education.150 cases of children accorded with the treatment standard of ART were selected.The ART treatment was given by using oral portable dental chair on scene.The effect was observed after 3 months of ART filling.Results:The children permanent teeth caries prevalence rate of Yinchuan city Yueyahu ecological migrants district was higher than that of the urban children(the third national epidemiological survey)(P<0.05),and the caries prevalence rate of girls was higher than that of boys.After ART filling technology,the serviceability rate was 94.92%.Conclusion:7~12 years old children of ecological migrants district because of the traffic and economic constraints,and the permanent teeth caries treatment rate is low.ART filling technology is easy to operate,and it can be applied on the prevention and treatment of early childhood permanent teeth caries disease in the economic underdeveloped remote areas.%目的:了解银川市月牙湖生态移民区儿童恒牙龋病患病情况及非创伤性充填技术(ART)治疗效果。方法:对7~12岁1793例儿童进行口腔健康检查和口腔健康教育,筛选符合ART治疗标准的150例儿童,利用口腔便携式牙科治疗椅现场进行ART治疗,ART充填后3个月进行效果观察。结果:银川市月牙湖生态移民区儿童恒牙患龋率高于城市儿童(第三次全国流调)(P<0.05),女生患龋率高于男生。经ART治疗后完好率94.92%。结论:生态移民区7~12岁儿童受交通和经济制约,恒牙龋病治疗率较低。ART充填技术易于操作,可应用于经济欠发达的偏远地区儿童早期恒牙龋病防治。

  17. Different treatment protocols for different pulpal and periapical diagnoses of 72 cracked teeth.

    Science.gov (United States)

    Kim, Sin-Young; Kim, Su-Hyun; Cho, Soo-Bin; Lee, Gyung-Ok; Yang, Sung-Eun

    2013-04-01

    The treatment plan for cracked teeth depends on the extent of the crack. A tooth with an extensive crack of long duration may be more likely to require root canal treatment. The purpose of this study was to analyze the characteristics of cracked teeth and to assess the outcome of different treatment protocols depending on the pulpal and periapical diagnoses. Seventy-two of 476 crown-restored teeth were diagnosed as cracked teeth. The location of the cracked teeth, age and sex of the patients, restoration materials, a diagnosis of pulp and apex, and the periodontal probing depth were analyzed. Cracked teeth were treated by different treatment protocols depending on the pulpal and periapical diagnoses. Mandibular first molars (27.8%) were the most frequently involved teeth followed by maxillary first molars (25%), maxillary second molars (22.2%), and mandibular second molars (19.4%). The most frequently involved ages were 40-49 and 50-59 years. Cracks occurred mainly in nonbonded restorations such as gold (26.4%) and amalgam (12.5%), and 48.6% of cracks were found in intact teeth. In this study, 60 teeth (83.3%) were treated with root canal treatment before being restored with a permanent crown, and only 12 teeth (16.7%) remained vital and were restored with a permanent crown without root canal treatment. The proportion of teeth treated with root canal treatment increased along with a deep periodontal probing depth corresponding to the crack. The prognosis was less favorable in cracked teeth with a deep probing depth. In this study, the proportion of root canal treatment in the cracked teeth was higher than other studies. Many patients are referred to an endodontist in a university hospital after a long time has passed since the symptom started. Early recognition can help to avoid the propagation of a crack into the pulp chamber or subgingival level. Furthermore, it is important to investigate factors related to cracked teeth and develop different treatment protocols

  18. Cogging torque mitigation of modular permanent magnet machines

    OpenAIRE

    Li, G. J.; Ren, B.; Zhu, Z-Q.; Li, Y X; Ma, J.

    2015-01-01

    This paper proposes a novel cogging torque mitigation method for modular permanent magnet (PM) machines with flux gaps in alternate stator teeth. The slot openings of the modular PM machines are divided into two groups in a special way. By shifting the slot openings of two groups in opposite directions with the same angle, the machine cogging torque can be significantly reduced. Analytical formula of the desired shift angle is derived, and can be applicable to other modular machines with diff...

  19. Retention of permanent incisors by mesiodens: a family affair.

    Science.gov (United States)

    Gallas, M M; García, A

    2000-01-22

    The term mesiodens refers to a supernumerary tooth that is present in the midline of the maxilla between the two central incisors. One or two mesiodentes may be present. We present a rare case of two sisters, in both of whom a pair of mesiodentes caused the retention of permanent incisors. They were referred to our hospital with asymptomatic delayed eruption of upper incisors. This article is written to point out genetic factors as the possible origin of supernumerary teeth.

  20. The Use of Glass-fibers Ribbon and Composite for Prosthetic Restoration of Missing Primary Teeth-Laboratory and Clinical Research

    OpenAIRE

    Zilberman, Uri; Lasilla, Lippo

    2014-01-01

    Very few modalities can be used for restoring missing primary anterior teeth, although the impact of missing anterior teeth during early childhood can be harmful. In the permanent dentition the use of glass-fibers ribbon and composite materials are frequently used for restoring missing teeth with no or minimal preparation. The purpose of this study was to examine the possibility to use the glass-fibers ribbon (ever-Stick from GC Corporation, Japan) together with esthetic composite materials (...

  1. Subgingival bacteria in a case of prepubertal periodontitis, before and one year after extractions of the affected primary teeth.

    Science.gov (United States)

    Ram, D; Bimstein, E

    1994-01-01

    The treatment of children with prepubertal periodontitis (PP), may be complicated by the extent of the lesions and the possibility of tetracycline stain of the developing permanent dentition. Therefore, with the purpose of preventing the infection of permanent teeth during the mixed dentition, it has been recommended that the treatment of children with PP, should include the early extraction of the primary teeth affected with alveolar bone loss (ABL). Still, there is little evidence which confirms that extraction of the affected primary teeth do in fact reduce the periodonto-pathogens load of the subgingival plaque. The present study reports values of colony forming units (CFU) of total anaerobic bacteria, Actinobacillus actynomicetemcomitans (Aa) and Porphyromonas gingivalis (Pg) from the subgingival plaque from a child with PP, collected immediately before and 1 year after extractions of the primary teeth affected with ABL. CFU of Aa and Pg developed only from the subgingival plaque collected before the extraction of the primary teeth affected with ABL. These findings suggest that in cases of PP, extraction of the affected primary teeth may reduce the possibility of infection of the periodontum of the permanent teeth during the mixed dentition period.

  2. Dentin comparison in primary and permanent molars under transmitted and polarised light microscopy: An in vitro study

    Directory of Open Access Journals (Sweden)

    Chowdhary N

    2010-09-01

    Full Text Available Dentin is the fundamental substrate of restorative dentistry and its properties and characteristics are key determinants of nearly all restorative, preventive and disease processes of the teeth. The intrinsic permeability of dentin is responsible for permitting bacterial or chemical substances to diffuse across the dentin and irritate the pulpal and periradicular tissues. Improved understanding of the dentin structure and nature will have important consequences for today′s dental procedures. The aims of the study were to observe the direction of dentinal tubules, interglobular dentin, incremental lines of dentin and the dead tracts. Materials and Methods: A total of 30 teeth (15 primary and 15 permanent molars, unrestored, noncarious, hypoplastic extracted molars were used. Longitudinal ground sections of teeth were obtained using hard tissue microtome. Results: Examination of ground sections of the primary teeth dentin showed "s"-shaped curvature in four (26.7% specimens and a straight course of dentinal tubules in 11 (73.3% specimens out of 15 teeth examined whereas in permanent teeth, all 15 (100% specimens showed an "s"-shaped curvature. These results are statistically highly significant (P < 0.001. Conclusion: Dentinal tubules followed an "s"-shaped course in all the 15 (100% permanent molars and in four (26.7% primary molars. There was no significant difference in the occurrence of interglobular dentin of primary and permanent molars. But, they were at angles in the primary teeth.

  3. Restoring primary anterior teeth.

    Science.gov (United States)

    Waggoner, William F

    2002-01-01

    A variety of esthetic restorative materials are available for restoring primary incisors. Knowledge of the specific strengths, weakness, and properties of each material will enhance the clinician's ability to make the best choice of selection for each individual situation. Intracoronal restorations of primary teeth may utilize resin composites, glass ionomer cements, resin-modified ionomers, or polyacid-modified resins. Each has distinct advantages and disadvantages and the clinical conditions of placement may be a strong determining factor as to which material is utilized. Full coronal restoration of primary incisors may be indicated for a number of reasons. Crowns available for restoration of primary incisors include those that are directly bonded onto the tooth, which generally are a resin material, and those crowns that are luted onto the tooth and are some type of stainless steel crown. However, due to lack of supporting clinical data, none of the crowns can be said to be superior to the others under all circumstances. Though caries in the mandibular region is rare, restorative solutions for mandibular incisors are needed. Neither stainless steel crowns nor celluloid crown forms are made specifically for mandibular incisors. Many options exist to repair carious primary incisors, but there is insufficient controlled, clinical data to suggest that one type of restoration is superior to another. This does not discount the fact that dentists have been using many of these crowns for years with much success. Operator preferences, esthetic demands by parents, the child's behavior, and moisture and hemorrhage control are all variables which affect the decision and ultimate outcome of whatever restorative treatment is chosen.

  4. Multiple crown size variables of the upper incisors in patients with supernumerary teeth compared with controls

    NARCIS (Netherlands)

    Khalaf, K.; Smith, R. N.; Elcock, C.; Brook, A. H.

    2009-01-01

    Aims: As part of ongoing studies of the aetiology of dental anomalies the aims of this study were to identify multiple components of tooth size of the upper permanent incisors in 34 patients with supernumerary teeth and to compare them with those in a control group to determine whether the presence

  5. Simplified technique for easy extraction of impacted supernumerary teeth using guided surgery.

    Science.gov (United States)

    Nam, Ok Hyung; Lee, Hyeonjong; Kim, Mi Sun; Lee, Hyo-Seol; Choi, Sung Chul

    2017-01-01

    Most mesiodens remain impacted and can affect the growth and development of adjacent permanent teeth. Impacted mesiodens are usually located in an intraosseous position associated with complicated anatomical structures, necessitating minimally invasive surgical approaches. This article demonstrates a simple customized surgical stent for extraction of impacted mesiodens. Its use and advantages are described.

  6. Bilateral Intraosseous Migration of Mandibular Second Premolars in a Patient with Nine Missing Teeth

    Directory of Open Access Journals (Sweden)

    H. Shahoon

    2010-03-01

    Full Text Available Intraosseous migration is an unusual developmental dental anomaly, which demonstrates horizontal movement of unerupted teeth only affecting the permanent dentition of the lower jaw. Mandibular second premolar is the most common impacted tooth after the thirdmolars and maxillary canines. Distal migration of the second premolar is rare and early loss of the permanent first molar is one of the most important predisposing factors of intrabony migration of this tooth. Bilateral migration of the mandibular premolars is veryrare compared to unilateral migration. Hereby, we present an 18-year-old man with bilateral intrabony migration of the mandibular second premolars to the mandibular angle (at the inferior and buccal side of the mandibular canal in the presence of first molars. Thepatient also had nine congenitally missing teeth without any systemic complication or abnormality in the skeleton. The teeth were surgically extracted. The clinical and diagnostic features and treatment of this case are discussed.

  7. Determination of working length for teeth with wide or immature apices: a review.

    Science.gov (United States)

    Kim, Y J A; Chandler, N P

    2013-06-01

    Practitioners face several challenges during the root canal treatment of teeth with wide or immature apices, one of which is working length determination. There is relatively little data regarding the value of radiography and electronic apex locator (EAL) use when root formation is incomplete, and supplementary measurement techniques may be helpful. This review considers length determination for canals with wide or completely open apices in permanent and primary teeth. The Ovid Medline, Web of Science and Scopus databases were searched individually and in combinations to August 2012 using the subject headings 'working length determination' and 'open apex' and revealed only one article. Further headings, 'tooth apex', 'apical constriction', 'resorption', 'foramen size', 'mature root apex', 'immature root apex', 'working length determination', 'apexification', 'open apices', 'open apex', 'open apical foramina', 'canal length determination', 'immature teeth', 'apical diameters', 'electronic apex locators', 'primary teeth', 'treatment outcome' and 'clinical outcome' were entered. Potentially useful articles were chosen for a manual search of bibliography as well as a forward search of citations. Other investigations revealed case reports and some research related to open apices and laboratory studies evaluating EALs, radiography and tactile methods. Some involved permanent teeth of various apical diameters and primary teeth with and without resorption. There is a need to define the term 'open apex'. Clinicians should be aware of the benefits and limitations of all canal measuring techniques involved in managing this problem.

  8. Multidisciplinary management of impacted central incisors due to supernumerary teeth and an associated dentigerous cyst

    Directory of Open Access Journals (Sweden)

    Ritesh R Kalaskar

    2011-01-01

    Full Text Available Supernumerary teeth are the most common developmental dental anomaly resulting from hyperactivity of dental lamina, dichotomy, environmental factor, or polygenetic process of atavism. Supernumerary teeth present classical oral complication such as impaction of adjacent teeth, crowding, diastema formation, rotation, displacement of teeth, and occlusal interference. A dentigerous cyst associated with anterior supernumerary teeth (mesiodens is rare and accounts for 5% of all dentigerous cysts. The present case reports describe the successful management of the impacted permanent maxillary central incisor positioned high in the vestibule. A combination of surgical and orthodontic techniques was employed to improve treatment outcome with greater hard and soft tissue preservation and to prevent psychological problems. In the surgical phase, supernumerary teeth and dentigerous cyst were removed. Subsequently traction was employed by bonding bracket on the labial surface using closed and open eruption techniques. Successively, fixed orthodontic treatment was started to align permanent maxillary central incisors in an occlusal plane. Thus, combination of surgical and orthodontic method can be the treatment of choice over surgical extraction, implant placement, and surgical repositioning.

  9. Multidisciplinary management of impacted central incisors due to supernumerary teeth and an associated dentigerous cyst

    Science.gov (United States)

    Kalaskar, Ritesh R.; Kalaskar, Ashita R.

    2011-01-01

    Supernumerary teeth are the most common developmental dental anomaly resulting from hyperactivity of dental lamina, dichotomy, environmental factor, or polygenetic process of atavism. Supernumerary teeth present classical oral complication such as impaction of adjacent teeth, crowding, diastema formation, rotation, displacement of teeth, and occlusal interference. A dentigerous cyst associated with anterior supernumerary teeth (mesiodens) is rare and accounts for 5% of all dentigerous cysts. The present case reports describe the successful management of the impacted permanent maxillary central incisor positioned high in the vestibule. A combination of surgical and orthodontic techniques was employed to improve treatment outcome with greater hard and soft tissue preservation and to prevent psychological problems. In the surgical phase, supernumerary teeth and dentigerous cyst were removed. Subsequently traction was employed by bonding bracket on the labial surface using closed and open eruption techniques. Successively, fixed orthodontic treatment was started to align permanent maxillary central incisors in an occlusal plane. Thus, combination of surgical and orthodontic method can be the treatment of choice over surgical extraction, implant placement, and surgical repositioning. PMID:22114457

  10. Performance comparison of three-phase flux reversal permanent magnet motors in BLDC and BLAC operation mode

    Science.gov (United States)

    Štumberger, B.; Štumberger, G.; Hadžiselimović, M.; Hamler, A.; Goričan, V.; Jesenik, M.; Trlep, M.

    The paper presents a comparison of torque capability and flux-weakening performance of three-phase flux reversal permanent magnet motors with surface and inset permanent magnets. Finite element analysis is employed to determine the performance of each motor in BLDC and BLAC operation mode. It is shown that the torque capability and flux-weakening performance of surface or inset permanent magnet configuration is strongly dependent on the stator teeth number/rotor pole number combination.

  11. Performance comparison of three-phase flux reversal permanent magnet motors in BLDC and BLAC operation mode

    Energy Technology Data Exchange (ETDEWEB)

    Stumberger, B. [Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova ulica 17, Maribor SI-2000 (Slovenia)], E-mail: bojan.stumberger@uni-mb.si; Stumberger, G.; Hadziselimovic, M.; Hamler, A.; Gorican, V.; Jesenik, M.; Trlep, M. [Faculty of Electrical Engineering and Computer Science, University of Maribor, Smetanova ulica 17, Maribor SI-2000 (Slovenia)

    2008-10-15

    The paper presents a comparison of torque capability and flux-weakening performance of three-phase flux reversal permanent magnet motors with surface and inset permanent magnets. Finite element analysis is employed to determine the performance of each motor in BLDC and BLAC operation mode. It is shown that the torque capability and flux-weakening performance of surface or inset permanent magnet configuration is strongly dependent on the stator teeth number/rotor pole number combination.

  12. Idiopathic odontoma formation following avulsion of immature permanent incisors: two case reports.

    Science.gov (United States)

    Motokawa, W; Braham, R L; Taniguchi, K

    1990-01-01

    From the findings of Case 1 and those cases reviewed in the literature it would appear that overfilling a canal with gutta percha prevents continued root formation after reimplantation of the tooth. The canal should be underfilled, therefore, if gutta percha is used as the obturating medium. Consequently, the authors recommend that calcium hydroxide be used as the root canal filling material of choice after reimplanting immature permanent teeth subsequent to traumatic avulsion. Since, however, calcium hydroxide paste tends to be resorbed, periodic refilling of the canal with the paste is required. Case 2 emphasizes the importance of periodic postoperative radiographic evaluation for several years after traumatic avulsion of immature permanent teeth.

  13. Vital pulp therapy in symptomatic immature permanent molars: Report of 3 cases

    Directory of Open Access Journals (Sweden)

    SheikhRezaie MS.

    2009-11-01

    Full Text Available "nEndodontic treatment of immature permanent teeth accompanies with several issues. The primary goal when treating such teeth is to maintain pulp vitality so that root development can occur normally. Indications and requirements for vital pulp therapy include asymptomatic and reversible pulpitis. Also there are controversial opinions regarding the ultimate clinical treatment of the vital pulp therapy techniques. In this manuscript we report 3 cases of immature symptomatic permanent molars with irreversible pulpitis caused by caries exposure of the pulp that have been undergone vital pulp therapy successfully.

  14. INVESTIGATION OF IMPACTED SUPERNUMERARY TEETH: A CONE BEAM COMPUTED TOMOGRAPH (CBCT STUDY

    Directory of Open Access Journals (Sweden)

    Gökhan GÜRLER

    2017-10-01

    Full Text Available Purpose: The purpose of this study was to investigate the impacted supernumerary teeth which were initially detected on panoramic radiographs by using cone beam computed tomography (CBCT. Materials and Methods: In this retrospective study, supernumerary teeth diagnosed on panoramic radiographs taken from patients who had admitted for routine dental treatment were evaluated using CBCT. Patients’ age, gender, systemic conditions as well as number of supernumerary teeth, unilateral-bilateral presence, anatomical localization (maxilla, mandible, anterior-premolar-molar, mesiodens-lateral-canine, parapremolar-paramolar-distomolar shape (rudimentary, supplemental, tuberculate, odontoma, position (palatal-lingual-buccal-labial-central, shortest distance between the tooth and adjacent cortical plate, complications and treatment were assessed. Results: A total of 47 impacted supernumerary teeth in 34 patients were investigated in this study. Of these, 33 (70.2% were unilateral and 14 (29.8% were bilateral. Only 1 supernumerary tooth was found in 27 patients (79.4% whereas 7 patients (20.6% had 2 or more supernumerary teeth. Most of the teeth located in the anterior region (74.4% of the jaws and maxilla (74.4%. Twenty teeth (42.5% were mesiodens, 11 (23.4% were lateral or canine, 14 (29.7% were parapremolar and 2(4.4% were distomolar. Twenty-seven teeth (57.4% were rudimentary, 15 (31.9% were supplemental and 5 (10.7% were odontoma in shape. The shortest distance between the supernumerary tooth and adjacent cortical plate varied between 0 to 2.5 mm with a mean of 0.66 mm. The most common clinical complaint was the non-eruption of permanent teeth (42.5%. All supernumerary teeth were removed under local anesthesia. Orthodontic traction was performed for those impacted permanent teeth if necessary. Conclusion: Impacted supernumerary teeth are usually in close proximity to cortical bone. Although this may facilitate surgical access, there is a risk of

  15. Regenerative endodontic treatment of an immature permanent canine following infant oral mutilation.

    Science.gov (United States)

    Noy, Avia Fux; Nuni, Eyal; Moskovitz, Moti

    2013-01-01

    Extracting primary canine tooth buds is a ritual ceremony that prevails in some African countries. This procedure is considered infant oral mutilation (IOM) and may damage the permanent successor and adjacent primary and permanent teeth, resulting in dysplastic or deformed teeth. The purpose of this report was to describe regenerative endodontic treatment of a permanent mandibular canine with extensive coronal hypoplasia, immature root, and a periapical radiolucency following damage to the permanent canine that was probably a result of infant oral mutilation. Regenerative endodontic treatment was initiated by irrigating the root canal, followed by applying triple antibiotic paste dressing over three weeks and creating a blood clot scaffold covered with mineral trioxide aggregate. A 4-year clinical and radiographic follow-up demonstrated healing of the periapical radiolucency. This treatment may serve as a substitute for traditional apexification with calcium hydroxide or creation of an artificial apical barrier with mineral trioxide aggregate.

  16. Treatment of "non-restorable" teeth. A case report.

    Science.gov (United States)

    Donly, K J

    1991-08-01

    The purpose of this article is to present a case report of the dental care for permanent teeth that were originally considered "non-restorable". The temporary placement of stainless steel crowns was completed, followed by traditional endodontic therapy. The crowns were used as build-up matrices, access being prepared in the occlusal of the crown. Glass ionomer silver was then placed, followed by marginal finishing. Although this report is an isolated case, and is considered as temporary treatment, there may be indications to consider this technique for clinical care, on an individual basis.

  17. Forensic study of sex determination using PCR on teeth samples.

    OpenAIRE

    Murakami H; Yamamoto Y; Yoshitome K; Ono T; Okamoto O; Shigeta Y; Doi Y; Miyaishi S; Ishizu H

    2000-01-01

    In this study, sex determination using polymerase chain reaction (PCR) on tooth material was evaluated from the viewpoint of forensic medicine. The sensitivity of PCR for detection of the Y chromosome-specific alphoid repeat sequence and the X chromosome-specific alphoid repeat sequence was 0.5 pg of genomic DNA. Sex could be determined by PCR of DNA extracted from the pulp of 16 freshly extracted permanent teeth and dentine including the surface of the pulp cavity of 6 freshly extracted milk...

  18. Prevalence of malocclusion in relation to premature loss of primary teeth.

    Science.gov (United States)

    Pedersen, J; Stensgaard, K; Melsen, B

    1978-07-01

    The influence of premature extraction of primary teeth. The influence of the site of extraction was analyzed by studying the frequency of malocclusion in the group of children with extraction in the mandible or maxilla only. It was found that early loss of primary teeth would result in an increased frequency of sagittal, vertical as well as transversal malocclusion. As a consequence the need for treatment would increase significantly by early extraction of primary teeth. Whereas extraction in the maxilla would tend to result in need for extraction of permanent teeth; extraction in the mandible would often lead to need for orthodontic treatment of longer duration. On the basis of these findings it could be concluded that maintaining a high standard of dental service for preschool children must be considered good economy, since the need for premature extractions is reduced.

  19. Materials for Paediatric Dentistry. Part 1: Background to the Treatment of Carious Primary Teeth.

    Science.gov (United States)

    Jenkins, Natalie

    2015-12-01

    Dental caries is a disease that affects many people, including children, and presents numerous challenges to healthcare providers. As clinicians it is important that we consider the advantages and disadvantages of treating carious primary teeth, and make an informed decision about when it is appropriate or not. This paper describes the background to the treatment of carious primary teeth, looking at the differences between primary and permanent teeth, and the relevance of this. It also suggests points to consider when looking at restoration survival studies, as the ability to appraise the literature critically is important for us all in this 'evidence-based' age. CPD/Clinical Relevance: Our early life experiences have the ability to shape our future attitudes and behaviour. Children with carious teeth require careful management so that pain and suffering is minimized, and positive attitudes towards dentistry are fostered.

  20. Restoration of endodontically treated anterior teeth: an evaluation of coronal microleakage of glass ionomer and composite resin materials.

    Science.gov (United States)

    Diaz-Arnold, A M; Wilcox, L R

    1990-12-01

    A glass ionomer material was evaluated for coronal microleakage in permanent lingual access restorations of endodontically treated anterior teeth. The material was tested as a restoration, placed over a zinc oxide-eugenol base, and as a base with an acid-etched composite resin veneer and a dentinal bonding agent. Restored teeth were thermocycled, immersed in silver nitrate, developed, and sectioned to assess microleakage. Significant coronal leakage was observed with all materials used.

  1. First permanent molar root development arrest associated with compound odontoma.

    Science.gov (United States)

    Gunda, Sachin A; Patil, Anil; Varekar, Aniruddha

    2013-07-04

    Trauma or infection to the primary tooth may have deleterious effects on the underlying developing tooth buds. Anatomically the root apices of primary teeth are in close proximity to the developing permanent tooth buds; hence spread of infection originating from pulp necrosis of primary tooth may not only affect the underlying tooth bud but may also affect the adjacent tooth buds. The extent of malformation depends on the developmental stage of tooth or the age of patient. Presented here is a rare case of complete arrest of maxillary first permanent molar root growth due to spread of periapical infection originating from second primary molar leading to failure of its eruption and finally extraction. Histopathlogical analysis revealed compound odontoma associated with maxillary first permanent molar.

  2. Bayes reconstruction of missing teeth

    DEFF Research Database (Denmark)

    Sporring, Jon; Jensen, Katrine Hommelhoff

    2008-01-01

     We propose a method for restoring the surface of tooth crowns in a 3D model of a human denture, so that the pose and anatomical features of the tooth will work well for chewing. This is achieved by including information about the position and anatomy of the other teeth in the mouth. Our system...... contains two major parts: A statistical model of a selection of tooth shapes and a reconstruction of missing data. We use a training set consisting of 3D scans of dental cast models obtained with a laser scanner, and we have build a model of the shape variability of the teeth, their neighbors...... regularization of the log-likelihood estimate based on differential geometrical properties of teeth surfaces, and we show general conditions under which this may be considered a Bayes prior.Finally we use Bayes method to propose the reconstruction of missing data, for e.g. finding the most probable shape...

  3. New perspectives about molecular arrangement of primary and permanent dentin

    Energy Technology Data Exchange (ETDEWEB)

    Sanches Borges, Ana Flavia [Department of Dental Materials at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil); Andrade Bitar, Renata [Biomedical Engineering, Valley of Paraiba University (UNIVAP) (Brazil); Kantovitz, Kamila Rosamilia [Department of Pediatric Dentistry at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil); Bortollazo Correr, Americo [Department of Dental Materials at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil); Martin, Airton Abrahao [Biomedical Engineering Post Graduation, Valley of Paraiba University (UNIVAP) (Brazil); Puppin-Rontani, Regina Maria [Department of Pediatric Dentistry at Piracicaba Dental School, State University of Campinas, Piracicaba, SP (Brazil)], E-mail: rmpuppin@fop.unicamp.br

    2007-12-30

    The dentin quality of primary and permanent teeth was inspected by Fourier transformed Raman spectroscopy (FT-Raman); scanning electron microscopy/energy-dispersive spectroscopy (SEM/EDS) and hardness test. Middle dentin of crowns were reached by carbide bur abrading providing a uniform smear layer. Phosphoric acid was applied in order to simulate the etching of total etching adhesive systems. The groups were (n = 10): G1 (primary dentin smear layer); G2 (35% phosphoric acid etched primary dentin); G3 (permanent dentin smear layer); G4 (35% phosphoric acid etched permanent dentin). FT-Raman results were subjected to cluster analysis. SEM/EDS were made in order to add the data obtained by FT-Raman. The hardness data were subjected to ANOVA and Tukey test. FT-Raman showed differences among groups, either to organic or inorganic content. For the organic content, primary and permanent dentin became similar after the etching; conversely, the inorganic content showed differences for the two substrates. Hardness test showed no significant differences between primary and permanent dentin, before or after etching, but the etching decreased these values. The mineral content arrangement of primary dentin is different from permanent dentin, independently of the etching. The substrate type did no influence the hardness, but the etching decreased it.

  4. Endodontic management of taurodontic teeth

    Directory of Open Access Journals (Sweden)

    Prakash R

    2005-01-01

    Full Text Available Taurodontism is a morpho-anatomical change in the shape of the tooth in which the body of the tooth is enlarged and the roots are reduced in size. Although taurodontism is a dental rarity, this unusual radicular form should merit circumspect considerations in planning and treatment. Endodontic management in taurodont teeth has been described as complex and difficult. The present paper describes the successful completion of endodontic treatment in three taurodontic teeth with appropriate use of instruments and techniques and also emphasizes the need for post endodontic rehabilitation.

  5. Elemental Analysis of Asian Elephant (Elephas maximus) Teeth Using X-ray Fluorescence and a Comparison to Other Species.

    Science.gov (United States)

    Nganvongpanit, Korakot; Brown, Janine L; Buddhachat, Kittisak; Somgird, Chaleamchat; Thitaram, Chatchote

    2016-03-01

    Elemental composition in bone of the different species has variation depending on genetic and environmental factors especially their food habitat. The aims of this study were to conduct an elemental analysis of Asian elephant teeth, both deciduous (first molar, second molar, and tusk) and permanent (molar and tusk), and compare the elemental composition of permanent teeth among 15 species, mostly mammalian. These teeth were analyzed using X-ray fluorescence at two voltages: 15 and 50 kV. In Asian elephants, deciduous tusk showed a lower Ca/Zn ratio compared to permanent tusk, because of the lack of Zn in permanent molars. Ca/Fe ratio was higher in deciduous than permanent molars. For permanent teeth, elephant molars presented a high Ca/Pb ratio but no Ca/Zn, Ca/Sr, and Zn/Fe ratios because of the lack of Zn and Sr in the samples tested. The key elemental ratios for differentiating elephant deciduous and permanent tusk were Ca/P and Ca/Zn. The considerable variation in elemental ratio data across 15 species was observed. All tooth samples contained Ca and P, which was not surprising; however, Pb also was present in all samples and Cd in a large majority, suggesting exposure to environmental contaminants. From discriminant analysis, the combination of Ca/P+Ca/Zn+Ca/Pb+Ca/Fe+Ca/Sr+Zn/Fe can generate two equations that successfully classified six (dog, pig, goat, tapir, monkey, and elephant) out of 15 species at 100 % specificity. In conclusion, determining the elemental profile of teeth may serve as a tool to identify the tooth "type" of elephants and to potentially classify other species.

  6. Prevalence of prematurely lost primary teeth in 5–10-year-old children in Thamar city, Yemen: A cross-sectional study

    OpenAIRE

    Murshid, Sakhr A.; Al-Labani, Mohammed A.; Aldhorae, Khalid A.; Rodis, Omar M. M.

    2016-01-01

    Objectives: The premature loss of primary teeth is a potential risk factor for poor arch length development. Adequate arch length is important to the progression of the permanent teeth. Poor arch length can lead to crowding, ectopic eruption, or impaction of these teeth. This study is designed to assess the prevalence of premature loss of primary teeth in the 5-10-year-old age group. Materials and Methods: The study group included 185 children, that is, 91 boys and 94 girls. The dental examin...

  7. Esthetic and endodontic management of fused maxillary lateral incisor and supernumerary teeth with all ceramic restoration after trauma

    Directory of Open Access Journals (Sweden)

    Kiranmeet Kaur Khurana

    2014-01-01

    Full Text Available Double or fusion of the teeth is a primary developmental anomaly union of two independently developing primary or permanent teeth. The tooth fusion may contribute to various significant problems such as crowding, caries and periodontal diseases. Fused teeth require an interdisciplinary approach combining the endodontic, esthetic and prosthetic treatments. All ceramic restoration meets the requirement of better appearance, biocompatibility and long life. By using restorative therapy esthetic and functional criteria were satisfied. Management of a case of fusion of a maxillary lateral incisor and a supernumerary tooth is presented.

  8. Permanent magnet design methodology

    Science.gov (United States)

    Leupold, Herbert A.

    1991-01-01

    Design techniques developed for the exploitation of high energy magnetically rigid materials such as Sm-Co and Nd-Fe-B have resulted in a revolution in kind rather than in degree in the design of a variety of electron guidance structures for ballistic and aerospace applications. Salient examples are listed. Several prototype models were developed. These structures are discussed in some detail: permanent magnet solenoids, transverse field sources, periodic structures, and very high field structures.

  9. Lawful Permanent Residents - Annual Report

    Data.gov (United States)

    Department of Homeland Security — A lawful permanent resident (LPR) or 'green card' recipient is defined by immigration law as a person who has been granted lawful permanent residence in the United...

  10. Scorching effects of heat on extracted teeth - A forensic view

    Directory of Open Access Journals (Sweden)

    Ajay P Prakash

    2014-01-01

    Full Text Available Context: Fire investigation is the multidisciplinary basis of the exploration, which involves investigations concerning the origin of fire, its cause as well as the identification of victims. At times, victim identification in fire disasters becomes nearly impossible owing to complete destruction of soft tissues. In such circumstances, teeth may prove to be of value since they are extremely hard. A precise understanding of physical and histological changes in teeth subjected to high temperature can provide valuable clues in fire and crime investigations, when dental evidence remains. Aim: The main aim and objective of the study was to investigate structural damage in freshly extracted teeth to heating, at different temperatures for a certain length of time in the laboratory. Settings and Design: Fifty-four freshly extracted teeth of different age groups had been subjected to different temperatures for a period of 15 minutes in the laboratory furnace. Physical and microscopic findings were correlated to the temperature. Materials and Methods: Freshly extracted 54 permanent teeth of different age groups were collected and were subjected to temperatures of 100°C, 300°C, and 600°C. Teeth were then examined for any physical changes such as change in color, texture, or morphology that occurred. Then the teeth were subjected for decalcification following which the tissues were kept for routine processing and were embedded in paraffin wax. Sections of 4 μm thickness were made and stained in hematoxylin and eosin (H and E to correlate the microscopic findings to the temperature. Statistical Analysis: Physical and microscopic findings were correlated to the temperature. Results: Microscopic examination revealed definite histological patterns, which were explicitly seen at a particular temperature. The samples showed cracks and charring of the tooth structure with microscopic findings such as widening of dentinal tubules and altered histological

  11. The histological effects of composite resin materials on the pulps of monkey teeth.

    Science.gov (United States)

    Heys, R J; Heys, D R; Cox, C F; Avery, J K

    1977-03-01

    Pulpal response of three bis glycol methacrylate composite resins, Smile, Simulate and Experimental Composite no. 2 were tested on primary and permanent monkey teeth using zinc oxide eugenol (ZOE) and silicate as controls. All materials were placed in Class V cavity preparations in Rhesus monkey teeth and evaluated at 3 days and 5 and 8 weeks. The materials were randomly placed in anterior and posterior teeth utilizing 75 primary and 75 permanent teeth. Following perfusion the teeth were prepared by routine histological procedures. The 3 day response of the composite resins was moderate, characterized by disruption of the odontoblasts, vacuolization and mild inflammatory response underlying the cavity. At 5 weeks the formation of reparative dentin and a decrease in the inflammatory response was similar for all resins observed. At 8 weeks a slight increase in reparative dentin and continued decrease in inflammation was noted when compared to the 5 weeks responses. At all time intervals ZOE produced the least pulpal response while silicate produced the most severe response.

  12. 77 FR 20319 - Bovine Spongiform Encephalopathy; Importation of Bovines and Bovine Products

    Science.gov (United States)

    2012-04-04

    ...; ] DEPARTMENT OF AGRICULTURE Animal and Plant Health Inspection Service 9 CFR Part 93 RIN 0579-AC68 Bovine Spongiform Encephalopathy; Importation of Bovines and Bovine Products Correction In proposed rule...

  13. 78 FR 73993 - Bovine Spongiform Encephalopathy; Importation of Bovines and Bovine Products

    Science.gov (United States)

    2013-12-10

    ... Health Inspection Service 9 CFR Parts 92, 93, 94, 95, 96, and 98 RIN 0579-AC68 Bovine Spongiform Encephalopathy; Importation of Bovines and Bovine Products Corrections In rule document 2013-28228 appearing...

  14. Effectiveness of single-surface ART restorations in the permanent dentition: a meta-analysis.

    NARCIS (Netherlands)

    Frencken, J.E.F.M.; Hof, M.A. van 't; Amerongen, W.E. van; Holmgren, C.J.

    2004-01-01

    Over the past few years, there has been an increase in the number of studies reporting on various aspects of the Atraumatic Restorative Treatment (ART) approach. Five randomized clinical trials in which ART restorations with glass ionomers were compared with amalgam restorations in permanent teeth f

  15. Multiple Pulp Stones in Primary and Developing Permanent Dentition: A Report of 4 Cases

    Directory of Open Access Journals (Sweden)

    Mohita Marwaha

    2012-01-01

    Full Text Available Pulp stones are foci of calcification or discrete calcifications in the dental pulp. They are frequently found on bitewing and periapical radiographs, but their occurrence in entire dentition is unusual. We are reporting four cases in which the occurrence of pulp stones ranged from their presence in just primary teeth (Cases 1 and 2 to involvement of young permanent teeth also (Case 3 and even unerupted permanent teeth (Case 4. In all the cases, dental, medical, and family histories as well as the findings from the clinical examination of the patient were not contributory. Histopathological report revealed true denticle. Metabolic evaluation of patients through liver function test, kidney function test, and blood investigation did not show any metabolic disorders. Patients were also evaluated for any systemic, syndromic, or genetic involvement, but this was also noncontributing. Therefore, it is suggested that these unusual cases may be of idiopathic origin.

  16. Flouride. Ten-year prospective study of deciduous and permanent dentition.

    Science.gov (United States)

    Margolis, F J; Reames, H R; Freshman, E; MaCauley, C D; Mehaffey, H

    1975-07-01

    A ten-year longitudinal prospective study compared the effect of fluoride on dentition of 1,500 children from infancy through age 10 years. In Kalamazoo, Mich, and Oneida, NY, parallel groups were given a fluoride-vitamin supplement from infancy and from age 4 and compared with fluoridated water and control groups. Incidence of new caries activity in both deciduous and permanent teeth was measured by mean number of new decayed and filled teeth, as well as percentage of children with no caries throughout the periods studied. Prevalence of caries was also studied in six-year molars. The results indicate a consistent (and, for selected groups, a statistically significant) diminution in caries activity for both deciduous and permanent teeth for groups ranked from greatest retardation of caries to least: infant fluoride group, water fluoride group, age 4 fluoride group, and controls.

  17. "Early baby teeth": Folklore and facts.

    Science.gov (United States)

    Maheswari, N Uma; Kumar, B P; Karunakaran; Kumaran, S Thanga

    2012-08-01

    Variations in the newborns' oral cavity have been an enduring interest to the pediatric dentist. The occurrence of natal and neonatal teeth is a rare anomaly, which for centuries has been associated with diverse superstitions among many different ethnic groups. Natal teeth are more frequent than neonatal teeth, the ratio being approximately 3:1. The purpose of this case report is to review the literature related to the natal teeth folklore and misconceptions and discuss their possible etiology and treatment.

  18. Over two hundred million injuries to anterior teeth attributable to large overjet: a meta-analysis.

    Science.gov (United States)

    Petti, Stefano

    2015-02-01

    The association between large overjet and traumatic dental injuries (TDIs) to anterior teeth is documented. However, observational studies are discrepant and generalizability (i.e. external validity) of meta-analyses is limited. Therefore, this meta-analysis sought to reconcile such discrepancies seeking to provide reliable risk estimates which could be generalizable at global level. Literature search (years 1990-2014) was performed (Scopus, GOOGLE Scholar, Medline). Selected primary studies were divided into subsets: 'primary teeth, overjet threshold 3-4 mm' (Primary3); 'permanent teeth, overjet threshold 3-4 mm' (Permanent3); 'permanent teeth, overjet threshold 6 ± 1 mm' (Permanent6). The adjusted odds ratios (ORs) were extracted. To obtain the highest level of reliability (i.e. internal validity), the pooled OR estimates were assessed accounting for between-study heterogeneity, publication bias and confounding. Result robustness was investigated with sensitivity and subgroup analyses. Fifty-four primary studies from Africa, America, Asia and Europe were included. The sampled individuals were children, adolescents and adults. Overall, there were >10 000 patients with TDI. The pooled OR estimates resulted 2.31 (95% confidence interval - 95CI, 1.01-5.27), 2.01 (95CI, 1.39-2.91) and 2.24 (95CI, 1.56-3.21) for Primary3, Permanent3 and Permant6, respectively. Sensitivity and subgroup analyses corroborated these estimates. Reliability and generalizability of pooled ORs were high enough and made it possible to assess that the fraction of global TDIs attributable to large overjet is 21.8% (95CI, 9.7-34.5%) and that large overjet is co-responsible for 235 008 000 global TDI cases (95CI, 104,760,000-372,168,000). This high global burden of TDI suggests that preventive measures must be implemented in patients with large overjet. © 2014 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.

  19. Metal-ceramic dowel crown restorations for severely damaged teeth: A clinical report

    Directory of Open Access Journals (Sweden)

    Yuzugullu Bulem

    2009-01-01

    Full Text Available This clinical report describes an alternative prosthodontic treatment of a patient who had severely damaged endodontically-treated first molar teeth in all quadrants of her mouth. The young patient′s severely damaged permanent molar teeth were treated with a restoration combining the advantage of the esthetics of dental porcelain, reinforced with the underlying cast gold dowel crown. Using this technique, the remaining sound tooth structure was preserved with function and esthetics accomplished. The described metal-ceramic one piece dowel crown restoration seemed to perform without any problems for the 12 month evaluation time.

  20. Unlocking the bovine genome

    Directory of Open Access Journals (Sweden)

    Worley Kim C

    2009-04-01

    Full Text Available Abstract The draft genome sequence of cattle (Bos taurus has now been analyzed by the Bovine Genome Sequencing and Analysis Consortium and the Bovine HapMap Consortium, which together represent an extensive collaboration involving more than 300 scientists from 25 different countries.

  1. Significance of proper oral hygiene for health condition of mouth and teeth

    Directory of Open Access Journals (Sweden)

    Ljaljević Agima

    2012-01-01

    Full Text Available Background/Aim. Proper mouth and teeth hygiene has influence on the prevention of a great number of diseases and very often some of them are not related only to oral cavity. Most frequent diseases of mouth and teeth such as caries and periodontal diseases are caused, among other factors, by poor oral hygiene. They are also more frequent in young population. The aim of this study was to estimate the influence of sociodemographic characteristics and hygienic habit on oral health in children aged 11-15 years. Methods. This crosssectional study was conducted by the dental teams in dentist surgeries in Tivat Health Center between May and September 2009. The sample consisted of patients 11 to 15 years of age. A questionnaire and dental examination of mouth and teeth were used as research instruments. The examinations were conducted in accordance with the World Health Organization methodology and criteria. The data obtained from the interviews were correlated with those obtained from the clinical examinations. Results. The results show that the majority of respondents brush their teeth twice a day and visit the dentist once in every six months. The research also shows that 57% respondents have caries of deciduous teeth and over 63% respondents of permanent teeth. Gingivitis was found in 14% and orthodontic anomalies in 44.7% respondents. A half of respondents who brush their teeth rarely have problems with gingivitis. There is a highly statistically significant difference between the occurrence of gingivitis and the frequency of teeth brushing. Conclusion. There is a significant difference between mouth and oral hygiene and sex as well as other sociodemographic characteristics of respondents. The study showed the correlation between occurrence of caries and the gingivitis and frequency of teeth brushing and dental visits.

  2. Analysis of colored teeth from Precolumbian Tlatelolco: postmortem transformation or intravitam processes?

    Science.gov (United States)

    Mansilla, J; Solis, C; Chávez-Lomeli, M E; Gama, J E

    2003-01-01

    The etiological basis of the abnormal coloration of archaeological teeth has been an unsolved question for a long time. Differences in the appearance of some archaeological teeth from Precolumbian adult and infant skeletons, detected by external optical inspection, led us to study this problem. A blue stain is visible in a few of the deciduous erupted teeth, and a brown color in various unerupted teeth in the collection, while brown spots appear on some permanent teeth. Several processes or factors that may occur during one's life, others around the time of death, and still others resulting from postmortem alterations have been reported as potential causes of abnormal tooth coloration.A sample of 35 colored teeth and two soil layers taken from Tlatelolco were analyzed by particle-induced X-ray emission (PIXE) as well as selective dissolution techniques. Concentrations of total and extractable elements in enamel and soil layers (Cg1-Cg2) were obtained. This paper describes the occurrence and implications of a substantial secondary concentration of Zinc (Zn), manganese (Mn), strontium (Sr), and iron (Fe) in the deciduous erupted and nonerupted teeth as compared to that in the adult teeth. Our interpretation is that, in this archaeological context, the brown spots and blue stains on the teeth are due to differences in tooth enamel porosity and to a postmortem biogeochemical process. The alterations involve cumulization and diagenesis of iron, manganese, and organic matter solutions that were eluviated from the soil and are not the result of antemortem or perimortem conditions such as trauma or disease.

  3. Camel and bovine chymosin

    DEFF Research Database (Denmark)

    Langholm Jensen, Jesper; Mølgaard, Anne; Navarro Poulsen, Jens Christian;

    2013-01-01

    Bovine and camel chymosin are aspartic peptidases that are used industrially in cheese production. They cleave the Phe105-Met106 bond of the milk protein κ-casein, releasing its predominantly negatively charged C-terminus, which leads to the separation of the milk into curds and whey. Despite...... having 85% sequence identity, camel chymosin shows a 70% higher milk-clotting activity than bovine chymosin towards bovine milk. The activities, structures, thermal stabilities and glycosylation patterns of bovine and camel chymosin obtained by fermentation in Aspergillus niger have been examined...... interactions arising from variation in the surface charges and the greater malleability both in domain movements and substrate binding contribute to the better milk-clotting activity of camel chymosin towards bovine milk....

  4. Permanence can be Defended.

    Science.gov (United States)

    McGee, Andrew; Gardiner, Dale

    2017-03-01

    In donation after the circulatory-respiratory determination of death (DCDD), the dead donor rule requires that the donor be dead before organ procurement can proceed. Under the relevant limb of the Uniform Determination of Death Act 1981 (USA), a person is dead when the cessation of circulatory-respiratory function is 'irreversible'. Critics of current practice in DCDD have argued that the donor is not dead at the time organs are procured, and so the procurement of organs from these donors violates the dead donor rule. We offer a new argument here in defence of current DCDD practice, and, in particular, of the interpretation of the requirement of 'irreversibility' as permanence.

  5. Pulsars: Cosmic Permanent 'Neutromagnets'?

    CERN Document Server

    Hansson, Johan

    2011-01-01

    We argue that pulsars may be spin-polarized neutron stars, i.e. cosmic permanent magnets. This would simply explain several observational facts about pulsars, including the 'beacon effect' itself i.e. the static/stable misalignment of rotational and magnetic axes, the extreme temporal stability of the pulses and the existence of an upper limit for the magnetic field strength - coinciding with the one observed in "magnetars". Although our model admittedly is speculative, this latter fact seems to us unlikely to be pure coincidence.

  6. Effect of gamma radiation and endodontic treatment on mechanical properties of human and bovine root dentin

    Energy Technology Data Exchange (ETDEWEB)

    Novais, Veridiana Resende; Soares, Priscilla Barbosa Ferreira; Guimaraes, Carlla Martins; Schliebe, Lais Rani Sales Oliveira; Braga, Stella Sueli Lourenco; Soares, Carlos Jose, E-mail: carlosjsoares@ufu.br [Universidade Federal de Uberlandia (UFU), MG (Brazil)

    2016-11-15

    This study evaluated the effect of gamma radiation and endodontic treatment on the microhardness and flexural strength of human and bovine root dentin. Forty single rooted human teeth and forty bovine incisor teeth were collected, cleaned and stored in distilled water at 4 °C. The human and bovine teeth were divided into 4 groups (n=10) resulting from the combination of two study factors: first, regarding the endodontic treatment in 2 levels: with or without endodontic treatment; and second, radiotherapy in two levels: with or without radiotherapy by 60 Gy of Co-60 gamma radiation fractioned into 2 Gy daily doses five days per week. Each tooth was longitudinally sectioned in two parts; one-half was used for the three-point bending test and the other for the Knoop hardness test (KHN). Data were analyzed by 3-way ANOVA and Tukey HSD test (α=0.05). No significant difference was found for flexural strength values. The human dentin had significantly higher KHN than the bovine. The endodontic treatment and radiotherapy resulted in significantly lower KHN irrespective of tooth origin. The results indicated that the radiotherapy had deleterious effects on the microhardness of human and bovine dentin and this effect is increased by the interaction with endodontic therapy. The endodontic treatment adds additional negative effect on the mechanical properties of radiated tooth dentin; the restorative protocols should be designed taking into account this effect. (author)

  7. Prevalence of prematurely lost primary teeth in 5–10-year-old children in Thamar city, Yemen: A cross-sectional study

    Science.gov (United States)

    Murshid, Sakhr A.; Al-Labani, Mohammed A.; Aldhorae, Khalid A.; Rodis, Omar M. M.

    2016-01-01

    Objectives: The premature loss of primary teeth is a potential risk factor for poor arch length development. Adequate arch length is important to the progression of the permanent teeth. Poor arch length can lead to crowding, ectopic eruption, or impaction of these teeth. This study is designed to assess the prevalence of premature loss of primary teeth in the 5-10-year-old age group. Materials and Methods: The study group included 185 children, that is, 91 boys and 94 girls. The dental examination was conducted by an experienced examiner under sufficient artificial light. Data including patient age and missing teeth were collected. Descriptive statistics were applied for data analysis, and from the results, Chi-square tests were used at a level of significance of 5% (P space problems associated with the early loss of primary teeth would help in reducing malocclusion problems. PMID:27652244

  8. Vital Pulp Therapy of a Symptomatic Immature Permanent Molar with Long-Term Success

    Science.gov (United States)

    Sabbagh, Sedigheh; Sarraf Shirazi, Alireza; Eghbal, Mohammad Jafar

    2016-01-01

    Vital pulp therapy (VPT) is the preferred conservative treatment for preservation of symptomatic pulps in immature permanent teeth. The present case report summarizes VPT of an immature permanent molar with irreversible pulpitis associated with apical periodontitis in a 9-year-old boy. Cervical pulpotomy was performed and radicular pulp stumps were covered with calcium-enriched mixture (CEM) cement; the tooth was then restored with stainless steel crown. After a 50-month follow-up period, the pulpotomized molar was clinically functional and asymptomatic. Moreover, radiographic evaluation revealed evidence of complete root development as well as normal periodontal ligament around the roots. The successful outcome achieved through VPT using CEM biomaterial in the reported case suggests that this method may produce favorable outcome for vital immature permanent teeth with irreversible pulpitis and periapical disease. PMID:27790270

  9. Etiology, Classification and Management of Ectopic Eruption of Permanent First Molars.

    Science.gov (United States)

    Hsiao, Chu-Chun; Boynton, James R

    2016-01-01

    Ectopic eruption of a permanent tooth involves abnormal resorption of a portion or all of the adjacent primary tooth. Among the most commonly ectopically erupted teeth are the permanent first molars. Ectopically erupting molars may require intervention to allow for full eruption, or they may spontaneously self-correct and erupt into occlusion. Decisions regarding the necessity of intervention, its ideal timing, and intervention type are multifactorial. Treatment options for the ectopically erupting permanent first molar include the elastomeric separator, brass wire, pre-fabricated clip separator, custom made appliances (Humphrey appliance, Halterman appliance), or extraction of the primary molar. Early intervention when indicated can ensure proper full eruption of the permanent first molar and prevent mesial angulation, arch perimeter loss, tooth impaction and ankylosis. Two cases are described that manage ectopic eruption of the permanent first molar.

  10. Bayes reconstruction of missing teeth

    DEFF Research Database (Denmark)

    Sporring, Jon; Jensen, Katrine Hommelhoff

    2008-01-01

     We propose a method for restoring the surface of tooth crowns in a 3D model of a human denture, so that the pose and anatomical features of the tooth will work well for chewing. This is achieved by including information about the position and anatomy of the other teeth in the mouth. Our system...... of a missing tooth based on the best match with our shape model on the known data, and we superior improved reconstructions of our full system....

  11. Delayed replantation of avulsed teeth

    Directory of Open Access Journals (Sweden)

    Adil N

    2007-05-01

    Full Text Available Dental injuries are very common and their extent has been classified by Ellis. Avulsion of tooth is a grievous injury and ranges from 1-16% among the traumatic injuries, of which maxillary anterior are commonest. Reimplantation of avulsed teeth is a standard procedure. However, it has certain limitations. Most often their management is very challenging. In this case report we are presenting the management of maxillary incisors by replantation after 36 hrs in a 12 year old girl.

  12. Iron deposition in modern and archaeological teeth

    Energy Technology Data Exchange (ETDEWEB)

    Williams, A.-M.M., E-mail: AnneMarie.Williams@utas.edu.au [School of Medicine, Private Bag 34, University of Tasmania, Hobart 7001 (Australia); Siegele, R. [Australian Nuclear Science and Technology Organisation, PMB 1, Menai, NSW 2234 (Australia)

    2014-09-15

    Iron surface concentrations and profile maps were measured on the enamel of archaeological and modern teeth to determine how iron is deposited in tooth enamel and if it was affected by the post-mortem environment. Teeth from Australian children who died in the second half of the 19th century were compared with contemporary teeth extracted for orthodontic purposes. Surface analysis of the teeth was performed using the 3 MV Van Der Graff Accelerator at The Australian Nuclear Science and Technology Organisation (ANSTO), Sydney, Australia. A small sample of teeth were then cut in the mid sagittal plane and analysed using ANSTO High Energy Heavy Ion Microprobe. Maps and linear profiles were produced showing the distribution of iron across the enamel. Results show that both the levels and distribution of iron in archaeological teeth is quite different to contemporary teeth, raising the suggestion that iron has been significantly altered by the post-mortem environment.

  13. Iron deposition in modern and archaeological teeth

    Science.gov (United States)

    Williams, A.-M. M.; Siegele, R.

    2014-09-01

    Iron surface concentrations and profile maps were measured on the enamel of archaeological and modern teeth to determine how iron is deposited in tooth enamel and if it was affected by the post-mortem environment. Teeth from Australian children who died in the second half of the 19th century were compared with contemporary teeth extracted for orthodontic purposes. Surface analysis of the teeth was performed using the 3 MV Van Der Graff Accelerator at The Australian Nuclear Science and Technology Organisation (ANSTO), Sydney, Australia. A small sample of teeth were then cut in the mid sagittal plane and analysed using ANSTO High Energy Heavy Ion Microprobe. Maps and linear profiles were produced showing the distribution of iron across the enamel. Results show that both the levels and distribution of iron in archaeological teeth is quite different to contemporary teeth, raising the suggestion that iron has been significantly altered by the post-mortem environment.

  14. Bovine Herpesvirus 4 infections and bovine mastitis

    NARCIS (Netherlands)

    Wellenberg, Gerardus Johannus

    2002-01-01

    Mastitis is an often occurring disease in dairy cattle with an enormous economic impact for milk producers worldwide. Despite intensive research, which is historically based on the detection of bacterial udder pathogens, still around 20-35% of clinical cases of bovine mastitis have an unknown

  15. Bovine Herpesvirus 4 infections and bovine mastitis

    NARCIS (Netherlands)

    Wellenberg, Gerardus Johannus

    2002-01-01

    Mastitis is an often occurring disease in dairy cattle with an enormous economic impact for milk producers worldwide. Despite intensive research, which is historically based on the detection of bacterial udder pathogens, still around 20-35% of clinical cases of bovine mastitis have an unknown aetiol

  16. Asymmetry in development (mineralisation of permanent mandibular canine roots

    Directory of Open Access Journals (Sweden)

    Burić Mirjana V.

    2012-01-01

    Full Text Available Introduction. The development of the teeth is closely associated with the proper and unobstructed physical and psychological development of the child. Aim. To determine the existence of asymmetry in the development of the roots of the lower permanent canine teeth in different age groups of children of both sexes. Material and methods. The study was conducted on 523 ortopantomograms (253 boys and 270 girls of orthodontic patients aged 6 to 14 years of the Dental Clinic in Niš. We analyzed the development of asymmetry in the lower permanent canine root, using the method of Gleiser and Hunt, or the modification by Tijanić (1981. Results. It was found that asymmetry in the development of the root in both sexes of the lower canine teeth was present in 20 patients (3.82%, 10 boys (3.95% and 10 girls (3.70%. The difference is in the range of one stage. Asymmetric development of the roots of the lower incisors in girls and boys usually present in the 7th and 8th stages (60% in girls and in 50% in boys. In 90% of girls in developing asymmetry the root of the lower canine is present in a single stage, and in 10% of girls it presents within three stages. Asymmetric development of the root of the lower canine is the most common in the 7th and 8th stages of development (55%. Conclusion. Asymmetric root development of permanent lower canines was found in 3.82% of patients. More than half of respondents (55% had asymmetrical canine root development stage in half and three quarters of the total root length. The results of this study indicate that the canine is the tooth with very little variations in its development.

  17. Modified Revascularization in Human Teeth Using an Intracanal Formation of Treated Dentin Matrix: A Report of Two Cases.

    Science.gov (United States)

    Mehrvarzfar, Payman; Abbott, Paul V; Akhavan, Hengameh; Savadkouhi, Sohrab Tour

    2017-01-01

    Ethylenediaminetetraacetic acid (EDTA)-treated dentin matrix (TDM) is an enriched source of bioactive molecules. Therefore, it was hypothesized that fabrication of autogenous TDM on root dentinal walls of necrotic immature permanent teeth may allow more predictable outcome of revascularization treatments. Two young patients with permanent nonvital immature teeth were chosen for revascularization treatment. After appropriate disinfection of root canal system, TDM was fabricated on root dentinal walls using different dilutions of EDTA. Then, bleeding was induced in canals and calcium-enriched mixture (CEM) cement was placed over the blood clots. In all follow-up periods, both cases were asymptomatic and radiographic findings have shown a continued root development. Revascularization is a valuable treatment for nonvital immature teeth, allows continuation of root development. Modification of root regeneration through a TDM protocol may seem more predictable treatment and improve maturogenesis than traditional therapy.

  18. Treatment of Ectopic Mandibular Second Permanent Molar with Elastic Separators

    Directory of Open Access Journals (Sweden)

    R. Rajesh

    2014-01-01

    Full Text Available Ectopic eruption is a developmental disturbance in which the tooth fails to follow its normal eruption pathway. Ectopic eruption of the second molar is relatively rare. This paper presents the case of thirteen-year-old male with an ectopic mandibular second permanent molar. The condition was corrected with surgical exposure and placement of elastic separators. This case report lays emphasis on the practice of basic methods to obtain acceptable results rather than extensive surgical or orthodontic corrections. It is advised that ectopic teeth should not be neglected especially when it concerns developing caries and malocclusion.

  19. Esthetic reconstruction of teeth in patient with dentinogenesis imperfecta--a case report.

    Science.gov (United States)

    Knezević, Alena; Tarle, Zrinka; Pandurić, Vlatko

    2006-03-01

    Dentinogenesis imperfecta (DI) is the result of a dominant genetic defect and affects both the deciduous and permanent dentitions. It is characterized by opalescent teeth composed of irregularly formed and undemineralized dentin which obliterates pulp chamber and root canal. DI can appear as a separate disorder or with osteogenesis imperfecta (OI). The teeth with DI show a grayish-blue to brown hue with dislodged enamel, dysplastic dentine with irregular dentinal tubules and interglobular dentine, short roots and pulpal obliteration, which all may lead to rapid and extensive attrition which require adequate crown reconstruction. The aim of this study was to show a reconstruction of frontal teeth in upper jaw with direct composite veneers in young adult patient with DI.

  20. Positioning of anterior teeth in removable dentures

    Directory of Open Access Journals (Sweden)

    Strajnić Ljiljana

    2002-01-01

    Full Text Available Introduction The aim of this paper was to present methods of placement of artificial anterior teeth in edentulous individuals. The following review takes account of the majority of papers published during the last 100 years. The review has been divided into sections regarding the method used to determine the position of artificial anterior teeth. Geometric aspect Gysi (1895-1920 produced the first scientific theory about the position of artificial anterior teeth. Physiognomic theory The aim of this theory is to find the most natural position for artificial anterior teeth for each individual. Camper's "face angle" as a physiognomic criterion, has been introduced in papers of Wehrli (1961, Marxhors (1966, Tanzer (1968, Lombardi (1973. Esthetic aspect Important names in the field of dental esthetics are: Schön and Singer (1961, Arnheim (1965, Krajiček (1969, Tanzer (1968, Lombardi (1973, Goldstein (1976. They have introduced principles of visual aspects for selection of contours, dimension and position of artificial anterior teeth. Constitution aspect Flagg (1880, Williams (1913 and Hrauf (1957, 1958, have considered body constitution and individual characteristics regarding position of artificial anterior teeth. Physiological theory In 1971, Marxhors pointed to the fact that the position of artificial teeth corresponds with the function of the surrounding soft tissue and from the aspect of physiognomy as well. Phonetic aspect According to Silverman (1962 artificial anterior teeth are nearest when we pronounce the sound "S". Cephalometrical research Rayson (1970, Watson (1989, Strajnić Lj. (1999, Bassi F. (2001 have presented cephalometric radiographic analyses of natural anterior teeth compared with cephalometric radiographic analyses of artificial anterior teeth. A review of dental literature shows several factors suggesting modalities which should determine the position of artificial anterior teeth. Numerous methods have been designed for

  1. Study on cogging force of permanent magnet linear synchronous motor

    Institute of Scientific and Technical Information of China (English)

    SHANGGUAN Xuan-feng; YUAN Shi-ying; LI Qing-fu

    2005-01-01

    Presented the methods to obtain the cogging force of permanent magnet linear synchronous motors(PMLSMs), analyzed the characteristics of the cogging force,and provided a basis for reducing the effect of the cogging force. 2-dimensional finite element method(2D FEM) was used to solve the whole motor when its mover was at different position, so that the relation was derived between the cogging force and the mover position. The analysis results show that the cogging force between the two ends of the primary iron-core and the secondary permanent magnets (PMs) is sinusoidal function of the mover position under certain conditions only. Two proposed methods,namely direct and indirect methods, are applied to calculate the cogging force between the primary iron-core teeth and the secondary PMs. The agreement of the two methods is validated.

  2. Permanent molar pulpotomy with a new endodontic cement: A case series

    Directory of Open Access Journals (Sweden)

    Asgary Saeed

    2009-01-01

    Full Text Available The aim of this case series was to determine the clinical and radiographic success rate of pulpotomy, with new endodontic cement (NEC, in human mature permanent molar teeth. Twelve molars with established irreversible pulpitis were selected from patients 14 - 62 years old. The selection criteria included carious pulp exposure with a positive history of lingering pain. After isolation, caries removal, and pulp exposure, pulpotomy with NEC was performed and a permanent restoration was immediately placed. At the first recall (+1 day no patients reported postoperative pain. One wisdom tooth had been extracted after two months because of failure in coronal restoration. Eleven patients were available for the second recall, with a mean time of 15.8 months. Clinical and radiographic examination revealed that all teeth were functional and free of signs and symptoms. Histological examination of the extracted teeth revealed complete dentin bridge formation and a normal pulp. Although the results favored the use of NEC, more studies with larger samples and a longer recall period were suggested, to justify the use of this novel material for treatment of irreversible pulpitis in human permanent molar teeth.

  3. Mirror imaging of impacted and supernumerary teeth in dizygotic twins: A case report.

    Science.gov (United States)

    Cassetta, Michele; Altieri, Federica; Giordano, Alessandra

    2015-02-01

    Mesiodens is the most common type of supernumerary tooth found in the premaxilla. It might be discovered by the clinical examination by chance on a radiograph or as the cause of an unerupted maxillary central incisor. The genetic transmission of supernumerary and impacted teeth is poorly understood. Mirror imaging in twins has been reported frequently in relation to several unilateral dental anomalies including mesiodens. This phenomenon is the appearance of an asymmetrical feature or anomaly occurring on the right side of one twin but on the left side of the other twin. The event of mesiodens mirror imaging in monozygotic twins has been described in literature. This is the first reported case of mesiodens mirror images in dizygotic twins. The de-scribed mesiodens caused the eruption failure of maxillary permanent incisors. The super-numerary teeth were removed to facilitate the spontaneous eruption of the impacted perma-nent maxillary incisors. Studies related to supernumerary teeth can be useful to clinicians in the early diagnosis of this anomaly. Clinical and radiographic examinations provide a correct therapeutic approach. Key words:Supernumerary teeth, twins, dental development.

  4. Supernumerary teeth "mesiodens". Case report.

    Science.gov (United States)

    Itro, A; Difalco, P

    2003-09-01

    The supernumerary tooth is an anomaly of dental eruption that is not rare to find in the clinical practice. Among the supernumerary teeth the "mesiodens" is most frequent. The mesiodens is found in the region of the superior central incisors and it can be the cause of many complications. The aim of this work is the description of a rare symptomatic case of mesiodens and the diagnostic and therapeutic strategies to adopt when this dental anomaly occurs. In particular the authors suggest making radiographic examinations only in the family of patients with dental anomalies of number, thinking that the incidence of such anomalies is too low to justify mass radiographic examinations.

  5. Comparison of Radiography, Laser Fluorescence and Visual Examination for Diagnosing Incipient Occlusal Caries of Permanent First Molars

    OpenAIRE

    Bahrololoomi, Zahra; Ezoddini, Fateme; Halvani, Niloofar

    2015-01-01

    Objectives: Early diagnosis of incipient and non-cavitated carious lesions is crucial for performing preventive treatments. The aim of this study was to compare the efficacy of three diagnostic methods of bitewing radiography, DIAGNOdent, and visual examination in diagnosing incipient occlusal caries of permanent first molars. Materials and Methods: In this diagnostic cross-sectional study, 109 permanent first molar teeth of 31 patients aged 7–13 years were examined visually, on bitewing radi...

  6. Field Surgical Intervention of Bovine Actinomycosis

    Directory of Open Access Journals (Sweden)

    U. Farooq*, A. Qayyum, H. A. Samad, H. R. Chaudhry and N. Ahmad1

    2010-10-01

    Full Text Available Actinomycosis, or lumpy jaw, is an important cause of economic losses in livestock because of its widespread occurrence and poor response to the routine clinical treatment. The present study describes a typical case of bovine actinomycosis in a seven-month pregnant Sahiwal heifer with a hard swelling on the middle of the maxilla bone at the level of the central molar teeth. Tentative diagnosis was made through clinical signs. After maturation of the swelling, the area was incised under local anesthesia and debridement of the wound was achieved by sharp surgical debridement and mechanical debridement. Pus, having the appearance of sulphur granules, was completely removed from the excised cavity, which was closed by applying mattress sutures. Adjunct therapy of broad-spectrum antibiotic was administered intramuscularly for five days as a post-operative measure. Catamnesis revealed that the healing was complete in 15 days with no recurrence and untoward consequences.

  7. The effect of unerupted permanent tooth crowns on the distribution of masticatory stress in children.

    Directory of Open Access Journals (Sweden)

    Ashley S Hammond

    Full Text Available Human mothers wean their children from breast milk at an earlier developmental stage than do ape mothers, resulting in human children chewing solid and semi-solid foods using the deciduous dentition. Mechanical forces generated by chewing solid foods during the post-weaning period travel through not only the deciduous teeth, but also the enamel caps of the developing permanent teeth within the maxilla and mandible, which are not present in the adult face. The effects of mechanical stress propagating through these very stiff structures have yet to be examined. Based on a heuristic model, we predicted that the enamel of the embedded developing teeth would act to reduce stresses in the surrounding bony elements of the juvenile face. We tested this hypothesis by simulating occlusal loading in a finite element (FE model of a child's cranium with a complete set of deciduous teeth and the first permanent molars embedded in the bony crypt in the maxilla. We modeled bone and enamel with appropriate material properties and assessed the effect of embedding high-stiffness enamel structures on stress distribution in the juvenile face. Against expectation, the presence of unerupted enamel caps does not affect the magnitude or location of stresses in the juvenile face. Our results do not support the hypothesis that the unerupted secondary teeth act to moderate stresses in the juvenile face.

  8. [Esthetic restorations of primary anterior teeth].

    Science.gov (United States)

    Elqadir, A Jamil; Shapira, J; Ziskind, K; Ram, D

    2013-04-01

    Esthetic treatment of primary teeth is one of the greatest challenges to pediatric dentists. A variety of restorative options using full coverage are available for anterior primary teeth. In the last half century the emphasis on treatment of severely decayed primary teeth shifted from extraction to restoration. In the past, restorations consisted of placement of stainless steel crowns on severely decayed teeth. However, they are esthetically unacceptable today. Over the last decade parents expect a higher esthetic standard for their children's primary teeth. Thus, the restoration should provide esthetic appearance and durability in addition to restoring function. The purpose of this review is to describe the types of full coverage options for anterior primary teeth currently available.

  9. Supernumerary teeth in non-syndromic patients

    Energy Technology Data Exchange (ETDEWEB)

    Mali, Santosh; Karjodkar, Freny Rashmiraj; Sontakke, Subodh; Sansare, Kaustubh [Nair Hospital Dental College, Maharashtra (India)

    2012-03-15

    Hyperdontia or supernumerary teeth without associated syndrome is a rare phenomenon, as supernumerary teeth are usually associated with cleft lip and palate or other syndromes such as Gardner's syndrome, cleidocranial dysplasia, and so on. Five patients with supernumerary teeth visited our department. They had no familial history or other pathology, certain treatment protocols was modified due to the presence of supernumerary teeth. Non-syndromic supernumerary teeth, if asymptomatic, need to have periodical radiographic observation. If they showed no variation as they impacted in the jaw, careful examination is necessary because they may develop into pathological status such as dentigerous cysts. The importance of a precise clinical history and radiographic examination for patients with multiple supernumerary teeth should be emphasized.

  10. Orthodontic movement of endodontically treated teeth

    Directory of Open Access Journals (Sweden)

    Alberto Consolaro

    2013-08-01

    Full Text Available Often there is the need of moving teeth endodontically treated or teeth still in endodontic treatment. In order to collaborate with the comprehension and substantiation of the following subjects will be discussed: 1 Orthodontic movement in endodontically treated teeth without periapical lesion, 2 Orthodontic movement in endodontically treated teeth with inflammatory periapical lesion, and 3 Orthodontic movement in teeth endodontically treated due to aseptic pulp necrosis by dental trauma. In practically all situations, endodontically treated teeth to be orthodontically moved must be subjected to a careful evaluation by the endodontist about the conditions, adequate or not, of the endodontic treatment. Then, in this paper it was sought to induce an insight for new clinical researches about the theme that may definitely prove the information obtained by interrelations of information in parallel to clinical practice.

  11. Bovine Herpesvirus 4 infections and bovine mastitis

    OpenAIRE

    Wellenberg, Gerardus Johannus

    2002-01-01

    Mastitis is an often occurring disease in dairy cattle with an enormous economic impact for milk producers worldwide. Despite intensive research, which is historically based on the detection of bacterial udder pathogens, still around 20-35% of clinical cases of bovine mastitis have an unknown aetiology. Due to the high number of unknown causes of clinical mastitis, studies were undertaken to gain more insight into the role of viruses in this important disease. For the first time, we found tha...

  12. Prevalence and distribution of anomalies of permanent dentition in 9584 Japanese high school students.

    Science.gov (United States)

    Hagiwara, Yoshiyuki; Uehara, Tamotsu; Narita, Tatsuya; Tsutsumi, Hirofumi; Nakabayashi, Shinya; Araki, Masao

    2016-09-01

    This study investigated the prevalence and distribution of anomalies of permanent dentition in the current Japanese population by examining an unbiased sample. We conducted a survey of dental anomalies by mass dental screening at eight high schools in 2012. Participants were all students with permanent dentition. Dental anomalies were classified as hypodontia, supernumerary teeth, peg-shaped teeth, fused teeth, and talon cusps. Students with one or more dental anomalies on oral examination were given a differential diagnosis by three specialists. The final sample comprised 9584 participants (5062 boys, 4522 girls). Hypodontia was present in 372 students (3.88 %) with no significant sex difference (191 boys, 181 girls). Frequent sites were the right or left mandibular second premolar, right or left maxillary second premolar, and right or left maxillary lateral incisor. Supernumerary teeth were observed in three boys (0.06 %) and one girl (0.02 %). Peg-shaped teeth were observed in 74 students (0.77 %; 27 boys, 47 girls), differing significantly between sexes; they were most prevalent among maxillary lateral incisors. Of affected students, 18 students (0.19 %) also had hypodontia (3 boys, 15 girls). Fused teeth were present in two boys (0.04 %) and three girls (0.07 %) (gemination in one boy and fusion in the remaining four students). Sites were limited to maxillary and mandibular central and lateral incisors. Talon cusps were observed in two boys (0.04 %) and four girls (0.09 %). The present survey of a large unbiased sample can be considered to reflect the prevalence and distribution of anomalies of permanent dentition in the current Japanese population.

  13. Application of bonding system as a sub-base material following electrosurgical pulpotomy treatment in primary teeth: a novel technique

    Directory of Open Access Journals (Sweden)

    Alireza Sarraf Shirazi

    2009-05-01

    Full Text Available "nCarious primary teeth are still a great problem in many countries. Maintaining these teeth, which play a significant role in chewing, guiding the permanent teeth to erupt normally and keeping the ideal dental arch size, is very important. The most common treatment of the deep carious primary teeth is pulpotomy. Many techniques and sub-base materials have been suggested for this purpose. "nAll traditional sub-base materials have been found to have different percentages of failure. Bonding systems are widely used in dentistry for tooth restoration. Their greatest advantage is providing better seal in the tooth-restoration interface, which is the primary goal in restorative dentistry.  The authors' suggestion is to use these materials as a sub-base agent subsequent to the electrosurgical pulpotomy technique. Bonding systems are easy to use, time efficient, biocompatible, do not need sealing pressure, and additionally provide an ideal seal.

  14. Regional odontodysplasia (Ghost teeth). A case report.

    OpenAIRE

    Kannan S; Saraswathi K

    2001-01-01

    Regional odontodysplasia is a rare development anomaly affecting the teeth with an unknown etiology. This dental abnormality involves the hard tissues of the teeth that are derived from both epithelial (enamel) and mesenchymal (dentine & cementum) components of the tooth forming apparatus. Teeth in a region or quadrant of maxilla or mandible are affected to the extent that they exhibit short roots, wide open apical foramen and large pulp chamber, the thinness and poor mineralisation quali...

  15. Prevalence and characterıstıcs of supernumerary teeth in a child population from Central Anatolıa - Turkey.

    Science.gov (United States)

    Arikan, Volkan; Ozgul, Betul Memis; Firdevs, Tulga O Z

    2013-12-01

    This article aimed to characterize the incidence of supernumerary teeth in Turkish children according to sex, location, number and morphology and to explore possible correlations between these variables. The study population comprised 7,551 non-syndromic patients aged 3-16 years who applied for routine check-ups at the Ankara University Department of Pediatric Dentistry between January 2009 and January 2010. The population included children in deciduous, mixed and permanent dentition. Both clinical and radiographic examinations were conducted. Demographic variables (age, sex) as well as number, location (maxilla or mandible), position, type and morphology of supernumeraries were recorded for all patients with supernumerary teeth. Supernumerary teeth with odontomes were also noted. Of the 7,551 patients examined, supernumerary teeth were detected in 74 patients (0.98%). Of these, 48 were male and 26 were female (male-to-female ratio: 1.84:1). A total of 84 supernumerary teeth were detected, 80 (95.2%) of which were permanent teeth and 4 (4.8%) of which were deciduous teeth (n=4). Most supernumerary teeth (n=59, 70.2%) were located in the maxillary arch. The most common supernumerary teeth were mesiodens (36.9%), followed by supernumerary teeth located in the maxillary incisor region (33.3%), the mandibular premolar region (17.9%), the mandibular molar region (5.9%), the mandibular incisor region (4.8%) and the mandibular canine region (1.2%). The prevalence of supernumerary teeth was found to be 0.98% and mesiodens was the most frequent type.

  16. Permanent deformation of asphalt mixes

    NARCIS (Netherlands)

    Muraya, P.M.

    2007-01-01

    This dissertation describes the results of a research that was conducted on the permanent deformation of asphalt mixtures. Central to this research was the separate characterization of the contribution of the aggregate skeleton and the bituminous mortar towards resistance to permanent deformation. T

  17. Permanent-Magnet Meissner Bearing

    Science.gov (United States)

    Robertson, Glen A.

    1994-01-01

    Permanent-magnet meissner bearing features inherently stable, self-centering conical configuration. Bearing made stiffer or less stiff by selection of magnets, springs, and spring adjustments. Cylindrical permanent magnets with axial magnetization stacked coaxially on rotor with alternating polarity. Typically, rare-earth magnets used. Magnets machined and fitted together to form conical outer surface.

  18. A Histopathological Comparison of Pulpal Response to Chitra-CPC and Formocresol used as Pulpotomy Agents in Primary Teeth: A Clinical Trial

    OpenAIRE

    2012-01-01

    ABSTRACT Preventive measures have helped to minimize the occurrence of dental caries. However, premature loss of primary teeth on account of dental caries still remains a common problem among children. The pulpotomy technique has been the choice for treating vital primary and young permanent teeth with carious, mechanical and traumatic pulp exposures. The ideal pulpotomy medicament should be bioinductive or at least biocompatible, bactericidal and harmless to the pulp and surrounding structur...

  19. The "Permanent" Patient Problem.

    Science.gov (United States)

    Bruce, Courtenay R; Majumder, Mary A

    2014-01-01

    Patients who enter the health care system for acute care may become "permanent" patients of the hospital when a lack of resources precludes discharge to the next level of post-acute care. Legal, professional, and ethical norms prohibit physician and acute care hospital "dumping" of these patients. However, limitless use of hospital resources for indefinite stays is untenable. In the absence of hospital policy addressing this specific issue, the availability of financial support will be determined by health care professionals' willingness to advocate for the patient and negotiate with hospital administrators and the ability and willingness of administrators to authorize the use of hospital resources. We propose five mid-level ethical principles to guide advocacy and administrative decision-making about provision of financial support for post-acute care for those patients who cannot afford it. We use two actual, de-identified cases to illustrate how these principles can be used to make reasoned, consistent decisions about the provision of post-acute financial support.

  20. Replantation after extended dry storage of avulsed permanent incisors: report of a case.

    Science.gov (United States)

    Cobankara, Funda Kont; Ungor, Mete

    2007-08-01

    A 15-year-old boy lost his maxillary right and left central incisor teeth in a bicycle accident. He was referred to our clinic 1 week after the injury. The crown-root integrities of both the teeth were not damaged. Although the teeth were stored under dry conditions for 1 week, reimplantation of the teeth was planned to retain the teeth in the mouth for as long a period as possible because of the patient's age. Following the debridement and sterilization of root surfaces in 2.5% NaOCl, root canals were prepared and filled with calcium hydroxide. Then, about 2 mm of the apexes were resected to ensure that the roots easily seated in the alveolar socket and the prepared cavities in root ends were obturated with the amalgam. The teeth were placed into their respective sockets and splinted temporarily. The root canal therapy was completed 5 weeks later. Ankylosis was observed radiographically after 10 months. The patient is now 23 years old and he is still able to use both the central incisors functionally. However, there is a pink appearance on the cervical buccal surface of left central incisor because of progressive replacement resorption. In this case, the new treatment plan is to perform a permanent restoration with dental implants following the extraction of both teeth. Even though the long-term prognosis is uncertain, this treatment technique has provided an advantage for the patient in his adolescent period by maintaining the height of alveolar bone and making the provision of an aesthetically acceptable permanent restoration at a later age possible.

  1. Sexing Bovine Embryos Using PCR Amplification of Bovine SRY Sequence

    Institute of Scientific and Technical Information of China (English)

    曾溢滔; 张美兰; 陈美珏; 周霞娣; 黄英; 任兆瑞; 黄淑帧; 胡明信; 吴学清; 高建明; 张斌; 徐慧如

    1994-01-01

    This study analyses the bovine SRY DNA sequence by direct sequencing procedure, followed by the designation of the PCR primers specific for bovine SRY. Using PCR amplification of bovine SRY gene, the embryo sex was determined. The results of the embryo sex identification were confirmed after the embryo transfer and pregnancies.

  2. Dens invaginatus in ancient Chinese teeth of 2,000 years ago.

    Science.gov (United States)

    Shi, Sasa; Duan, Xiaohong; Shao, Jinling; Duan, Qingbo; Peng, Shaobin

    2013-10-01

    Dens invaginatus (DI) is a developmental anomaly of teeth. Here we observed the characteristics of DI in 517 permanent teeth from 67 ancient Chinese people using micro-computed tomography (micro-CT) scanning techniques. The individuals were excavated from Shaanxi province of China and identified to be about 2,000 years old. Four DI categories are proposed to distinguish the different types of DI. The invaginated lingual fossa is classified into three classes. The overall prevalence of DI in 67 individuals was 31.34% (21 of 67). DI was found in 25 of 517 teeth (4.83%). All affected teeth were maxillary lateral incisors. The invaginated lingual fossa (Type I DI) occurred most frequently (84%), followed by radicular grooves (Type II; 16%), while Type III and Type IV were not found in the present study. Some of fossae correspond with radicular grooves (8 of 21; 3 located at mesial, 5 were distal). The bilateral incidence of DI was 19.05%. Comparing our results to those of a retrospective survey of DI from 1873 to present, we found a higher rate of DI in the excavated teeth of Chinese individuals 2,000 years ago. The use of the micro-CT technique and ethnic origin might have contributed to the higher incidence of DI.

  3. Unerupted teeth associated with dentigerous cysts and treated with coronectomy: mini case series.

    Science.gov (United States)

    Patel, Vinod; Sproat, Chris; Samani, Meera; Kwok, Jerry; McGurk, Mark

    2013-10-01

    There is a resurgence of interest in coronectomy, but its appropriate application in the management of third molar teeth has yet to be defined. Dentigerous cysts associated with unerupted teeth are most commonly associated with mandibular third molars. In this case series we evaluate outcome after coronectomy of teeth with associated dentigerous cysts in cases where the inferior dental nerve was thought to be at risk, or there was an increased risk of mandibular fracture. We retrospectively studied 21 consecutive patients treated by coronectomy for dentigerous cysts at the Oral Surgery Department at Guy's Hospital. The most commonly affected teeth were mandibular third molars (20/21). One patient had permanent injury to the inferior dental nerve, but no mandibular fracture or recurrence of cyst was reported. One patient required secondary retrieval of the retained root because of eruption. Coronectomy of unerupted teeth associated with dentigerous cysts is an effective treatment when there is high risk of injury to the inferior dental nerve injury or potential for mandibular fracture. Further work with larger numbers and longer follow-up is required to discover the long-term outcome of the electively retained root.

  4. MTA pulpotomy of human permanent molars with irreversible pulpitis.

    Science.gov (United States)

    Eghbal, Mohammad Jafar; Asgary, Saeed; Baglue, Reza Ali; Parirokh, Masoud; Ghoddusi, Jamileh

    2009-04-01

    The histological success of mineral trioxide aggregate (MTA) pulpotomy for treatment of irreversible pulpitis in human teeth as an alternative treatment was investigated in this study. Fourteen molars which had to be extracted were selected from patients 16-28 years old. The selection criteria include carious pulp exposure with a history of lingering pain. After isolation, caries removal and pulp exposure, MTA was used in pulpotomy treatment. Patients were evaluated for pain after 24 h. Two patients were lost from this study. Twelve teeth were extracted after 2 months and were assessed histologically. Recall examinations confirmed that none of the patients experienced pain after pulpotomy. Histological observation revealed that all samples had dentin bridge formation completely and that the pulps were vital and free of inflammation. Although the results favour the use of MTA as a pulpotomy material, more studies with larger samples and a longer recall period are suggested to justify the use of MTA for treatment of irreversible pulpitis in human permanent teeth.

  5. A Proposed Mechanism for Congenitally Missing Teeth: Basic and Clinical Evidence

    Directory of Open Access Journals (Sweden)

    Gajanan Kulkarni

    2011-05-01

    Full Text Available Introduction: Although the de-velopment of normal dentition has been explored extensively, the mechanisms underlying congenitally missing teeth are far less understood.The hypothesis: Congenital absence of teeth occurs due to arrested development of a tooth primordium followed by involution, only at a stages preceding mineralized tissue formation.Evaluation of the hypothesis: We compared H & E stained serial sagittal sections of wild-type and EL mice that are congenitally missing 3rd molars (3M. 3M development was followed longitudinally in both types of mice. Occurrence of apoptosis was examined using a fluorescent TUNEL assay. To determine if a similar process might account for congenital ab-sence of human teeth, we examined serial radiographs of developing dentitions. In EL mice, congenital absence of 3M is caused, not by a failure of initiation of tooth development rather; tooth development is initiated and subsequently ar-rested during early cap stage. This arrested tooth primordium is subsequently removed physiologically by apoptosis. Examination of serial radiographs where missing teeth were identified lent further evi-dence to support this hypothesis. Follicle spaces, with no calcified tissue within them, were noted at early stages which were seen to remodel and eventually blend with adjacent bone. Permanent teeth failed to develop in those locations. Based on the animal and human data, we propose a new model for congenital absence of teeth. Validation of this model could have profound clinical implications. If the genetic me-chanisms involved in this proposed mechanism can be elucidated, it might lead to non-surgical management of supernumerary teeth.

  6. Effect of Thermocycling on Microleakage of New Adhesive Systems on Primary Teeth: An In-Vitro Study

    Directory of Open Access Journals (Sweden)

    Ramin Atash

    2013-09-01

    Full Text Available Introduction: This study investigated the sealing ability of three different adhesives in primary bovine teeth. Methods: Facial and lingual class V cavities were prepared half in enamel and half in cementum, in 48 bovine primary mandibular incisors and randomly divided into three groups and each group divided to two subgroups. The tested adhesives were XPBond (XP, ClearfilS3 Bond (S3, and Xeno III (XE. All cavities were restored with composite and light cured. After 24 hours storage in 37°C distilled water and polishing, teeth were thermocycled and sealed with nail varnish. Then, they were stored in 2% methylene blue and dye penetration was evaluated under a stereomicroscope. Results: No significant differences were recorded in the microleakage value between three adhesives in enamel and dentin margins (p>0.0.5 before and after thermocycling. The lowest microleakage value was obtained in XE followed by XP and S3. Conclusion: There were not any differences between adhesives in enamel and dentin margins of class V cavities on primary bovine teeth.

  7. Enzootic bovine leukosis and Bovine leukemia virus

    OpenAIRE

    Amauri Alcindo Alfieri; Alice Fernandes Alfieri; Luis Álvaro Leuzzi Junior

    2004-01-01

    All over de World the Enzootic Bovine Leukosis is a important viral infection in cattle herds. This revision points out topics relative to the etiological agent, clinical signals, diagnosis methods, control and prophylaxis of the infection.A Leucose Enzoótica Bovina é uma infecção viral amplamente disseminada em rebanhos bovinos de todo o mundo. Esta revisão tem por objetivo apresentar tópicos relacionados ao agente etiológico, à doença clínica e aos métodos de diagnóstico, controle e profila...

  8. Concrescent triplets involving primary anterior teeth

    Directory of Open Access Journals (Sweden)

    Urvashi Sharma

    2013-01-01

    Full Text Available Odontogenesis is a complex process wherein more than 200 genes are known to play a significant role in tooth development. An imbalance can lead to an abnormality in the number, size, shape or structure of the developing tooth/teeth. The presence of an extra dental lamina forms a supernumerary tooth. The supernumerary teeth are of two types: A rudimentary tooth where the supernumerary tooth does not resemble any tooth in the normal series or a supplemental tooth in which this anomalous tooth resembles one in the normal series. It is also very rare to encounter triple teeth in primary dentition. The union of these teeth may be through fusion, gemination, concrescence or a combination of fusion and gemination. Presented is a rare case of concrescence involving maxillary deciduous incisors and a supplemental tooth in a 7-year-old boy. The differential diagnosis, etiology, and complications of primary anterior triple teeth are discussed.

  9. Principles of treatment planning for compromised first permanent molars in mixed dentition period: A review article

    Directory of Open Access Journals (Sweden)

    Behrad Tanbakuchi

    2017-02-01

    Full Text Available Background and Aims: The first permanent molar is susceptible to caries, endodontic complications and developmental anomalies. Compromised teeth with poor prognosis could cause the clinician to face dilemmas. The aim of this review article was to assess recent guidelines on the treatment planning of compromised first permanent molars in mixed dentition period. Materials and Methods: The design of the study was based on review of literature by searching the MEDLINE, Web of science and Google scholar. Key words (permanent first molar, extraction, treatment plan were used. This search was limited to the English articles published after the year 2000. Conclusion: A number of factors influenced decision-making process regarding compromised first permanent molars including the restorative status of the tooth, dental age of the patient, degree of crowding and occlusal relationships were assessed. The ideal time for removal of these teeth was 8-9 years of age. However, the current evidence for managing compromised first permanent molars demands clinical trials.

  10. Surgical repositioning of intruded immature permanent incisor: An updated treatment concept

    Directory of Open Access Journals (Sweden)

    Garg S

    2008-10-01

    Full Text Available Intrusion of immature permanent anterior teeth presents a great dilemma due to variety of treatment options. The ideal treatment option is the one with least probability of developing complications like external root resorption, obliteration of pulp canal, marginal bone loss etc. This paper presents a case report with treatment strategy of repositioning, splinting, successfully attempted apexification and obturation of a completely intruded immature permanent central incisor. Excellent healing with no post-operative complications even after 10 months of follow up.

  11. Maxillary canine-first premolar transposition in the permanent dentition: treatment considerations and a case report.

    LENUS (Irish Health Repository)

    Synodinos, Philippos N

    2010-12-01

    Transposition is defined as the interchange of position between two adjacent teeth within the same quadrant of the dental arch. Permanent maxillary canine-premolar transposition is the most commonly observed transposition in the human dentition. Its prevalence is relatively low and its aetiology remains unclear, although it has been associated with genetic factors. It may also be related to a combination of localised factors such as malformation of adjacent teeth, tooth agenesis, retention of the deciduous canine and a history of local trauma. Treatment is selected on an individual case basis after thoroughly considering the overall facial and dental characteristics, duration of treatment, cost, patient preference and the orthodontist\\'s experience. This article provides a case report of maxillary canine transposition in the permanent dentition, successfully managed with orthodontic treatment.

  12. Early postnatal development of the mandibular permanent first molar in infants with isolated cleft palate

    DEFF Research Database (Denmark)

    Hermann, Nuno V.; Zargham, Mostafa; Darvann, Tron Andre

    2012-01-01

    International Journal of Paediatric Dentistry 2012; 22: 280–285 Background. Based on measurements on dental casts, smaller permanent teeth in children with cleft palate have previously been reported in the literature; however, the early maturation of teeth and the size of the follicles and crowns...... have not been investigated. Hypothesis. The maturation of the mandibular permanent first molar (M1inf) is delayed, and the mesiodistal diameters of the follicle and crown of M1inf, respectively, are reduced in children with isolated cleft palate (ICP). Design. Retrospective, longitudinal. Cephalometric...... X‐rays were available for 2 and 22 months old children with clefts (64 children with ICP, and a control group of 38 children with unilateral incomplete cleft lip). The width of the follicle and the crown of M1inf, and the maturation of M1inf were assessed. Intra‐observer error was acceptable...

  13. Human and Bovine Dentin Composition and Its Hybridization Mechanism Assessed by FT-Raman Spectroscopy

    OpenAIRE

    L. E. S. Soares; A. D. F. Campos; Martin, A. A.

    2013-01-01

    FT-Raman spectroscopy was used to study the human and bovine dentin and their interactions with adhesive systems. Ten human (H) molars and ten bovine (B) teeth were prepared exposing the dentin and then each specimen was divided into two parts. The resulted forty dentin segments were treated either with the total-etch one bottle adhesive (Prime & Bond 2.1, PB) or with the single-step self-etching adhesive (Xeno III, X) and divided into four groups: HPB (control), HX, BPB, and BX. Each group w...

  14. Autotransplantation of Ectopic Permanent Maxillary Incisors

    Science.gov (United States)

    Abd Jalil, Laila; Muhd Noor, Nurhidayah

    2017-01-01

    The report presents examples of successful cases of autotransplantation of ectopic teeth as donor in the treatment of clinically missing maxillary anterior teeth in young patients. The transplanted teeth were either severely ectopic, inverted, rotated or in an unfavourable position that they are commonly sacrificed as a result. Details of surgical technique as well as clinical and radiographic assessments were discussed.

  15. Considerations on morphological abnormalities of permanent teeth in children with cleft lip and palate.

    Science.gov (United States)

    Răducanu, Anca Maria; Didilescu, Andreea Cristiana; Feraru, Ion Victor; Dumitrache, Mihaela Adina; Hănţoiu, Tudor Alexandru; Ionescu, Ecaterina

    2015-01-01

    Oral clefts are commonly associated with dental anomalies of number, size, shape, structure, position and eruption affecting both dentitions. Dental malformations may affect the development, growth and functions of the dento-maxillary apparatus (chewing, aesthetics, speech). The purpose of this paper was to assess the dental morphological variations in a group of patients with cleft lip and/or palate (CLP), as compared with a group of healthy subjects. The study sample included 48 patients with various types of CLP (15 girls and 33 boys) aged between 12.6 years and 17.3 years. The control group (without CLP) consisted of 1447 patients (545 girls and 903 boys). The proportion of patients with dental shape anomalies in the control group was 8.6%, while the proportion of patients with dental shape anomalies in the CLP group was 56.3% (pdental hemiarch affected by CLP were most affected in their morphology.

  16. Reestablishing the Function and Esthetics in Traumatized Permanent Teeth with Large Apical Lesion

    Directory of Open Access Journals (Sweden)

    Alexandra Rubin Cocco

    2016-01-01

    Full Text Available Dental trauma is a challenge for dental integrity and can lead to pulp necrosis. The clinical case reports the diagnosis of a maxillary right central incisor traumatized and its multidisciplinary treatment. Calcium hydroxide material was used to perform the processing apexification. An apical surgery was carried out to remove the apical periodontitis and to return the aesthetics to the patient; internal and external tooth whitening in maxillary right central incisor was performed. We conclude that surgery associated with the root filling in the central incisor led to a successful completion. Moreover, it is of utmost importance to demonstrate the interaction between the various areas of dentistry.

  17. Primary school health teachers’ knowledge regarding the emergency treatment of avulsed permanent teeth in Hamadan

    Directory of Open Access Journals (Sweden)

    Arghavan Kamali

    2016-11-01

    T-test. Results: 81 Health teachers were studied and the ratio of knowledge score of all of health teachers to a maximum knowledge score was obtained to be 43/1%. There was no significant relationship between the school health teacher knowledge and their work experiences and age (P=0.23-0.6, respectively. Average of knowledge score of who were educated was more than who were not educated previously (P<0.001. Conclusion: Primary school health teachers' knowledge of dealing with Avulsion was not at a high level. Therefore, training on the dental trauma cases is quite essential for them.

  18. traumatic dental injuries to permanent anterior teeth in 12-15 year ...

    African Journals Online (AJOL)

    2011-07-07

    Jul 7, 2011 ... hundred (90%) children had not sought treatment for TDIs. Conclusion: ... Thermal sensitivity was experienced by 28 (12.6%), pain by 20 (9%) .... Avulsed. 4. 1.4. Restored due to trauma. 3 .... the home environment (Table 3).

  19. Dentist and practice characteristics associated with restorative treatment of enamel caries in permanent teeth

    DEFF Research Database (Denmark)

    Fellows, Jeffrey L; Gordan, Valeria V; Gilbert, Gregg H

    2014-01-01

    PURPOSE: Current evidence in dentistry recommends non-surgical treatment to manage enamel caries lesions. However, surveyed practitioners report they would restore enamel lesions that are confined to the enamel. Actual clinical data were used to evaluate patient, dentist, and practice characteris...

  20. Stepwise excavation may enhance pulp preservation in permanent teeth affected by dental caries

    DEFF Research Database (Denmark)

    Bjørndal, Lars

    2011-01-01

    ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Ways of enhancing pulp preservation by stepwise excavation-a systematic review. Hayashi M, Fujitani M, Yamaki C, Momoi Y. J Dent 2011;39(2):95-107. Epub 2010 Dec 3. REVIEWER: Lars Bjørndal, DDS, PhD, Dr Odont PURPOSE/QUESTION: To determine the clinical...