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The sealing of second mandibular temporary molar pits and fissure with the laser of Nd: YAG, phosphoric acid and the glass ionomer cement; Selamento de fossulas e fissura de segundo molar deciduo inferior com laser de Nd: YAG, acido fosforico e cimento de ionomero de vidro  

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The main of our study was to check the sealing of second mandibular temporary molar pits and fissure, in vitro, with the laser of Nd: YAG, phosphoric acid at 37% and the glass ionomer cement (CIV, Fuji IX GC).The proposal was to check the structural morphologic changes in the laser irradiation upon the enamel surface to watch the pits and fissure sealing with the glass ionomer cement use after the laser irradiation and to verify the efficiency of the 'double conditioning' (phosphoric acid + Nd: YAG). At the same time we watch the evolution of the temperature in the pulp chamber's inside. Our desire was to achieve a therapeutic alternative technic to prevent the dental caries. The Nd: YAG laser parameters were the same: 79 mJ of energy per pulse; frequency of 5 Hz; mean power of 0,4 W; optical fiber on contact of 320 {mu}m diameter; fluency of 99,52 J/ cm{sup 2}, assuming that the only differential was the time of the laser application on the enamel surface. The samples were prepared with this way: Laser Nd: YAG (53 second) + acid + CIV (Fuji IX); Laser Nd: YAG (53 s); Laser Nd: YAG (20 s + 20 s) + acid + CIV; Laser Nd: YAG (20 s + 20 s); Acid + CIV; Control. Through the scanning electron microscopy (MEV) we noticed fusion and resolidification regions due to the laser irradiation and a better adaptation of the glass ionomer cement when we did the 'double conditioning'. Concerning the temperature increase we can conclude that the echeloned period was the best recommended because the temperature was found in a pattern that would not cause any damage to the dental pulp. For future studies we suggest a longer relaxing time between the laser irradiation, a comparative study of this method with other lasers, the use of other sealing materials and the study with the permanent teeth. (author)

Toda, Maria Aparecida

2003-07-01

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Evaluation of lidocaine and mepivacaine for inferior third molar surgery  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english Objective: The aim of this study was to compare 2% lidocaine and 2% mepivacaine with 1:100,000 epinephrine for postoperative pain control. Study design: A group of 35 patients, both genders were recruited, whose had ages ranged from 13 to 27 years-old and had two inferior third molars in similar positions to be extracted. The cartridges were distributed to the patients according to a randomised pattern, where lidocaine was in the control group and mepivacaine in the exper (more) imental group. Results: Results showed no significant association between the anesthetics and postoperative pain, pulp sensibility after one hour, gender, tooth position and duration of the surgical procedure. Conclusions: It was shown that lidocaine and mepivacaine have similar time of anesthesia, they are adequate for surgical procedures that last one hour, and there was no difference between the two anesthetics in relation to the severety of post-operative pain.

Granja Porto, Gabriela; Cavalcanti Do Egito Vasconcelos, Belmiro; Amorim Gomes, Ana Cláudia; Albert, Daniela

2007-01-01

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Evaluation of accessory furcation canals of permanent mandibular molars using radiography and clearing =Avaliação do canal cavo-interradicular em molares inferiores permanentes através de Rx e diafanização  

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Objetivo: Avaliar a presença do canal cavo-interradicular em molares inferiores permanentes através de radiografias e diafanização. Metodologia: A amostra foi constituída por 344 molares inferiores re-hidratados, preparados e armazenados individualmente em recipientes de vidro. A presença do canal ...

Harb, Leandro José Corrêa et al.

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Movimentação de molares inferiores ancorados em mini-parafusos/ Mandibular molar uprighting, using mini-screw as anchorage  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Freqüentemente a movimentação ortodôntica exige recursos adicionais de ancoragem. Os mini-parafusos têm-se apresentado como uma possível solução. O propósito deste trabalho foi estabelecer um método para a verticalização de molares inferiores inclinados para mesial, utilizando ancoragem em mini-parafusos colocados na região de linha oblíqüa externa da mandíbula. Foram selecionados três pacientes entre 40 a 48 anos (dois do gênero feminino, um do gênero (more) masculino), com molares inferiores inclinados para mesial e distalmente posicionados às áreas edêntulas. Os pacientes foram tratados ortodonticamente durante um período de 6 a 12 meses, com técnica ortodôntica MD3. Mini-parafusos de titânio foram colocados bilateralmente com anestesia local. Uma incisão sobre a linha oblíqüa externa da mandíbula, medindo aproximadamente 1 cm foi realizada em cada lado, distalmente aos molares inclinados. Após descolamento muco-periosteal, mini-parafusos foram implantados e foram realizadas suturas deixando suas cabeças exteriorizadas. Uma semana após a remoção das suturas, cargas ortodônticas (entre 150 a 200 gramas/força) foram aplicadas através de forças elásticas. Verificamos que alguma inflamação foi observada ao redor dos mini-parafusos, mas foi controlada com procedimentos de higienização. O procedimento cirúrgico é simples, podendo ser realizado pelo ortodontista; as formas dimensionais dos mini-parafusos são adequadas e estes são de fácil remoção após uso. Concluímos que o uso de mini-parafusos representa uma alternativa efetiva de ancoragem ortodôntica na verticalização de molares inferiores. Abstract in english Tooth movement frequently requires additional anchorage resources. Mini-screws have been used as a possible solution to this matter. The purpose of this study was to establish a method of mandibular molar uprighting, using mini-screw as anchorage, positioned on the mandibular external oblique line, behind and posterior to the tooth. Three pacients with ages between 40 and 48 years old (two females and one male) were selected. The three of them presented mesially tipped mo (more) lars, positioned posterior to the edentulous areas, on both sides of the mandible. These patients received orthodontic treatment during a period of 6 and 12 months with the MD3 technique. Titanium mini-screws were positioned bilaterally, under local anesthesia. One incision with 1 cm was done in each side of the mandibular external oblique line, distally to the tipped molars. After that, the mini-screws were positioned and sutures were done, leaving the mini-screws heads exposed. After one week, orthodontic loads (between 150 and 200 grams/force) were applied to the mini-screws through elastics. A certain degree of inflammation around the mini-screws was noticed, but it was controlled by hygienic procedure. This surgery procedure was simple and could be done easily by the orthodontist. The dimensions and shapes of the mini-screws proved to be appropriate and their removal after the orthodontic movement were done without difficulty. The result was time reduction on the molars uprighting, without side effects on the others teeth. The use of mini-screws seems to be a good alternative for an effective orthodontic anchorage on the uprighting mandibular molars.

Di Matteo, Rosana Canteras; Villa, Nelson; Sendyk, Wilson Roberto

2005-08-01

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Inferior alveolar nerve damage caused by bone wax in third molar surgery.  

UK PubMed Central (United Kingdom)

The authors present a case of inferior alveolar nerve morbidity attributable to use of bone wax to control haemorrhage during third molar surgery. The patient presented after 11 symptom-free years with parasthesia and, eventually pain in the cutaneous distribution of the right inferior alveolar nerve. Radiographs revealed a 1cm radiolucency consistent with a neuroma. Pathological examination of the surgically resected lesion revealed a foreign body reaction to bone wax. The case illustrates the poor resorption qualities of bone wax and the need for other haemostatic agents to achieve haemostasis in dentoalveolar surgery.

Katre C; Triantafyllou A; Shaw RJ; Brown JS

2010-05-01

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Inferior alveolar nerve damage caused by bone wax in third molar surgery.  

Science.gov (United States)

The authors present a case of inferior alveolar nerve morbidity attributable to use of bone wax to control haemorrhage during third molar surgery. The patient presented after 11 symptom-free years with parasthesia and, eventually pain in the cutaneous distribution of the right inferior alveolar nerve. Radiographs revealed a 1cm radiolucency consistent with a neuroma. Pathological examination of the surgically resected lesion revealed a foreign body reaction to bone wax. The case illustrates the poor resorption qualities of bone wax and the need for other haemostatic agents to achieve haemostasis in dentoalveolar surgery. PMID:20382504

Katre, C; Triantafyllou, A; Shaw, R J; Brown, J S

2010-04-10

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Digital versus conventional panoramic radiography in predicting inferior alveolar nerve injury after mandibular third molar removal.  

Science.gov (United States)

The aim of the study was to compare the accuracy of conventional and digital panoramic radiography (OPG) in relation to 4 specific high-risk signs (interruption of the superior cortical line, diversion, narrowing of the canal, and dark band of the root), which would indicate a close anatomic relationship between third molar roots and the inferior alveolar canal.Four hundred mandibular third molar surgical removals after conventional and 272 after digital radiographs were evaluated in the study. The association between postoperative inferior alveolar nerve (IAN) paresthesia and the presence of any preoperative high-risk signs in the OPG was investigated. Bivariate and multivariate logistic regression analyses were completed to compare the accuracy of conventional and digital radiographic techniques detecting high-risk signs predicting possible IAN paresthesia.Digital OPG results showed significantly higher sensitivity in diversion (P = 0.014) and narrowing (P ratio analysis and multivariate logistic regression analysis did not prove the significant difference between digital and conventional imaging according to the examined high-risk signs. Positive predictive values of the signs were found in conventional radiography between 3.6% and 10.9%, whereas in the digital images, it ranged from 2.9% to 7.9%.The results of this study failed to prove significant difference between the accuracy of digital and conventional OPG for predicting IAN paresthesia, whereas low positive predictive values indicate both imaging techniques as inadequate screening methods for predicting IAN paresthesia after mandibular third molar removal. PMID:22446455

Szalma, József; Lempel, Edina; Jeges, Sára; Olasz, Lajos

2012-03-01

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Valoración de la presencia y estado de erupción del tercer molar inferior en las fracturas del ángulo mandibular  

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Full Text Available Se realizó un estudio prospectivo de 176 pacientes con fractura de mandíbula en el Servicio de Cirugía Maxilofacial del Hospital Provincial Docente «Saturnino Lora» de Santiago de Cuba, durante los años 1990-1995, con la finalidad de analizar la posible interrelación entre las fracturas del ángulo y la presencia y estado de erupción del tercer molar inferior. Se pudo comprobar que la incidencia de dichas fracturas era de gran significación cuando los terceros molares inferiores no erupcionados se hallaban presentes, que había una predisposición más marcada a la fractura del ángulo cuando ésta se producía bilateralmente, así como también que el tercer molar inferior no erupcionado debilitaba el ángulo de la mandíbula, tanto cualitativa como cuantitativamente; o sea, se demostró una relación directa entre la cantidad de espacio óseo ocupado por el tercer molar inferior no erupcionado y la debilidad del área del hueso.A prospective study was performed in 176 patients presenting mandibular factures, treated in Maxillofacial Surgery Service of «Saturnino Lora» Teaching Provincial Hospital, Santiago de Cuba (1990-1995), to analyse possible interrelation between angle fractures and presence and state of eruption of inferior third molars. We check out that incidence of such fractures was significant when non-erupted inferior third molars were present, a remarkable predisposition against angle fracture when this one was bilateral, as well as that non-erupted inferior third molars weakened mandibular angle, both qualitatively as quantitatively; that is, a direct relationship between amount of bone space, occupied by non erupted inferior third molar and weakness of bone area was proved.

José Manuel Díaz Fernández; Ricardo Pérez Arredondo; María de los A. Rodríguez Pérez; Maribel Ruiz Pérez

1998-01-01

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

Science.gov (United States)

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 deciduous tooth and odontoma and placement of a passive lower lingual holding arch. Periodic examination was indicated for follow-up. Early intervention was recommended to manage orofacial disfigurement and to avoid consequent problems.

Memarpour, M.; Rahimi, M.; Bagheri, A.; Mina, K.

2012-01-01

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Digital versus conventional panoramic radiography in predicting inferior alveolar nerve injury after mandibular third molar removal.  

UK PubMed Central (United Kingdom)

The aim of the study was to compare the accuracy of conventional and digital panoramic radiography (OPG) in relation to 4 specific high-risk signs (interruption of the superior cortical line, diversion, narrowing of the canal, and dark band of the root), which would indicate a close anatomic relationship between third molar roots and the inferior alveolar canal.Four hundred mandibular third molar surgical removals after conventional and 272 after digital radiographs were evaluated in the study. The association between postoperative inferior alveolar nerve (IAN) paresthesia and the presence of any preoperative high-risk signs in the OPG was investigated. Bivariate and multivariate logistic regression analyses were completed to compare the accuracy of conventional and digital radiographic techniques detecting high-risk signs predicting possible IAN paresthesia.Digital OPG results showed significantly higher sensitivity in diversion (P = 0.014) and narrowing (P < 0.002) of the canal, whereas the specificity of these signs was significantly lower (P < 0.001 and P = 0.035). The likelihood ratio analysis and multivariate logistic regression analysis did not prove the significant difference between digital and conventional imaging according to the examined high-risk signs. Positive predictive values of the signs were found in conventional radiography between 3.6% and 10.9%, whereas in the digital images, it ranged from 2.9% to 7.9%.The results of this study failed to prove significant difference between the accuracy of digital and conventional OPG for predicting IAN paresthesia, whereas low positive predictive values indicate both imaging techniques as inadequate screening methods for predicting IAN paresthesia after mandibular third molar removal.

Szalma J; Lempel E; Jeges S; Olasz L

2012-03-01

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Danger zone in mandibular molars before instrumentation: an in vitro study/ Zona de risco em molares inferiores previamente a instrumentação: estudo "in vitro"  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese O objetivo deste estudo foi medir as zonas de risco de raízes mesiais de molares inferiores, demonstrando porque perfurações radiculares podem ocorrer durante o preparo do sistema de canais radiculares. Cem raízes mesiais de molares inferiores foram seccionadas horizontalmente 2mm abaixo da bifurcação e as concavidades distais foram medidas com o auxílio de um microscópio, desde a borda dos canais até a superfície externa da raiz. A espessura média para as zona (more) s de risco das raízes mesiais foi 0,789 +/- 0,182 mm. Não houve diferença estatística significante entre as medidas das zonas de risco nos canais mésio-vestibulares e mésio-linguais de molares inferiores. Abstract in english The aim of this work was to measure the danger zone in mandibular molars, relating to strip perforations that might affect the mesial root during canal instrumentation. One hundred mesial roots were sectioned 2mm below the furcation and the distal concavities were measured with a microscope from the border of the canals to the outer dentin of the root. The average thickness of the danger zone of the mesial roots was 0.789 +/- 0.182mm. No significant statistical differences were observed comparing the danger zone of mesiobuccal and mesiolingual canals.

Garcia Filho, Paulo Ferreira; Letra, Ariadne; Menezes, Renato; Carmo, Antônio Márcio Rezende do

2003-12-01

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Danger zone in mandibular molars before instrumentation: an in vitro study Zona de risco em molares inferiores previamente a instrumentação: estudo "in vitro"  

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Full Text Available The aim of this work was to measure the danger zone in mandibular molars, relating to strip perforations that might affect the mesial root during canal instrumentation. One hundred mesial roots were sectioned 2mm below the furcation and the distal concavities were measured with a microscope from the border of the canals to the outer dentin of the root. The average thickness of the danger zone of the mesial roots was 0.789 +/- 0.182mm. No significant statistical differences were observed comparing the danger zone of mesiobuccal and mesiolingual canals.O objetivo deste estudo foi medir as zonas de risco de raízes mesiais de molares inferiores, demonstrando porque perfurações radiculares podem ocorrer durante o preparo do sistema de canais radiculares. Cem raízes mesiais de molares inferiores foram seccionadas horizontalmente 2mm abaixo da bifurcação e as concavidades distais foram medidas com o auxílio de um microscópio, desde a borda dos canais até a superfície externa da raiz. A espessura média para as zonas de risco das raízes mesiais foi 0,789 +/- 0,182 mm. Não houve diferença estatística significante entre as medidas das zonas de risco nos canais mésio-vestibulares e mésio-linguais de molares inferiores.

Paulo Ferreira Garcia Filho; Ariadne Letra; Renato Menezes; Antônio Márcio Rezende do Carmo

2003-01-01

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Má oclusão de Classe I com biprotrusão e ausência dos primeiros molares inferiores Angle Class I malocclusion with bimaxillary dental protrusion and missing mandibular first molars  

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Full Text Available O presente relato de caso descreve o tratamento ortodôntico de uma paciente de 24 anos de idade, portadora de má oclusão de Classe I de Angle, com protrusão dos incisivos superiores e inferiores, além de perda recente dos primeiros molares inferiores. O tratamento idealizado envolveu a exodontia dos primeiros pré-molares superiores, aliada ao fechamento dos espaços presentes na arcada inferior. O resultado obtido demonstra a necessidade de planos de tratamento individualizados e a importância dos conceitos biomecânicos para movimentar adequadamente os dentes. Esse caso clínico foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO), representando a categoria livre escolha, como parte dos requisitos para obtenção do título de Diplomado pelo BBO.This case report describes the orthodontic treatment of a 24-year-old patient presenting with Angle Class I malocclusion, bimaxillary dental protrusion and recent loss of mandibular molars. Treatment involved extraction of the maxillary first premolars and closing of mandibular first molar spaces. Treatment outcomes demonstrate the need for individualized treatment planning and highlight the key role played by biomechanical concepts in achieving proper orthodontic tooth movement. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) as representative of the free choice category in partial fulfillment of the requirements for obtaining the BBO Diploma.

Aldino Puppin Filho

2011-01-01

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Má oclusão de Classe I com biprotrusão e ausência dos primeiros molares inferiores/ Angle Class I malocclusion with bimaxillary dental protrusion and missing mandibular first molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese O presente relato de caso descreve o tratamento ortodôntico de uma paciente de 24 anos de idade, portadora de má oclusão de Classe I de Angle, com protrusão dos incisivos superiores e inferiores, além de perda recente dos primeiros molares inferiores. O tratamento idealizado envolveu a exodontia dos primeiros pré-molares superiores, aliada ao fechamento dos espaços presentes na arcada inferior. O resultado obtido demonstra a necessidade de planos de tratamento indi (more) vidualizados e a importância dos conceitos biomecânicos para movimentar adequadamente os dentes. Esse caso clínico foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO), representando a categoria livre escolha, como parte dos requisitos para obtenção do título de Diplomado pelo BBO. Abstract in english This case report describes the orthodontic treatment of a 24-year-old patient presenting with Angle Class I malocclusion, bimaxillary dental protrusion and recent loss of mandibular molars. Treatment involved extraction of the maxillary first premolars and closing of mandibular first molar spaces. Treatment outcomes demonstrate the need for individualized treatment planning and highlight the key role played by biomechanical concepts in achieving proper orthodontic tooth m (more) ovement. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) as representative of the free choice category in partial fulfillment of the requirements for obtaining the BBO Diploma.

Puppin Filho, Aldino

2011-12-01

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Oral vs intravenous paracetamol for lower third molar extractions under general anaesthesia: is oral administration inferior?  

UK PubMed Central (United Kingdom)

BACKGROUND: Paracetamol formulations provide effective analgesia after surgery [Duggan ST, Scott LJ. Intravenous paracetamol (acetominophen). Drugs 2009; 69: 101-13; Toms L, McQuay HJ, Derry S, Moore RA. Single dose oral paracetamol (acetaminophen) for postoperative pain in adults. Cochrane Database Syst Rev 2008: CD004602]. I.V. paracetamol is superior to oral for pain rescue (Jarde O, Boccard E. Parenteral versus oral route increases paracetamol efficacy. Clin Drug Invest 1997; 14: 474-81). By randomized, double-blinded trial, we aimed to determine whether preoperative oral paracetamol provides inferior postoperative analgesia to preoperative i.v. paracetamol. METHODS: One hundred and thirty participants received either oral paracetamol and i.v. placebo (Group OP), or oral placebo and i.v. paracetamol (Perfalgan™) (Group IP). Oral preparations were given at least 45 min before surgery; i.v. preparations after induction of anaesthesia. Pain was assessed by a 100 mm visual analogue scale (VAS) 1 h from the end of surgery. Rescue analgesia was given on request. RESULTS: A total of 128 patients completed the study. There were no significant differences in baseline characteristics or intraoperative variables between the groups. The study was designed to reveal whether OP is inferior to IP, with an inferiority margin of 20%. The number of patients reporting satisfactory analgesia at 1 h with VAS ? 30 mm were 15 (OP) and 17 (IP), respectively. The secondary outcome measure of the mean (standard deviation) VAS (mm) for the whole of each group was 52 (22) for OP and 47 (22) for IP. Analysis of confidence intervals indicates that oral paracetamol is not inferior to i.v. paracetamol. The median survival (90% CI) to rescue analgesia request was 54.3 (51.2-57.4) min in Group OP and 57.3 (55.4-59.2) min in Group IP; there was no significant difference in this measure. CONCLUSIONS: In this study of lower third molar extraction, oral paracetamol is not inferior to i.v. for postoperative analgesia. ISRCTN Registration http://www.controlled-trials.com/ISRCTN77607163.

Fenlon S; Collyer J; Giles J; Bidd H; Lees M; Nicholson J; Dulai R; Hankins M; Edelman N

2013-03-01

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Variations of interleukin-6 after surgical removal of lower third molars/ Variaciones de la interleuquina-6 tras la cirugía del tercer molar inferior  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Objetivos: Determinar si tras la cirugía del tercer molar inferior se produce una liberación de interleuquina-6 (IL-6) y comparar la cantidad de IL-6 en pacientes que tomaron AINES y en aquellos que tomaron glucocorticoides. Diseño del estudio: Estudio prospectivo sobre 73 pacientes sometidos a la extracción quirúrgica de los terceros molares inferiores. Fueron divididos en dos grupos: De diclofenaco y de metilprednisolona. Se recogieron muestras de fluído crevicula (more) r gingival para valorar la liberación de interleuquina-6 tras la cirugía. Se usó el programa estadístico BMDP para hacer un amplio tratamiento de los datos. Resultados: Los niveles de IL-6 se elevaron tras la cirugía del tercer molar inferior permaneciendo elevados al séptimo día del postoperatorio, elevándose más a las 24 horas en el grupo de diclofenaco siendo esta diferencia significativa (0,008). Conclusiones: La IL-6 se eleva tras la cirugía del tercer molar inferior, presentando diferente comportamiento en los dos grupos de estudio. Abstract in english Objectives: To determine if there is a release of IL-6 after surgical removal of lower third molars and to compare the amount of IL-6 in patients treated with NSAID and in those treated with glucocorticoids. Study Design: Prospective study on 73 patients who attended the Oral Surgery Unit (Department of Medicine and Oral Surgery) in the Faculty of Odontology of the Universidad Complutense de Madrid for the surgical removal of their lower third molars. These patients were (more) separated into two groups: the diclofenac group and the methylprednisolone group. A record card was completed with preoperative and postoperative epidemiological and clinic data. Samples of gingival crevicular fluid were collected in order to assess the release of interleukin-6 after surgery. In order to make a broad study of data, the BMDP program was used for statistical analysis. Results: Levels of IL-6 were higher after surgical extraction of lower third molars and remained high until the seventh day after. Levels were higher in the diclofenac group 24 hours after surgery, the difference was significant (0.008). Conclusions: IL-6 is higher after surgical extraction of lower third molars, behaving differently in each of the groups.

López Carriches, Carmen; Martínez-González, José Mª; Donado Rodríguez, Manuel

2006-12-01

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Evaluation of the anatomical alterations of lower molars mesial root’s apical third Avaliação das alterações anatômicas do terço apical da raiz mesial de molares inferiores  

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Full Text Available The anatomical apex of the mesial root of the lower molars presents a morphological complexity related to the number and shape of the root canals as well as of the apical foramen and isthmus presence. The knowledge of the complexity of the endodontic system of the molar root area is essencial to select more carefully the best instrumentation and obturation technique, to obtain a more successful endodontic therapy.A presente pesquisa analisa in vitro as alterações anatômicas dos 4 mm apicais de 68 raízes mesiais de molares inferiores permanentes humanos, utilizando-se de microscópio esterioscópio. Cada raiz foi incluida em bloco de resina acrílica autopolimerizável, cortada transversalmente à partir de 1 mm apical obtendo-se 4 cortes em sentido cervical. Os resultados demonstraram a complexidade anatômica do terço apical da raiz mesial dos molares inferiores, com a presença de um ou dois canais radiculares. Quando da presença de dois canais radiculares estes podem apresenta-se totalmente independentes em toda extensão da raiz ou unirem-se em diferentes níveis para terminar em canal único. Verificou-se presença de istmo entre os canais mesio-vestibular e mesio-lingual. Em raízes com canal único, observou-se a alteração da forma do canal a medida que se aproxima do extremo apical.

Izabel Cristina FRÖNER; Cristina Aparecida IMPERADOR; Luiz Gustavo de SOUZA

1999-01-01

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Evaluation of accessory furcation canals of permanent mandibular molars using radiography and clearing =Avaliação do canal cavo-interradicular em molares inferiores permanentes através de Rx e diafanização  

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Full Text Available Objetivo: Avaliar a presença do canal cavo-interradicular em molares inferiores permanentes através de radiografias e diafanização. Metodologia: A amostra foi constituída por 344 molares inferiores re-hidratados, preparados e armazenados individualmente em recipientes de vidro. A presença do canal cavo-interradicular foi investigada por um único operador treinado usando lupa (4x) para as radiografias e microscópio óptico odontológico (30x) para as amostras diafanizadas. Microscopia eletrônica de varredura (MEV) foi usada para verificar diferenças morfológicas do assoalho pulpar. Resultados: A análise radiográfica mostrou que 9% das amostras tinham uma zona levemente radiolúcida, 2% mostravam uma imagem sugestiva, e 89% das amostras não tinham nenhuma evidência. Pela diafanização, o canal não foi encontrado nas amostras avaliadas. Pela MEV, as amostras recém extraídas mostraram com canalículos dentinários uniformes; as demais apresentaram pequenos sítios com canalículos uniformes. Conclusão: O exame radiográfico não foi o melhor método de diagnóstico; a diafanização é um excelente método avaliativo, pois permite a visualização tridimensional da anatomia interna dental em pesquisas in vitro. Purpose: To evaluate the presence of furcation canals of permanent mandibular teeth using radiography and a clearing technique. Methods: The sample comprised 344 extracted mandibular molars. The presence of furcation canals was assessed by a single trained observer using magnifying lens (4x) for the dental radiographs and a dental optical microscope (30x) for the cleared specimens. Scanning electron microscopy (SEM) was used to evaluate morphological differences in the pulp chamber floor. Results: Radiographs showed that 9% of the specimens had radiolucent areas, 2% had an image that suggested a canal, and 89% had no abnormal findings. Clearing techniques did not show any accessory canal. SEM images revealed dentin tubules in recently extracted teeth; the other specimens had small areas with dentin tubules. Conclusion: Radiography was not better than the clearing technique to diagnose furcation canals. The clearing technique can provide three-dimensional visualization of the internal tooth anatomy for in vitro studies.

Harb, Leandro José Corrêa et al.

2010-01-01

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Evaluation of accessory furcation canals of permanent mandibular molars using radiography and clearing/ Avaliação do canal cavo-interradicular em molares inferiores permanentes através de Rx e diafanização  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Avaliar a presença do canal cavo-interradicular em molares inferiores permanentes através de radiografias e diafanização. METODOLOGIA: A amostra foi constituída por 344 molares inferiores re-hidratados, preparados e armazenados individualmente em recipientes de vidro. A presença do canal cavo-interradicular foi investigada por um único operador treinado usando lupa (4x) para as radiografias e microscópio óptico odontológico (30x) para as amostras diafa (more) nizadas. Microscopia eletrônica de varredura (MEV) foi usada para verificar diferenças morfológicas do assoalho pulpar. RESULTADOS: A análise radiográfica mostrou que 9% das amostras tinham uma zona levemente radiolúcida, 2% mostravam uma imagem sugestiva, e 89% das amostras não tinham nenhuma evidência. Pela diafanização, o canal não foi encontrado nas amostras avaliadas. Pela MEV, as amostras recém extraídas mostraram com canalículos dentinários uniformes; as demais apresentaram pequenos sítios com canalículos uniformes. CONCLUSÃO: O exame radiográfico não foi o melhor método de diagnóstico; a diafanização é um excelente método avaliativo, pois permite a visualização tridimensional da anatomia interna dental em pesquisas in vitro. Abstract in english PURPOSE: To evaluate the presence of furcation canals of permanent mandibular teeth using radiography and a clearing technique. METHODS: The sample comprised 344 extracted mandibular molars. The presence of furcation canals was assessed by a single trained observer using magnifying lens (4x) for the dental radiographs and a dental optical microscope (30x) for the cleared specimens. Scanning electron microscopy (SEM) was used to evaluate morphological differences in the pu (more) lp chamber floor. RESULTS: Radiographs showed that 9% of the specimens had radiolucent areas, 2% had an image that suggested a canal, and 89% had no abnormal findings. Clearing techniques did not show any accessory canal. SEM images revealed dentin tubules in recently extracted teeth; the other specimens had small areas with dentin tubules. CONCLUSION: Radiography was not better than the clearing technique to diagnose furcation canals. The clearing technique can provide three-dimensional visualization of the internal tooth anatomy for in vitro studies.

Harb, Leandro José Corrêa; Ramos, Fernanda Lavarda; Pires, Carine Weber; Carvalho, Maria Gabriela Pereira de; Braun, Katia Olmedo

2010-12-01

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A rare case of unerupted second deciduous molar located inferior to the second premolar: case report.  

UK PubMed Central (United Kingdom)

AIM: Tooth eruption is defined as the movement of a tooth from its site of development within the alveolar process to its functional position in the oral cavity [Massler et al., 1941]. The process of tooth eruption can be divided into different phases: pre-eruptive bone stage, alveolar bone stage, mucosal stage, preocclusal stage, occlusal stage and maturation stage [Andreasen et al., 1997]. Any disturbance in these phases can lead to eruptive anomalies. The incidence of unerupted teeth is usually higher among permanent teeth than among deciduous ones [Walker et al., 2004; Otsuka et al., 2001; Amir et al., 1982; Broadway, 1976; Pinborg et al., 1970]. Of the primary teeth reported as unerupted, second primary molars are the teeth most frequently involved [Walker et al., 2004; Otsuka et al., 2001; Bianchi et al., 1991; Ranta et al., 1988; Tsukamoto et al., 1986; Amir et al., 1982], followed by primary central incisors [Otsuka et al., 2001]. CASE REPORT: This paper presents a case of inversion of the intraosseous position of a second unerupted deciduous molar and the succedaneous second premolar.

Ferro R; Besostri A; Stellini E; Denotti G; Canesso A

2012-09-01

 
 
 
 
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Distalização de segundo molar inferior impactado através da utilização de ancoragem esquelética com miniplaca: relato de caso Distalization of impacted mandibular second molar using miniplates for skeletal anchorage: case report  

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Full Text Available O presente estudo consiste no relato de um caso onde a distalização do segundo molar inferior impactado do lado direito foi obtida através da ancoragem esquelética com o uso de miniplaca. A verticalização dos segundos molares inferiores impactados, durante muito tempo, colocou-se como um grande desafio para ortodontistas e cirurgiões bucais devido à escassez de recursos de ancoragem destinados para esse fim. A utilização da ancoragem esquelética foi iniciada na clínica ortodôntica em meados dos anos 80 e, desde então, diversas modalidades têm sido desenvolvidas para esse princípio, como a utilização de mini-implantes, implantes dentários e, finalmente, miniplacas, que foram testadas e apresentaram resultados animadores. O assunto é relevante para ortodontistas e cirurgiões bucais, uma vez que o uso das miniplacas pode influir de forma significativa no tratamento de molares inferiores impactados.This study describes a case with an impacted right mandibular second molar which was distalized using miniplates for skeletal anchorage. Uprighting impacted mandibular second molars has been a great challenge for orthodontists and oral surgeons because of the scarcity of anchorage options. Skeletal anchorage was first used in clinical orthodontics in the middle of the 1980s. Since then, several devices have been developed for that purpose, such as mini-screws, tooth implants and, lately, miniplates, which have been tested and showed encouraging results. This topic is relevant for orthodontists and oral surgeons because the use of miniplates may significantly change the treatment of impacted mandibular molars.

Belini Freire-Maia; Tarcísio Junqueira Pereira; Marina Parreira Ribeiro

2011-01-01

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Distalização de segundo molar inferior impactado através da utilização de ancoragem esquelética com miniplaca: relato de caso/ Distalization of impacted mandibular second molar using miniplates for skeletal anchorage: case report  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese O presente estudo consiste no relato de um caso onde a distalização do segundo molar inferior impactado do lado direito foi obtida através da ancoragem esquelética com o uso de miniplaca. A verticalização dos segundos molares inferiores impactados, durante muito tempo, colocou-se como um grande desafio para ortodontistas e cirurgiões bucais devido à escassez de recursos de ancoragem destinados para esse fim. A utilização da ancoragem esquelética foi iniciada na (more) clínica ortodôntica em meados dos anos 80 e, desde então, diversas modalidades têm sido desenvolvidas para esse princípio, como a utilização de mini-implantes, implantes dentários e, finalmente, miniplacas, que foram testadas e apresentaram resultados animadores. O assunto é relevante para ortodontistas e cirurgiões bucais, uma vez que o uso das miniplacas pode influir de forma significativa no tratamento de molares inferiores impactados. Abstract in english This study describes a case with an impacted right mandibular second molar which was distalized using miniplates for skeletal anchorage. Uprighting impacted mandibular second molars has been a great challenge for orthodontists and oral surgeons because of the scarcity of anchorage options. Skeletal anchorage was first used in clinical orthodontics in the middle of the 1980s. Since then, several devices have been developed for that purpose, such as mini-screws, tooth impla (more) nts and, lately, miniplates, which have been tested and showed encouraging results. This topic is relevant for orthodontists and oral surgeons because the use of miniplates may significantly change the treatment of impacted mandibular molars.

Freire-Maia, Belini; Pereira, Tarcísio Junqueira; Ribeiro, Marina Parreira

2011-08-01

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A influência da perda bilateral do primeiro molar inferior permanente na morfologia dentofacial: um estudo cefalométrico The influence of bilateral lower first permanent molar loss on dentofacial morfology: a cephalometric study  

Directory of Open Access Journals (Sweden)

Full Text Available OBJETIVO: avaliar as alterações cefalométricas em pacientes com perda bilateral do primeiro molar inferior permanente. MÉTODOS: foram analisadas 68 telerradiografias laterais de pacientes de consultórios particulares. A amostra foi dividida em dois grupos pareados quanto ao sexo e idade - 34 indivíduos sem perdas (grupo controle) e 34 com perda bilateral do primeiro molar inferior permanente (grupo com perda). Foram excluídos da amostra pacientes que haviam perdido outros dentes que não o primeiro molar inferior, casos de agenesia e pacientes com menos de 16 anos de idade. Buscou-se avaliar somente indivíduos que tivessem relatado a perda há pelo menos 5 anos. RESULTADOS: demonstraram que a perda bilateral do primeiro molar inferior permanente leva ao suave fechamento do ângulo GnSN (P=0,05), um giro anti-horário do plano oclusal (P=0,0001), uma suave diminuição da altura facial anteroinferior (P=0,05), uma acentuada inclinação lingual (P=0,04) e retrusão dos incisivos inferiores (P=0,03). Por outro lado, a perda bilateral do primeiro molar inferior permanente não foi capaz de influenciar a relação maxilomandibular no sentido anteroposterior (P=0,21), a quantidade de mento (P=0,45), a inclinação dos incisivos superiores (P=0,12) e a posição anteroposterior dos incisivos superiores (P=0,46). CONCLUSÃO: a perda bilateral dos primeiros molares inferiores é capaz de produzir alterações marcantes no posicionamento dos incisivos inferiores e no plano oclusal, além de uma suave redução vertical da faceOBJECTIVE: To evaluate cephalometric changes in patients after bilateral loss of lower first permanent molar teeth. METHODS: Sixty-eight lateral radiographs of patients from private practices were analyzed. The sample was divided into two groups matched for age and gender: 34 individuals without loss (control group) and 34 presenting with bilateral loss of lower first permanent molar teeth (loss group). Patients who had lost teeth other than first molars, cases of agenesis and patients under 16 years of age were excluded from the sample. Only individuals who reported losing teeth at least 5 years earlier were evaluated. RESULTS: It was found that bilateral loss of lower first permanent molars leads to smooth closure of GnSN angle (P=0.05), counterclockwise rotation of occlusal plane (P=0.0001), mild decrease in lower anterior face height (P=0.05), pronounced lingual tipping (P=0.04) and retrusion of mandibular incisors (P=0.03). Moreover, bilateral loss of lower first permanent molars did not affect the maxillomandibular relationship in the anteroposterior direction (P=0.21), amount of treatment (P=0.45), inclination of upper incisors (P=0.12) and anteroposterior position of maxillary incisors (P=0.46). CONCLUSION: Bilateral loss of lower first molars can produce marked changes in lower incisor positioning and in the occlusal plane as well as a mild reduction of the face in the vertical direction

David Normando; Cristina Cavacami

2010-01-01

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Eficacia analgésica de diclofenaco versus metilprednisolona en el control del dolor postoperatorio tras la cirugía del tercer molar inferior/ Analgesic efficacy of diclofenac versus methylprednisolone in the control of postoperative pain after surgical removal of lower third molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Objetivo: Comparar la eficacia analgésica de la metilprednisolona (corticoide) versus diclofenaco (antiinflamatorio no esteroideo-AINE-) tras la cirugía del tercer molar inferior. Diseño del estudio: Estudio prospectivo sobre 73 pacientes sometidos a la extracción quirúrgica de los terceros molares inferiores. Fueron divididos de forma aleatoria en dos grupos: De diclofenaco y de metilprednisolona. Se cumplimentó una ficha donde se hizo constar los datos epidemioló (more) gicos y clínicos preoperatorios y postoperatorios. La valoración del dolor se hizo mediante escala visual analógica y semicuantitativa y número de analgésicos de rescate consumidos. El control del dolor se hizo en la primera hora, a las 8 horas, 24 horas, 48 y 72 horas. Se usó el programa estadístico BMDP para hacer un amplio tratamiento de los datos. Resultados: En el dolor reflejado por los pacientes en la escala visual analógica no hubo diferencias de conjunto entre los dos grupos (aunque sí las hubo en ciertos momentos). Tampoco hubo diferencias en el número de analgésicos de rescate consumidos. Conclusiones. La reducción del dolor que se consigue con el corticoide no es significativa por lo que no está justificado su uso rutinario. Abstract in english Objetive: To compare the analgesic efficacy of methylprednisolone (corticoid) versus diclofenac (nonsteroidal antiinflammatory-NSAID-) after surgical removal of lower third molars. Study Design: Prospective study on 73 patients for the surgical removal of their lower third molars. These patients were separated in two groups at random: a diclofenac group and a methylprednisolone group. A record card was filled in with preoperative and postoperative epidemiological and clin (more) ic data. The pain level assessment was made on a semiquantitative and an analogical visual scales and in relation to the amount of rescue analgesics consumed. Pain levels were measured at 1, 8, 24, 48 and 72 hours. In order to make a broad study of data, BMDP program was used for statistics. Results: In the pain described by patients in the analogical visual scale there were no differences between groups as a whole. There were no differences in the amount of rescue analgesics consumed. Conclusions. There is less pain in the corticoid group but not as to justify its routine use.

López Carriches, Carmen; Martínez-González, José Mª; Donado Rodríguez, Manuel

2005-12-01

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Biometric study of the width, length and depth of the root trunk groove of human lower second molars/ Estudo biométrico da largura, comprimento e profundidade da pre-furca dos segundos molares inferiores de humanos  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Foram obtidos 100 dentes, segundos molares inferiores (51 esquerdos e 49 direitos) extraídos de humanos quando diagnosticados como condenados (extração indicada). Por meio de um aparelho Contracer foram traçados, em papel milimetrado, os perfis das faces vestibulares e linguais dos 100 dentes em estudo. Estes perfis foram registrados a partir do limite amelocementário, de milímetro em milímetro, até que atingíssemos a entrada da furca. Foram realizadas medidas da (more) largura, comprimento e profundidade da região da pré-furca, assim como o comprimento do tronco radicular. Após a análise estatística (p Abstract in english One hundred human lower second molars, 51 from the left side and 49 from the right side, extracted due to their poor clinical and radiographic conditions were utilized in this study. Using a Contracer apparatus, the profiles of the buccal and lingual root surfaces of these teeth were traced on a millimeter-scaled paper. The profiles were registered from the cementoenamel junction (CEJ), millimeter by millimeter, up to the entrance of the furcation. The width, length and d (more) epth of the root trunk groove, as well as the length of the root trunk, were studied. After statistical analysis (p

RIOS, Constanza Marin de los; PUSTIGLIONI, Francisco Emílio; ROMITO, Giuseppe Alexandre

2002-03-01

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Comparative study of the anesthetic efficacy of 4% articaine versus 2% lidocaine in inferior alveolar nerve block during surgical extraction of impacted lower third molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Objetivo: Valorar y comparar la eficacia anestésica de la Articaína al 4% respecto a la Lidocaína al 2%, ambas con una concentración de 1:100.000 de epinefrina en el bloqueo troncal del nervio alveolar inferior durante la extracción quirúrgica de terceros molares inferiores incluidos. Diseño del estudio: Se realizó un ensayo clínico aleatorio a doble ciego en una muestra de 30 pacientes programados para las extracciones quirúrgicas bilaterales de terceros molare (more) s inferiores simétricos en el Servicio de Cirugía Bucal del Máster de Cirugía e Implantología Bucal de la Universidad de Barcelona. Previo consentimiento del paciente, dos operadores efectuaron las intervenciones quirúrgicas de forma extemporánea, utilizando como anestésico local la Articaína al 4% o la Lidocaína al 2 % con la misma concentración de vasoconstrictor (epinefrina 1:100.000). Las variables estudiadas para cada anestésico fueron: tiempo de latencia (o de inicio del efecto anestésico), duración del efecto anestésico, cantidad de solución anestésica utilizada y la necesidad de reanestesiar la zona operatoria. Se utilizó una escala analógica visual para valorar la cantidad de dolor experimentado durante el acto quirúrgico y, así, evaluar subjetivamente la profundidad anestésica de las dos soluciones. Resultados: Se observaron diferencias estadísticamente significativas (p= .003) en cuanto a la duración del efecto anestésico, que fue mayor para la artcaína al 4% (220,8 minutos), respecto a la lidocaína al 2% (168,20 minutos). En las variables tiempo de latencia, cantidad de solución anestésica utilizada y necesidad de reanestesiar el campo operatorio se evidenciaron diferencias clínicas a favor de la articaína, aunque estas diferencias no fueron estadísticamente significativas. La valoración cualitativa de los anestésicos mediante la escala analógica visual mostró similitud en el dolor experimentado por los pacientes con ambos anestésicos. Conclusiones: De acuerdo con los resultados obtenidos se puede afirmar que la articaína al 4% muestra mejores características clínicas que la lidocaína al 2%, especialmente en cuanto al tiempo de latencia y duración del efecto anestésico. Sin embargo, no hubieron diferencias estadísticamente significativas que confirmen la superioridad de una solución respecto a la otra, al valorar la eficacia anestésica. Abstract in english Background: A comparative study is made of the anesthetic efficacy of 4% articaine versus 2% lidocaine, both with epinephrine 1:100,000, in truncal block of the inferior alveolar nerve during the surgical extraction of impacted lower third molars. Study design: A randomized double-blind clinical trial was conducted of 30 patients programmed for the bilateral surgical extraction of symmetrical lower third molars in the context of the Master of Oral Surgery and Implantology (more) (University of Barcelona, Barcelona, Spain). Following the obtainment of informed consent, two operators performed surgery on an extemporaneous basis, using as local anesthetic 4% articaine or 2% lidocaine with the same concentration of vasoconstrictor (epinephrine 1:100,000). The study variables for each anesthetic were: latency (time to action) and duration of anesthetic effect, the amount of anesthetic solution used, and the need of re-anesthetize the surgical zone. A visual analog scale was used to assess pain during surgery, and thus subjectively evaluate the anesthetic efficacy of the two solutions. Results: Statistically significant differences (p = 0.003) were observed in the mean duration of anesthetic effect (220.86 min. for 4% articaine vs. 168.20 min. for 2% lidocaine). Latency, the amount of anesthetic solution and the need to re-anesthetize the surgical field showed clinical differences in favor of articaine, though statistical significance was not reached. The pain scores indicated similar anesthetic efficacy with both solutions. Conclusions: The results obtained suggest that 4% articaine offers better clinic

Sierra Rebolledo, Alejandro; Delgado Molina, Esther; Berini Aytés, Leonardo; Gay Escoda, Cosme

2007-03-01

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Antibioterapia sistémica preventiva de la alveolitis seca en la exodoncia del tercer molar inferior: revisión sistemática/ Systemic antibiotherapy in the prevention of dry socket in lower third molar exodontia: systematic review  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Introducción: El objetivo de esta revisión sistemática es responder a la pregunta: ¿son eficaces los antibióticos sistémicos en la cirugía del tercer molar inferior para reducir la frecuencia de alveolitis seca?. Método: Búsqueda bibliográfica, sin limitaciones, en repertorios y bases de datos informáticas. Criterios inclusión: exposición (antibioterapia sistémica), efecto (alveolitis seca) y diseño (ensayos clínicos aleatorizados- evidencia I). Se evaluar (more) on la validez de los estudios primarios según la síntesis de la mejor evidencia disponible (escala Jadad) y los componentes individuales. De los ensayos seleccionados se verificó la validez externa de sus conclusiones. Resultados: Once ensayos clínicos cumplían los criterios de inclusión y obtuvieron puntuación = 1 en la escala de Jadad. En ninguno de los estudios se realizó análisis por intención de tratar. Sólo en uno se analizó la potencia y cálculo previo del tamaño muestral, y en dos el intervalo de confianza. Conclusión: No existe evidencia a favor o en contra de la eficacia de la antibioterapia sistémica preventiva en la exodoncia de los cordales inferiores. Abstract in english Introduction: The objective of this systematic review is to provide an answer to the question: Is the frequency of dry socket in lower third molar surgery reduced with efficacy using systemic antibiotics?. Method: Unlimited bibliographic search in repertories and computer databases. Inclusion criteria: exposure (systemic antibiotherapy), effect (dry socket) and design (randomised clinical trials -evidence I-). Validity of the preliminary studies was assessed according to (more) the synthesis of the best available evidence (Jadad scale) and individual components. From the trials chosen, the external validity of their conclusions was verified. Results: Eleven clinical trials complied with the inclusion criteria obtaining = 1 points on the Jadad scale. Intention to treat analysis was not performed on any of the studies. Power analysis and preliminary calculation of the sample size was performed on only one, whereas the confidence interval was performed on two. Conclusion: There is no evidence for or against the efficacy of systemic preventive antibiotherapy in lower third molar exodontia.

Arteagoitia Calvo, María Iciar; Diez García, María Antonia; Barbier Herrero, Luis; Landa Llona, Salvador; Santamaría Arrieta, Gorka; Santamaría Zuazua, Joseba

2002-12-01

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Anaesthetic efficacy of supplemental lingual infiltration of mandibular molars after inferior alveolar nerve block plus buccal infiltration in patients with irreversible pulpitis.  

UK PubMed Central (United Kingdom)

AIM: To investigate the effect of supplemental lingual infiltration (LI) of mandibular molars following an inferior alveolar nerve block (IANB) plus buccal infiltration (BI) in patients with irreversible pulpitis. METHODOLOGY: Eighty adult patients diagnosed with irreversible pulpitis participated in this prospective study. All patients received standard IANB via injection of 4 mL of 2% lidocaine with 1 : 100,000 epinephrine. Ten minutes after the IANB, patients with numbness of the lower lip were randomly divided into two groups. In the BI group, 40 patients received supplemental BI of 0.9 mL of 4% articaine with 1 : 100,000 epinephrine. In the buccal plus lingual infiltration (BLI) group, 40 patients received supplemental BI of 0.9 mL of 4% articaine with 1 : 100,000 epinephrine and, subsequently, LIs with the same anaesthetic solution and dose. Endodontic access cavity preparation began 15 min after the IANB. Pain during treatment was recorded using a Heft-Parker visual analogue scale. Success was defined when pain was 'none' or 'mild' on endodontic access and initial instrumentation. The pain was estimated and statistically analysed by the chi-squared test (? = 0.05). RESULTS: The success rates for the BI and BLI groups were 70% and 62.5%, respectively. No statistical difference was found between the two groups (P = 0.478). CONCLUSIONS: Supplemental LIs are not recommended for administration in mandibular molars with irreversible pulpitis, because they do not improve the anaesthetic success after IANB plus BI.

Dou L; Luo J; Yang D

2013-07-01

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One-year results of vital pulp therapy in permanent molars with irreversible pulpitis: an ongoing multicenter, randomized, non-inferiority clinical trial.  

UK PubMed Central (United Kingdom)

OBJECTIVES: Root canal therapy (RCT) and tooth extraction have been conventional treatment options for management of human mature teeth with irreversible pulpitis. Excellent short-term treatment outcomes of vital pulp therapy with calcium-enriched mixture cement (VPT/CEM), as a new treatment option, on postoperative pain relief was demonstrated; if intermediate- and long-term treatment outcomes of the new treatment are also non-inferior compared to RCT, then VPT/CEM may become a viable treatment option for management of mature teeth with irreversible pulpitis. MATERIALS AND METHODS: In 23 healthcare centers, 407 9- to 65-year-old patients were randomly allocated into two study arms including one-visit RCT (reference treatment; n = 202) and VPT/CEM (alternative treatment; n = 205). Six- and twelve-month clinical and radiographic successes were assessed. RESULTS: Mean follow-up times at 6- and 12-month follow-ups were "6.70 ± 0.68 and 6.72 ± 0.71 months" and "12.96 ± 0.67 and 12.90 ± 0.66 months" in the available cases of RCT and VPT/CEM arms, respectively. Favorable clinical success rates in the two study arms did not show statistical difference; however, the radiographic success rate in the VPT/CEM was significantly greater than RCT arm at the two follow-ups (P < 0.001). The patients' age had no effect on the treatment outcomes (P = 0.231). CONCLUSIONS: Treatment outcomes of VPT/CEM may be superior to RCT in mature molars with irreversible pulpitis. The performance of biomaterials such CEM cement may assist in the shift towards more biologic treatments. CLINICAL RELEVANCE: VPT/CEM may be a realistic alternative treatment for human mature molar teeth with symptoms of irreversible pulpitis; the use of VPT/CEM is highly beneficial for patients as well as general dentists.

Asgary S; Eghbal MJ; Ghoddusi J; Yazdani S

2013-03-01

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Biometric study of the width, length and depth of the root trunk groove of human lower second molars Estudo biométrico da largura, comprimento e profundidade da pre-furca dos segundos molares inferiores de humanos  

Directory of Open Access Journals (Sweden)

Full Text Available One hundred human lower second molars, 51 from the left side and 49 from the right side, extracted due to their poor clinical and radiographic conditions were utilized in this study. Using a Contracer apparatus, the profiles of the buccal and lingual root surfaces of these teeth were traced on a millimeter-scaled paper. The profiles were registered from the cementoenamel junction (CEJ), millimeter by millimeter, up to the entrance of the furcation. The width, length and depth of the root trunk groove, as well as the length of the root trunk, were studied. After statistical analysis (p Foram obtidos 100 dentes, segundos molares inferiores (51 esquerdos e 49 direitos) extraídos de humanos quando diagnosticados como condenados (extração indicada). Por meio de um aparelho Contracer foram traçados, em papel milimetrado, os perfis das faces vestibulares e linguais dos 100 dentes em estudo. Estes perfis foram registrados a partir do limite amelocementário, de milímetro em milímetro, até que atingíssemos a entrada da furca. Foram realizadas medidas da largura, comprimento e profundidade da região da pré-furca, assim como o comprimento do tronco radicular. Após a análise estatística (p < 0,05), conclui-se que: a) a largura da pré-furca, na face vestibular, é de 3,6 mm e na face lingual 3,3 mm; b) a profundidade da pré-furca foi de 0,88 mm na face vestibular e 0,77 mm na face lingual; c) o comprimento da pré-furca na face vestibular foi de 2,93 mm e de 3,61 mm na face lingual. O comprimento do tronco radicular foi de 3,09 mm na face vestibular e de 3,91 mm na face lingual (p < 0,025). Houve uma coincidência do comprimento do tronco radicular e da pré-furca em 90,2% da amostra para a face vestibular no lado esquerdo e 77,5% no lado direito; para a face lingual, a coincidência ocorreu em 77,5 % dos casos no lado esquerdo e 88,3% no lado direito.

Constanza Marin de los RIOS; Francisco Emílio PUSTIGLIONI; Giuseppe Alexandre ROMITO

2002-01-01

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Avaliação da efetividade do laser de baixa potência na redução da dor pós-operatória em cirurgia de terceiros molares inferiores inclusos  

Directory of Open Access Journals (Sweden)

Full Text Available Objetivo: avaliar a efetividade do laser de baixa intensidade (LLLT) no controle da dor pós-operatória em cirurgia de terceiros molares inferiores inclusos, comparando-o com o lado oposto, que não foi exposto ao LLLT, no mesmo indivíduo. Metodologia: participaram do estudo 16 indivíduos, que apresentaram os dentes 38 e 48 inclusos, em posição similar, e que realizaram a remoção dos dentes no mesmo tempo cirúrgico. O laser foi aplicado imediatamente após a remoção do 48 (lado direito - LD), intra-alvéolo, de forma pontual e sobre a região da sutura, em varredura. O mesmo procedimento foi realizado no 38 (lado esquerdo - LE), com o aparelho desligado garantindo o desconhecimento do paciente sobre qual lado recebeu o laser. Todos foram medicados e orientados quanto aos cuidados pós-operatórios e receberam as escalas visuais análogas (VAS) que variavam de 0-10 cm, anotando a ausência ou presença da dor durante 5 dias do lado direito e esquerdo. Os dados foram tabulados e submetidos ao teste de Wilcoxon (p < 0,05) comparando-se as médias da VAS de 1 a 5 dias. Resultados: no 3° dia LD e LE, houve diferença estatística significante (p = 0,0284) e do LD a dor foi menor. No 1° e 5° dia houve redução da dor em ambos os lados (LD:p=0,007; LE:p=0,001). Conclusão: dentro dos limites do presente estudo o laser de baixa intensidade mostrou efetividade no controle da dor pós-operatória.

Juliane Wathier; Cintia Mussi Milani Contar; Luciana Reis Azevedo Alanis; Sérgio Aparecido Ignácio; Maria Ângela Naval Machado

2011-01-01

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Piecewise Straight Line Approximation of Curve Existing in Slightly Curved Mesiobuccal Root Canal of Mandibular First Molar: A Radiographic Investigation Aproximación a Segmentos de Línea Recta en la Curva Existente del Canal Radicular Mesiobucal Ligeramente Curvado del Primer Molar Inferior: Una Investigación Radiográfica  

Directory of Open Access Journals (Sweden)

Full Text Available The aim of this study was to radiographically investigate the curve existing in slightly curved mesiobuccal canal of mandibular first molar by applying Piecewise straight line approximation. Extracted human mandibular molars were radiographed and one hundred radiographs were selected whose mesiobuccal canal showed slight curvature (10-20°) according to Schneider's method. The curves were traced and analyzed using Piecewise straight line method. Each curve was considered as a unit consisting of six different pieces of straight lines joining at seven specific points and the angle of curvature at these points was determined using the slope formula. All curves analyzed in this study had varying degrees of curvatures at different points on the curve. Maximum curvature (0.40°) was recorded at the middle third of the root canal. Within the limitation of the study, significant curvature occurs through out the curve existing in the mesiobuccal canal of mandibular first molar and the middle third of the curve showing greater degree of curvature. There is a possibility of greater curvature occurring in the coronal third of the curve. Though three dimensional studies would be more appropriate, Piecewise straight line approximation may be a better method than existing methods to simulate canal geometry.El objetivo de este estudio fue investigar radiográficamente la curva existente en el canal radicular mesiobucal ligeramente curvado del primer molar inferior mediante la aplicación de aproximaciones a segmentos de línea recta. Se utilizaron molares inferiores humanos extraídos que fueron radiografiados. Fueron seleccionadas, según el método de Schneider, 100 radiografías cuyo canal mesiobucal mostró una ligera curvatura (10-20°). Las curvas fueron delineadas y analizadas mediante el método de aproximación a segmentos de línea recta. Cada curva se consideró como una unidad que consta de seis diferentes segmentos de línea recta que unen a siete puntos específicos y el ángulo de curvatura en estos puntos se determinó utilizando la fórmula de la pendiente. Todas las curvas analizadas en este estudio tenían diversos grados de curvaturas en diferentes puntos de la curva. La curvatura máxima (0,40°) se registró en el tercio medio del canal radicular. Dentro de la limitación del estudio, una curvatura significativa se produce a través de la curva existente en el canal mesiobucal del primer molar inferior y el tercio medio de la curva que muestra un mayor grado de curvatura. Existe la posibilidad que ocurra una mayor curvatura en el tercio coronal de la curva. Aunque un estudio tridimensional sería más apropiado, la aproximación a segmentos de línea recta puede ser un mejor método que los existentes para simular la geometría del canal.

J Prabhakar; M. S Priya; L. Jones Tarcius Doss; V. G Sukumaran

2013-01-01

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Cross-sectional tomography. A diagnostic technique for determining the buccolingual relationship of impacted mandibular third molars and the inferior alveolar neurovascular bundle.  

UK PubMed Central (United Kingdom)

Twenty-two patients with 31 impacted mandibular third molars were examined with a new, precise, cross-sectional tomographic technique to assess the radiographic size, shape, branching pattern, location, and degree of cortication of the mandibular canal, and the inclination of impacted mandibular third molars in the buccolingual plane. The mandibular canal, including bifid canals, was accurately identified in 30 cases (96.8%). The cross-sectional appearance of the canal was an uncorticated, or partially corticated, radiolucent oval that measured on average (+/- SD) 2.9 +/- 0.7 x 2.5 +/- 0.6 mm in diameter. It was located more frequently (45.2%) on the buccal aspect of the impacted mandibular third molar. About 60% of the mandibular canals notched the inner cortical plate of the mandible or the third molar root surface. Cystic expansion and quantification of cortical bone destruction were readily assessed by this technique. It was concluded that diagnostic information obtained from cross-sectional tomograms significantly aids the oral and maxillofacial surgeon during the preoperative diagnostic workup and that the radiation risks are comparable to those of other accepted localization techniques.

Miller CS; Nummikoski PV; Barnett DA; Langlais RP

1990-12-01

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Cross-sectional tomography. A diagnostic technique for determining the buccolingual relationship of impacted mandibular third molars and the inferior alveolar neurovascular bundle.  

Science.gov (United States)

Twenty-two patients with 31 impacted mandibular third molars were examined with a new, precise, cross-sectional tomographic technique to assess the radiographic size, shape, branching pattern, location, and degree of cortication of the mandibular canal, and the inclination of impacted mandibular third molars in the buccolingual plane. The mandibular canal, including bifid canals, was accurately identified in 30 cases (96.8%). The cross-sectional appearance of the canal was an uncorticated, or partially corticated, radiolucent oval that measured on average (+/- SD) 2.9 +/- 0.7 x 2.5 +/- 0.6 mm in diameter. It was located more frequently (45.2%) on the buccal aspect of the impacted mandibular third molar. About 60% of the mandibular canals notched the inner cortical plate of the mandible or the third molar root surface. Cystic expansion and quantification of cortical bone destruction were readily assessed by this technique. It was concluded that diagnostic information obtained from cross-sectional tomograms significantly aids the oral and maxillofacial surgeon during the preoperative diagnostic workup and that the radiation risks are comparable to those of other accepted localization techniques. PMID:2263343

Miller, C S; Nummikoski, P V; Barnett, D A; Langlais, R P

1990-12-01

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Uso de metilprednisolona versus diclofenaco en el control de la inflamación y el trismo tras la cirugía del tercer molar inferior/ The use of methylprednisolone versus diclofenac in the treatment of inflammation and trismus after surgical removal of lower third molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Objetivo: Comparar el efecto sobre la inflamación y el trismo de la metilprednisolona (corticoide) versus diclofenaco (antiinflamatorio no esteroideo-AINE-) tras la cirugía del tercer molar inferior. Diseño del estudio: Estudio prospectivo sobre 73 pacientes sometidos a la extracción quirúrgica de los terceros molares inferiores. Fueron divididos de forma aleatoria en dos grupos: De diclofenaco y de metilprednisolona. Se cumplimentó una ficha donde se hizo constar l (more) os datos epidemiológicos y clínicos preoperatorios y postoperatorios en relación a la inflamación y el trismo (tres medidas faciales y apertura bucal). Se usó el programa estadístico BMDP para hacer un amplio tratamiento de los datos. Resultados: A las 24 horas el grupo tratado con diclofenaco presentaba mayor inflamación en una de las medidas faciales (p Abstract in english Objective: To compare the efficacy of methylprednisolone (corticoid)versus diclofenac (nonsteroidal anti-inflammatory -NSAID-) in the treatment of inflammation and trismus after the surgical removal of lower third molars. Study design: Prospective study on 73 patients for the surgical removal of their lower third molars. These patients were separated in two groups at ramdom: the diclofenac group and the methylprednisolone group. A record card was filled in with preoperati (more) ve and postoperative epidemiological and clinic data about inflammation and trismus (three facial measures and mouth opening). In order to make a broad study of data, BMDP program was used for statistics. Results: 24 hours after surgery, patients in the diclofenac group showed a more severe inflammation in one of the facial measurements (p

López Carriches, Carmen; Martínez González, José Mª; Donado Rodríguez, Manuel

2006-09-01

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Impacção de primeiro molar permanente em paciente com fissura labiopalatina  

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Full Text Available O cisto paradentário é um cisto odontogênico inflamatório, relacionado a um dente vital, parcialmente irrompido, associado com pericoronarite. Geralmente acomete terceiros molares inferiores, podendo, mais raramente, ocorrer em outros dentes causando distúrbios na erupção. A impacção de primeiros molares permanentes inferiores é rara e poucos casos são relatados na literatura. O dente mais frequente a apresentar impacção é o terceiro molar permanente inferior, seguido do terceiro molar superior. Sua etiologia pode envolver tanto fatores locais como sistêmicos. Este trabalho tem como objetivo apresentar um caso de impacção de um primeiro molar permanente inferior causado pela presença de um cisto paradentário, bem como o tratamento realizado.

Ana Paula Fernandes; Cleide Felício Carvalho Carrara; Vivan Agostino Biella Passos; Natalino Lourenço Neto; Thais Marchini Oliveira

2011-01-01

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Inflammatory process decrease by gallium-aluminium-arsenide (GaAlAs) low intensity laser irradiation on postoperative extraction of impacted lower third molar; Reducao de processo inflamatorio com aplicacao de laser de arseneto de galio aluminio ({lambda}=830 nm) em pos-operatorio de exodontia de terceiros molares inferiores inclusos ou semi-inclusos  

Energy Technology Data Exchange (ETDEWEB)

This study aimed the observation of inflammatory process decrease by the use of GaAlAs Low Intensity Laser ({lambda}=830 nm; 40 mW) irradiation. Five patients were selected and submitted to surgery of impacted lower third molars, both right and left sides at different occasions. On a first stage, a tooth of a random chosen side - right or left - was extracted by conventional surgery, without LILT. The inflammatory process was measured at postoperative on the first, third and seventh days. This side was then called 'control side'. After 21 days, period in which the inflammatory process of the first surgery was terminated, the other side surgery took place, this time using LILT (4 J at four spots) at postoperative, first and third days. As the previous surgery, the inflammatory process was also measured at postoperative on the first, third and seventh days. This side was called 'experimental or lased side'. The inflammatory process was evaluated by measuring its four characteristic signs: swelling, pain, color and temperature. It was clearly observed a decrease for swelling, pain and color on the lased side which presented significant inference and descriptive statistics. It can be concluded that GaAlAs Low Intensity Laser ({lambda}=830 nm) can surely be used as an additional and important anti-inflammatory source on impacted lower third molar surgeries. (author)

Atihe, Mauricio Martins

2002-07-01

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Utilización de un bosque deciduo por bovinos a pastoreo/ Utilization of a deciduous forest by grazing bovines  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Con el objetivo de evaluar la utilización de un bosque deciduo por bovinos a pastoreo al noreste del estado Guárico, Venezuela, en los períodos seco y lluvioso del año 2007, se realizó un ensayo bajo un diseño factorial en bloques al azar. Para ello, se utilizaron vaquillas mestizas doble propósito con una presión de pastoreo de 6 kg MS/100 kg PV. Los tratamientos evaluados fueron tres modalidades de pastoreo: Pastoreo de pasto estrella (Cynodon nlemfuensis), Past (more) oreo de C. nlemfuensis con acceso restringido al bosque (5 h) y Pastoreo de C. nlemfuensis con libre acceso al bosque. La superficie utilizada para los tratamientos con bosque fue 2 ha. El período de ensayo fue 10 d/época. Se midió la utilización de materia seca de gramíneas, hojarasca, follaje de árboles y frutos caídos. No se encontraron diferencias significativas en la utilización del pasto entre los distintos tratamientos. No obstante, se observaron diferencias altamente significativas (P Abstract in english With the objective to evaluate the utilization of a deciduous forest by grazing bovines at northeast of Guarico state, Venezuela, in dry and rainy seasons in 2007, it was carried out an experiment with a factorial design with randomized blocks. For that, there were used mixed dual purpose heifers with a grazing pressure of 6 kg DM/100 kg LW. The evaluated treatments were three grazing conditions: OG: Grazing of star grass (Cynodon nlemfuensis), RAF: Grazing of C. nlemfuen (more) sis with restricted access to the forest (5 h) and OAF: Grazing of C. nlemfuensis with open access to the forest. The area used for the treatments with forest was 2 ha. Dry matter utilization of grasses, litter, tree foliage, and fallen fruits were measured. No significant differences were found for grass utilization among treatments. However, significant differences (P

Miliani, Tisbey; Espinoza, Freddy; Gil, José L; Baldizán, Alfredo; Diaz, Yris

2008-09-01

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[Hyperthyroidism in molar pregnancy.  

UK PubMed Central (United Kingdom)

INTRODUCTION: Hyperthyroidism is a rare complication of molar pregnancy. CASE REPORT: We report a 39-year-old woman who presented a thyrotoxic syndrome accompanying a molar pregnancy. Serum thyroid hormones were elevated and returned to normal level after uterine evacuation of a molar pregnancy. The authors detail the role of thyroid stimulating property of human gonadotropin chorionic hormone and its structural changes during the gestational trophoblastic diseases. These changes give the latter the thyroid stimulating properties and signs of hyperthyroidism. CONCLUSION: Molar pregnancy may be a cause of hyperthyroidism. The diagnosis of molar pregnancy should be a mention to thyrotoxicosique syndrome in a woman of childbearing age.

Boufettal H; Mahdoui S; Noun M; Hermas S; Samouh N

2013-09-01

40

Morfometría de Terceros Molares: un Estudio de 55 Casos/ Third Molar Morphometry: a Study of 55 Cases  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Los terceros molares son las piezas dentarias con mayor variación de forma, tamaño, número y posición. Se estudiaron 55 molares extraídos de pacientes de la ciudad de Temuco, Chile, los cuales se clasificaron por edad, género y ubicación en maxilares. Se midieron los siguientes parámetros: diámetro vestíbulo-palatino (V-P), mesio-distal (M-D), altura coronaria (C-O), longitud radicular y longitud total. Además, se cuantificaron número de raíces y cúspides pa (more) ra cada molar, identificando aquellos molares con anomalías de forma. Los datos fueron analizados estadísticamente y tabulados. Los resultados arrojaron que los molares superiores presentaron mayor longitud total que lo inferiores, donde predominó en ambos la forma unirradicular. En cuanto a la forma coronaria, se observó un predominio de la forma tricuspídea prevaleciendo el diámetro V-P para los superiores y tetracuspídea para los inferiores, donde destacó el diámetro M-D. La longitud coronaria fue mayor en los molares superiores, por el contrario de la longitud radicular la cual presentó un mayor valor para los molares inferiores. Abstract in english Third molars are the teeth with the highest variation of shape, size, number and position. Fifty five molars were extracted from patients of Temuco, Chile, which were classified by age, gender and location jaw. The following parameters were measured: vestibular-palatine diameter (VP), mesial-distal (MD) diameter, coronary height (C-O), root length and total length. Additionally, number of roots and cusps were quantified for each molar identifying those with abnormal molar (more) shape. The data were statistically analyzed and tabulated. The results showed that upper molars have higher total length than lower ones, predominating those with a one fused root. Regarding to crown shape, there was a predominance of tricuspid shape prevailing V-P diameter for upper third molars and tetracuspid for lower, noting M-D diameter. Coronary length was higher for upper molars, but root length was higher for lower molars than upper ones.

Fuentes F, Ramón; Borie E, Eduardo; Bustos M, Luis; Thomas M, David

2009-12-01

 
 
 
 
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Multiple Abnormal Unerupted Mandibular Permanent Molar Teeth: A Case Report/ Molares Mandibulares Anormales No-Erupcionados Múltiples: Reporte de un Caso  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Los molares permanentes anormales no erupcionados múltiples, además de otras anomalías del desarrollo de los dientes, desde hace tiempo han recibido atención de anatomistas y cirujanos maxilofaciales. Este artículo presenta un caso clínico de un paciente masculino de 23 años de edad, que fue admitido en el Departamento de Cirugía Maxilofacial de la Facultad de Odontología de la Escuela de Medicina Gulhane, con una historia de seis meses de dolor, en la posición (more) de descanso y durante la masticación, así como dolor en su cuerpo mandibular derecho. Fue encontrada la impactación que resulta de la falla en la erupción y la dislocación de la anatomía normal del desarrollo en tres molares mandibulares. En el examen extraoral fue definida asimetría facial del lado derecho. El diagnóstico de molares mandibulares anormales no erupcionados múltiples fue confirmado por radiografía panorámica e imágenes de tomografía 3D. El diente invertido no erupcionado fue el tercer molar que se encontró en la base de la mandíbula en el lado derecho. En el otro lado, el primer molar se posicionó sobre la base de la mandíbula distoangularmente. El segundo molar se encontró verticalmente en medio del cuerpo mandibular izquierdo. También, el tercer molar erupcionó mesioangularmente. La longitud del arco fue evaluada por el cirujano oral. La distancia mesio-distal entre los dientes fue suficiente. Las causas de impactación de los dientes permanentes podrían haber sido influenciadas por los factores locales, tales como la retención prolongada de dientes deciduos o gérmenes dentales malposicionados, pero no fueron provocados por deficiencia de longitud del arco y dientes supernumerarios. Anomalías tales como las reportadas en el presente caso, son importantes en la cirugía maxilofacial. Abstract in english Abnormal multiply unerupted permanent molars have long received the attention of anatomists and maxillofacial surgeons besides the other developmental teeth anomalies. This paper presents a clinical case of a 23-year-old male patient who was admitted to the department of maxillofacial surgery in faculty of dentistry in Gulhane Medical School with a six month history of pain at the rest position and during chewing and also tender on his right corpus of mandible. The impact (more) ion which resulted in eruption failure and anatomical dislocation of the normally developed three mandibular molar teeth was found. It was defined facial asymmetry on his right side in extra-oral examination. Diagnosis of multiple abnormal unerupted mandibular molar teeth was confirmed by panoramic and 3D CT images. The unerupted inverted tooth was the third molar which is positioned to basis of the mandible on the right side. In the other side, the first molar was placed on basis of mandible and located distoangulary. The second molar was located on middle of the left corpus mandible vertically. And also, the third molar was erupted mesioangulary. The arch-length was evaluated by the oral surgeon. Mesio-distal distance between the teeth was to be sufficient. Causes of impacted permanent teeth might have been influenced by local factors such as prolonged deciduous tooth retention, malposed tooth germs, but not causing arch-length deficiency and supernumerary teeth. Abnormalities such as those reported in the present case are significant during maxillofacial surgery.

Karacayli, Umit; Gocmen-Mas, Nuket

2009-03-01

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Endodontic treatment of molars  

Directory of Open Access Journals (Sweden)

Full Text Available Objective: Commissioned by the German Institute of Medical Documentation and Information (DIMDI) the Austrian Health Institute (ÖBIG) prepared a HTA report on the long-term effectiveness of endodontic treatment (root canal treatment, RCT) of molars. The focus is to examine factors influencing the outcome of endodontic treatment and showing their impact on long-term results. Additionally, economic aspects of root canal treatment in Germany are discussed. Methodology: By performing a systematic literature search in 29 databases (e.g. MEDLINE), the Cochrane Library and by hand searching two peer-reviewed endodontic journals the authors could identify 750 relevant articles, of which finally 18 qualified for assessment. Results: The findings show that the most relevant factor influencing the long-term outcome of endodontic treatment is the preoperative status of a tooth. The lowest success rates are reported for molars with a preoperative devital or necrotic pulp and persisting periapical lesions (so called periapical disease). Discussion: Even if there is no positive selection of patients and the RCT is performed by a normal dentist rather than an endodontist - a fact which is very common - long-term success rates of more then 90% are possible. The overall success rates for endodontic treatment of molars therefore seem to be similar to those of other tooth-types. Conclusions: Especially primary, conventional (i.e. non-surgical) root canal treatment is an effective and efficient therapy for endodontically ill molars, especially if no large periapical lesion persists. Nonetheless, a long term successful endodontic therapy requires a thorough assessment of the pre-operative status of the molar and treatment according to established guidelines.

Habl, Claudia; Bodenwinkler, Andrea; Stürzlinger, Heidi

2006-01-01

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Can coronectomy of wisdom teeth reduce the incidence of inferior dental nerve injury?  

Digital Repository Infrastructure Vision for European Research (DRIVER)

The aim of the study was to compare the surgical complications and neurosensory disturbance of coronectomy and conventional excision of lower third molars with roots in close proximity to inferior dental nerve. We conducted a randomized clinical trial of patients with lower third molars showing spec...

Leung, YY; Cheung, LK

44

Presentación de un paciente geriátrico con retención de tercer molar mandibular/ Presentation of a Geriatric Patient with Third Molar Retention  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Se presentó un paciente masculino de 80 años de edad con retención del tercer molar inferior, que acudió a cuerpo de guardia con cuadro inflamatorio subagudo y dolor de moderada intensidad. El examen radiográfico evidenció la presencia del tercer molar inferior retenido en posición horizontal, el cual presentaba en su corona área radiolúcida compatible con caries dental. El paciente fue tratado con antibiótico, analgésico y antiinflamatorio y una vez rebasada la fase aguda fue intervenido quirúrgicamente con excelente evolución Abstract in english A 80-year-old male patient with retention of third lower molar that was admitted at Emergency Service with inflammatory sub-acute status and pain of moderated intensity is presented. The radiographic exam evidenced the presence of the third molar retained at horizontal position, which presented in its crown, a dark area compatible with dental cavity. The patient was treated with antibiotic, analgesic and anti-inflammatory and when acute phase was over, the third molar was extracted. The surgery was completed without complications with an excellent evolution

Vazquez Isla, David; Rodríguez Garrido, Miguel Osvaldo; Reyna Leyva, Adis Mirta; Mesa Pupo, Mirleydi; Méndez Danta, Iveth

2013-06-01

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Evaluación del distalador molar Belussi/ Evaluation of Belussi's molar distalizer  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish La distalización de los molares superiores en mesogresión es una alternativa de tratamiento muy utilizado en nuestros días. Se conocen muchos métodos de distalización molar, estos han evolucionado notablemente y siguen siendo eficaces en el tratamiento. El objetivo de esta investigación fue evaluar los cambios dentales producidos por el distalador molar Belussi. El aparato fue empleado en 11 pacientes con una edad promedio de 12 años, distoclusión de molares causa (more) da por mesogresión, y con tipo facial favorable. A cada uno se le confeccionaron modelos de estudio y se le realizaron fotografías, radiografías panorámicas y telerradiografías laterales de cráneo, antes y después del tratamiento, para analizar las variables objeto de estudio. El aparato se mantuvo en boca hasta lograr un sobretratamiento de la relación molar. Finalmente, se obtuvo una distalización molar de 4,45 mm acompañada de una inclinación de 5,55°, con una pérdida mínima de anclaje temporal. Abstract in english The distalization of the superior molars in mesial migration is a useful alternative treatment nowadays. Many methods of molar distalization are known. They have significantly evolved and they are still effective in the treatment. The objective of this investigation was to evaluate the dental changes produced by Belussi Molar Distalizer. The appliance was used in 11 patients with an average of 12 years-old, distoocclusion of molars caused by mesial migration and with a fa (more) vorable facial type. Study models were made for each one of them and pictures, panoramic x-rays and lateral X-rays of the skull were taken, before and after the treatment, to analyze the variables object of study. The appliance was kept in the mouth until achieving an overtreatment of the molar relation. Finally, a molar distalization of 4.45 mm accompanied with an inclination of 5.55° was obtained, with a minimum loss of temporary anchorage.

Nour Khoury, Samer Abdel; Marín Manso, Gloria; Llanes Rodríguez, Maiyelín; Cruz Rivas, Yulenia

2008-12-01

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Conventional cross-sectional tomographic evaluation of mandibular third molars.  

UK PubMed Central (United Kingdom)

OBJECTIVE: The purpose of this study was to locate the mandibular canal in relation to the impacted mandibular third molar by conventional cross-sectional tomography. METHOD AND MATERIALS: Conventional axially corrected cross-sectional tomograms of 347 successive impacted mandibular third molars of 234 patients referred for removal of the impacted teeth were acquired with a Scanora x-ray unit. The images were assessed for location of the mandibular canal and the impacted mandibular third molar. Descriptive analysis was performed. RESULTS: Examination of the tomograms revealed the alveolar nerve to have, in relation to the mandibular third molar, a lateral (buccal) course in 53.6% (n = 186), a course between the roots in 26.8% (n = 93), a lingual course in 13.0% (n = 45), and an inferior course in 6.0% (n = 21). Supplementary canals were found in 6.3% (n = 22). Two of the tomograms (0.6%) could not be evaluated, in 1 case because of incorrect patient positioning, resulting in an incorrectly adjusted transverse cut, and in the other case because of a mandibular carcinoma. CONCLUSION: Conventional axially corrected cross-sectional tomograms offer additional information in cases where there is a close relationship between impacted third molars and the alveolar nerve (superimposition of the roots and the canal, grooving, or a varied direction of the canal on the panoramic radiograph) and may contribute to a higher level of intrasurgical safety.

Kaeppler G

2000-01-01

47

Embarazo molar repetido: Caso clínico  

Directory of Open Access Journals (Sweden)

Full Text Available Se presenta el caso clínico de una paciente con tres embarazos molares en tres años. Los dos primeros fueron dos molas completas y el último una mola parcial, todas de la misma pareja sexual. Se revisaron 385 historias de pacientes con cualquier tipo de embarazo molar entre 1991-2000. Hubo 3 pacientes con embarazo molar repetido lo que representa el 0,77 %, se diagnosticaron 104 embarazos y de estos 4 fueron molares lo que representó una mola por cada 26 embarazos. Se hacen comentarios sobre etiología, futuro reproductivo, posible evolución hacia tumor trofoblástico de la gestación y vigilancia clínica de los próximos embarazos.The case of a patient with three molar pregnancies in three years is reported. The first two were complete mola and the last one a partial mola, all from the same sexual partner. The record of 385 patients with any kind of molar pregnancy between 1991-2000 were revised and there were 3 patients with repeated molar pregnancies (0.77 %). There were 104 pregnancies from which 4 were mola (one mola for each 26 pregnancies). We comment about etiology, reproductive future, possible evolution to gestational trophoblastic tumor and clinical surveillance of subsequent pregnancies.

Leonor Zapata; Sol Felice Rebolledo; Rosa Urbano; José Vidal; Ivelise López

2002-01-01

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Consideraciones anatómicas del conducto alveolar inferior Anatomical considerations of the inferior alveolar canal  

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Full Text Available INTRODUCCIÓN: el conocimiento de variantes anatómicas del conducto alveolar inferior es necesario para la realización de procedimientos que involucren la mandíbula. El objetivo fue determinar las relaciones y variaciones anatómicas del conducto alveolar inferior MÉTODOS: se hizo un estudio descriptivo, en 50 hemimandíbulas humanas secas, midiendo distancias del foramen mandibular con respecto a los bordes anterior, posterior, inferior y escotadura sigmoidea, las distancias del agujero mentoniano al borde basal y la cresta alveolar. Se hicieron cortes en la rama y el cuerpo, para determinar las relaciones con estructuras anatómicas próximas. RESULTADOS: el foramen mandibular fue encontrado en el 88% en el tercio medio de rama. La distancia del foramen a la escotadura fue 19,78 ± 3,3 mm, al borde anterior 17,46 ± 3,04, al borde posterior 12,2 ± 1,9 y al borde basal 26,4 ± 3,8 mm. La ubicación del conducto alveolar inferior a nivel de rama respecto a los bordes anterior, posterior, lateral y medial fue 11,1 ± 2,6, 15,8 ± 2,7, 3,5 ± 1,0 y 1,9 ± 0,7 mm respectivamente. En el cuerpo mandibular la distancias respecto a los bordes basal, lateral, medial y alveolar fueron 10,1 ± 2,3, 4,7 ± 1,4, 2,5 ± 1,0 y 13,7 ± 2,7 mm respectivamente distal al tercer molar, 7,6 ± 1,7, 6,4 ± 1,4, 2,8 ± 1,0 y 16,4 ± 2,2 mm distal al segundo molar, 7,1 ± 1,5, 6,1 ± 1,3, 2,6 ± 0,8 y 17,0 ± 2,3 mm distal al primer molar, y 7,9 ± 1,7, 4,7 ± 1,2, 3,4 ± 1,2 y 18.3±2.7 mm distal al segundo premolar. El diámetro fue 2,82 ± 0,6 mm. La distancia del agujero mentoniano al borde basal fue 14,2 ± 1,59 mm, a la cresta alveolar 15,97 ± 2,87 mm, y se relacionó con el segundo premolar. CONCLUSIONES: los datos obtenidos, si bien, no infieren en la totalidad de la población colombiana, confirma que existen variaciones anatómicas del conducto alveolar inferior diferentes a las descritas en otras poblaciones.INTRODUCTION: the knowledge of anatomical variations of the inferior alveolar canal is necessary for surgical procedures involving the mandible. The purpose was to determine the relationships and anatomical variations of the mandibular canal. METHODS: a descriptive study was performed using 50 dry mandibles measuring distances of the mandibular foramen with respect to the anterior posterior and lower borders and the sigmoid notch, distances from the mental foramen to the basal border and the alveolar crest. Cuts were done in ramus and body to determine the relationship with close anatomical structures. RESULTS: The mandibular foramen was found in 88% of the cases in the middle third of ramus. The distance from the foramen to the sigmoid notch was 19.78 ± 3.3 mm, to the anterior border was 17.46 ± 3.04 mm, to the posterior border was 12.2 ± 1.9 mm and to the inferior border was 26.4 ± 3.8 mm. The location of the inferior alveolar canal on the mandibular ramus with respect to the anterior, posterior, lateral and medial borders were 11.1 ± 2.6 mm, 15.8 ± 2.7 mm, 3.5 ±1.0 mm y 1.9 ± 0.7 mm respectively. On the mandibular body, the distances from the inferior alveolar canal to the inferior, lateral, medial and alveolar borders were 10.1 ± 2.3 mm, 4.7 ± 1.4 mm, 2.5 ± 1.0 mm and 13.7±2.7 mm respectively distal to the third molar, 7.6 ± 1.7 mm, 6.4 ± 1.4 mm, 2.8 ± 1.0 mm and 16.4 ± 2.2 mm distal to the second molar, 7.1 ± 1.5 mm, 6.1 ± 1.3 mm, 2.6 ± 0.8 mm and 17.0 ± 2.3 mm distal to the first molar, and 7.9 ± 1.7 mm, 4.7 ± 1.2 mm, 3.4 ± 1.2 mm and 18.3 ± 2.7 mm distal to the second bicuspid. The diameter was 2.82 ± 0.6 mm. The distance from the mental foramen to the inferior border was 14.2 ± 1.59 mm, to the alveolar crest was 15.97 ± 2.87 mm, and it was directly re

Omar Yamid Ruge Jiménez; Oscar Andrés Camargo Cañón; Yudy Patricia Ortiz

2009-01-01

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Mandibular Third Molar Impaction: Review of Literature and a Proposal of a Classification  

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Full Text Available Objectives: The purpose of present article was to review impacted mandibular third molar aetiology, clinical anatomy, radiologic examination, surgical treatment and possible complications, as well as to create new mandibular third molar impaction and extraction difficulty degree classification based on anatomical and radiologic findings and literature review results.Material and Methods: Literature was selected through a search of PubMed, Embase and Cochrane electronic databases. The keywords used for search were mandibular third molar, impacted mandibular third molar, inferior alveolar nerve injury third molar, lingual nerve injury third molar. The search was restricted to English language articles, published from 1976 to April 2013. Additionally, a manual search in the major anatomy and oral surgery journals and books was performed. The publications there selected by including clinical and human anatomy studies.Results: In total 73 literature sources were obtained and reviewed. Impacted mandibular third molar aetiology, clinical anatomy, radiographic examination, surgical extraction of and possible complications, classifications and risk factors were discussed. New mandibular third molar impaction and extraction difficulty degree classification based on anatomical and radiologic findings and literature review results was proposed. Conclusions: The classification proposed here based on anatomical and radiological impacted mandibular third molar features is promising to be a helpful tool for impacted tooth assessment as well as for planning for surgical operation. Further clinical studies should be conducted for new classification validation and reliability evaluation.

Gintaras Juodzbalys; Povilas Daugela

2013-01-01

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Relation between mandibular third molar and mandibular canal assessed by computed tomography  

International Nuclear Information System (INIS)

During the removal of the mandibular third molar, the inferior alveolar nerve in the canal sometimes damaged. To avoid this complication, it is necessary to understand the positional relationship between the mandibular third molar and the mandibular canal. We evaluated the relationship between the mandibular 3rd molar and the mandibular canal with panoramic X-p and computed tomography (CT). Eighty-six (50.0%) mandibular canals were buccal type, 64 were inferior type, 18 were lingal type, and 4 were between the roots type on CT findings. 137 (79.7%) canal pattern were round type, 35 were flatness type. 109 (63.4%) presence of bone were interposition type, 63 were non-interposition type. Among 172 third molar extraction, hypesthesia of lower lip was observed in 3 cases and inferior alveolar nerve was exposed in 3 teeth. There was no overlap between hypesthesia and nerve exposure. CT provides useful information to surgeons regarding the relationship between the mandibular third molar and the mandibular canal. (author)

2008-01-01

51

Primary inferior oblique overaction-management by inferior oblique recession.  

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Full Text Available PURPOSE: To evaluate the effect of 10 mm inferior oblique recession in horizontal strabismus with V pattern and primary inferior oblique overaction. METHODS: Ten patients of V esotropia and exotropia with primary inferior oblique overaction underwent 10 mm inferior oblique recession by the methods described by Park and Stallard. Pre- and postoperative V pattern, inferior oblique overaction and binocularity were assessed. Patients were followed up for 3 months. RESULTS: The mean preoperative V pattern was 38.3 PD and the mean inferior oblique overaction was 22 PD. After surgery the mean correction of the V pattern was 26.9 PD and the mean residual V pattern was 11.4 PD. None of the patients had inferior oblique overaction postoperatively. 70% of the patients showed improvement in binocularity. CONCLUSION: 10 mm Inferior oblique recession by the described technique is a simple, safe and effective method for the cosmetic and functional treatment of horizontal deviation and V pattern with primary inferior oblique overaction.

Kamlesh; Dadeya Subhash; Kohli Vandana; Fatima Shibal

2002-01-01

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Mini-implants: mechanical resource for molars uprighting  

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Full Text Available INTRODUCTION: The early orthodontic treatment allows correction of skeletal discrepancies by growth control, and the elimination of deleterious habits, which are risk factors for the development of malocclusions, favoring for the correction of tooth positioning later in a second treatment stage. During development of teeth and occlusion, the mandibular second molars commonly erupt in the oral cavity after all other teeth of the anterior region. In their eruptive process there may be a condition known as tooth impaction, which precludes its complete eruption and requires proper uprighting treatment. The temporary anchorage devices allow disimpaction and movement of these teeth directly to their final position, without the need of patient compliance or reaction movements in other parts of the arch. OBJECTIVE: This paper aims at describing a case report of the treatment of a patient with Angle Class II malocclusion, performed in two phases, in which mini-implants were used for uprighting the impacted mandibular second molars.INTRODUÇÃO: o tratamento ortodôntico precoce permite a correção das discrepâncias esqueléticas por meio do controle de crescimento e a eliminação de hábitos deletérios, que são fatores de risco para o desenvolvimento de más oclusões, que favorecem a correção do posicionamento dentário mais tardiamente, em uma segunda fase do tratamento. Durante o desenvolvimento da dentição e da oclusão, normalmente o segundo molar inferior chega à cavidade bucal após todos os dentes posicionados anteriormente a ele. Durante seu processo eruptivo, pode ocorrer uma condição chamada "impacção dentária", em que sua erupção completa é interrompida, exigindo tratamento apropriado para verticalização. Os dispositivos temporários de ancoragem permitem a desimpacção e a movimentação desses dentes diretamente às suas posições finais, sem a necessidade de cooperação do paciente e sem movimento de reação nas outras unidades da arcada. OBJETIVO: descrever o tratamento de um caso de má oclusão Classe II de Angle, realizado em duas fases, durante o qual foram utilizados mini-implantes para verticalização dos segundos molares inferiores impactados.

Susiane Allgayer; Deborah Platcheck; Ivana Ardenghi Vargas; Raphael Carlos Drumond Loro

2013-01-01

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Primer registro de Clastoptera sp. (Hemiptera: Cercopidae) en Harpalyce arborescens (Fabaceae) del bosque tropical deciduo de Tamaulipas, México First record of Clastoptera sp. (Hemiptera: Cercopidae) in Harpalyce arborescens (Fabaceae) of the tropical deciduous forest in Tamaulipas, Mexico  

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Full Text Available Se registra por primera vez la presencia de Clastoptera sp., asociada a Harpalyce arborescens, especie de árbol maderable de alto valor comercial del bosque tropical deciduo del estado de Tamaulipas. Los registros se delimitan a 2 localidades, ubicadas en 3 sitios: San Vicente y González, del municipio de Casas, en la zona sureste de la Sierra de Tamaulipas (23°25'35.76" N, 98°38'56.86" O; 382 m y 23°21'35.75" N, 98°38'21.06" O; 455 m) y en el ejido Morelos, municipio de Llera, en la parte media de la misma sierra (23°27'27.37" N, 99°05'09.41" O; 546 m).Castopetra sp. is reported for the first time associated to Harpalyce arborescens at a timber tree species of high commercial value of the tropical deciduous forest in Tamaulipas state. The records of the genus are restricted to 2 locations in 3 sites: San Vicente and González, municipality of Casas in the southeast of the Sierra de Tamaulipas (23°25'35.76" N, 98°38'56.86" W; 382 m and 23°21'35.75" N, 98°38'21.06" W; 455 m), and the ejido Morelos municipality of Llera in the middle of the same range (23°27'27.37" N, 99°05'09.41" W; 546 m).

José Guadalupe Martínez-Avalos; Manuel Lara; Griselda Gaona; Gerardo Sánchez-Ramos

2012-01-01

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Primer registro de Clastoptera sp. (Hemiptera: Cercopidae) en Harpalyce arborescens (Fabaceae) del bosque tropical deciduo de Tamaulipas, México/ First record of Clastoptera sp. (Hemiptera: Cercopidae) in Harpalyce arborescens (Fabaceae) of the tropical deciduous forest in Tamaulipas, Mexico  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Se registra por primera vez la presencia de Clastoptera sp., asociada a Harpalyce arborescens, especie de árbol maderable de alto valor comercial del bosque tropical deciduo del estado de Tamaulipas. Los registros se delimitan a 2 localidades, ubicadas en 3 sitios: San Vicente y González, del municipio de Casas, en la zona sureste de la Sierra de Tamaulipas (23°25'35.76" N, 98°38'56.86" O; 382 m y 23°21'35.75" N, 98°38'21.06" O; 455 m) y en el ejido Morelos, municipio de Llera, en la parte media de la misma sierra (23°27'27.37" N, 99°05'09.41" O; 546 m). Abstract in english Castopetra sp. is reported for the first time associated to Harpalyce arborescens at a timber tree species of high commercial value of the tropical deciduous forest in Tamaulipas state. The records of the genus are restricted to 2 locations in 3 sites: San Vicente and González, municipality of Casas in the southeast of the Sierra de Tamaulipas (23°25'35.76" N, 98°38'56.86" W; 382 m and 23°21'35.75" N, 98°38'21.06" W; 455 m), and the ejido Morelos municipality of Llera in the middle of the same range (23°27'27.37" N, 99°05'09.41" W; 546 m).

Martínez-Avalos, José Guadalupe; Lara, Manuel; Gaona, Griselda; Sánchez-Ramos, Gerardo

2012-12-01

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Autotransplantation of a Mandibular Third Molar: A Case Report with 5 Years of Follow-up  

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Full Text Available Abstract in portuguese O objetivo deste trabalho foi descrever o transplante autógeno de um terceiro molar inferior direito para substituir as raízes residuais do segundo molar no mesmo quadrante, preservando a função e a estética. Foi realizado acompanhamento clínico e radiográfico por 5 anos. Após o transplante, o dente doador recebeu tratamento endodôntico e colocação de hidróxido de cálcio, o qual foi substituído periodic (more) amente a cada 3 meses, até a obturação dos canais radiculares, totalizando período de 1 ano quando então, o fechamento apical foi confirmado. O dente encontra-se em perfeitas condições funcionais e estéticas após 5 anos do início do tratamento. O autotransplante é uma opção viável para a substituição de dentes perdidos quando um dente doador está disponível. O autotransplante de um terceiro molar inferior direito com comprometimento estético e funcional afim de substituir raízes residuais (resultado de um processo cariogênio extenso) de um segundo molar do mesmo quadrante foi um tratamento alternativo viável. Abstract in english This paper describes the autologous transplantation of a mandibular right third molar to replace the residual roots of the second molar in the same quadrant, preserving function and aesthetics. A 5-year clinical and radiographic follow-up was undertaken. After transplantation, the donor tooth received endodontic treatment and placement of calcium hydroxide, which was periodically replaced every 3 months until the filling of the root canals, totalizing a period of 1-year, (more) when apical closure was confirmed. The tooth was in perfect functional and aesthetic conditions 5 years after beginning of treatment. Autotransplantation is a feasible option for replacing missing teeth when a donor tooth is available. The autotransplantation of a right mandibular third molar with compromised function and aesthetics to replace the residual roots resulting from coronal destruction due to extensive carious lesion of the second molar in the same quadrant was a viable treatment alternative.

Silva, Mauro Henrique Chagas e; Lacerda, Mariane Floriano Lopes Santos; Chaves, Maria das Gracas Afonso Miranda; Campos, Celso Neiva

2013-06-01

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Fracture behavior of human molars.  

UK PubMed Central (United Kingdom)

Despite the durability of human teeth, which are able to withstand repeated loading while maintaining form and function, they are still susceptible to fracture. We focus here on longitudinal fracture in molar teeth-channel-like cracks that run along the enamel sidewall of the tooth between the gum line (cemento-enamel junction-CEJ) and the occlusal surface. Such fractures can often be painful and necessitate costly restorative work. The following study describes fracture experiments made on molar teeth of humans in which the molars are placed under axial compressive load using a hard indenting plate in order to induce longitudinal cracks in the enamel. Observed damage modes include fractures originating in the occlusal region ('radial-median cracks') and fractures emanating from the margin of the enamel in the region of the CEJ ('margin cracks'), as well as 'spalling' of enamel (the linking of longitudinal cracks). The loading conditions that govern fracture behavior in enamel are reported and observations made of the evolution of fracture as the load is increased. Relatively low loads were required to induce observable crack initiation-approximately 100 N for radial-median cracks and 200 N for margin cracks-both of which are less than the reported maximum biting force on a single molar tooth of several hundred Newtons. Unstable crack growth was observed to take place soon after and occurred at loads lower than those calculated by the current fracture models. Multiple cracks were observed on a single cusp, their interactions influencing crack growth behavior. The majority of the teeth tested in this study were noted to exhibit margin cracks prior to compression testing, which were apparently formed during the functional lifetime of the tooth. Such teeth were still able to withstand additional loading prior to catastrophic fracture, highlighting the remarkable damage containment capabilities of the natural tooth structure.

Keown AJ; Lee JJ; Bush MB

2012-12-01

57

Fracture behavior of human molars.  

Science.gov (United States)

Despite the durability of human teeth, which are able to withstand repeated loading while maintaining form and function, they are still susceptible to fracture. We focus here on longitudinal fracture in molar teeth-channel-like cracks that run along the enamel sidewall of the tooth between the gum line (cemento-enamel junction-CEJ) and the occlusal surface. Such fractures can often be painful and necessitate costly restorative work. The following study describes fracture experiments made on molar teeth of humans in which the molars are placed under axial compressive load using a hard indenting plate in order to induce longitudinal cracks in the enamel. Observed damage modes include fractures originating in the occlusal region ('radial-median cracks') and fractures emanating from the margin of the enamel in the region of the CEJ ('margin cracks'), as well as 'spalling' of enamel (the linking of longitudinal cracks). The loading conditions that govern fracture behavior in enamel are reported and observations made of the evolution of fracture as the load is increased. Relatively low loads were required to induce observable crack initiation-approximately 100 N for radial-median cracks and 200 N for margin cracks-both of which are less than the reported maximum biting force on a single molar tooth of several hundred Newtons. Unstable crack growth was observed to take place soon after and occurred at loads lower than those calculated by the current fracture models. Multiple cracks were observed on a single cusp, their interactions influencing crack growth behavior. The majority of the teeth tested in this study were noted to exhibit margin cracks prior to compression testing, which were apparently formed during the functional lifetime of the tooth. Such teeth were still able to withstand additional loading prior to catastrophic fracture, highlighting the remarkable damage containment capabilities of the natural tooth structure. PMID:22956116

Keown, Amanda J; Lee, James J-W; Bush, Mark B

2012-09-06

58

Mandibular lip bumper for molar torque control.  

Science.gov (United States)

Treatment effects of lip bumpers alone include flaring of the mandibular incisors, distalization and uprighting of the mandibular first molars, and buccal expansion of the canines, premolars, and molar. Lip forces are transmitted through this appliance onto the molars. Moreover the lip bumper is able to derotate, expand or constrict, upright and reinforce the anchorage whereas torque control is lacking. Aim of this paper is the presentation of a new type of lip bumper that allows the molar torque control. PMID:21515237

Celentano, Giuseppe; Longobardi, Annalisa; Cannavale, Rosangela; Perillo, Letizia

2011-03-29

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Mandibular lip bumper for molar torque control.  

UK PubMed Central (United Kingdom)

Treatment effects of lip bumpers alone include flaring of the mandibular incisors, distalization and uprighting of the mandibular first molars, and buccal expansion of the canines, premolars, and molar. Lip forces are transmitted through this appliance onto the molars. Moreover the lip bumper is able to derotate, expand or constrict, upright and reinforce the anchorage whereas torque control is lacking. Aim of this paper is the presentation of a new type of lip bumper that allows the molar torque control.

Celentano G; Longobardi A; Cannavale R; Perillo L

2011-01-01

60

Prevalência de perda precoce de molares decíduos: estudo retrospectivo = Prevalence of early loss of deciduous molars: a retrospective study  

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Full Text Available Este estudo retrospectivo determinou a prevalência da perda precoce demolares decíduos em pacientes atendidos na clínica de Odontopediatria da Universidade Estadual da Paraíba. Foram examinados 515 prontuários, sendo os dados registrados em um formulário. Foram analisadas as variáveis: gênero, idade, tipo de molar decíduo perdido,arcada dentária (maxilar ou mandibular) e lado (direito e esquerdo). Observou-se que a prevalência de perda precoce foi de 15,1%, existindo uma distribuição similar entre os gêneros. Em relação à idade da criança, a maior freqüência de perda acometeu pacientescom sete anos (32,1%). Houve distribuição equitativa da perda dentária entre as arcadas superior e inferior, com 43,6% cada uma, sendo o lado esquerdo o mais acometido (41%). O segundo molar superior esquerdo foi o mais acometido (17,9%), seguido do primeiromolar decíduo superior direito (16,1%). Pode-se concluir que a prevalência de perda precoce foi baixa e que os molares decíduos superiores foram os dentes mais comumente perdidos.This retrospective study determined the prevalence of early loss of deciduous molars in patients enrolled at the Pediatric Dentistry clinic at the State University of Paraíba. A review of 515 patient records were analyzed, registered in a form. The following variables were analyzed: gender, age, type of deciduous molar loss, region (maxilla or mandible) and side (right and left). It was observed that the prevalence of early tooth loss was 15.1% and there was a similar distribution between the genders. In regard to age, the greatest frequency of tooth loss involved patients at 7 years old (32.1%). There was a similar distribution of tooth loss between the maxilla and mandible regions, at 43.6% each, with the left side being themost involved (41%). The second upper left deciduous molar was the most commonly missing tooth (17.9%), followed by the first upper right deciduous molar (16.1%). It can be concluded that the prevalence of early loss was lower and that the upper primary molarswere the most commonly missing teeth.

Alessandro Leite Cavalcanti; Suyanne Amorim Menezes; Ana Flávia Granville-Garcia; Luciana Barros Correia Fontes

2008-01-01

 
 
 
 
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Inferior alveolar nerve lateral transposition.  

UK PubMed Central (United Kingdom)

PURPOSE: We determined the outcomes of 18 inferior alveolar nerve lateral transposition procedures in 15 consecutive patients. The advantages and disadvantages of this technique are discussed. RESULTS: The surgical protocol for inferior alveolar nerve transposition, followed by implant placement, presented excellent results, with complete recovery of the sensitivity within 6 months after the surgical procedure. DISCUSSION: Inferior alveolar nerve transposition is an option for prosthetic rehabilitation in cases of moderate or even severe bone reabsorption for patients that do not tolerate removable dentures. CONCLUSIONS: It is concluded that inferior alveolar nerve transposition can be safely and predictably performed with low risk to the mental nerve sensibility. Each patient should be advised of the chance of permanent nerve deficit throughout the distribution of the mental nerve. Alternative restorative solutions should also be considered.

Chrcanovic BR; Custódio AL

2009-12-01

62

Anaesthetic Challenges in Molar Pregnancy  

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Full Text Available Gestational Trophoblastic Disease (GTD) is a spectrum of tumours with a wide range of biologic behaviour and potential for metastases, which were often fatal in the past. However, with better understanding of patho-physiology in the last few years, most women can now be cured. A Hydatidiform Mole (or Molar Pregnancy) is a benign Gestational Trophoblastic Disease that originates from the placenta. Treatment consists of vacuum evacuation but rarely hysterectomy may be required. Anaesthetic management is often complicated by the associated derangements.

Ghansham Biyani; Sadik Mohammed; Pradeep Bhatia

2013-01-01

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Evaluation of Dental Eruption of Third Molars in the Length of Mandible Evaluación de la Erupción Dentaria de los Terceros Molares en Relación a la Longitud de la Mandíbula  

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Full Text Available The aim of this work was to evaluate the eruption of the third molar teeth in the length of the mandible using the orthodontic documentation obtained between 2005 and 2006 as sampling method, a total of 193 cases of both sexes. The cephalometric analysis and panoramic radiographic studies were chosen from two clinics randomly selected in the city of Recife ­ Pernambuco - Brazil. It was analyzed the linear size of mandibular bone by the use of McNamara's Cephalometric Analysis, and also the presence or not of dental retention of inferior third molar teeth with the help of panoramic radiographic study, evaluating the commitment of these retentions with the effective length of mandible. The work concluded that when the effective mandibular length is small induces a dental retention of these third molars, mostly the left inferior third molar, which 46.5% of the cases was observed as retained. However, in 53.8% of the cases was observed the absence or no-formation of these dental germs for the left inferior third molar and 60% for the right, showing a big size of the effective length of the mandible exposing that the no-formation of these teeth was not directly related to the lack of space in the dental arch. The study demonstrated that the sexual dimorphism does not influence the eruption of these teeth, however, according to age, was emphasized a dependence concerning about dental eruption, retention or absence of left inferior third molar.El objetivo de la presente investigación fue evaluar la erupción del tercer molar a lo largo de la mandíbula usando documentación de ortodoncia obtenida entre los años 2005 y 2006, en un total de 193 casos de individuos brasileños, adultos, de ambos sexos. El análisis cefalométrico y los estudios radiográficos panorámicos fueron obtenidos de dos clínicas y seleccionados al azar en la ciudad de Recife, Estado de Pernambuco, Brasil. Se analizó el tamaño linear de la mandíbula usando el método cefalómetrico de McNamara, y también la presencia o ausencia de retención dental del tercer molar inferior con la ayuda de radiografías panorámicas, evaluando la relación de esas retenciones, si las hubiere, con la longitud efectiva de la mandíbula. Los resultados muestran que cuando la longitud mandibular efectiva es pequeña induce a retención dental de los terceros molares, siendo en la mayoría de los casos el tercer molar inferior izquierdo, lo cual fue obervado en 46,5 % . Sin embargo, en el 53,8 % de los casos se observó ausencia o no formación de los gérmenes dentales del molar mencionado, característica que se encontró en 60 % en el lado derecho, mostrando un gran tamaño de longitud efectiva de la mandíbula, indicando que la no formación de ese molar no fue directamente relacionada a un reducido espacio en el arco dental. El estudio demostró que el dimorfismo sexual no influencia la erupción de ese molar, sin embargo, la variable edad, resaltó una dependencia relacionada con la erupción dental, retención o ausencia del tercer molar inferior izquierdo.

Gilberto de Sousa Filho; Adelmar Afonso de Amorim Júnior; Carla Cabral dos Santos Accioly Lins; Joaquim Celestino da Silva Neto

2009-01-01

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La hiperdontia en región de molares/ Hyperdontia in molar region  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish La hiperdontia constituye una de las anomalías más estudiadas de la dentición humana. Esa alteración representa la aparición de uno o más dientes en cantidades mayores de lo normal, que puede ocurrir en la mandíbula o maxila y de manera unilateral o bilateral. La etiología de los dientes supernumerarios puede ser explicada principalmente por hiperactividad de la lámina dentaria en la fase inicial. Es importante la detección precoz de dientes supernumerarios porq (more) ue se ha visto una serie de complicaciones como los diastemas, que pueden causar en la cavidad bucal: retardo de la erupción o dientes impactados, posicionamiento inadecuado de dientes permanentes, desajuste oclusal y el desarrollo de quistes y tumores odontógenos. Así el diagnóstico es normalmente realizado a partir de un examen radiográfico convencional, principalmente la radiografía panorámica. Este trabajo tuvo como objetivo relatar 4 casos clínicos de pacientes con presencia de molares supernumerarios, que fueron atendidos en el Servicio de Radiología de la Escuela de Odontología de la Universidad Federal de Ceará. Abstract in english Hyperdontia is one of the more studied anomalies of human dentition. This alteration represents the appearance of one or more teeth in a number greater of normal, occurring in mandible or in maxilla and could be unilateral or bilateral. The etiology of supernumerary teeth may be explained mainly due to the hyperactivity of dental plate in its initial phase; its early detection is important because of there have been a series of complications that may to cause diastemata, (more) eruption retard or impacted teeth, inappropriate positioning of permanent teeth, occlusal misalignment and the development of odontogenic cysts or tumors. Thus, the diagnosis is normally made from a conventional radiographic examination, mainly the panoramic X-ray. The objective of present paper is the present four clinical cases of patients presenting with supernumerary molars, seen in the Radiology Service during the course of stomatology of the Federal University of Ceará.

de Miranda Candeiro, George Táccio; Velásquez Lopez, Julio Ricardo; Robles Ruiz, Julissa Janet

2011-12-01

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La hiperdontia en región de molares Hyperdontia in molar region  

Directory of Open Access Journals (Sweden)

Full Text Available La hiperdontia constituye una de las anomalías más estudiadas de la dentición humana. Esa alteración representa la aparición de uno o más dientes en cantidades mayores de lo normal, que puede ocurrir en la mandíbula o maxila y de manera unilateral o bilateral. La etiología de los dientes supernumerarios puede ser explicada principalmente por hiperactividad de la lámina dentaria en la fase inicial. Es importante la detección precoz de dientes supernumerarios porque se ha visto una serie de complicaciones como los diastemas, que pueden causar en la cavidad bucal: retardo de la erupción o dientes impactados, posicionamiento inadecuado de dientes permanentes, desajuste oclusal y el desarrollo de quistes y tumores odontógenos. Así el diagnóstico es normalmente realizado a partir de un examen radiográfico convencional, principalmente la radiografía panorámica. Este trabajo tuvo como objetivo relatar 4 casos clínicos de pacientes con presencia de molares supernumerarios, que fueron atendidos en el Servicio de Radiología de la Escuela de Odontología de la Universidad Federal de Ceará.Hyperdontia is one of the more studied anomalies of human dentition. This alteration represents the appearance of one or more teeth in a number greater of normal, occurring in mandible or in maxilla and could be unilateral or bilateral. The etiology of supernumerary teeth may be explained mainly due to the hyperactivity of dental plate in its initial phase; its early detection is important because of there have been a series of complications that may to cause diastemata, eruption retard or impacted teeth, inappropriate positioning of permanent teeth, occlusal misalignment and the development of odontogenic cysts or tumors. Thus, the diagnosis is normally made from a conventional radiographic examination, mainly the panoramic X-ray. The objective of present paper is the present four clinical cases of patients presenting with supernumerary molars, seen in the Radiology Service during the course of stomatology of the Federal University of Ceará.

George Táccio de Miranda Candeiro; Julio Ricardo Velásquez Lopez; Julissa Janet Robles Ruiz

2011-01-01

66

Mini-implants: mechanical resource for molars uprighting  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese INTRODUÇÃO: o tratamento ortodôntico precoce permite a correção das discrepâncias esqueléticas por meio do controle de crescimento e a eliminação de hábitos deletérios, que são fatores de risco para o desenvolvimento de más oclusões, que favorecem a correção do posicionamento dentário mais tardiamente, em uma segunda fase do tratamento. Durante o desenvolvimento da dentição e da oclusão, normalmente o segundo molar inferior chega à cavidade bucal apó (more) s todos os dentes posicionados anteriormente a ele. Durante seu processo eruptivo, pode ocorrer uma condição chamada "impacção dentária", em que sua erupção completa é interrompida, exigindo tratamento apropriado para verticalização. Os dispositivos temporários de ancoragem permitem a desimpacção e a movimentação desses dentes diretamente às suas posições finais, sem a necessidade de cooperação do paciente e sem movimento de reação nas outras unidades da arcada. OBJETIVO: descrever o tratamento de um caso de má oclusão Classe II de Angle, realizado em duas fases, durante o qual foram utilizados mini-implantes para verticalização dos segundos molares inferiores impactados. Abstract in english INTRODUCTION: The early orthodontic treatment allows correction of skeletal discrepancies by growth control, and the elimination of deleterious habits, which are risk factors for the development of malocclusions, favoring for the correction of tooth positioning later in a second treatment stage. During development of teeth and occlusion, the mandibular second molars commonly erupt in the oral cavity after all other teeth of the anterior region. In their eruptive process t (more) here may be a condition known as tooth impaction, which precludes its complete eruption and requires proper uprighting treatment. The temporary anchorage devices allow disimpaction and movement of these teeth directly to their final position, without the need of patient compliance or reaction movements in other parts of the arch. OBJECTIVE: This paper aims at describing a case report of the treatment of a patient with Angle Class II malocclusion, performed in two phases, in which mini-implants were used for uprighting the impacted mandibular second molars.

Allgayer, Susiane; Platcheck, Deborah; Vargas, Ivana Ardenghi; Loro, Raphael Carlos Drumond

2013-02-01

67

[Molar pregnancy (primary or recurrent?)].  

Science.gov (United States)

A peculiar case of gestational trophoblastic disease is described. A 24 year old female with former history of three molar pregnancies, spontaneous abortion and anembryoic pregnancy was admitted because of a newly diagnosed hydatiform mole (ex novo). After uterine curettage followed by a low oral dose of methotrexate (0.5 mg/kg/day) for five days. The HCG levels determined in plasma by beta-HCG- radioinmmunoassay, became negative until four months of follow3 up. An intrauterine device was installed. She resumed HCG positivity a year later and a histerectomy was performed. A post-surgical diagnosis of invasive mole was made. Since the possibility of intercurrent pregnancy was lowered by the presence of a intrauterine device, we assumed that trophoblastic transformation into an invasive mole adopted a sort of dormant period before its resurge (resurrection) independently either from curettage of chemotherapy. PMID:2562106

Ayala, A; Aizpuru, E; Tovar, J M

1989-08-01

68

[Molar pregnancy (primary or recurrent?)  

UK PubMed Central (United Kingdom)

A peculiar case of gestational trophoblastic disease is described. A 24 year old female with former history of three molar pregnancies, spontaneous abortion and anembryoic pregnancy was admitted because of a newly diagnosed hydatiform mole (ex novo). After uterine curettage followed by a low oral dose of methotrexate (0.5 mg/kg/day) for five days. The HCG levels determined in plasma by beta-HCG- radioinmmunoassay, became negative until four months of follow3 up. An intrauterine device was installed. She resumed HCG positivity a year later and a histerectomy was performed. A post-surgical diagnosis of invasive mole was made. Since the possibility of intercurrent pregnancy was lowered by the presence of a intrauterine device, we assumed that trophoblastic transformation into an invasive mole adopted a sort of dormant period before its resurge (resurrection) independently either from curettage of chemotherapy.

Ayala A; Aizpuru E; Tovar JM

1989-08-01

69

Má oclusão Classe I de Angle tratada com extrações de primeiros molares permanentes Angle Class I malocclusion treated with extraction of first permanent molars  

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Full Text Available A má oclusão Classe I de Angle é caracterizada por uma relação anteroposterior normal nos molares, que pode ou não estar acompanhada por alterações esqueléticas - nos planos vertical ou transverso - ou dentárias. A biprotrusão, revelada pela inclinação acentuada dos incisivos superiores e inferiores para vestibular, somada ao trespasse horizontal excessivo, faz com que o paciente fique mais exposto a traumas dentários, além de causar comprometimento estético. A escolha dos dentes a serem extraídos para a correção, geralmente, recai sobre os primeiros ou segundos pré-molares, devido à sua posição na arcada. Contudo, a extração do primeiro molar permanente, em função de algum comprometimento, por cárie ou restauração extensa, pode ser uma alternativa, proporcionando a manutenção de um dente hígido em detrimento de outro já manipulado. O presente caso, tratado de maneira incomum, pela extração dos quatro primeiros molares permanentes, foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO), representando a categoria 2, como parte dos requisitos para a obtenção do título de diplomado pelo BBO.Angle Class I malocclusion is characterized by normal anteroposterior molar relationship, which may or may not be accompanied by skeletal changes-in the vertical or transverse planes-or dental changes. Bimaxillary dental protrusion, characterized by pronounced labial inclination of maxillary and mandibular incisors combined with excessive overjet, expose patients to dental trauma and compromise aesthetics. In deciding which teeth to extract for Class I correction the first or second premolars are usually selected due to their location in the dental arch. However, the extraction of a first permanent molar compromised by caries or extensive restoration may be an alternative that ensures the preservation of a healthy tooth instead of one that has already been manipulated. This case, treated in an unusual manner by the extraction of four first permanent molars, was presented to the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO) as representative of category 2, as part of the requirements for obtaining the BBO diplomate title.

Ivan Tadeu Pinheiro da Silva

2010-01-01

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Intraosseous schwannoma originating in inferior alveolar nerve: a case report.  

UK PubMed Central (United Kingdom)

Schwannomas (neurilemmomas) are benign neoplasms derived from Schwann cells of the neurilemma and appear most frequently on the auditory nerve or peripheral nerves of the skin. They arise in the oral and maxillofacial region infrequently, and very rarely in the center of the jaw. We herein present a case of a rare mandibular intraosseous schwannoma derived from the main trunk of the inferior alveolar nerve in a 33-year-old man. Fusiform expansion in the mandibular canal was observed and a mass showing the target sign in the mandibular canal was confirmed on T2-weighted and Gd contrastenhanced T1-weighted MRI. Based on these findings, an inferior alveolar nerve-derived schwannoma or other benign nervous system neoplasm was diagnosed. A buccal side cortical bone flap in the mandibular molar region was removed to expose the mass, which was then peeled away from the nerve fibers and completely removed. Some inferior alveolar nerve fibers that were connected to the mass were removed at the same time, but the remaining nerve fiber bundle was preserved. Histopathology confirmed the diagnosis of a schwannoma with Antoni type A and Antoni type B regions. Although the patient experienced extremely mild paresthesia in the skin over the mental region and mental foramen at immediately after surgery, this had almost entirely disappeared at 7 years and 4 months later, and there has been no tumor recurrence.

Suga K; Ogane S; Muramatsu K; Ohata H; Uchiyama T; Takano N; Shibahara T; Eguchi J; Murakami S; Matsuzaka K

2013-01-01

71

Positional relationship between the deciduous molar and the successional permanent teeth. Three-dimensional observation of the deciduous second molars and second premolars by X-ray CT  

International Nuclear Information System (INIS)

To investigate the positional relationship between the maxillo-mandibular deciduous second molars and the successional permanent teeth, the second premolars in the jaw bones, three-dimensional observation of dry skulls was performed using X-ray CT. The specimens were 30 dry skulls, comprising of 15 dry skulls in the deciduous dentition period and 15 dry skulls in the first half of the mixed dentition period. The following results were obtained: Regarding the observation of the horizontally sectioned images, measurement was performed by overlapping horizontally sectioned images of the outline form of the tooth crown of the deciduous second molars, and those of the bony crypt of the second premolars. In the maxillary bone, the bony crypt of the second premolars was mesio-distally within the outline form of the tooth crown of the diciduous second molars, whereas it was bucco-lingually on the palatal side. In the mandibular bone, although the bony crypt of the second premolars was bucco-lingually within the outline form of the tooth crown of the deciduous second molars, it was mesio-distally slightly on the distal side. By observing the position of the central point of the deciduous second molar tooth crown and that of the deciduous second molar tooth root, differences were noted in both the maxilla and mandible, and the distance between the 2 points was larger in the mandible. Furthermore, by observing the position of the central point of the deciduous second molar tooth crown and that of the bony crypt of the second premolars, the distance was larger in the maxilla. Regarding the observation of the vertically sectioned images, bucco-lingual sections of the maxillo-mandibular deciduous second molars were observed. Differences in the inclination angle between the coronal axis of the deciduous second molars and the axis of the bony crypt were smaller in the maxilla than in the mandible. Therefore, it was speculated that the bony crypt was vertically located near the direction of the coronal axis of the deciduous second molars in the maxilla, and was in the inferior position of the crown of the deciduous second molars in the mandible. The vertical distance between the occlusal surface (cuspal mid-point) of the deciduous second molars and the superior edge point of the bony crypt of the second molars was 9.3 mm in the maxilla, and 9.8 mm in the mandible, and that between the occlusal surface of the deciduous second molars and the central point of the bony crypt was 14.4 mm in the maxilla, and 14.0 mm in the mandible, showing no significant differences between the maxilla and mandible. Concerning the positional relationship between the maxillo-mandibular deciduous second molars and the second premolars, these findings revealed that the bony crypts of the successional permanent teeth are not positioned in the central area of the deciduous tooth crowns, both bucco-lingually and mesio-distally, but in characteristic positions in both the maxilla and mandible. It was also found that differences in the mutual positional relationship were large in the maxilla, in particular. (author)

2005-01-01

72

Molar ectopic pregnancy in the uterine cornus.  

Science.gov (United States)

Cornual pregnancy is a rare form of ectopic pregnancy. The incidence of hydatiform molar pregnancy is 1 in 1000 to 2000 pregnancies. Molar cornual ectopic pregnancy is extremely rare. A 41-year-old nulliparous woman was admitted via the emergency department because of vaginal bleeding for 2 weeks. Transvaginal sonography exhibited a heterogeneous hypoechoic shadow in the endometrium that suggested a hematometra including blood clots and tissue, and a multicystic echogenic mass, with flow at color Doppler ultrasonography, in the lateral wall of the uterus. A laparoscopic cornuostomy was performed. Pathologic analysis demonstrated placental tissue with features consistent with a partial molar pregnancy. Systemic methotrexate therapy was administered to treat the possible remnants of the molar pregnancy. Molar cornual ectopic pregnancy can be successfully treated with laparoscopic cornuostomy and systemic methotrexate therapy. PMID:20226416

Hwang, Jong Ha; Lee, Jae Kwan; Lee, Nak Woo; Lee, Kyu Wan

73

Molar ectopic pregnancy in the uterine cornus.  

UK PubMed Central (United Kingdom)

Cornual pregnancy is a rare form of ectopic pregnancy. The incidence of hydatiform molar pregnancy is 1 in 1000 to 2000 pregnancies. Molar cornual ectopic pregnancy is extremely rare. A 41-year-old nulliparous woman was admitted via the emergency department because of vaginal bleeding for 2 weeks. Transvaginal sonography exhibited a heterogeneous hypoechoic shadow in the endometrium that suggested a hematometra including blood clots and tissue, and a multicystic echogenic mass, with flow at color Doppler ultrasonography, in the lateral wall of the uterus. A laparoscopic cornuostomy was performed. Pathologic analysis demonstrated placental tissue with features consistent with a partial molar pregnancy. Systemic methotrexate therapy was administered to treat the possible remnants of the molar pregnancy. Molar cornual ectopic pregnancy can be successfully treated with laparoscopic cornuostomy and systemic methotrexate therapy.

Hwang JH; Lee JK; Lee NW; Lee KW

2010-03-01

74

Evaluation of Food Retention in Occlusal Surfaces of First Primary Molars/ Evaluación de la Retención de Alimentos en las Superficies Oclusales de los Primeros Molares Temporales  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Algunas características de los alimentos, como la viscosidad y consistencia, puede modificar el tiempo para el retiro de alimentos de la boca, así como favorecer la actividad de las bacterias cariogénicas, y el aumento de riesgo de caries dental. Este estudio tuvo como objetivos verificar la retención de alimentos en contacto con un sustrato cariogénico en niños de 24-30 meses de edad. 27 niños (54 dientes) fueron evaluados. Se realizo la ingesta de una galleta de (more) chocolate, y la zona de retención del alimento fue documentada por la fotografía digital en dos tiempos de experimentación (to: 0 y t1: 30 minutos) y se calculó utilizando el software Image Tool 3.0. El índice de superficie (mm2) de retención de alimentos fue estadísticamente reducido (test de Wilcoxon, p = 0,001) después de 30 minutos para molares maxilares (to: 0,37 ± 0,04 y t1: 0,042 ± 0,015) y mandibulares (to:0,30 ± 0,03 y t1: 0,078 ± 0,019). No se observaron diferencias en El índice de superficie de retención de alimentos entre los grupos en el tiempo inicial. En el momento final, los molares inferiores muestran una zona de retención superiores a los maxilares (prueba de Mann-Whitney, p = 0,04). La prevalencia de la retención de alimentos en los molares inferiores fue más alta que los molares superiores (Chi cuadrado, p = 0,03). En conclusión, los primeros molares mandibulares primarios retienen más alimentos que los molares superiores, siendo concordante con los resultados clínicos de la prevalencia de caries. Abstract in english Some food characteristics, like stickiness and consistency, can modify the time for food removal from the mouth as well as favors the activity of cariogenic bacteria, increasing dental caries risk. This study aimed to observe food retention in contact with a cariogenic substrate in 24-30 months old children. Therefore, 27 children (54 teeth) were evaluated. They intake a chocolate cookie and the food retention area was documented by digital photography in two experimental (more) times (to: 0 and t1: 30 minutes) and it was calculated using Image Tool 3.0 software. The food retention surface index (mm2) was statistically reduced (Wilcoxon’s test, p=0.001) after 30 minutes for both maxillary (to: 0.37 ± 0.04 and t1:0.042 ± 0.015) and mandibular (to: 0.30 ± 0.03 and t1: 0.078 ± 0.019) molars. No differences were observed between the groups in food retention surface index at the initial time. At the final time, the mandibular molars show a higher retention area than the maxillary ones (Mann-Whitney’s test, p=0.04). The prevalence of food retention at the mandibular molars is higher than the maxillary molars (Chi Square’s test, p=0.03). In conclusion, first primary mandibular molars retain more food than the maxillary molars, being in agreement with clinical results of dental caries’ prevalence.

Meneghel, L. L; Fernandes, K. B. P; Lara, S. M. H; Ferelle, A; Sturion, L; Walter, L. R. F

2010-09-01

75

[Correlation between the lower first permanent molar axis and the premature loss of temporary molars].  

UK PubMed Central (United Kingdom)

UNLABELLED: The aim of our study was to determine the impact of premature loss of temporary molars upon the longitudinal axis of the first permanent molar. MATERIAL AND METHOD: The study sample was formed by 94 orthopanthomografies of child patients with premature loss of lower temporary molars (first or second) after clinical eruption of the first permanent molar. All panoramic radiographs have been realized with the same panoramic unit with 1.4% magnification coefficient and were analyzed using a standardized technique of tracing the images of teeth and bone on matte acetate paper. It was evaluated the angle between longitudinal axis of first permanent lower molar and occlusal plane. RESULTS: It was observed that premature loss of lower second deciduous molar modifies greater the vertical axis of first permanent molar (between 61 degrees and 79 degrees) then premature loss of first lower primary molar. This is perhaps because the loss of space in the case of premature exfoliation of first primary molar is due more to distal drift of canine then mesial drift of molars. CONCLUSION: The drift to mesial of first permanent molar is more accentuated proportional with the age at which appeared premature loss and so it is loss of leeway space.

Petcu A; Maxim A; Haba D

2009-10-01

76

Acute inflammation at a mandibular solitary horizontal incompletely impacted molar  

Directory of Open Access Journals (Sweden)

Full Text Available Minoru Yamaoka, Yusuke Ono, Masahide Ishizuka, Yoko Hasumi-Nakayama, Ryosuke Doto, Kouichi Yasuda, Takashi Uematsu, Kiyofumi FurusawaOral and Maxillofacial Surgery, Matsumoto Dental University School of Dentistry, Shiojiri, Nagano, JapanAbstract: Acute inflammation is frequently seen in the elderly around incompletely impacted molars located apart from molars or premolars. To identify the factors causing acute inflammation in the solitary molars without second molars or without second and first molars, ages of patients and rates of acute inflammation in 75 horizontal incompletely impacted mandibular molars in contact or not in contact with molars in subjects 41 years old or older were studied using orthopantomographs. Acute inflammation was seen in nine third molars out of 48 third molars in contact with second molars (18.8%), whereas acute inflammation was seen in 11 molars out of 19 solitary molars without second molars or without first and second molars (57.9%) (p < 0.01). The mean age of 48 subjects with third molars in contact with the second molar was 50.42 ± 7.62 years, and the mean age of 19 subjects with isolated molars was 65.16 ± 10.41 years (p < 0.0001). These indicate that a solitary horizontal incompletely impacted molar leads more frequently to acute inflammation along with aging due to possible bone resorption resulting from teeth loss.Keywords: mandible, third molar, impaction, elderly, acute inflammation, solitary molar

Minoru Yamaoka; Yusuke Ono; Masahide Ishizuka; Yoko Hasumi-Nakayama; Ryosuke Doto; Kouichi Yasuda; Takashi Uematsu; Kiyofumi Furusawa

2009-01-01

77

A study of impacted love: kissing molars.  

UK PubMed Central (United Kingdom)

INTRODUCTION: "Kissing" or "rosetting" of molars refers to contacting occlusal surfaces of impacted permanent mandibular second, third, and, very rarely, fourth molars. It is a rare phenomenon. AIM: The aim of this study was to assess the incidence, dental involvement type, associated pathologies and treatment outcomes of kissing molars in all patients who underwent lower third molar surgery between March 2008 and October 2011, at a military hospital in Turkey. METHODS: The panoramic radiographs of the patients who underwent extraction of lower third molars at Marmara University Faculty of Dentistry, Gulhane Military Medical Academy and Surgical Infirmary at Commando Troop No. 5 Gokceada between March 2008 and October 2011 were analysed retrospectively. The patients found to have kissing molars (KM), were classified according to the teeth involved and associated pathologies were evaluated. RESULTS: Among nine patients (five female, four male) with a mean age of 27.4 years who were found to have KM, one presented with rosetting of first and second lower molars (Class I), six with rosetting of second and third lower molars (Class II), and two with rosetting of lower third and fourth molars (Class III). Three of the KM presented with dentigerous cyst formation and two with granulamatous changes of the adjacent dental follicle. Following surgical removal, three patients presented with mild paraesthesia of the lower lip, which resolved 3 to 6 months after the operation. CONCLUSIONS: KM is a rare phenomenon. Early surgical therapy is essential as this condition can cause serious complications, including formation of pathologies such as dentigerous cyst or destruction of the adjacent bone.

Gulses A; Varol A; Sencimen M; Dumlu A

2012-12-01

78

Pathology associated with the third molar.  

UK PubMed Central (United Kingdom)

Several studies have reported the prevalence of pathology associated with retained third molar teeth. Although most oral surgeons have encountered many patients with infection and lytic lesions associated with retained third molars, assessment of the frequency of abnormality around these teeth has previously been hampered by the lack of well-designed studies to investigate a subject so important to oral and maxillofacial surgeons. This article reviews what is known--and what isn't known--about pathologic conditions associated with both symptomatic and asymptomatic third molar teeth.

Campbell JH

2013-02-01

79

Litterfall, litter decomposition and nitrogen mineralization in old-growth evergreen and secondary deciduous Nothofagus forests in south-central Chile/ Aporte, descomposición de hojarasca y mineralización de nitrógeno en bosques siempreverdes de antiguo crecimiento y bosques secundarios deciduos, centro-sur de Chile  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Los ecosistemas forestales del sur de Chile presentan un gran valor ecológico pues constituyen una de las mayores áreas del hemisferio Sur con existencias de bosques templados lluviosos. Están sometidos a procesos de deforestación, invasión de especies exóticas, fragmentación e incremento de depositación de nitrógeno (N) atmosférico. Para apoyar su manejo sustentable se requiere de mayor conocimiento en el ciclo de nutrientes de estos ecosistemas. Se estudia la (more) dinámica de nutrientes en cuatro sitios de bosques lluviosos valdivianos de la precordillera de los Andes, centro-sur de Chile: un bosque siempreverde de antiguo crecimiento prístino y otro alterado, un bosque caducifolio secundario con manejo silvícola y otro sin. Durante el período octubre 2002 -septiembre 2006, se estimaron (i) masa de la hojarasca (cuatro años) y contenido de nutrientes de la hojarasca (un año), (ii) descomposición y dinámica de nutrientes de hojarasca (un año) y de la corteza de Saxegothaea conspicua, y (iii) mineralización neta de nitrógeno (N-min) en el suelo in situ (un año). El aporte de hojarasca en los cuatro sitios fluctúa desde 3.5 hasta 5.8 ton ha-1 año-1, y es temporalmente menor en bosque caducifolio manejado, respecto del caducifolio sin manejo. Además, presentan una estacionalidad en los siempreverdes que es diferente, respecto de los deciduos. La hojarasca se descompone más rápidamente (promedio 32 % pérdida de masa después de un año) que la corteza (8 %), pero no se presentaron diferencias significativas en la hojarasca. El N neto en la hojarasca de los bosques siempreverdes disminuye durante la descomposición, pero se incrementa en la hojarasca de los deciduos. La N-mineralización neta del suelo fue completa en el bosque siempreverde prístino, intermedia en los bosques deciduos y el más baja en el bosque siempreverde alterado. Dada la ausencia de réplicas en las parcelas, no puede ser demostrado el impacto definido del tipo de bosque o régimen de manejo en el ciclo interno de nutrientes. Sin embargo, los resultados sugieren que el manejo silvícola puede afectar el reciclaje de nutrientes por la alteración en la composición de especies y estructura del bosque, aun cuando en el bosque secundario deciduo una extracción selectiva de madera en tiempo reciente (cinco años), no afecta la descomposición de la hojarasca o los montos de mineralización del nitrógeno. Abstract in english South Chilean forest ecosystems represent one of the largest areas of old-growth temperate rainforests remaining in the Southern hemisphere and have a high ecological value, but suffer from deforestation, invasion by exotic species, fragmentation, and increasing atmospheric nitrogen (N) deposition. To support sustainable forest management, more knowledge is required on nutrient cycling of these ecosystems. Therefore, a descriptive study of nutrient dynamics was done in fo (more) ur Valdivian rainforests in the lower Andes range of south Chile: old-growth and altered evergreen stands and unmanaged and managed secondary deciduous stands. Time series were measured for (i) mass (four year) and nutrient content (N, K, Ca, and Mg; one year) of litterfall, (ii) decomposition and nutrient dynamics (N, C, K, Ca, Mg, and P; one year) of leaf litter and Saxegothaea conspicua bark litter, and (iii) in situ topsoil net N mineralization (one year). Litterfall in the four stands ranged from 3.5 to 5.8 ton ha-1 yr-1, was temporarily lower in the managed than in the unmanaged deciduous stand and had a different seasonality in the evergreen stands than in the deciduous stands. Leaf litter decomposed faster (on average 32 % mass loss after one year) than bark litter (8 %) but without significant differences between leaf litter types. Net N in evergreen leaf litter decreased during decomposition but increased in deciduous leaf litter. Net soil N mineralization was fastest in the pristine evergreen stand, intermediate in the deciduous stands and slowest in the altered evergreen forest.

STAELENS, JEROEN; AMELOOT, NELE; ALMONACID, LEONARDO; PADILLA, EVELYN; BOECKX, PASCAL; HUYGENS, DRIES; VERHEYEN, KRIS; OYARZÚN, CARLOS; GODOY, ROBERTO

2011-03-01

80

Molars and incisors: show your microarray IDs.  

UK PubMed Central (United Kingdom)

BACKGROUND: One of the key questions in developmental biology is how, from a relatively small number of conserved signaling pathways, is it possible to generate organs displaying a wide range of shapes, tissue organization, and function. The dentition and its distinct specific tooth types represent a valuable system to address the issues of differential molecular signatures. To identify such signatures, we performed a comparative transcriptomic analysis of developing murine lower incisors, mandibular molars and maxillary molars at the developmental cap stage (E14.5). RESULTS: 231 genes were identified as being differentially expressed between mandibular incisors and molars, with a fold change higher than 2 and a false discovery rate lower than 0.1, whereas only 96 genes were discovered as being differentially expressed between mandibular and maxillary molars. Numerous genes belonging to specific signaling pathways (the Hedgehog, Notch, Wnt, FGF, TGF?/BMP, and retinoic acid pathways), and/or to the homeobox gene superfamily, were also uncovered when a less stringent fold change threshold was used. Differential expressions for 10 out of 12 (mandibular incisors versus molars) and 9 out of 10 selected genes were confirmed by quantitative reverse transcription-PCR (qRT-PCR). A bioinformatics tool (Ingenuity Pathway Analysis) used to analyze biological functions and pathways on the group of incisor versus molar differentially expressed genes revealed that 143 genes belonged to 9 networks with intermolecular connections. Networks with the highest significance scores were centered on the TNF/NF?B complex and the ERK1/2 kinases. Two networks ERK1/2 kinases and tretinoin were involved in differential molar morphogenesis. CONCLUSION: These data allowed us to build several regulatory networks that may distinguish incisor versus molar identity, and may be useful for further investigations of these tooth-specific ontogenetic programs. These programs may be dysregulated in transgenic animal models and related human diseases leading to dental anomalies.

Laugel-Haushalter V; Paschaki M; Thibault-Carpentier C; Dembelé D; Dollé P; Bloch-Zupan A

2013-01-01

 
 
 
 
81

Autotransplantation of endodontically treated third molars.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To determine the success rate in autotransplantation of endodontically treated third molars. DESIGN: A descriptive study. PLACE AND DURATION OF STUDY: This study was carried out at Armed Forces Institute of Dentistry (AFID), Rawalpindi (Pakistan) from January 2002 to December 2002. PATIENTS AND METHODS: A total of 50 patients meeting the inclusion criteria were selected who had their first or second molars in unrestorable condition with intact third molars. The donor teeth were extracted after the preparation of recipient site. After endodontically treated in vitro the donor teeth were carried to the recipient site and immobilized. Postoperative variables were recorded and analyzed on SPSS version 10. RESULTS: The overall success rate after six months of the transplantation of third molars was 88% with complete root formation after endodontic treatment. All the patients(12%) who had complaints were more than 35 years of age. CONCLUSION: Third molars are good substitute for the unrestorable first or second molars and would be as effective as endosseous implants. The procedure is likely to have complications in the advanced age group.

Sobhi MB; Rana MJ; Manzoor MA; Ibrahim M; Tasleem-ul-Hudda

2003-07-01

82

Remoción de terceros molares mandibulares con asistencia endoscópica: Nota técnica de un nuevo procedimiento quirúrgico para prevenir lesiones del NAI y formación de defectos óseos Removal of mandibular third molars with endoscopic approach: Technical note of a new surgical procedure to avoid IAN damage and bone defect formation  

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Full Text Available La variada posición anatómica de los terceros molares mandibulares presenta importantes desafíos asociados a su profundidad y grado de inclinación. Las complicaciones más habituales del procedimiento quirúrgico convencional de extracción se relacionan con la extensa osteotomía y poca visualización del sitio quirúrgico, que pueden generar consecuencias post-quirúrgicas como inflamación, dolor, trismus, lesiones reversibles e irreversibles del nervio alveolar inferior (NAI) o nervio lingual, riesgo de fractura y formación de defectos periodontales del segundo molar. La implementación de soportes rígidos en la óptica endoscópica ha permitido utilizar esta tecnología para realizar abordajes mínimamente invasivos para remover terceros molares mediante accesos flapless con una mínima osteotomía de la zona oclusal, conservando la pared bucal y lingual a través de la visualización directa y magnificada del sitio quirúrgico, adaptable a los movimientos del paciente durante la intervención. En este reporte se presenta un nuevo procedimiento quirúrgico mínimamente invasivo a través de asistencia endoscópica para la conservación ósea en la remoción de terceros molares mandibulares con riesgo de lesión del nervio alveolar inferior.Anatomic variability of the position of mandibular third molars represents significant challenges associated with its depth and angulation. The most common complications of conventional surgical procedure are related to extensive osteotomy and poor visualization, which can cause postsurgical effects such as inflammation, pain, trismus, reversible and irreversible lesions of the inferior alveolar nerve (IAN) or lingual nerve, fracture risk and formation of a deep periodontal defect on the distal aspect of the second molar. The implementation of rigid endoscopy in optics has allowed to use this technology via a minimally invasive approach to remove third molars by a minimally occlusal flapless ostectomy, preserving the buccal and lingual walls through direct and magnified visualization of the surgical site, adaptable to the patient’s movements during the surgery. In this report, we present a new and minimally invasive procedure through endoscopic assistance for bone conservation in the removal of third molars at risk of inferior alveolar nerve injury.

R Fuentes; V Beltrán; M Cantín; W Engelke

2012-01-01

83

Subcutaneous emphysema during third molar surgery: a case report  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese A extração de terceiros molares é o procedimento cirúrgico mais comum na prática diária em cirurgia oral, e complicações podem ocorrer a despeito da habilidade e experiência do cirurgião. Complicações observadas durante ou após extração de terceiros molares podem incluir dor, edema, sangramento, infecção, perfuração de seio e dano nervoso. Felizmente, a incidência de tais eventos é baixa quando se emprega conduta adequada e boa técnica cirúrgica. O (more) enfisema subcutâneo associado à extração dentária ocorre quando o ar da turbina de alta rotação é forçado para dentro dos tecidos moles através de um retalho rebatido e invade os tecidos adjacentes, causando edema, crepitação à palpação, e eventualmente espalhando-se pelos espaços teciduais dos planos fasciais. Embora seja raro, o enfisema subcutâneo iatrogênico pode ter conseqüências sérias e com risco de morte. É necessário ter cuidado com o uso de turbinas de alta rotação durante a realização de procedimentos cirúrgicos orais. A penetração de ar nos tecidos faciais não está limitada às extrações dentárias, e pode ocorrer também por outras vias de acesso, tais como dentes tratados endodonticamente, periodonto e lacerações de tecidos moles intraorais. Quando ocorre, o enfisema subcutâneo deve ser diagnosticado rapidamente e tratado adequadamente para diminuir o risco de outras complicações. Este relato apresenta um caso de enfisema subcutâneo ocorrido durante a extração de um terceiro molar inferior com emprego de turbina de alta rotação. O manejo do caso é descrito e os aspectos relacionados ao diagnóstico e à prevenção desta complicação cirúrgica são discutidos. Abstract in english Extraction of third molars is the most common surgical procedure performed in oral surgery on a daily basis and, despite surgical skills and expertise, complications may occur. Complications observed during or after third molar removal may include pain, swelling, bleeding, infection, sinus perforation and nerve damage. Fortunately, with a proper management and a good surgical technique, the incidence of such events is low. Subcutaneous emphysema associated with dental ext (more) raction occurs when the air from the high-speed dental handpiece is forced into the soft tissue through the reflected flap and invades the adjacent tissues, leading to swelling, crepitus on palpation and occasionally spreading through the tissue spaces of the fascial planes. Although rare, iatrogenic subcutaneous emphysema can have serious and potentially life-threatening consequences. Care should be taken when using air-driven handpieces. The access of air into the facial tissues is not limited to tooth extractions, but may also occur through other portals of entrance, such as endodontically treated teeth, periodontium and lacerations of intraoral soft tissues. When subcutaneous emphysema occurs, it must be quickly diagnosed and properly managed to reduce the risk of further complications. This report presents a case of subcutaneous emphysema occurred during extraction of a mandibular third molar extraction with the use of an air turbine handpiece. Case management is described and issues relative to the diagnosis and prevention of this surgical complication are discussed.

Romeo, Umberto; Galanakis, Alexandros; Lerario, Francesco; Daniele, Gabriele Maria; Tenore, Gianluca; Palaia, Gaspare

2011-01-01

84

Traumatismos de veia cava inferior Inferior vena cava injuries  

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Full Text Available OBJETIVO: Avaliar a incidência, o perfil clínico e as estratégias operatórias dos ferimentos de Veia Cava Inferior (VCI). MÉTODOS: Foram analisados retrospectivamente os prontuários de 76 doentes com ferimento de VCI atendidos nos dois prontossocorros de Manaus, no período de janeiro de 1997 a julho de 2002. Mecanismo de lesão, mortalidade, estado hemodinâmico, índice de trauma abdominal penetrante (PATI), achados intra-operatórios e conduta cirúrgica foram estudados. RESULTADOS: Quarenta e nove (65%) doentes sofreram lesão por arma branca, 26 (34%) por arma de fogo e um por traumatismo abdominal fechado. Quarenta e um (54%) doentes sobreviveram. Quase todos chegaram acordados, entretanto 40% estavam hipotensos (pressão arterial sistólica BACKGROUND: Injuries of inferior vena cava (IVC) require immediate and definitive action. Our objective is to evaluate the incidence, the clinical findings and the operative approach to IVC injuries. METHODS: We retrospectively studied 76 patients with IVC injuries treated in two Emergency Hospitals of Manaus, AM, Brazil, from January 1997 to July 2002. Mechanisms of injuries, mortality, hemodynamic status, penetrating abdominal trauma index (PATI), intraoperative findings and surgical approach were among assessed data. RESULTS: Fourty-nine patients (65%) had stab wounds, 26 (34%) gunshot wounds, and one had blunt abdominal trauma. Fourty-one (54%) patients survived. Almost all patients entered the emergency room awake, although 40% were hypotensive (systolic blood pressure < 70 mmHg), and the penetrating abdominal trauma index average was above 40. At laparotomy, active retroperitoneal bleeding or an expanding retroperitoneal hematoma were detected in all cases. Caval injury was retro-hepatic in 21 patients, and infrahepatic in the other 55. The prevailing surgical approach was lateral repair in 65 patients. Atrial-caval shunting was tried in six patients, with only three survivals. CONCLUSIONS: We concluded that IVC injury remains a highly lethal injury and there is a close relationship with urban violence. This study emphasizes that successful outcome depends on prompt volume restoration, avoidance of hypothermia and a stratified selective surgical approach.

Cleinaldo de Almeida Costa; José Carlos Costa Baptista-Silva; Lana Márcia Esteves Rodrigues; Fabiana Lo Presti Mendonça; Thiago Silveira Paiva; Emil Burihan

2005-01-01

85

Third molar surgery: the patient's and the clinician's perspective  

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Full Text Available Abstract Background In this report, the problems of third molar surgery have been reviewed from the perspective of both patient and clinician; additionally an overall analysis of preoperative imaging investigations was carried out. Specifically, three main areas of interest were investigated: the prediction of surgical difficulty and potential complications; the assessment of stress and anxiety and finally the assessment of postoperative complications and the surgeon's experience. Findings In the first study, the prediction of surgical difficulty and potential injury to the inferior alveolar nerve was assessed. This was achieved by examining the patient's orthopantomograms and by using the Pederson Difficulty Index (PDI). Several radiological signs were identified and a classification tree was created to help predict the incidence of such event. In the second study, a prospective assessment addressing the patient's stress and anxiety pre-, intra- and postoperatively was employed. Midazolam was the active drug used against placebo. Objective and subjective parameters were assessed, including measuring the cortisol level in saliva. Midazolam was found to significantly reduce anxiety levels and salivary cortisol was identified as an accurate anxiety marker. In the third study, postoperative complications and the surgeon's experience were examined. Few patients in this study suffered permanent nerve dysfunction. Junior surgeons reported a higher complication rate particularly in trismus, alveolar osteitis, infection and paraesthesia over the distributions of the inferior alveolar and lingual nerves. In apparent contrast, senior surgeons reported higher incidence of postoperative bleeding. Discussion These studies if well employed can lead to favourable alteration in patient management and might have a positive impact on future healthcare service.

Jerjes Waseem; Upile Tahwinder; Kafas Panagiotis; Abbas Syedda; Rob Jubli; McCarthy Eileen; McCarthy Peter; Hopper Colin

2009-01-01

86

Do third molars weaken the mandibular angle?  

UK PubMed Central (United Kingdom)

OBJECTIVE: The purpose of this study is to estimate how is the magnitude of the impact of a mandibular third molar on the mandibular angle stiffness. STUDY DESIGN: It was performed a literature search on whole MEDLINE and LILACS data base to find articles that match the following inclusion criteria: cohort studies presenting data on patients with mandibular fractures and third molars; that had a similar angle fracture definition; and that present data available to be cross-classified in a statistic analysis. RESULTS: The sample was composed by 4 studies, involving 2533 patients from USA, Nigeria, Germany and Jordan, evaluated between 1976 and 2001. The analysis of the sample shows a relative risk for a mandibula to fracture, comparing patients with and without third molars, ranging from 1,18 to 2,25. The data of the sample was grouped because of the homogeneity of the articles methods. The estimated relative risk across the 4 studies was 1,94 (95% CI 1,6 - 2,35). CONCLUSIONS: The presence of a third molar may double the risk of an angle fracture of the mandible to occur. Even with this data, the present study cannot support conditions related to the third molar that may affect this impact. Further studies are necessary to discuss the true indication of removal of these teeth as a prophylactic measure in population groups more predisposed to fracture.

Bezerra TP; Studart-Soares EC; Pita-Neto IC; Costa FW; Batista SH

2011-08-01

87

Molar Pregnancy Presents as Tubal Ectopic Pregnancy  

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Full Text Available Gestational trophoblastic disease is a spectrum of trophoblastic diseases that includes: Complete molar pregnancy (CMP), partial molar pregnancies (PMP), invasive mole (IM), chorioncarcinoma (CHC), and placental site trophoblastic tumors (PSTT). Hydatidiform moles are abnormal gestations characterized by the presence of hydropic changes affecting some or all of the placental villi. Hydatidiform moles arise as a result of an abnormal fertilization. In this report, the patient was a 28 year old Albanian woman who had induction of ovulation with Clomid. The majority of molar gestations arise within the uterine cavity.The occurrence of a hydatidiform mole within ectopic gestational tissue is rare. It is important to differentiate a hydatidiform mole from an ectopic pregnancy, particularly in infertile women who have a history of ovulation induction.

Merita Alushani; Ermira Kasa

2013-01-01

88

Endodontics in primary molars using ultrasonic instrumentation.  

UK PubMed Central (United Kingdom)

PURPOSE: The purpose of this study, which is a series of consecutive case reports, was to describe and evaluate the protocol used in the treatment of pulpal necrosed of primary molars, used by the dental service of Social Support Foundation of the Moinhos de Vento Hospital, Porto Alegre, RS, Brazil. METHODS: Eighteen primary molars in 15 children, ranging from 4 to 10 years of age, were endodontically treated using ultrasonic instrumentation. RESULTS: Clinical and radiographic controls showed a success rate of 94%, considering an evaluation time of 14.1+/-6.3 months. CONCLUSIONS: The use of ultrasonic instrumentation in primary molars with pulpal necrosis succeeded in reducing appointment time and showed a high success rate.

da Costa CC; Kunert GG; da Costa Filho LC; Kunert IR

2008-01-01

89

Má oclusão Classe I de Angle tratada com extrações de primeiros molares permanentes/ Angle Class I malocclusion treated with extraction of first permanent molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese A má oclusão Classe I de Angle é caracterizada por uma relação anteroposterior normal nos molares, que pode ou não estar acompanhada por alterações esqueléticas - nos planos vertical ou transverso - ou dentárias. A biprotrusão, revelada pela inclinação acentuada dos incisivos superiores e inferiores para vestibular, somada ao trespasse horizontal excessivo, faz com que o paciente fique mais exposto a traumas dentários, além de causar comprometimento estéti (more) co. A escolha dos dentes a serem extraídos para a correção, geralmente, recai sobre os primeiros ou segundos pré-molares, devido à sua posição na arcada. Contudo, a extração do primeiro molar permanente, em função de algum comprometimento, por cárie ou restauração extensa, pode ser uma alternativa, proporcionando a manutenção de um dente hígido em detrimento de outro já manipulado. O presente caso, tratado de maneira incomum, pela extração dos quatro primeiros molares permanentes, foi apresentado à Diretoria do Board Brasileiro de Ortodontia e Ortopedia Facial (BBO), representando a categoria 2, como parte dos requisitos para a obtenção do título de diplomado pelo BBO. Abstract in english Angle Class I malocclusion is characterized by normal anteroposterior molar relationship, which may or may not be accompanied by skeletal changes-in the vertical or transverse planes-or dental changes. Bimaxillary dental protrusion, characterized by pronounced labial inclination of maxillary and mandibular incisors combined with excessive overjet, expose patients to dental trauma and compromise aesthetics. In deciding which teeth to extract for Class I correction the firs (more) t or second premolars are usually selected due to their location in the dental arch. However, the extraction of a first permanent molar compromised by caries or extensive restoration may be an alternative that ensures the preservation of a healthy tooth instead of one that has already been manipulated. This case, treated in an unusual manner by the extraction of four first permanent molars, was presented to the Brazilian Board of Orthodontics and Dentofacial Orthopedics (BBO) as representative of category 2, as part of the requirements for obtaining the BBO diplomate title.

Silva, Ivan Tadeu Pinheiro da

2010-08-01

90

Estudo morfológico da polpa de molares de ratos Wistar frente a uma oclusão traumática experimental/ Morphological study of the pulp of Wistar rats molars under experimental occlusal interference  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese As alterações morfológicas pulpares, decorrentes de um estímulo externo experimental (interferência oclusal), foram estudadas, em nível de microscopia de luz. Utilizaram-se restaurações de amálgama, em sobreoclusão nos primeiros molares superiores direitos de dez ratos Wistar, divididos em 3 grupos e sacrificados por perfusão transcardíaca com formol a 10%, aos 10, 20 e 30 dias. A avaliação foi feita nos molares inferiores direitos (lado experimental) e esqu (more) erdos (lado controle). As peças ósseas após descalcificação em solução de EDTA associada às microondas, seguiram técnica histológica de rotina e coloração por hematoxilina-eosina e tricrômico de Mallory. Verificou-se no lado controle uma reação intensa caracterizada por um posicionamento atípico dos odontoblastos, seguida pelo aparecimento de cálculos pulpares e posteriormente por uma aparente e uniforme acomodação tecidual em toda a polpa, com moderada incidência de fibras colágenas. No lado experimental, as alterações foram similares parecendo, porém, aumentar com o tempo, principalmente aos 30 dias, onde a imagem histológica era semelhante à do lado controle aos 10 dias. Os resultados obtidos permitiram concluir que a interferência oclusal provocou alterações no tecido conjuntivo pulpar tanto no lado experimental como no controle e que as mesmas foram proporcionais à direção dos movimentos mandibulares. Abstract in english Pulpal morphological alterations in mandibular molars of rats, resulting from an experimental external stimulus (occlusal interference), were studied using light microscopy. We placed amalgam restorations in supraocclusion in the right superior first molars of 10 Wistar rats divided into three groups, which were sacrificed by transcardiac perfusion with 10% formalin, after 10, 20 and 30 days. The evaluation of the right (experimental side) and left (control side) inferior (more) molars was made after decalcification of the bony specimens with EDTA solution associated with microwaves, followed by routine histologic technique and staining with HE and Mallory?s Trichrome. On the control side, an intense reaction characterized by an atypical positioning of the odontoblasts was observed, followed by the appearance of pulp stones and, subsequently, by an apparent and uniform accommodation of the tissue in the whole pulp, with moderate incidence of collagenous fibers. On the experimental side, the alterations were similar, but they apparently increased with time, specially after 30 days, when the histologic image was similar to that of the control side after 10 days. We can conclude that the occlusal interference induces alterations in the pulpal connective tissue both on the experimental side and on the control side, and they are proportional to the direction of the mandibular movements.

PENNA, Luiz Alberto Plácido; RODE, Sigmar de Mello

2000-06-01

91

Morphometric analysis of developing crowns of maxillary primary second molars and permanent first molars in humans.  

UK PubMed Central (United Kingdom)

The purpose of this study was firstly to characterize the changes occurring in size and form of the mineralizing maxillary second primary molar and first permanent molar crowns, and secondly to determine if similar changes in size and form characterize enamel apposition in the crowns of these teeth. Twenty-five primary second molars and 20 maxillary permanent first molars at various stages of development, found in archaeological excavations in Israel, were examined for a number of measured variables using image analyser software. Teeth were divided into two groups according to their stage of development: stage I included all teeth at an early stage of development in which mesiobuccal-cusp height was less than 5 mm for the primary molar and 5.9 mm for the permanent molar; stage 2 included all teeth in later stages of development where mesiobuccal-cusp height was greater than these values. In the primary molar, a significant increase was found between the two stages in almost all variables. Significant correlations were also found between all intercusp distances and the external variables. Strong correlations between height of the mesiobuccal cusp and all external and internal variables were noted in stage 1, but fewer in stage 2. In the permanent tooth, no increase was observed in intercusp distances and very few correlations were found between and among the variables. The results suggest that a change in the shape of the maxillary primary second molar occurs during formation, with the lingual cusp tips moving lingually and distally, and the distobuccal cusp tips moving distally. No change occurs in the shape of the maxillary permanent first molar during crown formation. Growth of the maxillary primary second and permanent first molar crowns occurs in 'bursts' of development.

Peretz B; Nevis N; Smith P

1998-07-01

92

Mandibular first molar with four distal canals.  

Science.gov (United States)

A mandibular first molar with more than four canals is an interesting example of anatomic variations, especially when four of these canals are located in distal roots. This report describes a case of a mandibular first molar with six canals (two mesial and four distal canals in two distal roots). The canals were equipped with a K-file and irrigated with NaOCl (5.25%) and normal saline as the final irrigant. The canals were filled laterally with gutta percha and AH26 sealer (De Trey, Dentsply, Switzerland). This case shows a rare anatomic configuration and points out the importance of looking for additional canals. PMID:18037064

Ghoddusi, Jamileh; Naghavi, Neda; Zarei, Mina; Rohani, Ehsan

2007-10-22

93

[Pit sealing of deciduous and permanent molars. In vivo evaluation  

UK PubMed Central (United Kingdom)

The authors studied a fissure sealant retention in deciduous molars and first permanent molars. The assessment of the sealant retention was performed at six months intervals. After eighteen months study period a greater sealant on the deciduous molars was observed, in a decreasing order as follow: upper and lower first permanent molars. It was also shown that greatest loss of sealant occurred on the disto occlusal pit of the upper first permanent molars.

Prado C; Garone Netto N

1990-10-01

94

High obstruction of inferior vena cava  

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Two cases with high obstruction of the inferior vena cava are reported. In one case the obstruction was caused by a metastasis from colonic carcinoma and in the other case the obstruction was supposed to be congenital. The angiographic and phlebographic findings are discussed as well as the flow pattern that will suggest such a high obstruction of the inferior vena cava.

Duarte, V.; Lunderquist, A.

1983-02-01

95

[Diagnosis of molar pregnancy by hysteroscopy].  

UK PubMed Central (United Kingdom)

BACKGROUND: Gestational trophoblastic disease has a high incidence worldwide. Proper pre-evacuation diagnosis must be performed due to the risk of malignant complications associated with hydatidiform moles. Diagnosis of early molar pregnancies might be elusive due to atypical clinical manifestations and inconclusive ultrasonographic findings. OBJECTIVE: Report on the efficiency and precision by hysteroscopy for the diagnosis of molar pregnancy in one particular case. CLINICAL CASE: Thirty-year old woman, 5.6-week pregnant, suffering from pelvic pain, uterine bleeding and high concentrations of human chorionic gonadotropin beta fraction (beta-hCG). Ultrasonography suggested inconclusively either a hematoma or a gestational sac so that further evaluation by hysteroscopy had to be performed in order to reach a proper diagnosis. RESULTS: Hysteroscopic evaluation provided conclusive diagnostic images of hydropic degeneration of the chorionic villi. Histopathological evaluation confirmed a molar pregnancy. The mole was removed by uterine curettage and beta-hCG tests followed. CONCLUSIONS: Hysteroscopy is a useful tool for diagnostic protocol in case of early atypical molar pregnancy.

Ayala Yáñez R; Briones Landa C; Anaya Coeto H; Leroy López L

2012-08-01

96

Ectopic molar pregnancy: a case report.  

UK PubMed Central (United Kingdom)

The incidence of hydatidiform moles is 1 per 1,000 pregnancies. Ectopic pregnancy occurs in 20 per 1,000 pregnancies. Thus, the incidence of the ectopic molar gestation is very rare. We report a case of tubal molar pregnancy diagnosed at the systematic histology exam of an ectopic pregnancy. We report the case of 32 years old nulliparus women who presented a vaginal bleeding, lower abdominal pain and 6 weeks amenorrhea corresponding to the last menstrual period. At the clinical examination, the arterial pressure was 100/60 mmHG. The gynecological examination was difficult because of lower abdominal pain. Serum gonadotropin activity was 3454 ui/l. Pelvic ultrasound revealed an irregular echogenic mass in the left adnexa. Diagnostic laparoscopy revealed a left-sided unruptured ampullary ectopic pregnancy. A left laparoscopic salpingectomy was performed. The systematic histologic test identified an ectopic partial molar pregnancy, which was confirmed by DNA ploidy image analysis. The patient was followed with weekly quantitative B-hCG titers until three successive B-hCG levels were negative. It is pertinent that clinicians take routine histological examination of tubal specimens in ectopic pregnancy very seriously in order to diagnose cases of ectopic molar gestations early and mount appropriate post treatment surveillance.

Bousfiha N; Erarhay S; Louba A; Saadi H; Bouchikhi C; Banani A; El Fatemi H; Sekkal M; Laamarti A

2012-01-01

97

Ectopic molar pregnancy: a case report.  

Science.gov (United States)

The incidence of hydatidiform moles is 1 per 1,000 pregnancies. Ectopic pregnancy occurs in 20 per 1,000 pregnancies. Thus, the incidence of the ectopic molar gestation is very rare. We report a case of tubal molar pregnancy diagnosed at the systematic histology exam of an ectopic pregnancy. We report the case of 32 years old nulliparus women who presented a vaginal bleeding, lower abdominal pain and 6 weeks amenorrhea corresponding to the last menstrual period. At the clinical examination, the arterial pressure was 100/60 mmHG. The gynecological examination was difficult because of lower abdominal pain. Serum gonadotropin activity was 3454 ui/l. Pelvic ultrasound revealed an irregular echogenic mass in the left adnexa. Diagnostic laparoscopy revealed a left-sided unruptured ampullary ectopic pregnancy. A left laparoscopic salpingectomy was performed. The systematic histologic test identified an ectopic partial molar pregnancy, which was confirmed by DNA ploidy image analysis. The patient was followed with weekly quantitative B-hCG titers until three successive B-hCG levels were negative. It is pertinent that clinicians take routine histological examination of tubal specimens in ectopic pregnancy very seriously in order to diagnose cases of ectopic molar gestations early and mount appropriate post treatment surveillance. PMID:22655097

Bousfiha, Najoua; Erarhay, Sanaa; Louba, Adnane; Saadi, Hanan; Bouchikhi, Chahrazad; Banani, Abdelaziz; El Fatemi, Hind; Sekkal, Med; Laamarti, Afaf

2012-04-04

98

Pulpotomías de molares temporales en pulpas muertas con tintura de propóleos al 10% Pulpotomies of dead pulps in temporal molars using 10% propolis tinction.  

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Full Text Available Se realizó un ensayo clínico fase II aleatorizado comparado en 50 niños de 4 a 10 años que presentaron molares temporales con muerte pulpar, los cuales acudieron a la Clínica Estomatológica Provincial de Santiago de Cuba entre septiembre del 2005 y septiembre del 2006, con el objetivo de demostrar la eficacia de la tintura de propóleos al 10 % en pulpotomías (necropulpotomías). Se conformaron 2 grupos de tratamientos de 26 pacientes cada uno: en el grupo A se empleó tintura de propóleos al 10 % y en el B el formocresol. Los pacientes se evaluaron a los 7, 15 y 30 días, sin observarse diferencias ni reacciones adversas. El grupo dentario más tratado fue el constituido por los segundos molares temporales inferiores, donde la tintura de propóleos al 10 % en las pulpotomías, resultó ser tan eficaz como el formocresol, por lo que se recomienda incluir en tratamientos endodónticos esta nueva terapéutica.A comparative phase II randomized clinical assay of 50 children aged 4 to 10 years, who presented with temporal molars with dead pulp and were seen at the Provincial Dental Clinic of Santiago de Cuba from September 2005 to September 2006, was conducted to confirm the effectiveness of 10% propolis tinction in pulpotomies (necropulpotomies). Two groups of 26 patients were formed; group A used 10% propolis tinction and group B was treated with formocresol. The patients were evaluated at 7th , 15th and 30th days; neither difference nor adverse reaction was observed. The most treated dental group was the second lower temporal molars where 10% propolis tinction in pulpotomies proved to be as effective as formocresol, so it was recommended to include this new therapy in the endodontic treatment.

Walkyria del Carmen González Rodríguez; Marcia Hortensia Corona Carpio; Mayra Raquel Martínez Ramos; Marylena García Milanés; Leonardo Núñez Antúnez

2007-01-01

99

Inferior dermal flap in immediate breast reconstruction.  

UK PubMed Central (United Kingdom)

BACKGROUND: The inferior dermal flap can be used in conjunction with implants or tissue expanders to avoid need for acellular dermal matrix in breast reconstruction and on occasion can serve as an alternative to an autologous flap by functioning as a reconstructed breast mound. Candidates for this procedure are women with high BMI or breast ptosis who desire a decrease in breast size at time of mastectomy with reconstruction. This procedure recruits the de-epithelialized excess skin inferiorly and laterally from a skin-sparing mastectomy and uses this to eliminate the need for acellular dermal matrix in a cost-conscious environment. METHODS: The skin-sparing mastectomy is performed, and the inferior skin flap is de-epithelialized to create the inferior dermal pedicle. A gel implant is placed retropectorally, and the inferior dermal flap is sutured to the inferior border of the pectoralis major muscle and laterally to a muscle-sparing serratus pedicle to provide support and coverage of the implant. RESULTS: We have performed this procedure in several patients and present a video outlining the technique of this procedure in a 54-year-old female diagnosed with left breast DCIS. Postoperative pictures taken at 6 weeks showed an excellent cosmetic result without complications. CONCLUSIONS: The inferior dermal flap is a simple and reproducible procedure that can reduce cost by eliminating the use of acellular dermal matrix. It provides an excellent cosmetic outcome in women undergoing mastectomy with large BMI and breast ptosis seeking reduction in breast size.

Torstenson T; Boughey JC; Saint-Cyr M

2013-10-01

100

Litterfall, litter decomposition and nitrogen mineralization in old-growth evergreen and secondary deciduous Nothofagus forests in south-central Chile Aporte, descomposición de hojarasca y mineralización de nitrógeno en bosques siempreverdes de antiguo crecimiento y bosques secundarios deciduos, centro-sur de Chile  

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Full Text Available South Chilean forest ecosystems represent one of the largest areas of old-growth temperate rainforests remaining in the Southern hemisphere and have a high ecological value, but suffer from deforestation, invasion by exotic species, fragmentation, and increasing atmospheric nitrogen (N) deposition. To support sustainable forest management, more knowledge is required on nutrient cycling of these ecosystems. Therefore, a descriptive study of nutrient dynamics was done in four Valdivian rainforests in the lower Andes range of south Chile: old-growth and altered evergreen stands and unmanaged and managed secondary deciduous stands. Time series were measured for (i) mass (four year) and nutrient content (N, K, Ca, and Mg; one year) of litterfall, (ii) decomposition and nutrient dynamics (N, C, K, Ca, Mg, and P; one year) of leaf litter and Saxegothaea conspicua bark litter, and (iii) in situ topsoil net N mineralization (one year). Litterfall in the four stands ranged from 3.5 to 5.8 ton ha-1 yr-1, was temporarily lower in the managed than in the unmanaged deciduous stand and had a different seasonality in the evergreen stands than in the deciduous stands. Leaf litter decomposed faster (on average 32 % mass loss after one year) than bark litter (8 %) but without significant differences between leaf litter types. Net N in evergreen leaf litter decreased during decomposition but increased in deciduous leaf litter. Net soil N mineralization was fastest in the pristine evergreen stand, intermediate in the deciduous stands and slowest in the altered evergreen forest. Given the absence of replicated stands, the definite impact of forest type or management regime on the internal nutrient cycling cannot be demonstrated. Nevertheless, the results suggest that management can affect nutrient turnover by altering species composition and forest structure, while recent (five years) selective logging in secondary deciduous forest did not affect litter decomposition or N mineralization rates in the present study.Los ecosistemas forestales del sur de Chile presentan un gran valor ecológico pues constituyen una de las mayores áreas del hemisferio Sur con existencias de bosques templados lluviosos. Están sometidos a procesos de deforestación, invasión de especies exóticas, fragmentación e incremento de depositación de nitrógeno (N) atmosférico. Para apoyar su manejo sustentable se requiere de mayor conocimiento en el ciclo de nutrientes de estos ecosistemas. Se estudia la dinámica de nutrientes en cuatro sitios de bosques lluviosos valdivianos de la precordillera de los Andes, centro-sur de Chile: un bosque siempreverde de antiguo crecimiento prístino y otro alterado, un bosque caducifolio secundario con manejo silvícola y otro sin. Durante el período octubre 2002 -septiembre 2006, se estimaron (i) masa de la hojarasca (cuatro años) y contenido de nutrientes de la hojarasca (un año), (ii) descomposición y dinámica de nutrientes de hojarasca (un año) y de la corteza de Saxegothaea conspicua, y (iii) mineralización neta de nitrógeno (N-min) en el suelo in situ (un año). El aporte de hojarasca en los cuatro sitios fluctúa desde 3.5 hasta 5.8 ton ha-1 año-1, y es temporalmente menor en bosque caducifolio manejado, respecto del caducifolio sin manejo. Además, presentan una estacionalidad en los siempreverdes que es diferente, respecto de los deciduos. La hojarasca se descompone más rápidamente (promedio 32 % pérdida de masa después de un año) que la corteza (8 %), pero no se presentaron diferencias significativas en la hojarasca. El N neto en la hojarasca de los bosques siempreverdes disminuye durante la descomposición, pero se incrementa en la hojarasca de los deciduos. La N-mineralización neta del suelo fue completa en el bosque siempreverde prístino, intermedia en los bosques deciduos y el más baja en el bosque siempreverde alterado. Dada la ausencia de réplicas en las parcelas, no puede ser demostrado el impacto definido del tipo de bosque o régimen de manejo en el ciclo interno de nutrient

JEROEN STAELENS; NELE AMELOOT; LEONARDO ALMONACID; EVELYN PADILLA; PASCAL BOECKX; DRIES HUYGENS; KRIS VERHEYEN; CARLOS OYARZÚN; ROBERTO GODOY

2011-01-01

 
 
 
 
101

Actitud terapéutica ante sacos foliculares de terceros molares incluídos/ Therapeutic approach to impacted third molar follicles  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish El quiste dentígero o folicular es un quiste odontogénico del desarrollo. Está revestido por el epitelio del folículo dentario, y suele estar en relación con un diente permanente incluído. Presentamos el caso clínico de un paciente en el que se observa la aparición de un quiste dentígero a partir del saco folicular de un tercer molar incluído no exodonciado, y lo comparamos con la evolución de un cordal incluído y su saco folicular contralaterales en los que s (more) e realizó la exodoncia. El tratamiento definitivo del quiste dentígero asociado a un tercer molar incluído es quirúrgico, con la exodoncia de la pieza y enucleación del quiste. Los sacos foliculares mayores de 2 mm asociados a terceros molares incluídos evolucionan en numerosas ocasiones a quistes foliculares. Está indicada la exodoncia de dichos cordales para evitar la evolución a quiste dentígero. Abstract in english The dentigerous cyst or follicular cyst is a developmental odontogenic cyst. It is covered by the epithelium of the dental follicle, and it tends to be related to an impacted permanent tooth. The case report of a patient who was seen to develop a dentigerous cyst arising from the follicle of an impacted non-extracted third molar is presented. This is then compared with the evolution of the contralateral impacted third molar and its follicle that was extracted. The definit (more) ive treatment for a dentigerous cyst associated with an impacted third molar is surgical, the extraction of the tooth and enucleation of the cyst. Follicles measuring more+ than 2 mm and that are associated with impacted third molars often develop into follicular cysts. The extraction of these third molars is indicated in order to avoid the development of a dentigerous cyst

González García, R.; Escorial Hernández, V.; Capote Moreno, A.; Martos Díaz, P.L.; Sastre Pérez, J.; Rodríguez Campo, F.J.

2005-04-01

102

Actitud terapéutica ante sacos foliculares de terceros molares incluídos Therapeutic approach to impacted third molar follicles  

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Full Text Available El quiste dentígero o folicular es un quiste odontogénico del desarrollo. Está revestido por el epitelio del folículo dentario, y suele estar en relación con un diente permanente incluído. Presentamos el caso clínico de un paciente en el que se observa la aparición de un quiste dentígero a partir del saco folicular de un tercer molar incluído no exodonciado, y lo comparamos con la evolución de un cordal incluído y su saco folicular contralaterales en los que se realizó la exodoncia. El tratamiento definitivo del quiste dentígero asociado a un tercer molar incluído es quirúrgico, con la exodoncia de la pieza y enucleación del quiste. Los sacos foliculares mayores de 2 mm asociados a terceros molares incluídos evolucionan en numerosas ocasiones a quistes foliculares. Está indicada la exodoncia de dichos cordales para evitar la evolución a quiste dentígero.The dentigerous cyst or follicular cyst is a developmental odontogenic cyst. It is covered by the epithelium of the dental follicle, and it tends to be related to an impacted permanent tooth. The case report of a patient who was seen to develop a dentigerous cyst arising from the follicle of an impacted non-extracted third molar is presented. This is then compared with the evolution of the contralateral impacted third molar and its follicle that was extracted. The definitive treatment for a dentigerous cyst associated with an impacted third molar is surgical, the extraction of the tooth and enucleation of the cyst. Follicles measuring more+ than 2 mm and that are associated with impacted third molars often develop into follicular cysts. The extraction of these third molars is indicated in order to avoid the development of a dentigerous cyst

R. González García; V. Escorial Hernández; A. Capote Moreno; P.L. Martos Díaz; J. Sastre Pérez; F.J. Rodríguez Campo

2005-01-01

103

[Selective catheterization of the inferior petrosal sinus  

UK PubMed Central (United Kingdom)

The inferior petrosal sinus is a dura sinus which traverses laterally and dorsally from the dorsal aspect of the cavernous sinus. It represents the nearest catheterization point for blood sampling from the pituitary gland. Inferior petrosal sinus venous sampling is used for diagnosis and lateralization of ACTH-secreting and growth hormone-producing hypophyseal adenomas. It is also used in the differential diagnosis of ectopic production of ACTH or other similar peptides. We briefly describe the anatomy of the inferior petrosal sinus and the catheterization technique, based on our experience from 15 patients. The endocrinological results are published in a separate article.

Stiris MG; Enge IP

1994-08-01

104

Selective transarterial embolization with n-butyl-2-cyanoacrylate for the treatment of arterial hemorrhage after third molar extraction.  

UK PubMed Central (United Kingdom)

INTRODUCTION: Comprehensive reports concerning selective embolization for arterial bleeding from third molar removal have not been published. We analyzed cases of arterial bleeding from third molar extraction that required transarterial embolization, and we demonstrate representative cases. METHODS: Five consecutive patients (three men and two women, aged 24 to 37 years) who underwent transarterial embolization at our institution were included in this study. Four of them showed postoperative bleeding after lower third molar removal, and one suffered bleeding after upper third molar extraction. The period of time from extraction to embolization varied from 5 h to 5 weeks. RESULTS: Angiography revealed pseudoaneurysms at the inferior alveolar artery in four cases and at the superior alveolar artery in one case. The pseudoaneurysms were selectively embolized using 25-33 % n-butyl-2-cyanoacrylate (NBCA)-lipiodol. All of the cases showed good results angiographically and clinically. Transit hypoesthesia at the region of the mental nerve was observed in one patient. CONCLUSION: Selective transarterial embolization is an effective technique for arterial bleeding from third molar removal when it is difficult to obtain hemostasis by dental procedures. Injection of NBCA can be useful when the alveolar artery is too small to embolize with coils.

Sagara Y; Kiyosue H; Tanoue S; Shimada R; Hongo N; Kohno T; Kawano K; Mori H

2013-06-01

105

Cell ploidy in molar placental disease.  

UK PubMed Central (United Kingdom)

Molar diseases of the placenta is associated with cystic change in the villi. The cysts may be from 5-20+ mm in diameter. This disease has been described in association with triploid and diploid cell lines and with and without an accompanying embryo or fetus. It may be followed by malignant change and invasive chorio-carcinoma. In order to investigate the association between cell ploidy, embryonic development and subsequent malignancy, a detailed study of 30 conceptuses with molar disease was made, with the accompanying maternal history and follow-up. The cell ploidy was determined by measurement of nuclei by a cytoscan light microscope connected to a computer program as has been previously described. Diploid cell lines were not found with embryonic or fetal development. Triploid cell lines were always associated with an embryo or fetus. Triploidy is not associated with hyperplastic changes in the trophoblast. These results are presented and discussed.

Poland BJ; Baillie DL

1978-10-01

106

Cell ploidy in molar placental disease.  

Science.gov (United States)

Molar diseases of the placenta is associated with cystic change in the villi. The cysts may be from 5-20+ mm in diameter. This disease has been described in association with triploid and diploid cell lines and with and without an accompanying embryo or fetus. It may be followed by malignant change and invasive chorio-carcinoma. In order to investigate the association between cell ploidy, embryonic development and subsequent malignancy, a detailed study of 30 conceptuses with molar disease was made, with the accompanying maternal history and follow-up. The cell ploidy was determined by measurement of nuclei by a cytoscan light microscope connected to a computer program as has been previously described. Diploid cell lines were not found with embryonic or fetal development. Triploid cell lines were always associated with an embryo or fetus. Triploidy is not associated with hyperplastic changes in the trophoblast. These results are presented and discussed. PMID:715729

Poland, B J; Baillie, D L

1978-10-01

107

Determination of the molar absorptivity of NADH.  

UK PubMed Central (United Kingdom)

The molar absorptivity of NADH at 340 nm has been determined by an indirect procedure in which high-purity glucose is phosphorylated by ATP in the presence of hexokinase, coupled to oxidation of the glucose-6-phosphate by NAD+ in the presence of glucose-6-phosphate dehydrogenase. The average value from 85 independent determinations is 6317 liter mol-1 cm-1 at 25 degrees C and pH 7.8. The overall uncertainty is -4.0 to +5.5 ppt (6292 to 6352 liter mol-1 cm-1), based on a standard error of the mean of 0.48 ppt and an estimate of systematic error of -2.6 to +4.1 ppt. Effects of pH, buffer, and temperature on the molar absorptivity are also reported.

McComb RB; Bond LW; Burnett RW; Keech RC; Bowers GN Jr

1976-02-01

108

Dens in dente of maxillary third molar  

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Full Text Available ?Dens in dente,? also known as dens invaginatus, is a developmental anomaly resulting from deepening or invagination of the enamel organ into the dental papilla, which begins at the crown and often extends to the root before calcification of the dental tissues. Dens in dente commonly occur in the maxillary lateral incisor. This article reports a case of dens in dente in the maxillary third molar.

Subramaniam Arun; Kamtane Smita; Desai Rajiv; Thakre Gauri

2008-01-01

109

Aetiological factors of molar incisor hypomineralization  

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Full Text Available Introduction. Teeth hypomineralization that involves molars only, or molars and incisors is known as disease Molar Incisor Hypomineralization (MIH). Aetiology of MIH is not known, however, factors responsible for this disease are present in the first year of life. The aim of this research was to identify possible aetiological factors responsible for the occurrence of this disease. Material and Methods. The study included eight years old children from the municipality of Foca. Parents who gave their consent for the participation of children in the study completed a questionnaire in which they listed aetiological factors described in the literature to be responsible for the emergence of hypomineralization. Modified DDE index (Modified DDE Index for Use in Epidemiological Surveys) was used to estimate hypomineralization on all teeth; however, MIH changes were classified separately. Results. More than ninety different factors may be responsible for enamel defects. Possible aetiological factors listed in the literature are: premature birth, low weight of newborns, hypoxia, metabolic disorder of calcium and phosphate, fever, genetic factors, etc. Results did not confirm statistical significance for any of examined aetiological factors. Conclusion. In this study a retrospective analysis of data was performed. Etiological factors of MIH were identified but the most responsible for MIH were not determined.

Jankovi? Svjetlana; Ivanovi? Mirjana; Davidovi? Bojana; Le?i? Jelena

2013-01-01

110

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00:00:24 WOMAN 1: The diagnosis of breast cancer is shocking for anybody and ...

111

Breast Reconstruction: Deep Inferior Epigastric Perforator  

Medline Plus

Full Text Available BREAST RECONSTRUCTION: DEEP INFERIOR EPIGASTRIC PROCEDURE BETH ISRAEL MEDICAL CENTER NEW YORK, NY January 11, 2008 00: ... Over the next hour, live from Beth Israel Medical Center in New York City, you'll hear ...

112

Sarcoma of the vena cava inferior  

International Nuclear Information System (INIS)

[en] Authors present an infrequent case of a female patient with abdominal tumor a great superficial collateral circulation type cava-cava, the abdominal ultrasound, the transthoracic and transesophageal echocardiogram and the computerized axial tomography (CAT) identified a tumor of the vena cava inferior. The fine-needle aspiration cytology of lesion confirmed the presence of primary fusopleomorphous sarcoma of high degree of malignancy of vena cava inferior

2010-01-01

113

Piezosurgery for the lingual split technique in mandibular third molar removal: a suggestion.  

UK PubMed Central (United Kingdom)

BACKGROUND: The lingual split technique is a surgical procedure for extraction of impacted mandibular third molar throughout a lingual approach. The main disadvantage of this technique is the high rate of temporary lingual nerve injury mainly because of the trauma induced by the lingual flap retraction. The purpose of this paper is to suggest the use of piezosurgery in performing the lingual cortical plate osteotomy of the third molar alveolar process. METHODS: Surgical procedure was performed under general anesthesia, and it lasted approximately 60 minutes. After the buccal and lingual full-thickness flaps were incised and elevated, a piezosurgical device was used for osteotomy. A well-defined bony window was then removed, and it allowed the entire tooth was extracted in a lingual direction. The patient did not show any neurological postoperative complication. Lingual and inferior alveolar nerve functionality was normal before as well as after surgery. CONCLUSIONS: The use of piezoelectric surgery seems to be a good option in removing lower third molars when a lingual access is clearly indicated. The only disadvantage of this technique can be represented by an operating time lengthening possibly because of a lower power cut of the piezoelectric device, to the high mineralization of the mandibular cortical bone and to the use of inserts with a low degree of sharpening.

Pippi R; Alvaro R

2013-03-01

114

Prevalência de perda precoce de molares decíduos: estudo retrospectivo - DOI: 10.4025/actascihealthsci.v30i2.3943 Prevalence of early loss of deciduous molars: a retrospective study  

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Full Text Available Este estudo retrospectivo determinou a prevalência da perda precoce de molares decíduos em pacientes atendidos na clínica de Odontopediatria da Universidade Estadual da Paraíba. Foram examinados 515 prontuários, sendo os dados registrados em um formulário. Foram analisadas as variáveis: gênero, idade, tipo de molar decíduo perdido, arcada dentária (maxilar ou mandibular) e lado (direito e esquerdo). Observou-se que a prevalência de perda precoce foi de 15,1%, existindo uma distribuição similar entre os gêneros. Em relação à idade da criança, a maior freqüência de perda acometeu pacientes com sete anos (32,1%). Houve distribuição equitativa da perda dentária entre as arcadas superior e inferior, com 43,6% cada uma, sendo o lado esquerdo o mais acometido (41%). O segundo molar superior esquerdo foi o mais acometido (17,9%), seguido do primeiro molar decíduo superior direito (16,1%). Pode-se concluir que a prevalência de perda precoce foi baixa e que os molares decíduos superiores foram os dentes mais comumente perdidos.This retrospective study determined the prevalence of early loss of deciduous molars in patients enrolled at the Pediatric Dentistry clinic at the State University of Paraíba. A review of 515 patient records were analyzed, registered in a form. The following variables were analyzed: gender, age, type of deciduous molar loss, region (maxilla or mandible) and side (right and left). It was observed that the prevalence of early tooth loss was 15.1% and there was a similar distribution between the genders. In regard to age, the greatest frequency of tooth loss involved patients at 7 years old (32.1%). There was a similar distribution of tooth loss between the maxilla and mandible regions, at 43.6% each, with the left side being the most involved (41%). The second upper left deciduous molar was the most commonly missing tooth (17.9%), followed by the first upper right deciduous molar (16.1%). It can be concluded that the prevalence of early loss was lower and that the upper primary molars were the most commonly missing teeth.

Alessandro Leite Cavalcanti; Suyanne Amorim Menezes; Ana Flávia Granville-Garcia; Luciana Barros Correia Fontes

2008-01-01

115

Skeletal stability after inferior maxillary repositioning without interpositional graft.  

UK PubMed Central (United Kingdom)

True vertical maxillary deficiency is a characteristic of short face syndrome. In these patients, inferior repositioning of the maxilla (IRM) is indicated to improve facial aesthetics and function, but this procedure has been described as the most unstable. The aim of this study was to evaluate the long term, post surgical stability of IRM, fixed with four 2.0mm L-shaped miniplates, without any type of graft. A cephalometric study was performed, analysing linear measurements (anterior nasal spine, the A point, top of the incisor, top of the buccal-mesial cusp of the first molar, and posterior nasal spine on an X-Y coordinate system) traced immediately preoperatively, immediately postoperatively and at least 6 months post operatively. Eight young adult patients who underwent IRM were studied. The average results of this study were: surgical movement of 4.65 mm at I point, 5.32 mm at anterior nasal spine (ANS) point, and 4.70 mm at A point and relapses of 1.60 mm (35%), 2.23 mm (43%) and 2.10 mm (46%), respectively. It was concluded, that IRM using this type of internal rigid fixation without graft is unstable.

Santos SE; Moreira RW; de Moraes M; Asprino L; Araujo MM

2012-04-01

116

[Ectopic molar tooth in the maxillary sinus].  

Science.gov (United States)

The development of intranasal ectopic teeth is rare. Although they are more commonly seen in the palate and maxillary sinus, they can also be found in the mandibular condyle, coronoid process, and nasal cavity. A 30-year-old male patient presented with a complaint of headache. Computed tomography of the paranasal sinuses showed a bony mass in the right maxillary sinus wall, 1 cm in size. He did not have any history of maxillofacial trauma or operation. The mass was removed via a Caldwell-Luc procedure. It looked like a tooth. Histopathologic diagnosis was made as ectopic molar tooth. The patient was asymptomatic two weeks after the operation. PMID:18187979

Altun, Hüseyin; Teker, Ay?enur Meriç; Ceran, Murat; Gedikli, Orhan

2007-01-01

117

Molar Pregnancy Presents as Tubal Ectopic Pregnancy  

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Full Text Available Hydatidiform moles are abnormal gestations characterized by the presence of hydropic changesaffecting some or all of the placental villi. Hydatidiform moles arise as a result of the fertilizationof an abnormal ovum. In this report, the patient was a 29 year old Asian woman who had inductionof ovulation with letrozol. Since the majority of molar gestations arise within the uterine cavitythus the occurrence of a hydatidiform mole within ectopic gestational tissue is rare. It is importantto differentiate a hydatidiform mole from a conventional ectopic pregnancy, particularly in infertilewomen who have a history of ovulation induction.

Fatemeh Davari Tanha; Elham ShirAli; Haleh Rahmanpour; Fediey Haghollahi

2011-01-01

118

Functional organization of the left inferior precentral sulcus: dissociating the inferior frontal eye field and the inferior frontal junction.  

UK PubMed Central (United Kingdom)

Two eye fields have been described in the human lateral frontal cortex: the frontal eye field (FEF) and the inferior frontal eye field (iFEF). The FEF has been extensively studied and has been found to lie at the ventral part of the superior precentral sulcus. Much less research, however, has focused on the iFEF. Recently, it was suggested that the iFEF is located at the dorsal part of the inferior precentral sulcus. A similar location was proposed for the inferior frontal junction area (IFJ), an area thought to be involved in cognitive control processes. The present study used fMRI to clarify the topographical and functional relationship of the iFEF and the IFJ in the left hemispheres of individual participants. The results show that both the iFEF and the IFJ are indeed located at the dorsal part of the inferior precentral sulcus. Nevertheless, the activations were spatially dissociable in every individual examined. The IFJ was located more towards the depth of the inferior precentral sulcus, close to the junction with the inferior frontal sulcus, whereas the iFEF assumed a more lateral, posterior and superior position. Furthermore, the results provided evidence for a functional double dissociation: the iFEF was activated only in a comparison of saccades vs. button presses, but not in a comparison of incongruent vs. congruent Stroop conditions, while the opposite pattern was found at the IFJ. These results provide evidence for a spatial and functional dissociation of two directly adjacent areas in the left posterior frontal lobe.

Derrfuss J; Vogt VL; Fiebach CJ; von Cramon DY; Tittgemeyer M

2012-02-01

119

Functional organization of the left inferior precentral sulcus: dissociating the inferior frontal eye field and the inferior frontal junction.  

Science.gov (United States)

Two eye fields have been described in the human lateral frontal cortex: the frontal eye field (FEF) and the inferior frontal eye field (iFEF). The FEF has been extensively studied and has been found to lie at the ventral part of the superior precentral sulcus. Much less research, however, has focused on the iFEF. Recently, it was suggested that the iFEF is located at the dorsal part of the inferior precentral sulcus. A similar location was proposed for the inferior frontal junction area (IFJ), an area thought to be involved in cognitive control processes. The present study used fMRI to clarify the topographical and functional relationship of the iFEF and the IFJ in the left hemispheres of individual participants. The results show that both the iFEF and the IFJ are indeed located at the dorsal part of the inferior precentral sulcus. Nevertheless, the activations were spatially dissociable in every individual examined. The IFJ was located more towards the depth of the inferior precentral sulcus, close to the junction with the inferior frontal sulcus, whereas the iFEF assumed a more lateral, posterior and superior position. Furthermore, the results provided evidence for a functional double dissociation: the iFEF was activated only in a comparison of saccades vs. button presses, but not in a comparison of incongruent vs. congruent Stroop conditions, while the opposite pattern was found at the IFJ. These results provide evidence for a spatial and functional dissociation of two directly adjacent areas in the left posterior frontal lobe. PMID:22155041

Derrfuss, J; Vogt, V L; Fiebach, C J; von Cramon, D Y; Tittgemeyer, M

2011-12-01

120

Restauraciones cerámicas en molares jóvenes con endodoncia/ Ceramics restorations in young molars with endodontic  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Objetivo: Efectuar restauraciones cerámicas Cerec (feldespática y de dióxido de circonio) en molares jóvenes con endodoncia, para prevenir complicaciones en el aparato estomatognático por la pérdida de estos dientes. Material y métodos: Se describe la confección de restauraciones cerámicas a nivel de la zona molar mandibular derecha de un paciente del género femenino de 18 años de edad, a quien se le realizó radiografía periapical, por presentar dolor espont? (more) ?neo en el lado derecho mandibular. Se diagnosticó una pulpitis irreversible en el primer y segundo molar que fue tratada endodónticamente. Las restauraciones cerámicas de ambos molares fueron confeccionadas con los sistemas CAD/CAM Cerec y evaluadas clínicamente a los 6 y 12 meses, de acuerdo a los criterios establecidos por el Servicio de Salud Pública de los Estados Unidos (USPHS). Resultados: La evaluación clínica evidenció que las estructuras de cerámica feldespática y de dióxido de circonio ofrecen en el lapso evaluado, adecuada forma anatómica, adaptación marginal, estabilidad en el color, ausencia de caries recidiva a nivel de dientes del sector posterior con tratamiento endodóntico y aceptación del paciente. Abstract in english Purpose: Make a ceramic restoration (feldsphatic and zirconium dioxide) in young molars with endodontic treatment, to prevent further complications in the stomatognathic apparatus for the loss of these teeth. Material and methods: It describes the making of ceramic restorations in the right mandibular molar area to a female patient of 18 years old, to whom it was made a periapical radiography, for presenting spontaneous pain on the mandibular right side. It was diagnosed (more) as an irreversible pulpitis at the first and second molar, that were treated endodontically. The ceramic restorations of both molars were made with the Cerec CAD/CAM system and were examined after 6 and 12 months in accordance with the US Public Health Service (USPHS) criteria at baseline. Results: The clinical evaluation showed that the structures of feldspathic ceramic and zirconium dioxide in the offer period evaluated presented, proper anatomical shape, marginal adaptation, color stability, absence of recurrence cavities in the posterior teeth with endodontic treatment and acceptance of the patient.

Urdaneta Quintero, M.; Yánez de Meléndez, L.; Álvarez Zárraga, J.; Jimeno Jiménez, M.; Soto Mestre, C.

2009-12-01

 
 
 
 
121

Restauraciones cerámicas en molares jóvenes con endodoncia Ceramics restorations in young molars with endodontic  

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Full Text Available Objetivo: Efectuar restauraciones cerámicas Cerec (feldespática y de dióxido de circonio) en molares jóvenes con endodoncia, para prevenir complicaciones en el aparato estomatognático por la pérdida de estos dientes. Material y métodos: Se describe la confección de restauraciones cerámicas a nivel de la zona molar mandibular derecha de un paciente del género femenino de 18 años de edad, a quien se le realizó radiografía periapical, por presentar dolor espontáneo en el lado derecho mandibular. Se diagnosticó una pulpitis irreversible en el primer y segundo molar que fue tratada endodónticamente. Las restauraciones cerámicas de ambos molares fueron confeccionadas con los sistemas CAD/CAM Cerec y evaluadas clínicamente a los 6 y 12 meses, de acuerdo a los criterios establecidos por el Servicio de Salud Pública de los Estados Unidos (USPHS). Resultados: La evaluación clínica evidenció que las estructuras de cerámica feldespática y de dióxido de circonio ofrecen en el lapso evaluado, adecuada forma anatómica, adaptación marginal, estabilidad en el color, ausencia de caries recidiva a nivel de dientes del sector posterior con tratamiento endodóntico y aceptación del paciente.Purpose: Make a ceramic restoration (feldsphatic and zirconium dioxide) in young molars with endodontic treatment, to prevent further complications in the stomatognathic apparatus for the loss of these teeth. Material and methods: It describes the making of ceramic restorations in the right mandibular molar area to a female patient of 18 years old, to whom it was made a periapical radiography, for presenting spontaneous pain on the mandibular right side. It was diagnosed as an irreversible pulpitis at the first and second molar, that were treated endodontically. The ceramic restorations of both molars were made with the Cerec CAD/CAM system and were examined after 6 and 12 months in accordance with the US Public Health Service (USPHS) criteria at baseline. Results: The clinical evaluation showed that the structures of feldspathic ceramic and zirconium dioxide in the offer period evaluated presented, proper anatomical shape, marginal adaptation, color stability, absence of recurrence cavities in the posterior teeth with endodontic treatment and acceptance of the patient.

M. Urdaneta Quintero; L. Yánez de Meléndez; J. Álvarez Zárraga; M. Jimeno Jiménez; C. Soto Mestre

2009-01-01

122

Partial inferior turbinectomy using the microdebrider.  

UK PubMed Central (United Kingdom)

BACKGROUND: A microdébrider was selected to accomplish partial inferior turbinectomy, allowing for controlled and rapid removal of hypertrophic soft tissue while preserving the general turbinate form. OBJECTIVE: To assess the clinical outcome, healing, and any adverse consequences from the microdébrider partial turbinectomy procedure. SETTING: A public hospital in north-central Israel. DESIGN: A nonrandomized prospective study of 35 adults who were referred for nasal airway surgery, including turbinectomy. METHODS: All patients underwent bilateral inferior turbinate reduction with the microdébrider, with removal of mucosa from the medial and inferior portions of the inferior turbinates. Detailed follow-up was accomplished at 4 or more months postoperatively, including a visual analogue scale questionnaire and videoendoscopy. For seven patients, pre- and postoperative mucosal biopsies were available to evaluate healing and epithelial regeneration. RESULTS: Nasal endoscopy showed well-healed turbinate membranes and preservation of the turbinate form, with widening of the inferomedial nasal airway space. Subjective nasal patency improved after surgery, p < .01, and the subjective sense of smell was improved, p < .01, without associated crusting, pain, irritation, sneezing, or dryness. Postoperative biopsies showed subepithelial fibrosis and regenerated epithelium, generally of respiratory differentiation. CONCLUSION: Inferior turbinate reduction can be accomplished efficiently with the microdébrider device, without undue side effects. SIGNIFICANCE: Further experience and long-term follow-up with this technique are warranted.

Wexler D; Braverman I

2005-06-01

123

Electro-acupuncture efficacy on pain control after mandibular third molar surgery  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese O objetivo desta pesquisa foi verificar a eficácia da aplicação de eletro-acupuntura (EAC) na redução da dor após a exodontia de terceiros molares inferiores inclusos. Foram selecionados 24 pacientes jovens (12 homens e 12 mulheres) com inclusão bilateral de terceiros molares inferiores em posição similar. Cada paciente foi submetido aleatoriamente a dois procedimentos cirúrgicos em dias diferentes: em um deles o dente foi extraído com uma sessão pré-operató (more) ria (24 h) e uma pós-operatória imediata de EAC enquanto no outro a extração foi feita sem EAC. A EAC foi aplicada em 6 pontos sistêmicos bilaterais e 2 auriculares com um aparelho WQ10D1 utilizando freqüência de 40-60 Hz por 20 min com intensidade ajustada individualmente. A dor foi avaliada desde 2h até 72h pós-operatórias utilizando a escala visual análoga (EVA) de 100 mm e pelo consumo de analgésicos. Os dados foram comparados pelo teste deWilcoxon. Os escores de dor da EVA foram significantemente menores para o tratamento com EAC (p Abstract in english The aim of this study was to evaluate the efficacy of electro-acupuncture (EAC) on postoperative pain control after mandibular third molar surgery. Twenty four young patients (12 male and 12 female) with symmetrically impacted mandibular third molars were selected. Each patient was submitted to two separate surgical procedures under local anesthesia. At one side, extraction was carried out employing both prior (24h) and immediately postoperative application of EAC, while (more) on the contralateral side surgery was carried out without any treatment. EAC was applied on 6 bilateral systemic and 2 auricular points with a WQ10Dl appliance using 40-60Hz frequency for 20 min and individually adjusted intensity. Postoperative pain intensity was rated on a 100 mm visual analog scale (VAS) between 2 and 72 h and recording the amount of analgesics intake after surgery. Statistical analysis was performed using theWilcoxon test. Postoperative pain VAS scores were significantly lower for the EAC group (p

Tavares, Marconi Gonzaga; Machado, Ana Paula; Motta, Breno Gutierrez; Borsatto, Maria Cristina; Rosa, Adalberto Luiz; Xavier, Samuel Porfírio

2007-01-01

124

Bilateral accessory inferior turbinates and secondary middle turbinates.  

UK PubMed Central (United Kingdom)

Bifid inferior nasal turbinates-two inferior turbinates with a single root observed in the nasal cavity-are an extremely rare anatomical variation, especially when they are observed bilaterally and exist with other variations. We report a case of bilateral bifid inferior nasal turbinates with bilateral secondary middle turbinates. We discuss the findings of this rare condition and suggest an appropriate term-accessory inferior turbinate-to replace bilateral inferior turbinate by reason of its embryology.

Lee SY; Bae KE; Lee HB; Cho WH; Kim JH; Cho HS; Lee JH

2012-07-01

125

Positional changes of the third molar in orthodontically treated patients.  

UK PubMed Central (United Kingdom)

UNLABELLED: OBJECTIVE AND RATIONALE: Over the years, the effects of the third molars eruption on the dental arches have been studied extensively. Still, literature provides less data regarding the effects of the orthodontic treatment on the third molars position. The aim of our study was to assess the positional changes of the third molars relative to the occlusal plane and to the second molar long axis, changes occurred during orthodontic treatment performed with or without premolar extractions. METHOD: This study included 20 orthodontic treated patients: 10 of them with premolar extractions and 10 without premolar extractions. The pretreatment and post treatment panoramic radiographs were analyzed, and the angles between the third molar long axis and the occlusal plane and between the long axis of the third molar and the long axis of the second molar were measured. RESULTS: Changes in third molar position, from pretreatment to post treatment, for the two groups of patients were evaluated by using the Student's t-test. The results of the statistical analysis revealed an improvement in third molars position, the best results were seen in the lower third molars, in the group of patients treated with premolar extractions.

Mihai AM; Lulache IR; Grigore R; Sanabil AS; Boiangiu S; Ionescu E

2013-06-01

126

Mineral Content in Teeth with Deciduous Molar Hypomineralisation (DMH).  

UK PubMed Central (United Kingdom)

Objectives we report the mineral (hydroxyapatite) density of sound and opaque areas in DMH molars with sound parts of (carious) deciduous teeth serving as controls. Methods Twenty-nine extracted second primary molars obtained from fifteen children were studied. Thirteen of these molars were DMH molars with yellow opacities, seven were DMH molars with white opacities, three DMH molars with brown opacities and eleven were molars without DMH. Prior to microCT scanning, the teeth were mounted in impression material (Impregum®) and stored in water with a thymol crystal. Spot analysis and line scans were performed in areas with opacities and in sound areas. An ANOVA test and t-tests were used to test if there were significant differences between the groups. Results The average densities of the hydroxyapatite in yellow and brown opacities (1368mg HA/cm(2) and 1407mg HA/cm(2) respectively) were significantly lower than in clinically unaffected enamel (1747mg HA/cm(2)) of DMH molars or of sound molars (1758mg HA/cm(2)). The mineral density in white opacities (1737mg HA/cm(2)) was not different from that in the enamel of sound molars. The mineral density values in yellow and brown enamel opacities were in between those of dentin (1018mg HA/cm(2)) and enamel. Conclusions DMH molars with yellow or brown opacities had a 20-22% lower mineral density in the hypomineralised enamel compared with sound molars. White opacities do not show a lower mineral content. The reduction in enamel mineral content in DMH molars stressed the need for a preventive approach in DMH.

Elfrink M; Ten Cate J; van Ruijven L; Veerkamp J

2013-09-01

127

A simplified approach to true molar intrusion  

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Full Text Available Abstract Background Orthodontic management of anterior open bites is a demanding task for orthodontists. Molar intrusion as a primary means of open bite correction entails the need for appropriate anchorage. Orthodontic mini implants can provide the required mechanical support. The suggested procedure aims to reduce the risk of complications such as root damage or soft tissue irritations while minimizing overall complexity. Methods Three female patients aged 14, 18 and 19 years who decided against a surgical correction were treated with a device consisting of mini implants in the palatal slope, a palatal bar and intrusion cantilevers. Results In all three patients, an open bite reduction of more than a millimeter occurred within four months. An anterior overbite of 2 mm or more could be established within 6 to 9 months. Conclusions The method presented in this article enables the practitioner to use mini implants in an easily accessible insertion site. A lab-side procedure is optional but not required.

Flieger Stefanie; Ziebura Thomas; Kleinheinz Johannes; Wiechmann Dirk

2012-01-01

128

Partial Invasive Molar Pregnancy –2 Case Reports  

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Full Text Available Gestational trophoblastic disease encompasses several entities like complete mole , partial mole , invasive mole , gestational trophoblastic carcinoma and trophoblastic carcinoma from implantation site . These entities are different from each other by their origins , morphology , their evolution and their treatment. Among all components partial mole is very common (90%) and triploid genetically. This is one of the important causative factors of miscarriages. Very rarely (2-4%) partial mole can develop into invasive one presenting with features of incomplete abortion , missed abortion and sometimes as obstetric emergencies like intra peritoneal hemorrhage and torrential vaginal bleeding .So proper diagnosis and timely intervention can prevent mortality and reduce morbidity of the patients. Here we report two such cases of partial invasive molar pregnancies with varied picture .

Debasmita Mandal; Nupur Nandi; Ram Prasad Dey; Ranu Roy Biswas; Amiya K.Bhattacharya; Subhash C. Biswas

2010-01-01

129

Molar extinction coefficients of some fatty acids  

DEFF Research Database (Denmark)

The attenuation of gamma rays in some fatty acids, viz. formic acid (CH2O2), acetic acid (C2H4O2), propionic acid (C3H6O2), butyric acid (C4H8O2), n-hexanoic acid (C6H12O2), n-caprylic acid (C8H16O2), lauric acid (C12H24O2), myristic acid (C14H28O2), palmitic acid (C16H32O2), oleic acid (C18H34O2) and stearic acid (C18H36O2), has been measured at the photon energies 81, 356, 511, 662, 1173 and 1332 keV. Experimental values for the molar extinction coefficient, the effective atomic number and the electron density have been derived and compared with theoretical calculations. There is good agreement between experiment and theory.

Sandhu, G.K.; Singh, K.

2002-01-01

130

Amoxicillin may cause molar incisor hypomineralization.  

UK PubMed Central (United Kingdom)

The etiology of molar incisor hypomineralization (MIH) is unclear. Our hypothesis was that certain antibiotics cause MIH. We examined 141 schoolchildren for MIH and, from their medical files, recorded the use of antibiotics under the age of 4 yrs. MIH was found in 16.3% of children. MIH was more common among those children who had taken, during the first year of life, amoxicillin (OR=2.06; 95% CI, 1.01-4.17) or the rarely prescribed erythromycin (OR=4.14; 95% CI, 1.05-16.4), compared with children who had not received treatment. Mouse E18 teeth were cultured for 10 days with/without amoxicillin at concentrations of 100 microg/mL-4 mg/mL. Amoxicillin increased enamel but not dentin thickness. An altered pattern of amelogenesis may have interfered with mineralization. We conclude that the early use of amoxicillin is among the causative factors of MIH.

Laisi S; Ess A; Sahlberg C; Arvio P; Lukinmaa PL; Alaluusua S

2009-02-01

131

A simplified approach to true molar intrusion.  

UK PubMed Central (United Kingdom)

BACKGROUND: Orthodontic management of anterior open bites is a demanding task for orthodontists. Molar intrusion as a primary means of open bite correction entails the need for appropriate anchorage. Orthodontic mini implants can provide the required mechanical support. The suggested procedure aims to reduce the risk of complications such as root damage or soft tissue irritations while minimizing overall complexity. METHODS: Three female patients aged 14, 18 and 19 years who decided against a surgical correction were treated with a device consisting of mini implants in the palatal slope, a palatal bar and intrusion cantilevers. RESULTS: In all three patients, an open bite reduction of more than a millimeter occurred within four months. An anterior overbite of 2 mm or more could be established within 6 to 9 months. CONCLUSIONS: The method presented in this article enables the practitioner to use mini implants in an easily accessible insertion site. A lab-side procedure is optional but not required.

Flieger S; Ziebura T; Kleinheinz J; Wiechmann D

2012-01-01

132

Leiomyosarcoma of the inferior vena cava  

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Vascular leiomyosarcoma (LMS) are unique. The inferior vena cava (IVC) is the most affected organ (about 38% cases). We report the observation of a 50-year old woman who consulted for right upper quadrant pain. Imaging studies revealed a retroperitoneal mass that mimic a LMS of the IVC. The patient ...

Ben Abid Sadri; Attaoui Mohamed Amine; Mzoughi Zeineb; Miloudi Nizar; Gharbi Lassad; Mohamed Tahar Khalfallah

133

Clinical effectiveness of coblation inferior turbinate reduction.  

UK PubMed Central (United Kingdom)

OBJECTIVE: We sought to determine the safety and clinical effectiveness of coblation (short for "cold ablation") inferior turbinate reduction for turbinate hypertrophy. METHODS: A consecutive series of adult patients with inferior turbinate hypertrophy were treated with the coblation technique in the office setting. Subjective symptoms were assessed prior to treatment and at the 3- and 6-month intervals after treatment with the Rhinosinusitis Symptom Inventory (RSI) and a short nasal symptom questionnaire. RESULTS: Twenty-four of 26 treated patients completed the protocol. At the 3-month follow-up, statistically significant decreases in the nasal and overall symptom domains of the RSI were noted (changes of -10.5 and -8.7, with P = 0.018 and P = 0.015, respectively). These improvements were also significant at the 6-month follow-up (-20.1 and -15.8 with, P < 0.001 and P < 0.001, respectively). At the 3-month interval, nasal obstruction and amount of time with nasal obstruction were significantly decreased (P = 0.006 and P = 0.011, respectively). These decreases remained statistically significant and slightly larger in magnitude at 6 months (P = 0.001 and P = 0.006, respectively). Postoperative epistaxis occurred in 2 of 24 (8.3%) of patients. CONCLUSION: Coblation inferior turbinate reduction is an effective procedure for inferior turbinate hypertrophy. The clinical benefit persists at 6 months after the procedure.

Bhattacharyya N; Kepnes LJ

2003-10-01

134

Bilateral inferior petrosal sinus sampling with desmopressin.  

UK PubMed Central (United Kingdom)

In this technical note, the use of desmopressin to stimulate pituitary adrenocorticotropic hormone secretion in place of the commercially available corticotropin releasing hormone (CRH) in bilateral inferior petrosal sinus sampling is described. Although the use of CRH is the standard of practice, it is currently unavailable in the USA and desmopressin provides reliable results with no additional observed side effects.

Deipolyi AR; Hirsch JA; Oklu R

2013-09-01

135

Bilateral inferior petrosal sinus sampling with desmopressin.  

Science.gov (United States)

In this technical note, the use of desmopressin to stimulate pituitary adrenocorticotropic hormone secretion in place of the commercially available corticotropin releasing hormone (CRH) in bilateral inferior petrosal sinus sampling is described. Although the use of CRH is the standard of practice, it is currently unavailable in the USA and desmopressin provides reliable results with no additional observed side effects. PMID:22735860

Deipolyi, Amy R; Hirsch, Joshua A; Oklu, Rahmi

2012-06-26

136

Two-year results of vital pulp therapy in permanent molars with irreversible pulpitis: an ongoing multicenter randomized clinical trial.  

UK PubMed Central (United Kingdom)

OBJECTIVES: Oral healthcare expenses are increasing rapidly as a result of the growth of high-cost health technologies worldwide. In many developing/developed countries, low-cost tooth extraction is the alternative treatment option for a high-cost root canal therapy (RCT) for management of human molars with irreversible pulpitis. Vital pulp therapy with calcium-enriched mixture cement (VPT/CEM) as a new alternative treatment option has demonstrated excellent treatment outcomes up to 1 year; if 2-year radiographic/clinical effectiveness as well as cost-effectiveness of the VPT/CEM is also non-inferior compared with RCT, it can serve as a viable treatment for mature molars with irreversible pulpitis. MATERIALS AND METHODS: In this prospective, multicenter (n?=?23), non-inferiority clinical trial, 407 patients were randomized to either one-visit RCT (n?=?202) or VPT/CEM (n?=?205) for 27 months. In this part of study, the primary outcome measure was the 2-year clinical and radiographic treatment outcomes. Cost-effectiveness was also analyzed. RESULTS: Mean follow-up times were 24.62?±?0.72 and 24.61?±?0.69 months in RCT (n?=?166) and VPT/CEM (n?=?166) arms, respectively. Clinical success rates in the two study arms were equal (98.19 %); however, radiographic success rates were 79.5 and 86.7 % in RCT and VPT/CEM arms, respectively, with no statistical difference (P?=?0.053). The treatment time span mean was approximately three times greater in the RCT than in the VPT/CEM arm (94.07 vs. 31.09 min; P?molar tooth compared with 44.5K for VPT. CONCLUSIONS: VPT/CEM reduced time and cost spent. When considering clinical as well as cost-effectiveness of VPT/CEM, this treatment option is not only non-inferior but also superior to RCT in mature permanent molar teeth with established irreversible pulpitis. CLINICAL RELEVANCE: Vital pulp therapy with CEM is a cost-effective and reliable biological technique for endodontic treatment of permanent molar teeth with irreversible pulpitis and can be recommended for general clinical practice.

Asgary S; Eghbal MJ; Ghoddusi J

2013-05-01

137

Disección septal tras infarto de miocardio inferior/ Septal dissection after inferior acute myocardial infarction  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish La disección del septum interventricular y su rotura constituyen una posible causa de la comunicación interventricular luego de un infarto de miocardio. En esta presentación se describe el caso de un varón de 68 años con un infarto agudo de miocardio inferior que fue intervenido en forma satisfactoria de un seudoaneurisma septal diagnosticado intraoperatoriamente. Abstract in english Septal dissection after inferior acute myocardial infarction Septal dissection and rupture are a possible cause of ventricular septal defect after acute myocardial infarction. This presentation reports the case of a 68 year-old man with inferior acute myocardial infarction, who was satisfactorily operated of a septal pseudoaneurysm diagnosed intraoperatively

Sánchez, Eladio; Cid-Cumplido, Manuela; Tarhini, Ibrahim S; Pineda, Tomás; González, José F

2012-08-01

138

Displacement of maxillary third molar into the lateral pharyngeal space.  

UK PubMed Central (United Kingdom)

Iatrogenic tooth displacement is a rare complication during extraction of impacted molars, but displacement of a maxillary third molar into the maxillary sinus, infratemporal fossa, buccal space, pterygomandibular space, and lateral pharyngeal space has been reported. Currently, 6 published reports describe third molar displacement into the lateral pharyngeal space, only 1 of which involved the loss of a maxillary third molar into this area, which occurred after an attempted self-extraction by the patient. There have been no reported cases of iatrogenic displacement of the maxillary third molar during an extraction procedure. This article describes the recovery, under general anesthesia, of a maxillary third molar from the lateral pharyngeal space after an iatrogenic displacement.

Lee D; Ishii S; Yakushiji N

2013-10-01

139

Intraosseous course of the inferior alveolar (dental) nerve and its relative position in the mandible.  

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Full Text Available The present study was planned to evaluate the position of the mandibular foramen (MF) and the course of the inferior alveolar nerve in 12 right and 14 left cadaveric hemimandibles. The soft tissue including the muscle attachments of the mandible was cleaned and the inferior neurovascular bundle was dissected up to the MF. The distances from the MF to the angle, symphysis menti, 3rd molar, and the lower point of the mandibular notch were measured. The bone was chiseled from its lingual surface to expose the mandibular canal. The distances from the nerve to the alveolar and inferior borders were measured. The distance from the MF to different landmarks did not show any side differences except the one to the symphysis menti (P<0.05; Mann-Whitney ?U? test). Similarly the distances from the nerve to the borders also did not show any significant side differences. These data indicate that, on average, MF is located at a symmetrical point on the ramus on either side, although, not exactly at a fixed distance from any landmarks tested. Further, the canals were located either at near to the middle or below near to the base of the mandible. This study concludes that, the location of the MF varies from bone to bone despite its bilateral symmetry. Further, the canal and consequently the nerve do not maintain a constant position in the mandible.

Narayana K; Vasudha S

2004-01-01

140

Response of molars and non-molars to a strict supragingival control in periodontal patients  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english The posterior position in the arches is one of the factors that underlies the poor prognosis of molar teeth (M). It is speculated that M do not benefit from the oral hygiene routine as well as non-molars (NM) do. This study evaluated the response of M and NM to supragingival control during a 6-month period in 25 smokers (S) and 25 never-smokers (NS) with moderate-to-severe periodontitis. One calibrated examiner assessed visible plaque (VPI) and gingival bleeding (GBI) ind (more) exes, periodontal probing depth (PPD), bleeding on probing (BOP), and clinical attachment loss (CAL) at days 0 (baseline), 30 and 180. At baseline, M showed significantly higher mean values of VPI (p = 0.017) and PPD (p

Angst, Patrícia Daniela Melchiors; Piccinin, Flávia Benetti; Oppermann, Rui Vicente; Marcantonio, Rosemary Adriana Chiérici; Gomes, Sabrina Carvalho

2013-02-01

 
 
 
 
141

Profile changes in premolar extraction/ Alterações no perfil em extrações de pré-molares  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Este estudo retrospectivo avaliou pacientes tratados com exodontias de pré-molares através da análise de telerradiografias, comparando o efeito de diferentes protocolos de exodontias no perfil. METODOLOGIA: 87 pacientes foram selecionados da clínica particular de três ortodontistas diplomados pelo Board Brasileiro de Ortodontia e Ortopedia Facial. Estes pacientes foram tratados com aparelho fixo Edgewise e foram divididos em três grupos, de acordo com a se (more) quência de pré-molares extraídos: "Grupo 40", primeiros pré-molares superiores (22 pacientes); "Grupo 44", quatro primeiros pré-molares (43 pacientes); e "Grupo 45", primeiros pré-molares superiores e segundos inferiores (22 pacientes). O Ângulo Z e a Linha de Burstone foram utilizados para quantificar e comparar os perfis antes e após o tratamento. RESULTADOS: O teste t-student mostrou melhora no perfil em todos os grupos, visto que o valor do ângulo Z apresentou-se maior ao final do tratamento e as medidas dos lábios vieram ao encontro dos valores preconizados por Burstone. A análise das mudanças proporcionadas pelo tratamento pela ANOVA não revelou diferenças significativas entre os grupos CONCLUSÃO: Os protocolos produzem aparências faciais semelhantes ao final do tratamento. Abstract in english PURPOSE: This retrospective study assessed patients treated with extraction of premolars by analysis of lateral cephalograms, comparing the effect of different tooth extraction protocols on the profile. METHODS: Eighty-seven patients were selected from the private practices of three orthodontists certified by the Brazilian Board of Orthodontics and Facial Orthopedics. These patients were treated with fixed edgewise appliances and divided into three groups according to the (more) sequence in which premolars were extracted: "Group 40", maxillary first premolars (22 patients); "Group 44", both maxillary and mandibular first premolars (43 patients); and "Group 45", maxillary first and mandibular second premolars (22 patients). The Z angle and the Burstone line were used to quantify and compare the profiles before and after treatment. RESULTS: Student's t-test showed profile improvement in all groups, as the Z angle value was higher at treatment completion and the lip measurements were in agreement with the values recommended by Burstone. Analysis of treatment changes by the ANOVA did not reveal significant differences between groups. CONCLUSION: The protocols produced similar facial appearance at treatment completion.

Allgayer, Susiane; Lima, Eduardo M. Santayana de; Rizzatto, Susana Deon; Tavares, Carlos Alberto Estevanell; Menezes, Luciane Macedo de; Mezzomo, Mauricio Barbieri

2011-01-01

142

Shear bond strength evaluation of bonded molar tubes on fluorotic molars.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To study the shear bond strength (SBS), sites of failure, and micromorphology of bonded molar tubes used on teeth affected by dental fluorosis. MATERIALS AND METHODS: This in vitro study included 140 first molars classified according to Dean's index for dental fluorosis. Samples were divided into seven groups: (1) healthy teeth etched for 15 seconds, (2) teeth with moderate fluorosis (MOF) etched for 15 seconds, (3) teeth with MOF etched for 150 seconds, (4) teeth with MOF microabrasion etched for 15 seconds, (5) teeth with severe fluorosis (SEF) etched for 15 seconds, (6) teeth with SEF etched for 150 seconds, and (7) teeth with SEF microabrasion etched for 15 seconds. All samples were incubated and were then submitted to the SBS test and evaluated with the modified adhesive remnant index (ARI) and analyzed by using a scanning electronic microscope. RESULTS: The SBS mean value for healthy enamel was 20 ± 10.2 MPa. For the group with MOF, the etched 150-second mean value was the highest (19 ± 7.6 MPa); for the group with SEF treated with microabrasion and etched for 15 seconds, the mean value was (13 ± 4.1 MPa). Significant differences (P ? .05) were found in the ARI between healthy and fluorosed groups. CONCLUSIONS: Fluorotic enamel affects the adhesion of bonded molar tubes. The use of overetching in cases of MOF and the combination of microabrasion and etching in SEF provides a suitable adhesion for fixed appliance therapy.

Silva-Benítez EL; Zavala-Alonso V; Martinez-Castanon GA; Loyola-Rodriguez JP; Patiño-Marin N; Ortega-Pedrajo I; García-Godoy F

2013-01-01

143

Diagnostic value of lectins in differentiation of molar placentas.  

UK PubMed Central (United Kingdom)

OBJECTIVES: Distinction of hydatidiform moles from non-molar specimens and subclassification of hydatidiform moles as complete and partial are important for clinical practice, but diagnosis based solely on histomorphology suffers from poor interobserver reproducibility. Nowadays, pathologists rely on molecular techniques, however these methods are technically difficult, relatively expensive, and time consuming, and cannot be applied in all laboratories. Therefore, a relatively easy, time- and cost-effective ancillary tool, would be helpful. This study aimed to assess the role of lectins in differential diagnosis of molar placentas. MATERIALS AND METHODS: Lectin histochemistry with a panel of HRP-conjugated lectins comprising SBA, DBA, MPA, PNA, VVA, UEA-1, LTA, GS-? (B4), and WGA were performed in 20 non-molar (hydropic and non-hydropic spontaneous abortions) and 20 molar (partial and complete moles), formalin-fixed paraffin-embedded tissue samples. On the basis of staining intensity, sections were graded and Kruskal-Wallis non-parametric statistical test was used to compare differences between samples. RESULTS: There was a significant difference between the reactivities of LTA and UEA-? with syncytiotrophoblasts of molar and non-molar specimens (P<0.001). These lectins generally showed a moderate reactivity with syncytiotrophoblasts of molar group but did not react with this cell population in non-molar group. Furthermore, WGA showed relatively increased reaction with syncytiotrophoblasts of molar tissues compared with abortions, however, this did not reach to statistical significance (P=0.07). No major differences were seen in other lectins reactivities between the studied groups. CONCLUSION: The present study showed that UEA-1 and LTA lectins may be used as cytochemical probes in differentiating molar from non-molar placentas, but did not differentiate partial moles from complete moles.

Atabaki Pasdar F; Khooei A; Fazel A; Mahmoudi M; Nikravesh MR; Khaje Delui M

2012-11-01

144

EMBARAZO ECTÓPICO MOLAR CORNUAL: CASO CLÍNICO  

Directory of Open Access Journals (Sweden)

Full Text Available Antecedentes: La incidencia de embarazo ectópico es 20/1000 embarazos y en la región cornual se presentan en el 2-4%. La mola hidatiforme ocurre en 1/1000 embarazos en EEUU y 1/500 en México. La presentación simultánea es muy rara. Se han descrito solamente 40 casos en la literatura médica, con una incidencia estimada de 0,04% de localización cornual. Caso clínico: Primigesta de 30 años, que cursando un embarazo de 8 semanas, acude de urgencia por presentar náuseas y vómitos de 1 día de evolución, con dolor abdominal y sangrado vaginal. Prueba de embarazo positiva. A la exploración física presenta dolor abdominal difuso y signos de irritación peritoneal. El ultrasonido transvaginal mostró imagen ecogénica multiquística intrauterina cercana a la región cornual, por lo que se sospecha embarazo molar. En la laparotomía exploradora se realizó resección cornual y posteriormente dilatación y curetaje de la cavidad uterina. La anatomía patológica confrmó el diagnóstico. Negativizó ß-hGC a las 7 semanas después de la cirugía.Background: The incidence of ectopic pregnancy is 20 per 1,000 pregnancies. The cornual ectopic pregnancy is found in 2-4%. Hydatidiform moles occur in 1 per 1000 pregnancies in USA and 1 per 500 in Mexico. Thus, the incidence of the two occurring together is very rare. Only 40 cases have been reported in the medical literature, the incidence estimate is 0.04%. Clinic case: We analyzed a 30 year old woman patient case, gravida 1, with 8 weeks’ gestation by last menstrual period, came at the Hospital Universitario “Dr. José Eleuterio González”, Monterrey, Nuevo León, with complaints of nausea and vomiting for 1 day and abdominal pain, and transvaginal bleeding. A cualitative pregnancy test was positive. Physical examination revealed diffuse abdominal tenderness and peritoneal signs. The transvaginal ultrasonography showed a multicystic echogenic mass within the uterus near cornual region consistent with a molar pregnancy. A cornual resection was performed followed by dilation and curettage. Pathologic diagnosis was confrmed. The monitoring of ß-hGC titers was negative 7 weeks after surgery.

Clara del Carmen Flores Acosta; Oralia Barboza Quintana; Oscar Vidal Gutiérrez; Felipe Morales Martínez

2010-01-01

145

Reliability of CBCT and other radiographic methods in preoperative evaluation of lower third molars.  

UK PubMed Central (United Kingdom)

OBJECTIVES: The aim of this study was to compare the reliability of cone-beam computerized tomography (CBCT) with that of other radiographic methods in preoperative radiographic determination of the number of roots of lower third molars and their relationship to the inferior alveolar canal (IAC). STUDY DESIGN: Forty-two teeth were clinically studied and imaged using CBCT and other imaging methods-panoramic radiography, multiprojection narrow-beam radiography (MNBR), and cross-sectional tomography. Statistical analysis (kappa values) was used to compare the diagnoses of 2 trained oral radiologists and the radiologic diagnoses with the findings at operation. RESULTS: Cone-beam CT revealed the number of roots of teeth more reliably than panoramic radiographs. CBCT examination was highly reliable in locating the IAC, whereas MNBR was unreliable and cross-sectional tomography fell between the two. With cross-sectional tomography, the IAC was noninterpretable in one-third of the cases. CONCLUSIONS: We recommend CBCT examination for preoperative radiographic evaluation of complicated impacted lower third molars.

Suomalainen A; Ventä I; Mattila M; Turtola L; Vehmas T; Peltola JS

2010-02-01

146

Inferior turbinate reduction surgery in children.  

UK PubMed Central (United Kingdom)

We assessed the effectiveness and safety of surgical reduction of the inferior turbinate in 64 children, ages three to 15 years, who were operated on between January 1985 and November 1995. All patients/parents were interviewed and assessed by means of a questionnaire one to 10 years postoperatively. All patients had follow-up and were evaluated clinically at one and two weeks postoperatively. Long-term follow-up visits occurred at six, 12 and 24 months. Eighty-nine percent of the children/parents reported a sustained improvement in their nasal airways. No cases of serious postoperative hemorrhage, excessive dryness nor long-term crusting of the nose were observed or reported. We conclude that in the treatment of children with severe nasal obstruction, surgical reduction of the inferior turbinate is a safe and effective operation, alone or in combination with other airway procedures, and may increase the effectiveness of subsequent medical management.

Weider DJ; Sulzner SE

1998-04-01

147

Inferior turbinate reduction surgery in children.  

Science.gov (United States)

We assessed the effectiveness and safety of surgical reduction of the inferior turbinate in 64 children, ages three to 15 years, who were operated on between January 1985 and November 1995. All patients/parents were interviewed and assessed by means of a questionnaire one to 10 years postoperatively. All patients had follow-up and were evaluated clinically at one and two weeks postoperatively. Long-term follow-up visits occurred at six, 12 and 24 months. Eighty-nine percent of the children/parents reported a sustained improvement in their nasal airways. No cases of serious postoperative hemorrhage, excessive dryness nor long-term crusting of the nose were observed or reported. We conclude that in the treatment of children with severe nasal obstruction, surgical reduction of the inferior turbinate is a safe and effective operation, alone or in combination with other airway procedures, and may increase the effectiveness of subsequent medical management. PMID:9581398

Weider, D J; Sulzner, S E

1998-04-01

148

Method of phlebography of inferior limbs  

International Nuclear Information System (INIS)

To increase diagnostics accuracy of damage communicant and deep veins of foot, a method of phlebography of inferior limbs is suggested, when contrast agent is introduced to hypodermic pelmatic interbulbar vein. The method suggested provides the image of not only deep veins of crus, thigh and related to them insufficient communicant veins, but the images of deep veins of foot with revealing its communicant vein insufficiency

1984-01-01

149

Parálisis traumática del recto inferior Traumatic paralysis of the inferior rectus muscle  

Directory of Open Access Journals (Sweden)

Full Text Available La parálisis constituye una interrupción completa de la acción muscular por afectación de la inervación responsable de la motilidad, a diferencia de la paresia, en la cual la afectación es parcial. La parálisis aislada del músculo recto inferior es clínicamente infrecuente caracterizada por hipertropía del ojo afectado que se acentúa a la abducción.El paciente presenta diplopía vertical que aumenta con la mirada hacia abajo sobre todo abajo y afuera, puede presentar tortícolis, lo que hace que se deprima el mentón. Es una entidad que no debemos olvidar en los traumatismo que afecten el piso de la órbita. Acude a consulta por presentar diplopía vertical de 7 meses de evolución. Al examen de motilidad ocular había una hipertropía de 15° x Hirshberg; 30 Dp base inferior por barra de prismas y marcada tortícolis con limitación en la depresión. El Test de fuerza generada mostró una ausencia de fuerza. Nuestra impresión diagnóstica fue parálisis traumática del músculo recto inferior derecho, por lesión directa. El tratamiento realizado fue la transposición total de los músculos rectos medial y recto lateral al músculo recto inferior derecho siguiendo la espiral de Tillaux horizontales con el objetivo de lograr el alineamiento de los ojos y eliminar la posición anómala de la cabeza, para lo cual se tiene en cuenta que la parálisis prolongada del recto inferior puede provocar contractura del recto superior ipsilateral, aspecto este que limita la depresión no solo en abducción sino también en aducción.Paralysis represents a complete interruption of muscular action due to problems in enervation in charge of motility, unlike paresia in which the effect is partial. The isolated inferior rectus muscle paralysis is infrequent and is characterized by the affected eye hypertropia that increases in abduction. The patient presents vertical diplopia that increases when he looks down and out, he can also suffer torticollis which depresses his chin. This is a disease that must not be ignored in patients with orbit floor traumatism. A patient went to see the doctor with vertical diplopia for 7 months. The ocular motility exam disclosed 15 ° × Hirshberg hypertrophy, 30 Dp inferior base by prism bar and marked torticollis with restricted depression. The definitive diagnosis was a traumatic paralysis of the right inferior rectus muscle due to a direct lesion. The treatment was total transposition of the medial and lateral rectus muscle to the right inferior rectus muscle following the Tillaux horizontal spiral, with the objective of reaching the eye's alignment and eliminating the anomalous position of the head. One kept in mind that the prolonged paralysis of the inferior rectus muscle may provoke contracture of the ipsilateral upper rectus, thus limiting the depression on abduction and adduction.

Rosa Naranjo Fernández; Yaimir Estévez Miranda; Teresita de Jesús Méndez Sánchez; Alina Pedroso Llanes

2010-01-01

150

[Inferior petrosal sinus catheterization: technical aspects].  

UK PubMed Central (United Kingdom)

PURPOSE: Inferior petrosal sinus catheterization and sampling for corticotropin dosage helps to differentiate hypophisary and ectopic forms of Cushing syndrome. The aim of this paper is to describe the technique used in inferior petrosal sinus catheterization in our service, emphasizing the solution found for frequent difficulties, and verify the success rate achieved. PATIENTS AND METHODS: Between September/2000 and September/2005, forty-two (eighty-four sinuses) patients were submitted to inferior petrosal sinus sampling. The difficulties for correct catheter positioning were identified and correlated with their solutions. RESULTS: Anatomical variations, similarity between IPS and emissary vein of the basilar plexus and unfavorable flow to the contrastation of the structures (retrograde catheterization) were the main problems. Using pre-shaped catheters, curved, steerable guide-wires, road-mapping and venography by contalateral injection, besides criteria to differentiate IPS from the emissary vein. Of the 84 sinuses approached, one was thrombosed, and 80 (96.4%) of 83 possible were selectively catheterized. No clinical complication occurred. CONCLUSION: IPSC can be safe and successfully performed in most cases. The identification of the emissary vein of the basilar plexus and use of venography by contralateral injection, improved the method performance.

Puglia Jr P; Caldas JG; Barbosa LA; Sá Jr AT; Machado MC; Salgado LR

2008-06-01

151

Endoscopic inferior turbinate reduction: an outcomes analysis.  

UK PubMed Central (United Kingdom)

OBJECTIVES/HYPOTHESIS: In a previous publication, we introduced an endoscopic technique for the treatment of nasal obstruction caused by inferior turbinate hypertrophy. The technique, a modification of the procedure popularized by Mabry, involves resecting the inferior and lateral aspects of the inferior turbinate with a microdebrider under endoscopic guidance. Our preliminary postoperative results were favorable. All 20 patients experienced improvement by postoperative day 5 and the incidence of complications over the first 6 months after surgery was low. The objective of this study is to perform a long-term outcomes analysis of patients undergoing the procedure. STUDY DESIGN: Follow-up survey questionnaire and analysis. METHODS: We sent questionnaires to 60 patients, ranging from 6 to 40 months after surgery, inquiring about continued use of nasal medications, need for further surgery, presence of adverse effects, and improvement in symptoms. Nasal airway obstruction was assessed on a subjective scoring scale from 1 (no obstruction) to 6 (complete obstruction). RESULTS: Of the 28 (47%) patients who returned questionnaires, the severity of daytime nasal obstruction was rated as 2.3 and nighttime nasal obstruction as 2.7. The use of nasal steroids and oral decongestants was 25% and 21%, respectively. Adverse effects were minimal and all but one patient (96%) experienced improvement in their nasal airway. CONCLUSION: These results confirm the long-term effectiveness of this procedure for the relief of nasal obstruction.

Gupta A; Mercurio E; Bielamowicz S

2001-11-01

152

Powered Submucous Resection of the Inferior Turbinate  

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Full Text Available Objectives: The objectivesof the present our experience with endoscopic powered modification of the submucous resection in inferior turbinate hypertrophy and to underline the morphological and functional results of the treatment.Patients and Methods: Sixty-five patients with inferior turbinate hypertrophy were treated by bilateral turbinoplasty with microdebriders for a period of 2 years. All patients underwent nasal endoscopy, Cottle's test, visual analogue (VAS) scale assessment and objective functional evaluation of nasal patency by acoustic rhinometry and rhinomanometry before and after decongestion before the operation. The patients were followed up to 1 year postoperatively.Results: VAS showed marked improvement in nasal breathing – increased by 2.12 points (60%). Total Minimal Crossectional Area (TMCA) –increased by 0.42 cm2 (36%) and the Total Nasal Volume (TNV) increased by 3.82 cm3 (32%). The Total Nasal Resistance (TNR) – decreased by 0.34 Pa/cm3/sec (47%). All postoperative data for the functional assessment of the nasal breathing were collected without decongestion.Conclusion: Powered submucous turbinoplasty with microdebriders allows precisely controlled resection of submucosa and bone with mucosal preservation, making this technique, the method of choice enabling optimal volume reduction with preservation of function of the inferior turbinate.

Rumen BENCHEV

2006-01-01

153

Evaluation in vitro of pulpal chamber temperature of deciduous teeth during Er:YAG laser application; Avaliacao in vitro da temperatura na camara pulpar de dentes deciduos durante aplicacao do laser de Er:YAG  

Energy Technology Data Exchange (ETDEWEB)

The Er:YAG laser technology has been thoroughly studied, since its invention, and has been increasingly recommended in Dentistry. However, its use in deciduous teeth has not been deserving the equivalent attention to its counterpart in permanent teeth, despite of the deciduous teething occur in a phase of life in which it has a far more importance than its substitutes. For that reason, this study aims to identify the suitable parameters to the clinic procedures in deciduous teeth, using the already established protocols in permanent teeth. The study was lead in a way to resemble the most the conditions of the clinical use of the laser. Five groups were analyzed using different energy densities and repetition rates. Each group was composed of 10 first superior right deciduous molars randomly selected. The energy densities and repetition rates used for each group were: 60 mJ 15 Hz, 250 mJ 2 Hz, 250 mJ 15 Hz, 400 mJ 6 Hz and 500 mJ 2 Hz. The results obtained allowed us to conclude that the use of the Er:YAG laser in Odontopediatrics is effective, safe and secure and the main reason for its recommendation is the low transfer of heat to the adjacent tissues of the applied surfaces. (author)

Sznajder, Alexandre Joseph

2001-07-01

154

Simultaneous confidence intervals on multivariate non-inferiority.  

UK PubMed Central (United Kingdom)

We discuss the analysis of non-inferiority trials based on a multi-armed design with multiple correlated endpoints. We consider five different scenarios: (1) global non-inferiority; (2) non-inferiority for subsets of comparisons; (3) global non-inferiority for a treatment group; (4) global non-inferiority for an endpoint; and (5) local non-inferiority. We describe and compare related approaches, which are based on the union-intersection and intersection-union test principles - alone and in combination. Because non-inferiority thresholds for many differently scaled endpoints are rarely available in practice, the approaches described focus on the estimation of simultaneous confidence limits and their post hoc interpretation on non-inferiority. We discuss and demonstrate pros and cons by means of a real data example.

Hasler M; Hothorn LA

2013-05-01

155

Extração de incisivo inferior: uma opção de tratamento ortodôntico Lower incisor extraction: an orthodontic treatment option  

Directory of Open Access Journals (Sweden)

Full Text Available A exodontia de um incisivo inferior pode ser considerada uma opção valiosa na busca de excelência nos resultados ortodônticos para obtenção de máxima função, estética e estabilidade. O objetivo deste estudo foi reunir informações referentes às indicações, contraindicações, vantagens, desvantagens e estabilidade dos resultados obtidos nos tratamentos realizados com extração de um incisivo inferior. Essa opção de tratamento pode ser indicada em más oclusões com discrepância de volume dentário anterior devido a incisivos superiores estreitos e/ou incisivos inferiores largos. É contraindicada em más oclusões sem discrepância anterior ou com discrepâncias ocasionadas por incisivos superiores largos e/ou incisivos inferiores estreitos. A literatura sugere maior estabilidade pós-tratamento quando comparada com a opção de extrações de pré-molares. Além do diagnóstico cuidadoso, obtido com a colaboração do set-up, a habilidade e a experiência clínica do profissional são importantes para o sucesso dos resultados ortodônticos alcançados com essa opção de tratamentoLower incisor extraction can be regarded as a valuable option in the pursuit of excellence in orthodontic results in terms of function, aesthetics and stability. The aim of this study was to gather information about the indications, contraindications, advantages, disadvantages and stability of the results achieved in treatments performed with lower incisor extraction. This treatment option may be indicated in malocclusions with anterior dental volume discrepancy due to narrow maxillary incisors and/or large mandibular incisors. It is contraindicated in malocclusions without anterior discrepancy or with discrepancies caused by large maxillary incisors and/or narrow mandibular incisors. The literature suggests this method affords improved posttreatment stability compared with premolar extraction. As well as a careful diagnosis, established with the aid of a diagnostic setup, professional skills and clinical experience are instrumental in achieving successful orthodontic results with this treatment option

Mírian Aiko Nakane Matsumoto; Fábio Lourenço Romano; José Tarcísio Lima Ferreira; Silvia Tanaka; Elizabeth Norie Morizono

2010-01-01

156

Pulpotomies with portland cement in human primary molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english Two clinical cases in which Portland cement (PC) was applied as a medicament after pulpotomy of mandibular primary molars in children are presented. Pulpotomy using PC was carried out in two mandibular first molars and one mandibular second molar, which were further followed-up. At the 3, 6 and 12-month follow-up appointments, clinical and radiographic examinations of the pulpotomized teeth and their periradicular area revealed that the treatments were successful in maint (more) aining the teeth asymptomatic and preserving pulpal vitality. Additionally, the formation of a dentin bridge immediately below the PC could be observed in the three molars treated. PC may be considered as an effective alternative for primary molar pulpotomies, at least in a short-term period. Randomized clinical trials with human teeth are required in order to determine the suitability of PC before unlimited clinical use can be recommended.

Conti, Taísa Regina; Sakai, Vivien Thiemy; Fornetti, Ana Paula Camolese; Moretti, Ana Beatriz Silveira; Oliveira, Thais Marchini; Lourenço Neto, Natalino; Machado, Maria Aparecida Andrade Moreira; Abdo, Ruy Cesar Camargo

2009-02-01

157

Remoción de terceros molares mandibulares con asistencia endoscópica: Nota técnica de un nuevo procedimiento quirúrgico para prevenir lesiones del NAI y formación de defectos óseos/ Removal of mandibular third molars with endoscopic approach: Technical note of a new surgical procedure to avoid IAN damage and bone defect formation  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish La variada posición anatómica de los terceros molares mandibulares presenta importantes desafíos asociados a su profundidad y grado de inclinación. Las complicaciones más habituales del procedimiento quirúrgico convencional de extracción se relacionan con la extensa osteotomía y poca visualización del sitio quirúrgico, que pueden generar consecuencias post-quirúrgicas como inflamación, dolor, trismus, lesiones reversibles e irreversibles del nervio alveolar in (more) ferior (NAI) o nervio lingual, riesgo de fractura y formación de defectos periodontales del segundo molar. La implementación de soportes rígidos en la óptica endoscópica ha permitido utilizar esta tecnología para realizar abordajes mínimamente invasivos para remover terceros molares mediante accesos flapless con una mínima osteotomía de la zona oclusal, conservando la pared bucal y lingual a través de la visualización directa y magnificada del sitio quirúrgico, adaptable a los movimientos del paciente durante la intervención. En este reporte se presenta un nuevo procedimiento quirúrgico mínimamente invasivo a través de asistencia endoscópica para la conservación ósea en la remoción de terceros molares mandibulares con riesgo de lesión del nervio alveolar inferior. Abstract in english Anatomic variability of the position of mandibular third molars represents significant challenges associated with its depth and angulation. The most common complications of conventional surgical procedure are related to extensive osteotomy and poor visualization, which can cause postsurgical effects such as inflammation, pain, trismus, reversible and irreversible lesions of the inferior alveolar nerve (IAN) or lingual nerve, fracture risk and formation of a deep periodont (more) al defect on the distal aspect of the second molar. The implementation of rigid endoscopy in optics has allowed to use this technology via a minimally invasive approach to remove third molars by a minimally occlusal flapless ostectomy, preserving the buccal and lingual walls through direct and magnified visualization of the surgical site, adaptable to the patient’s movements during the surgery. In this report, we present a new and minimally invasive procedure through endoscopic assistance for bone conservation in the removal of third molars at risk of inferior alveolar nerve injury.

Fuentes, R; Beltrán, V; Cantín, M; Engelke, W

2012-08-01

158

Leiomiossarcoma de veia cava inferior/ Leiomyosarcoma of the inferior vena cava  

Scientific Electronic Library Online (English)

Full Text Available Abstract in english We present a case of a 56-year-old woman with abdominal pain, normal laboratorial exams, normal carcinoembryonary antigen (CEA) and abdominal tomography exam with tumor formation in hepatic region. A tumor lesion was identified in a surgery in the medial segment of the inferior vena cava. A surgical resection was done, respecting the security limits, and reconstruction of the inferior vein with polytetrafluoroethylene (PTFE) graft was performed. The histological examinati (more) on showed differentiated leiomyossarcoma of the inferior vena cava. This report points to the necessity of differential diagnoses with leiomyossarcoma in the presence of abdominal mass, supra-mesocolic, and non-specific abdominal symptoms, since its pre-surgical diagnoses occurs in only 5% to 10% of the cases.

Larangeira, Lino Luis Sanches; Nabut, Naja; Guembarovski, Alda L.

2006-04-01

159

Infiltration anesthesia for extraction of the mandibular molars.  

UK PubMed Central (United Kingdom)

PURPOSE: Profound anesthesia for mandibular molars by buccal infiltration has been tried in recent years, with promising results. This prospective, randomized, single-blinded, crossover study investigated the clinical anesthetic efficacy obtained with 1:100,000 epinephrine plus 4% articaine (A100) 1.8 versus 3.6 mL as mandibular first molar buccal infiltration during removal of impacted lower third molars. MATERIALS AND METHODS: Thirty adult patients underwent removal of symmetrically positioned impacted lower third molars in 2 separate appointments. The patients randomly received mandibular buccal first molar infiltration of A100 1.8 or 3.6 mL during surgery. For assessment of anesthetic efficacy, any pain during surgery was rated using the visual analog scale. Also, the onset, duration, and total amount of anesthetic used were recorded. RESULTS: Compared with the 1.8-mL volume of A100, the 3.6-mL volume showed a statistically higher success rate (93% vs 56%). CONCLUSIONS: Infiltration in the buccal vestibule opposite the mandibular first molar by A100 3.6 mL may be a good option for extraction of mandibular third molars, with supplemental lingual anesthesia.

El-Kholey KE

2013-10-01

160

Mandibular first molar relation to variable lower face skeletal components.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To evaluate the position of the mandibular first permanent molar in the mandible relative to several factors. MATERIALS AND METHODS: A total of 185 untreated Class I and Class II patients were randomly selected from a sample of 350 patients from a single office. The palatal and mandibular planes were related to Frankfort horizontal to create the interjaw or "B" angle. Age and the mesial contact of the mandibular first molars were used. The landmarks were projected at right angles to the Frankfort horizontal for effective mandibular dimension lengths. Actual-length dimensions were projected at right angles to the mandibular plane. Pearson product moment correlation coefficients were computed to evaluate the effect of age, cranial length, and mandibular contribution to the molar's sagittal position in the mandible. Significance was reported only when P < .05 to determine a 95% confidence level. RESULTS: Statistically significant positive correlations indicated that the mandibular molar is located more forward with increasing age, longer mandibular body length, and increasing posterior facial height. In contrast, significant negative correlations to the interjaw, mandibular plane, ramal inclination angles, and the linear ramal contribution corresponded to a more posterior position of the molar with increasing angles. CONCLUSIONS: The mandibular first permanent molar is located more anteriorly with an older patient, a longer mandibular body, greater posterior facial height, and an acute interjaw angle. In contrast, an increase in the forward tip of the ramus places the molar in a more posterior location.

Andria LM; Leite LP; Dunlap AM; Cooper EC; King LB

2007-01-01

 
 
 
 
161

Uprighting of severely impacted mandibular second molars: a case report.  

UK PubMed Central (United Kingdom)

INTRODUCTION: The incidence of mandibular first and second molar impaction is increasing but still recorded as rare. Treatment methods involving uprighting, extraction, or autologous tooth transplantation have been described. AIM: The present study describes the uprighting of 3 impacted mandibular second molars presenting with eruptive disorders. METHODS: The application of limited and appropriate orthodontic therapy completed treatment in 11 months, 5 months, and 2 years and 3 months, respectively. Although no absolute anchorage in the form of miniscrews was required, no significant anchorage demands were considered necessary. Although the third molar tooth germs were identified and preserved in each case, no adverse influence on the uprighting of the second molars was encountered. RESULTS: The favourable molar repositioning results were likely due to the youth of the 3 patients as the third molars were in early development and bone remodelling was marked. Furthermore, no problems related to anchorage or alveolar bone loss were identified after treatment. CONCLUSION: The results indicated the benefits of limited orthodontic treatment and early intervention for the uprighting of impacted mandibular second molars.

Fujita T; Shirakura M; Hayashi H; Tsuka Y; Fujii E; Tanne K

2012-11-01

162

Are referred inaccessible human primary molar teeth really inaccessible?  

Science.gov (United States)

Despite a body of compelling evidence pertaining to the root canal accessibility of primary teeth, the number of referrals for inaccessibility of primary molars is considerable. The aim of the present study was to evaluate the prevalence of true and false primary molar inaccessibility among subjects who had been referred by general and pediatric dentists. We examined 199 primary molars in 156 patients (87 males, 69 females) aged 3-7 years who were referred by 215 general and 35 pediatric dentists. Problems related to inaccessibility were recorded for each tooth and any individual canal. One hundred seventy-five inaccessible teeth (87.9%) were successfully rehabilitated to accessible status (P < 0.001). The most frequent cause of inaccessibility was an inappropriate access cavity (42.3%), followed by difficult canals (32.6%) and orifice calcification (25.2%). The tooth most frequently reported as inaccessible was the maxillary first molar (40.2%), and that least frequently reported was the mandibular second molar (11.6%). The distobuccal canal of the maxillary first molar and the mesiolingual canal of the mandibular first molar were the most commonly inaccessible canals (P < 0.001). Only 1 out of 8 teeth referred as inaccessible was truly inaccessible. It seems that root canal inaccessibility is mostly attributable to lack of expertise among individual practitioners. PMID:23748457

Asl Aminabadi, Naser; Sighari Deljavan, Alireza; Samiei, Mohammad; Jamali, Zahra

2013-01-01

163

Are referred inaccessible human primary molar teeth really inaccessible?  

UK PubMed Central (United Kingdom)

Despite a body of compelling evidence pertaining to the root canal accessibility of primary teeth, the number of referrals for inaccessibility of primary molars is considerable. The aim of the present study was to evaluate the prevalence of true and false primary molar inaccessibility among subjects who had been referred by general and pediatric dentists. We examined 199 primary molars in 156 patients (87 males, 69 females) aged 3-7 years who were referred by 215 general and 35 pediatric dentists. Problems related to inaccessibility were recorded for each tooth and any individual canal. One hundred seventy-five inaccessible teeth (87.9%) were successfully rehabilitated to accessible status (P < 0.001). The most frequent cause of inaccessibility was an inappropriate access cavity (42.3%), followed by difficult canals (32.6%) and orifice calcification (25.2%). The tooth most frequently reported as inaccessible was the maxillary first molar (40.2%), and that least frequently reported was the mandibular second molar (11.6%). The distobuccal canal of the maxillary first molar and the mesiolingual canal of the mandibular first molar were the most commonly inaccessible canals (P < 0.001). Only 1 out of 8 teeth referred as inaccessible was truly inaccessible. It seems that root canal inaccessibility is mostly attributable to lack of expertise among individual practitioners.

Asl Aminabadi N; Sighari Deljavan A; Samiei M; Jamali Z

2013-01-01

164

Influence of cervical preflaring on determinationof apical file size in mandibular molars: SEM analysis  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Este estudo investigou a influência do alargamento cervical feito com diferentes instrumentos rotatórios na determinação do instrumento apical inicial (IAI) das raizes mésio-vestibulares de molares inferiores. Foram utilizados 50 molares inferiores cujas raízes mesiais apresentavam dois forames apicais nitidamente separados (mésio-vestibular e mésio-lingual). Após o acesso à câmara pulpar de forma convencional e remoção do tecido pulpar, o comprimento de trab (more) alho foi definido a 1 mm do ápice radicular. Os dentes foram divididos aleatoriamente em cinco grupos (n= 10) de acordo com o tipo de instrumento utilizado no alargamento cervical. No grupo 1, o IAI foi definido sem o prévio alargamento dos terços médio e cervical das raízes. Nos grupos 2 a 5, o terço cervical e médio do canal radicular foi alargado com as brocas de Gates-Glidden, instrumentos Pro Taper, Endo Flare e brocas LA Axxes, respectivamente. A determinação do IAI foi realizada manualmente com limas tipo K em ordem crescente de diâmetro a partir da lima 08 até se chegar ao instrumento que permitisse ao operador ter a sensação tátil do mesmo estar firmemente ajustado ao CRT. O instrumento que correspondeu ao IAI foi fixado no interior do canal radicular com cianocrilato de metila. Com o IAI posicionado, os dentes foram seccionados transversalmente até 1 mm do ápice. As seções transversais do CRT foram observadas através da microscopia eletrônica de varredura e os desajustes entre o diâmetro do canal e o diâmetro do IAI foram calculados com a função "régua" (FEG) do software do próprio microscópio. Os resultados foram avaliados estatisticamente pelo testes de Kruskal-Wallis e Dunn ao nível de significância de 5%. Houve diferenças estatisticamente significantes entre os grupos (p Abstract in english This study investigated the influence of cervical preflaring with different rotary instruments on determination of the initial apical file (IAF) in mesiobuccal roots of mandibular molars. Fifty human mandibular molars whose mesial roots presented two clearly separated apical foramens (mesiobuccal and mesiolingual) were used. After standard access opening and removal of pulp tissue, the working length (WL) was determined at 1 mm short of the root apex. Five groups (n=10) w (more) ere formed at random, according to the type of instrument used for cervical preflaring. In group 1, the size of the IAF was determined without preflaring of the cervical and middle root canal thirds. In groups 2 to 5, preflaring was performed with Gates-Glidden drills, ProTaper instruments, EndoFlare instruments and LA Axxes burs, respectively. Canals were sized manually with K-files, starting with size 08 K-files, inserted passively up to the WL. File sizes were increased until a binding sensation was felt at the WL and the size of the file was recorded. The instrument corresponding to the IAF was fixed into the canal at the WL with methylcyanoacrylate. The teeth were then sectioned transversally 1 mm short of the apex, with the IAF in position. Cross-sections of the WL region were examined under scanning electron microscopy and the discrepancies between canal diameter and the diameter of IAF were calculated using the tool "rule" (FEG) of the microscope's proprietary software. The measurements (µm) were analyzed statistically by Kruskal-Wallis and Dunn's tests at 5% significance level. There were statistically significant differences among the groups (p0.05) were found among the rotary instruments. In conclusion, cervical preflaring improved IAF fitting to the canals at the WL in mesiobuccal roots of maxillary first molars. The rotary instruments evaluated in this study did not differ from each other regarding the discrepancies produced between the IAF size and canal diameter at the WL.

Schmitz, Marcia da Silva; Santos, Roberto; Capelli, Alexandre; Jacobovitz, Marcos; Spanó, Júlio César Emboava; Pécora, Jesus Djalma

2008-01-01

165

Análise da presença do canal cavo-inter-radicular em molares: estudo in vitro = ‘In vitro’ analysis of acessory foramina in molar teeth  

Directory of Open Access Journals (Sweden)

Full Text Available Evidências significativas sugerem a inter-relação existente entre a região de furca de dentes multirradiculados com o desenvolvimento de lesões endo-periodontais, principalmente, quando da presença do canal cavo-inter-radicular. Com o objetivo de compreender os mecanismos envolvidos na etiopatogenia de tais doenças periodontais, assim como propiciar o diagnóstico e o tratamento precoces, buscou-se melhor caracterizar essa região dando ênfase à morfologia do assoalho da câmara pulpar. Para este estudo foram selecionados 42 molares humanos extraídos, sendo 21 superiores e 21 inferiores. Após realizadas as aberturas coronárias e localizadas as entradas dos canais radiculares, os dentes tiveram parte das porções coronária e radicular cortada perpendicularmente ao longo do seu eixo, com o auxílio de disco de carburundum. Depois de uma criteriosa limpeza dos espécimes, esses foram secos em câmara de ponto crítico, sendo, a seguir, preparados para análise em microscópio eletrônico de varredura (Philips®, modelo XL30, Holanda). Os dados foram analisados através do Teste U de Mann- Whitney e do teste Qui-quadrado. Com base nos resultados obtidos e de acordo com a literatura pertinente, pôde-se verificar que: 1. o diâmetro e o número de túbulos dentinários encontrados por mm2 assim como a presença de foraminas no assoalho da câmara pulpar sugerem a permeabilidade dessa região; 2. o diâmetro maior de algumas foraminas identifica a presença do canal cavo-inter-radicular. Mounting evidence has suggested a relationship between the existing furcation region in multirradicular teeth and the development of endoperiodontal lesions. This effect is particulary pronounced when accessory foramina are present. In order to improve our understanding of the mechanisms involved in the etiopathogeny of periodontal disease, as well as facilitate early diagnosis and treatment, an attempt was made to characterize this region with special attention to the morphology of the pulp chamber floor. Forty-two extracted human molars (21 maxillary and 21 mandibular molars) were used in this study. After the crows had been resected and the root canals openings identified, part of the coronal and radicular sections of the teeth were split longitudinally their axes with carborundum disc. After meticulous cleansing, the teeth were dried in a critical point dry chamber and then prepared for analysis in a Philips® XL-30, Holland, SEM. The collected data were submitted to statistical analysis by Mann-Whitney Test and Qui-square Test. The results obtained and a revision of literature shows that: 1. the number and diameter of dentinal tubules per mm2 found, as well as the presence of foramina on the pulp chamber floor are indicators of permeability in this region; 2. the wider diameter of some foramina indicate the presence of accessory foramina.

Cunha, Fernanda Silveira da; Machado, Geovana; Neuvald, Lilian Rosane

2005-01-01

166

Orthodontic uprighting of severely impacted mandibular second molars.  

UK PubMed Central (United Kingdom)

The prevalence of impacted second molars is low, varying from 0% to 2.3%. The etiology of an impaction can involve systemic, local, and periodontal factors, as well as a developmental disruption of the tooth germ. A number of surgical and orthodontic treatment options have been suggested in the literature, including leaving the tooth in situ, removing the impacted second molar, orthodontic uprighting, and autotransplantation. Removal of third molars has been suggested as an adjunct for space creation. This article presents the treatment of a girl with bilateral severely impacted mandibular second molars as well as an ectopic maxillary left canine and severe crowding affecting both the maxillary and mandibular arches. Her treatment was successfully completed with fixed preadjusted edgewise appliances (0.022 × 0.028-in slot size) and MBT prescription (APC precoated Gemini Brackets; 3M Unitek, St. Paul, Minn), along with the removal of 4 first premolars. The maxillary left canine and the mandibular second molars were surgically exposed. The treatment mechanics show that even severely impacted second molars can be uprighted by routine straight-wire techniques, which are easy to apply. The center of rotation of the second molar lies in the bifurcation of the roots of this tooth, and this biomechanical property was used to its full advantage. The techniques applied comprised bracket repositioning, bypass of brackets, conversion of molar tubes to brackets, thermoelastic copper-nickel-titanium archwires, and a push-coil spring. Other orthodontic treatment mechanics, which require complex sectional or segmental techniques, auxiliaries, or artistic wire bending, that have been suggested in the literature were not used here. The third molars were not removed.

Lau CK; Whang CZ; Bister D

2013-01-01

167

Excess molar volumes and excess molar enthalpies of quinoline + aromatic hydrocarbons at 303. 15 K  

Energy Technology Data Exchange (ETDEWEB)

Excess molar volumes V[sub m][sup E] and excess molar enthalpies H[sub m][sup E][sub m] for quinoline + benzene, toluene, o-xylene, or p-xylene for the whole range of compositions have been measured at 303.15 K. The values of H[sub m][sup E] and V[sub m][sup E] for these mixtures suggest that quinoline is partly self-associated and there is strong interaction (weak hydrogen bonding) between quinoline and aromatic hydrocarbons. The values of V[sub m][sup E] and H[sub m][sup E] have also been computed from the Flory and Abe theory and Sanchez and Lacombe theory as well as from the Graph theory. All the theories correctly predict the sign or magnitude of H[sub m][sup E]. Only the Graph theory is able to predict correctly the sign or magnitude of V[sub m][sup E]; the other theories give a poor estimate of V[sub m][sup E].

Kalra, K.C.; Singh, K.C.; Spah, D.C.; Batra, R.; Maken, S. (Maharshi Dayanand Univ., Rohtak (India). Dept. of Chemistry)

1993-01-01

168

The evidence for reducing inferior turbinates.  

UK PubMed Central (United Kingdom)

Nasal obstruction is commonly due to enlargement of the inferior turbinate. This review discusses the pathophysiology of turbinate enlargement, the indications for, and methods and outcome of turbinate reduction. All techniques are successful but vary in their long-term efficacy, their propensity for complications and the degree to which they may adversely affect nasal function. Newer techniques under local anaesthetic and often endoscopic control offer outpatient treatment with satisfactory outcomes. However selecting a particular technique should take account of the individual patient's features, the surgeon's experience and judgement and informed patient choice.

Willatt D

2009-09-01

169

The evidence for reducing inferior turbinates.  

Science.gov (United States)

Nasal obstruction is commonly due to enlargement of the inferior turbinate. This review discusses the pathophysiology of turbinate enlargement, the indications for, and methods and outcome of turbinate reduction. All techniques are successful but vary in their long-term efficacy, their propensity for complications and the degree to which they may adversely affect nasal function. Newer techniques under local anaesthetic and often endoscopic control offer outpatient treatment with satisfactory outcomes. However selecting a particular technique should take account of the individual patient's features, the surgeon's experience and judgement and informed patient choice. PMID:19839242

Willatt, David

2009-09-01

170

Inferior vena caval filters: noninvasive evaluation.  

UK PubMed Central (United Kingdom)

Transvenous inferior vena caval filters were placed in 32 patients (21 bird's nest [BN] and 11 Kimray-Greenfield [K-G] filters). Positive contrast cavography was performed before and immediately after filter placement as well as during long-term follow-up studies. In 23 patients, computed tomographic (CT) scanning was also performed; in 10 patients, real-time ultrasound (US) study was used as an adjunct. CT scans of the BN filter showed one case of hemorrhage and one case of air embolism, both of which were not recognized at cavography. CT scanning of the K-G filter demonstrated two cases of deep penetration of the prongs and one large retroperitoneal hematoma. Real-time US scanning played a major role in checking the final position of the filter and in determining its stability during repositioning of the upper prongs of one BN filter. Noninvasive examinations, including CT and US scanning, are valuable adjuncts in immediate and long-term follow-up study of patients with inferior vena caval filters.

Liu GC; Angtuaco TL; Ferris EJ; Shah HR; Reifsteck JE; Harshfield DL

1986-08-01

171

Inferior vena caval filters: noninvasive evaluation.  

Science.gov (United States)

Transvenous inferior vena caval filters were placed in 32 patients (21 bird's nest [BN] and 11 Kimray-Greenfield [K-G] filters). Positive contrast cavography was performed before and immediately after filter placement as well as during long-term follow-up studies. In 23 patients, computed tomographic (CT) scanning was also performed; in 10 patients, real-time ultrasound (US) study was used as an adjunct. CT scans of the BN filter showed one case of hemorrhage and one case of air embolism, both of which were not recognized at cavography. CT scanning of the K-G filter demonstrated two cases of deep penetration of the prongs and one large retroperitoneal hematoma. Real-time US scanning played a major role in checking the final position of the filter and in determining its stability during repositioning of the upper prongs of one BN filter. Noninvasive examinations, including CT and US scanning, are valuable adjuncts in immediate and long-term follow-up study of patients with inferior vena caval filters. PMID:3523595

Liu, G C; Angtuaco, T L; Ferris, E J; Shah, H R; Reifsteck, J E; Harshfield, D L

1986-08-01

172

Moraxella Catarrhalis en tracto respiratorio inferior  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Se analizaron 1598 muestras de tracto respiratorio inferior de pacientes admitidos en el Hospital San Juan de Dios, San José, Costa Rica de noviembre de 1996 a agosto de 1997 y se determinó una frecuencia de aislamiento de Moraxella catarrhalis de 4,3%. Los pacientes con enfermedad pulmonar obstructiva crónica (EPOC), tuvieron mayor riesgo de presentar la bacteria Moraxella catarrhalis (p(more) lla catarrhalis mostró un patrón de sensibilidad a los antimicrobianos mayor del 90% frente a amikacina, ampicilina, cefotaxima, cefalotina y cloranfenicol. Se determinó que Moraxella catarrhalis no es un agente primario de las infecciones del tracto respiratorio inferior; sin embargo, la historia clínica del paciente debe ser tomada en cuenta para sospechar la presencia de éste microorganismo y el subsecuente tratamiento. Abstract in english Among 1598 lower respiratory tract samples corresponding to patients admitted at the San Juan de Dios Hospital, San José, Costa Rica, between november 1996 and august 1997 (The frecuency of isolation of Moraxella catarrhalis) was 4,3%. Patients with Chronic Obstrutive Pulmonary Disease (copd) had a higher risk of presenting Moraxella catarrhalis (p(more) for all the strains of Moraxella catarrhalis that were obtained and they yielded ad more than 90% susceptibility to amikacin, ampicillin, cefotaxime, cephalothin and chloramphenicol . It was determined that Moraxella catarrhalis is not a primary lower respiratory tract infection agent, even though the clinical history of the patient must be considered as an important guide on the isolation of this microorganism and subsequent treatment.

Mora Mora, Minor

1998-12-01

173

Hepatocellular carcinomas supplied by inferior phrenic arteries  

International Nuclear Information System (INIS)

[en] Purpose: To assess the arterial supply to hepatocellular carcinomas (HCCs) by inferior phrenic arteries (IPA). Material and Methods: A total of 126 consecutive cases of HCC were studied by contrast-enhanced CT and conventional arteriography. Blood supply from an IPA was suspected when the size of the HCC mass as seen on contrast-enhanced CT did not match the size of the tumor mass as seen on hepatic arteriography. Inferior phrenic arteriography was employed to confirm these findings. HCCs fed by the IPA were analyzed in terms of size, location, and history of prior treatment. Results: In 14 (11%) of the 126 cases, the tumor was found to have a blood supply from an IPA. Eleven of these tumors were located in segments 2 and 7. Three tumors, which had not been treated previously, had a blood supply from an IPA. Six tumors were almost exclusively fed by an IPA and were located in segments 7, 1, and 4. Conclusion: HCCs located in segments which form the bare area of the liver (S1, S2, S7) can be supplied by an IPA. This should be suspected when a lesion or part of a lesion is identified on contrast-enhanced CT but not on hepatic arteriography. (orig.)

1998-01-01

174

Argon plasma coagulation for inferior turbinate reduction.  

Science.gov (United States)

Surgical reduction of the inferior turbinate remains a widely used therapy for nasal obstruction caused by hyperplastic turbinates. Current methods are costly and time-consuming, require nasal packing, and cause extended postoperative swelling. Argon plasma coagulation (APC) is a new, innovative technique in otorhinolaryngological surgery that is based on high-frequency electrical current. The current is transmitted through ionized argon gas (plasma) contact-free to the tissue surface and creates a coagulation and devitalization zone with limited penetration. Forty-five patients with nasal obstruction were treated under local anesthesia for reduction of the inferior turbinates with APC. Seventy-six percent of the patients reported an improvement of postoperative swelling within the first week. After 3 months, 86% reported having better nasal airflow than they had before the operation. Macroscopically, after 4 weeks the turbinate was covered by normal mucosa in 51% of the patients. Crust formation was minimal, and no bleeding occurred. Turbinate reduction with APC is an alternative technique with many advantages, and the results are comparable to those of standard techniques. Ninety-five percent of the patients were satisfied with the operation. PMID:11007087

Bergler, W; Riedel, F; Götte, K; Hörmann, K

2000-09-01

175

Radiofrequency treatment for inferior turbinate hypertrophy.  

Science.gov (United States)

Radiofrequency ablation (RFA) is a technique which causes a reduction in tissue amount using ablation by high-frequency current. Beside other surgical tools, RFA has become quite popular over the past decade. Hypertrophy of the inferior turbinate is a common cause of chronic nasal obstruction. There is no agreement on how to deal with this problem. An ideal procedure for turbinate reduction should be performed with minimal discomfort or adverse reactions and should preserve the physiologic function of the turbinate, such as regulation of humidification and temperature of inspired air. All the current techniques have potential short and long-term complications such as bleeding and atrophic rhinitis. No technique is perfect, and the main goal of turbinate surgery should be the preservation of mucosal surfaces with reduction of submucosal tissue. The variety of surgical techniques available indicates the lack of consensus on the optimal technique. Radiofrequency tissue reduction is a surgical procedure that uses radiofrequency heating to induce submucosal tissue destruction, leading to the reduction of tissue volume. This energy induces ion agitation within the tissue, which increases the local temperature and causes a thermal lesion that should occur in the deep mucosa without damaging the surface. The healing process secondarily induces fibrosis with wound contraction, leading to tissue volume reduction. Radiofrequency ablation is an efficient, easily applicable technique, which does not lead to serious complications in the treatment of the nasal obstruction caused by inferior turbinate hypertrophy. PMID:21303320

Sapç?, Tar?k; Güvenç, Melih Güven; Evcimik, Muhammed Fatih

176

Radiofrequency treatment for inferior turbinate hypertrophy.  

UK PubMed Central (United Kingdom)

Radiofrequency ablation (RFA) is a technique which causes a reduction in tissue amount using ablation by high-frequency current. Beside other surgical tools, RFA has become quite popular over the past decade. Hypertrophy of the inferior turbinate is a common cause of chronic nasal obstruction. There is no agreement on how to deal with this problem. An ideal procedure for turbinate reduction should be performed with minimal discomfort or adverse reactions and should preserve the physiologic function of the turbinate, such as regulation of humidification and temperature of inspired air. All the current techniques have potential short and long-term complications such as bleeding and atrophic rhinitis. No technique is perfect, and the main goal of turbinate surgery should be the preservation of mucosal surfaces with reduction of submucosal tissue. The variety of surgical techniques available indicates the lack of consensus on the optimal technique. Radiofrequency tissue reduction is a surgical procedure that uses radiofrequency heating to induce submucosal tissue destruction, leading to the reduction of tissue volume. This energy induces ion agitation within the tissue, which increases the local temperature and causes a thermal lesion that should occur in the deep mucosa without damaging the surface. The healing process secondarily induces fibrosis with wound contraction, leading to tissue volume reduction. Radiofrequency ablation is an efficient, easily applicable technique, which does not lead to serious complications in the treatment of the nasal obstruction caused by inferior turbinate hypertrophy.

Sapç? T; Güvenç MG; Evcimik MF

2011-01-01

177

Argon plasma coagulation for inferior turbinate reduction.  

UK PubMed Central (United Kingdom)

Surgical reduction of the inferior turbinate remains a widely used therapy for nasal obstruction caused by hyperplastic turbinates. Current methods are costly and time-consuming, require nasal packing, and cause extended postoperative swelling. Argon plasma coagulation (APC) is a new, innovative technique in otorhinolaryngological surgery that is based on high-frequency electrical current. The current is transmitted through ionized argon gas (plasma) contact-free to the tissue surface and creates a coagulation and devitalization zone with limited penetration. Forty-five patients with nasal obstruction were treated under local anesthesia for reduction of the inferior turbinates with APC. Seventy-six percent of the patients reported an improvement of postoperative swelling within the first week. After 3 months, 86% reported having better nasal airflow than they had before the operation. Macroscopically, after 4 weeks the turbinate was covered by normal mucosa in 51% of the patients. Crust formation was minimal, and no bleeding occurred. Turbinate reduction with APC is an alternative technique with many advantages, and the results are comparable to those of standard techniques. Ninety-five percent of the patients were satisfied with the operation.

Bergler W; Riedel F; Götte K; Hörmann K

2000-09-01

178

Influence of premolar extractions on the facial profile evaluated by the Holdaway analysis/ Influência de exodontias de pré-molares no perfil facial avaliada pela análise de Holdaway  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Este trabalho retrospectivo tem como proposta avaliar pacientes tratados com exodontias de pré-molares através de cefalometria em telerradiografia de perfil, comparando o efeito de diferentes protocolos de exodontias no perfil. METODOLOGIA: Oitenta e sete pacientes (31 meninos e 56 meninas) foram selecionados da clínica particular de três ortodontistas diplomados pelo Board Brasileiro de Ortodontia e Ortopedia Facial. Estes pacientes foram tratados com apare (more) lho fixo Edgewise foram divididos em três grupos, compreendendo a sequência de exodontia de pré-molares empregada Grupo 40 compreendendo 22 pacientes tratados com exodontia de primeiros pré-molares superiores, Grupo 44 compreendendo 43 pacientes tratados com exodontia de quatro primeiros pré-molares e Grupo 45 compreendendo 22 pacientes tratados com exodontia de primeiros pré-molares superiores e segundos inferiores. A Análise de Holdaway foi utilizada para quantificar e comparar os perfis antes e após o tratamento dos grupos. RESULTADOS: O teste t-Student mostrou melhora no perfil em todos os grupos. Quando comparados entre si, ANOVA revelou que apenas a medida sulco lábio inferior em relação à linha H apresentou diferenças nas mudanças incrementais proporcionadas pelo tratamento, em que o grupo 44 apresentou uma diferença significativamente superior ao grupo 40. CONCLUSÃO: A partir dos resultados concluiu-se que os protocolos produzem aparências faciais semelhantes. Abstract in english PURPOSE: This retrospective study aimed at assessing patients treated with extraction of premolars through cephalometry in lateral teleradiography, comparing the effect of different tooth extraction protocols on the facial profile. METHODS: For this study, 87 patients (31 boys and 56 girls) were selected from the private practices of three dentists certified by the Brazilian Board of Orthodontics and Facial Orthopedics. These patients were treated with fixed edgewise appl (more) iance and divided into three groups, according to the sequence in which premolars were extracted "Group 40" comprised 22 patients treated with extractions of the first two superior premolars, adopted as the control group; "Group 44" comprised 43 patients treated with extractions of the four first premolars; and "Group 45" comprised 22 patients treated with extractions of first superior premolars and second inferior premolars. The Holdaway analysis was used to quantify and compare the group profiles before and after treatment. RESULTS: Student's t-tests showed a profile improvement in all groups. When groups were compared, ANOVA showed that only the Inferior sulcus to the H line showed differences in incremental changes resulting from the treatment. Group 44 showed a significantly higher difference than Group 40. CONCLUSION: We conclude that the protocols produce similar facial appearances.

Allgayer, Susiane; Lima, Eduardo M. Santayana de; Mezomo, Maurício Barbieri

2011-01-01

179

Endodontic management of middle mesial canal of the mandibular molar.  

UK PubMed Central (United Kingdom)

Thorough knowledge of root canal morphology and unusual anatomy of the tooth is critical for successful endodontic treatment. Although the most common configuration is two roots and three root canals, mandibular molars might have many different combinations. In the literature, it is less described about three mesial canals and two distal canals in mandibular second molars, indicating a rare anatomical configuration. A case of unusual root canal morphology is presented to demonstrate anatomical variations in mandibular molars. Endodontic therapy was performed in a mandibular second molar with five separate canals, three mesial and two distal. This report points out the importance of looking for additional canals and unusual canal morphology, because knowledge of their existence might occasionally enable clinicians to treat a case successfully that otherwise might have ended in failure. In conclusion, every attempt should be made to find and treat all root canals of a tooth.

Sundaresh KJ; Srinivasan R; Mallikarjuna R; Rajalbandi S

2013-01-01

180

Excess Molar Volume of Binary Systems Containing Mesitylene  

Directory of Open Access Journals (Sweden)

Full Text Available This paper presents a review of density measurements for binary systems containing 1,3,5-trimethylbenzene (mesitylene) with a variety of organic compounds at atmospheric pressure. Literature data of the binary systems were divided into nine basic groups by the type of contained organic compound with mesitylene. The excess molar volumes calculated from the experimental density values have been compared with literature data. Densities were measured by a few experimental methods, namely using a pycnometer, a dilatometer or a commercial apparatus. The overview of the experimental data and shape of the excess molar volume curve versus mole fraction is presented in this paper. The excess molar volumes were correlated by Redlich–Kister equation. The standard deviations for fitting of excess molar volume versus mole fraction are compared. Found literature data cover a huge temperature range from (288.15 to 343.15) K.

Morávková, L.; Sedláková, Z.

2013-01-01

 
 
 
 
181

Endodontic management of middle mesial canal of the mandibular molar.  

Science.gov (United States)

Thorough knowledge of root canal morphology and unusual anatomy of the tooth is critical for successful endodontic treatment. Although the most common configuration is two roots and three root canals, mandibular molars might have many different combinations. In the literature, it is less described about three mesial canals and two distal canals in mandibular second molars, indicating a rare anatomical configuration. A case of unusual root canal morphology is presented to demonstrate anatomical variations in mandibular molars. Endodontic therapy was performed in a mandibular second molar with five separate canals, three mesial and two distal. This report points out the importance of looking for additional canals and unusual canal morphology, because knowledge of their existence might occasionally enable clinicians to treat a case successfully that otherwise might have ended in failure. In conclusion, every attempt should be made to find and treat all root canals of a tooth. PMID:23349182

Sundaresh, K J; Srinivasan, Raghu; Mallikarjuna, Rachappa; Rajalbandi, Sandeep

2013-01-23

182

Molar and molecular analysis: two visions of behavior  

Directory of Open Access Journals (Sweden)

Full Text Available The confrontation between the molar and the molecular approach to the study of behavior has regainedimportance. Both viewpoints are contrasted in this article, indicating their common ground butemphasizing its discrepancies. These discrepancies are present in the conceptualization of behavior asevent, in the interpretation of behavioral data (illustrated with the study of avoidance behavior), and inthe comprehension of mental events (illustrated with the notion of pain). In all these instances, thetheoretical superiority of a molar over a molecular perspective is evident.

FEDERICO SANABRIA

2002-01-01

183

Outcome of molar pregnancies in Malaysia: a tertiary centre experience.  

Science.gov (United States)

Gestational trophoblastic disease (GTD) is a common problem among Asian ethnics. A total of 102 women with molar pregnancies between 1 January 2005 and 31 December 2010, were analysed. The aim of the study was to determine the outcome of all molar pregnancies in our institution. The local incidence of molar pregnancy was 2.6 per 1,000 deliveries. A total of 48 women (47.1%) had complete hydatidiform mole and another 54 (52.9%) had partial mole. The mean age of the women with molar pregnancies was 32.0 ± 7.9 years. The mean gestational age at initial diagnosis was 11 weeks ± 3 days. The majority (97 women, 95.1%) had symptoms of vaginal bleeding and 18 (17.6%) women had a uterus larger than dates. A total of 48 (47.1%) women had ultrasound scan findings of 'snow-storm' appearance. None of the women with uncomplicated molar pregnancy had evidence of relapse following one undetectable serum ?-hCG level. Four out of the 102 women (3.9%) developed persistent trophoblastic disease before attaining one undetectable serum ?-hCG level. All four women required single agent methotrexate and they remained in remission. The prognosis for uncomplicated molar pregnancy is good. Establishment of a National Trophoblastic Centre is recommended to maintain optimal outcome. PMID:23445147

Nirmala, C K; Nor Azlin, M I; Harry, S R; Lim, P S; Shafiee, M N; Nur Azurah, A G; Omar, M H; Hatta, M D

2013-02-01

184

Outcome of molar pregnancies in Malaysia: a tertiary centre experience.  

UK PubMed Central (United Kingdom)

Gestational trophoblastic disease (GTD) is a common problem among Asian ethnics. A total of 102 women with molar pregnancies between 1 January 2005 and 31 December 2010, were analysed. The aim of the study was to determine the outcome of all molar pregnancies in our institution. The local incidence of molar pregnancy was 2.6 per 1,000 deliveries. A total of 48 women (47.1%) had complete hydatidiform mole and another 54 (52.9%) had partial mole. The mean age of the women with molar pregnancies was 32.0 ± 7.9 years. The mean gestational age at initial diagnosis was 11 weeks ± 3 days. The majority (97 women, 95.1%) had symptoms of vaginal bleeding and 18 (17.6%) women had a uterus larger than dates. A total of 48 (47.1%) women had ultrasound scan findings of 'snow-storm' appearance. None of the women with uncomplicated molar pregnancy had evidence of relapse following one undetectable serum ?-hCG level. Four out of the 102 women (3.9%) developed persistent trophoblastic disease before attaining one undetectable serum ?-hCG level. All four women required single agent methotrexate and they remained in remission. The prognosis for uncomplicated molar pregnancy is good. Establishment of a National Trophoblastic Centre is recommended to maintain optimal outcome.

Nirmala CK; Nor Azlin MI; Harry SR; Lim PS; Shafiee MN; Nur Azurah AG; Omar MH; Hatta MD

2013-02-01

185

Finite Element Reconstruction of a Mandibular First Molar  

Science.gov (United States)

Introduction Mandibular first molar is the most important tooth with complicated morphology. In finite element (FE) studies, investigators usually prefer to model anterior teeth with a simple and single straight root; it makes the results deviate from the actual case. The most complicated and time-consuming step in FE studies is modeling of the desired tooth, thus this study was performed to establish a finite element method (FEM) of reconstructing a mandibular first molar with the greatest precision. Materials and Methods An extracted mandibular first molar was digitized, and then radiographed from different aspects to achieve its outer and inner morphology. The solid model of tooth and root canals were constructed according to this data as well as the anatomy of mandibular first molar described in the literature. Result A three-dimensional model of mandibular first molar was created, giving special consideration to shape and root canal system dimensions. Conclusion This model may constitute a basis for investigating the effect of different clinical situations on mandibular first molars in vitro, especially on its root canal system. The method described here seems feasible and reasonably precise foundation for investigations.

Ehsani, Sara; Mirhashemi, Fatemeh Sadat; Asgary, Saeed

2013-01-01

186

Effects of maxillary molar distalization with Zygoma-Gear Appliance.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To evaluate the dentoalveolar, skeletal, and soft tissue effects of the Zygoma-Gear Appliance (ZGA) when used for bilateral distalization of the maxillary molars. MATERIALS AND METHODS: The study group included 15 patients (mean age, 15.87 ± 1.09 years; range: 14-18 years) treated with the ZGA system supported with zygomatic anchorage miniplates. The changes due to the distalization were evaluated from the lateral cephalometric films taken before and after distalization by means of a paired t-test. RESULTS: The mean treatment period required to achieve a Class I molar relationship was 5.21 months. The distalization amount of the maxillary molars was 4.37 ± 2.15 mm (P < .001), and, thus, the rate for the distal movement of the molars was 0.84 mm per month. Maxillary first molars showed a slight intrusion (0.50 mm) (P > .05), while distal tipping was only 3.30° ± 2.31° (P > .05). Furthermore, there was a decrease in overjet (-0.50 mm) (P > .05), indicating that there was no anchorage loss with use of the ZGA. CONCLUSIONS: Maxillary molar distalization without anchorage loss can be achieved in a short time with ZGA.

Nur M; Bayram M; Celikoglu M; Kilkis D; Pampu AA

2012-07-01

187

Outcome of Subsequent Pregnancies in Familial Molar Pregnancy  

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Full Text Available Familial recurrent molar pregnancy is an exceedingly rare condition, in which completehydatidiform moles are mostly diploid but biparental in origin and the outcome of subsequentpregnancies is likely to be a hydatidiform mole or other type of reproductiveloss. We previously reported a case of familial molar pregnancy (family K) comprisingfive affected members (four sisters and one of their cousins) each with at least one hydatidiformmole (HM). In addition to the molar pregnancies, these patients have a total ofthree miscarriages and 8 normal pregnancies leading to healthy children; but the youngestmember of this family has given birth to a boy with Down syndrome.Our second family (case S) includes two sisters with diploid biparental complete moles.They have a total of six molar pregnancies with no living child. Recently the younger sisterhad a partial molar pregnancy with apparently normal XX fetus accompanying diffusemolar changes of the placenta that led to preeclampsia and preterm delivery.Overall, these families have had 26 pregnancies including 12 molar pregnancies (completeor partial) and three abortions.We concluded that these families are predisposed to various genetic mutations, chromosomalabnormalities and clinical manifestations, which affect their offspring. Furtherstudies of patients are needed to determine any relationship between a history of familialmolar pregnancy and trisomy or other chromosomal abnormalities in offspring and geneticmutations in the products of conception to complete the puzzle and manage familialmolar pregnancy.

Masoumeh Fallahian; Forough Foroughi; Mohammad Vasei; Shahrzad Tavana; Maryam Ghanbary; Maryam Monajemzadeh; Anahita Tavana

2013-01-01

188

Morphological Alterations of the Surfaces of Enamel and Dentin of Deciduous Teeth Irradiated with Nd:YAG, C0(2)and Diode Lasers Alteraciones Morfológicas de las Superficies de Esmalte y Dentina de Dientes Deciduos Irradiados con Láseres de Nd:YAG, C0(2) y Diodo  

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Full Text Available In this work, we studied the effects of C0(2), Nd:YAG and diode lasers on the enamel and dentin of deciduous human teeth. After the irradiations, the samples were duly prepared and set up on metallic bases, covered with gold and examined in the scanning electron microscope. The results showed that the irradiation with the C0(2) mode locked laser with 1.0 W power caused melting and irregularities with small cavities on the surface of the enamel. The irradiated area on the dentin surface appeared circular and well delimited, containing blocks of dentin and cracks. By using the pulsed Nd:YAG laser with 1.0 W mean power and 10 Hz frequency, the enamel surface presented granules of molten enamel, with a typical melting look. The irradiated dentin surface presented a cavity with a margin elevated with granules and holes, and its bottom presented dentinary tubules with globules of melted dentin. Irradiation with the mode locked of diode laser with 1.0 W mean power, showed the formation of a melted and evenly resolidified enamel surface, and the dentin surface presented a block of melted dentin with adjacent regions of normal dentin, evidently with a relatively smooth surface.El estudio presenta algunos resultados del efecto del láser de C0(2), Nd:YAG y Diodo sobre el esmalte y dentina de dientes deciduos humanos. Después de las irradiaciones, se prepararon las muestras y se montaron sobre bases metálicas, cubiertas con oro y examinadas en el microscopio electrónico de barrido. Los resultados mostraron que la irradiación con el láser C0(2) en modo conmutado con 1,0 W de potencia, provoca fusión e irregularidades con pequeños cráteres en la superficie del esmalte. En la superficie de la dentina, el área irradiada se mostró circular y bien definido, con bloques de dentina y grietas. Con el uso del láser Nd: YAG en el modo pulsado con 1,0 W de potencia media y frecuencia de 10Hz, la superficie del esmalte presentó granulos de esmalte fundido, dándole el aspecto de "melting" (derretido). La superficie de dentina irradiada presentó un cráter con borde elevado con granulos y agujeros, y su fondo presentó túbulos dentinarios con glóbulos de dentina derretida. La irradiación del láser de Diodo en el modo conmutado con potencia media de 1,0 W, provocó la formación de una superficie de esmalte fusionada y resolidificada uniforme y la superficie de la dentina presentó un bloque de dentina fundida en la regiones adyacentes de dentina normal, mostrando una superficie bastante lisa.

Mónica Rodrigues de Souza; Ii-Sei Watanabe; Luciane H Azevedo; Edgar Y Tanji

2009-01-01

189

Morphological Alterations of the Surfaces of Enamel and Dentin of Deciduous Teeth Irradiated with Nd:YAG, C0(2)and Diode Lasers/ Alteraciones Morfológicas de las Superficies de Esmalte y Dentina de Dientes Deciduos Irradiados con Láseres de Nd:YAG, C0(2) y Diodo  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish El estudio presenta algunos resultados del efecto del láser de C0(2), Nd:YAG y Diodo sobre el esmalte y dentina de dientes deciduos humanos. Después de las irradiaciones, se prepararon las muestras y se montaron sobre bases metálicas, cubiertas con oro y examinadas en el microscopio electrónico de barrido. Los resultados mostraron que la irradiación con el láser C0(2) en modo conmutado con 1,0 W de potencia, provoca fusión e irregularidades con pequeños cráteres (more) en la superficie del esmalte. En la superficie de la dentina, el área irradiada se mostró circular y bien definido, con bloques de dentina y grietas. Con el uso del láser Nd: YAG en el modo pulsado con 1,0 W de potencia media y frecuencia de 10Hz, la superficie del esmalte presentó granulos de esmalte fundido, dándole el aspecto de "melting" (derretido). La superficie de dentina irradiada presentó un cráter con borde elevado con granulos y agujeros, y su fondo presentó túbulos dentinarios con glóbulos de dentina derretida. La irradiación del láser de Diodo en el modo conmutado con potencia media de 1,0 W, provocó la formación de una superficie de esmalte fusionada y resolidificada uniforme y la superficie de la dentina presentó un bloque de dentina fundida en la regiones adyacentes de dentina normal, mostrando una superficie bastante lisa. Abstract in english In this work, we studied the effects of C0(2), Nd:YAG and diode lasers on the enamel and dentin of deciduous human teeth. After the irradiations, the samples were duly prepared and set up on metallic bases, covered with gold and examined in the scanning electron microscope. The results showed that the irradiation with the C0(2) mode locked laser with 1.0 W power caused melting and irregularities with small cavities on the surface of the enamel. The irradiated area on the (more) dentin surface appeared circular and well delimited, containing blocks of dentin and cracks. By using the pulsed Nd:YAG laser with 1.0 W mean power and 10 Hz frequency, the enamel surface presented granules of molten enamel, with a typical melting look. The irradiated dentin surface presented a cavity with a margin elevated with granules and holes, and its bottom presented dentinary tubules with globules of melted dentin. Irradiation with the mode locked of diode laser with 1.0 W mean power, showed the formation of a melted and evenly resolidified enamel surface, and the dentin surface presented a block of melted dentin with adjacent regions of normal dentin, evidently with a relatively smooth surface.

Souza, Mónica Rodrigues de; Watanabe, Ii-Sei; Azevedo, Luciane H; Tanji, Edgar Y

2009-06-01

190

Relación entre Niveles de Inclusión de Terceros Molares Mandibulares e Índices Antropométricos Físicos de la Mandíbula en Etnias Atacameñas y Aymaras del Norte de Chile Relationship between Levels of Third Molar Inclusion and Physical Anthropometric Indices of the Mandible in the Atacameño and Aymara Ethnic Groups of Northern Chile  

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Full Text Available La patología relacionada con el proceso de formación odontogénica, desarrollo y erupción de terceros molares, constituyen uno de los motivos más frecuentes de consulta odontológica. La mayoría de los autores coinciden en que el tercer molar inferior es el diente con mayor frecuencia de inclusión pero existen discrepancias respecto a la influencia de factores ecológicos y raciales que expliquen esa condición. Se sabe que los individuos de un grupo étnico tienen características físicas especiales y esto también se observa a nivel facial de acuerdo a las características del macizo máxilo-mandibular. Esto motivó investigar la relación entre niveles de inclusión de terceros molares mandibulares e índices antropométricos físicos de la mandíbula en grupos étnicos atacameños y aymaras del norte de Chile. De esta población se estableció una muestra de 56 pacientes para la determinación de grupos sanguíneos y factor Rh y establecer el grado de mestizaje. Asimismo se efectuó un examen clínico intra-oral para precisar el estado de erupción o ausencia de terceros molares inferiores y se tomaron ortopantomografías para determinar el estado de inclusión o agenesia de los dientes no visibles en la cavidad oral, a través de la clasificación de profundidad respecto del límite amelo-cementario del segundo molar presente. Finalmente, se procedió a registrar diferentes medidas del macizo máxilo-facial para establecer los índices de la rama bilateral e índice cigo-mandibular en cada uno de los individuos seleccionados. El estudio compara sus resultados con otras investigaciones y pudo determinar en ambas poblaciones indígenas la prevalencia de terceros molares inferiores (85,72% derecha y 83,93% izquierda).The pathology associated with the formation, development and eruption of third molars is one of the most frequent reasons for dental consults. Several authors agree that the third molar is the most frequent inclusion tooth, there is however, disagreement about the influence of environmental and racial factors that explain this condition. It is known that individuals of one ethnic group have particular physical characteristics, which are also observed at facial level according to characteristics of maxillo-mandibular mass. This prompted research regarding the relationship between levels of third molar inclusion and physical anthropometric indices of the mandible in Atacameño and Aymara ethnic groups in Northern Chile. A sample of 56 patients to determine blood type and Rh factor was established to assess the degree of mixing. An intra-oral clinical examination was also performed to clarify the state of eruption or absence of third molars. Radiographs were taken to determine the inclusion or agenesis if teeth were not visible in the oral cavity, through classification of depth on cementum-enamel boundary of the second molar present. Finally we proceeded to record various measurements of maxillo-facial massif to set the bilateral mandibular ramus and ziggo mandibular indexes in each of the selected individuals. The study compares results with other research and determined in both indigenous populations, the prevalence of third molars (85.72% right, and 83.93% left).

Víctor Javier Beltrán Varas; Ramón Fuentes Fernández; Alejandro Bustos Cortés; Antonio Sanhueza Campos

2011-01-01

191

Avaliação da eficácia da analgesia preemptiva na cirurgia de extração de terceiros molares inclusos Evaluación de la eficácia de la analgesia de prevención en la cirugía de extracción de terceros molares incluidos Assessment of preemptive analgesia efficacy in surgical extraction of third molars  

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Full Text Available JUSTIFICATIVA E OBJETIVOS: A literatura sobre analgesia preemptiva é controversa. A confiabilidade dos resultados e a dificuldade de reprodutibilidade das pesquisas contribuem para a não elucidação do tema. O objetivo desse estudo é testar a eficácia da administração preemptiva de Cetoprofeno 150 mg via oral dois dias antes da cirurgia de extração deterceiros molares, comparando no mesmo paciente com a administração pós-operatória. MÉTODO: Treze pacientes foram submetidos à cirurgia de extração bilateral de terceiros molares inferiores inclusos em dois procedimentos distintos. De forma randomizada e duplo cega, em um procedimento foi administrado Cetoprofeno 150 mg via oral a cada 12 horas dois dias antes da cirurgia e, após o procedimento, continuou-se o mesmo medicamento por mais três dias. De outro lado, foi utilizado um controle (placebo) via oral a cada 12 horas dois dias antes da cirurgia e, após o procedimento, continuou-se o Cetoprofeno 150 mg a cada 12 horas por mais três dias. A dor pós-operatória foi avaliada por meio da escala visual analógica, da escala nominal e da quantidade de consumo de analgésicos de resgate. RESULTADOS: Não foi observada diferença estatisticamente significante na dor pós-operatória entre o tratamento preemptivo e o controle. CONCLUSÃO: Neste modelo experimental, a analgesia preemptiva não se mostrou eficaz na redução da dor pós-operatória na cirurgia de extração de terceiros molares inclusos em comparação com a administração pós-operatória do mesmo medicamento.JUSTIFICATIVA Y OBJETIVOS: La literatura sobre la analgesia de prevención es controversial. La confiabilidad de los resultados y la dificultad de reproductibilidad de las investigaciones contribuyen para que el tema no quede clarificado en su totalidad. El objetivo de este estudio, es comprobar la eficacia de la administración de prevención del Cetoprofeno 150 mg por vía oral dos días antes de la cirugía de terceros molares, comparando al mismo paciente con la administración postoperatoria. MÉTODO: Trece pacientes se sometieron a la cirugía de extracción bilateral de terceros molares inferiores incluidos en dos procedimientos distintos. De forma randomizada y doble ciega, en un procedimiento se administró Cetoprofeno 150 mg por vía oral a cada 12 horas dos días antes de la cirugía y después del procedimiento continuamos con el mismo medicamento por tres días más. Por otra parte, fue utilizado un control (placebo) vía oral a cada 12 horas dos días antes de la cirugía y después del procedimiento se continuó con el Cetoprofeno 150 mg a cada 12 horas por tres días más. El dolor del postoperatorio, se evaluó por medio de la escala visual analógica, de la escala nominal y de la cantidad de consumo de analgésicos de rescate. RESULTADOS: No se observaron diferencias estadísticamente significativas en el dolor postoperatorio entre el tratamiento de prevención y el control. CONCLUSIONES: En este modelo experimental, la analgesia de prevención no fue eficaz en la redución del dolor postoperatorio en la cirugía de extracción de terceros molares incluidos en comparación con la administración postoperatoria del mismo medicamento.BACKGROUND AND OBJECTIVES: Literature on preemptive analgesia is controversial. Reliability of results and difficult reproducibility of research contribute for non-elucidation of the subject. The aim of this study is to test the efficacy of oral ketoprofen (150 mg) preemptively administrated two days before third molar surgery, compared with postoperative administration in the same patient. METHODS: Thirteen patients underwent surgical removal of bilateral third molar in two separate procedures. In a random and double blind procedure, oral ketoprofen 150 mg was administered every 12 hours two days before surgery and, after the procedure, the same drug was administered for three days. On the other side, a control (placebo) was used orally every 12 hours two days before surgery and, after the procedure, ketoprofen 150 mg wa

Jorge Luiz Jacob Liporaci Junior

2012-01-01

192

Avaliação da eficácia da analgesia preemptiva na cirurgia de extração de terceiros molares inclusos/ Assessment of preemptive analgesia efficacy in surgical extraction of third molars/ Evaluación de la eficácia de la analgesia de prevención en la cirugía de extracción de terceros molares incluidos  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese JUSTIFICATIVA E OBJETIVOS: A literatura sobre analgesia preemptiva é controversa. A confiabilidade dos resultados e a dificuldade de reprodutibilidade das pesquisas contribuem para a não elucidação do tema. O objetivo desse estudo é testar a eficácia da administração preemptiva de Cetoprofeno 150 mg via oral dois dias antes da cirurgia de extração deterceiros molares, comparando no mesmo paciente com a administração pós-operatória. MÉTODO: Treze pacientes f (more) oram submetidos à cirurgia de extração bilateral de terceiros molares inferiores inclusos em dois procedimentos distintos. De forma randomizada e duplo cega, em um procedimento foi administrado Cetoprofeno 150 mg via oral a cada 12 horas dois dias antes da cirurgia e, após o procedimento, continuou-se o mesmo medicamento por mais três dias. De outro lado, foi utilizado um controle (placebo) via oral a cada 12 horas dois dias antes da cirurgia e, após o procedimento, continuou-se o Cetoprofeno 150 mg a cada 12 horas por mais três dias. A dor pós-operatória foi avaliada por meio da escala visual analógica, da escala nominal e da quantidade de consumo de analgésicos de resgate. RESULTADOS: Não foi observada diferença estatisticamente significante na dor pós-operatória entre o tratamento preemptivo e o controle. CONCLUSÃO: Neste modelo experimental, a analgesia preemptiva não se mostrou eficaz na redução da dor pós-operatória na cirurgia de extração de terceiros molares inclusos em comparação com a administração pós-operatória do mesmo medicamento. Abstract in spanish JUSTIFICATIVA Y OBJETIVOS: La literatura sobre la analgesia de prevención es controversial. La confiabilidad de los resultados y la dificultad de reproductibilidad de las investigaciones contribuyen para que el tema no quede clarificado en su totalidad. El objetivo de este estudio, es comprobar la eficacia de la administración de prevención del Cetoprofeno 150 mg por vía oral dos días antes de la cirugía de terceros molares, comparando al mismo paciente con la admin (more) istración postoperatoria. MÉTODO: Trece pacientes se sometieron a la cirugía de extracción bilateral de terceros molares inferiores incluidos en dos procedimientos distintos. De forma randomizada y doble ciega, en un procedimiento se administró Cetoprofeno 150 mg por vía oral a cada 12 horas dos días antes de la cirugía y después del procedimiento continuamos con el mismo medicamento por tres días más. Por otra parte, fue utilizado un control (placebo) vía oral a cada 12 horas dos días antes de la cirugía y después del procedimiento se continuó con el Cetoprofeno 150 mg a cada 12 horas por tres días más. El dolor del postoperatorio, se evaluó por medio de la escala visual analógica, de la escala nominal y de la cantidad de consumo de analgésicos de rescate. RESULTADOS: No se observaron diferencias estadísticamente significativas en el dolor postoperatorio entre el tratamiento de prevención y el control. CONCLUSIONES: En este modelo experimental, la analgesia de prevención no fue eficaz en la redución del dolor postoperatorio en la cirugía de extracción de terceros molares incluidos en comparación con la administración postoperatoria del mismo medicamento. Abstract in english BACKGROUND AND OBJECTIVES: Literature on preemptive analgesia is controversial. Reliability of results and difficult reproducibility of research contribute for non-elucidation of the subject. The aim of this study is to test the efficacy of oral ketoprofen (150 mg) preemptively administrated two days before third molar surgery, compared with postoperative administration in the same patient. METHODS: Thirteen patients underwent surgical removal of bilateral third molar in (more) two separate procedures. In a random and double blind procedure, oral ketoprofen 150 mg was administered every 12 hours two days before surgery and, after the procedure, the same drug was administered for three days. On the other side, a control (placebo) was used oral

Liporaci Junior, Jorge Luiz Jacob

2012-08-01

193

Laser reduction of inferior turbinates in children.  

UK PubMed Central (United Kingdom)

Perennial nasal obstruction in children refractory to medical treatment may be managed by turbinate reduction. Turbinectomy may involve a risk of significant postoperative bleeding and requires nasal packing. Submucosal diathermy is followed by nasal congestion and crusting; recurrent nasal obstruction is frequent at fifteen months. This study assesses the benefits of carbon dioxide laser reduction of inferior turbinates in 20 children. Intraoperative blood loss was negligible and no nasal packing was required. There was minimal postoperative discomfort which required no analgesia. No postoperative haemorrhage was recorded. The children were able to drink and eat by 4 and 6 hours respectively. Relief of nasal obstruction occurred one to seven days postoperatively and was confirmed by rhinohygrometry. Nasal patency was maintained on eighteen to twenty-four months follow up. Mucosal healing was completed by four weeks. Mucosal saccharin clearances were normal postoperatively. We conclude laser turbinectomy is an excellent means of turbinate reduction in selected children.

Pang YT; Willatt DJ

1995-10-01

194

Inferior alveolar nerve injuries associated with mandibular fractures.  

Science.gov (United States)

The study evaluates the incidence of inferior alveolar nerve injuries in mandibular fractures, the duration of their recovery, and the factors associated with them. Fifty-two patients with mandibular fractures involving the ramus, angle, and body regions were included in this study; the inferior alveolar nerve was examined for neurological deficit posttraumatically using sharp/blunt differentiation method, and during the follow-up period the progression of neural recovery was assessed. The incidence of neural injury of the inferior alveolar nerve was 42.3%, comminuted and displaced linear fractures were associated with higher incidence of inferior alveolar nerve injury and prolonged recovery time, and recovery of inferior alveolar nerve function occurred in 91%.Fractures of the mandible involving the ramus, angle, and body regions, and comminuted and displaced linear fractures are factors that increase the incidence of inferior alveolar nerve injuries. Missile injuries can be considered as another risk factor. PMID:23147318

Bede, Salwan Yousif Hanna; Ismael, Waleed Khaleel; Al-Assaf, Dhuha A; Omer, Saad Salem

2012-11-01

195

Molars extraction for bone graft study in rabbits/ Extração de molares para estudos de enxertos ósseos em coelhos  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: Descrever uma técnica cirúrgica em coelhos para avaliação de enxertos ósseos. MÉTODOS: A técnica operatória consiste numa incisão na topografia da comissura labial até o ultimo molar. Uma incisão de 1cm no rebordo para expor o osso alveolar e a região cervical dos molares. Realizou-se a exodontia com fórceps e o alvéolo é preenchido com hidroxiapatita. Após o tempo de cicatrização é realizada a avaliação histológica. RESULTADOS: A análise (more) histológica mostrou o novo osso formado rodeando biomaterial. CONCLUSÃO: O modelo cirúrgico para avaliação de enxertos ósseos utilizando molares de coelhos se mostrou factível. Abstract in english PURPOSE: The aim of this study was to describe an experimental surgical technique to be used in the evaluation of bone grafts in rabbits. METHODS: The operative technique was performed in jaws, with external approach from the labial commissure to the last molar tooth. An incision about 1cm extended forward to the alveolar ridge, followed by a exposing the cervical region of the alveolar bone and dental elements was done. Thus, after extraction of first molar with forceps, (more) the tooth socket left was filled with hydroxyapatite. The bone gain was analyzed by histopathological studies. RESULTS: The histological analyses indicated formed bone surrounding the biomaterial. CONCLUSION: The experimental model using the tooth socket of the rabbit molar is a feasible procedure for studies of bone grafts.

Manso, José Eduardo Ferreira; Mourão, Carlos Fernando de Almeida Barros; Pinheiro, Flávio Alexandre Lima; Ferreira, Manoel Luiz; Silva, Paulo César; Schanaider, Alberto

2011-01-01

196

Molars extraction for bone graft study in rabbits Extração de molares para estudos de enxertos ósseos em coelhos  

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Full Text Available PURPOSE: The aim of this study was to describe an experimental surgical technique to be used in the evaluation of bone grafts in rabbits. METHODS: The operative technique was performed in jaws, with external approach from the labial commissure to the last molar tooth. An incision about 1cm extended forward to the alveolar ridge, followed by a exposing the cervical region of the alveolar bone and dental elements was done. Thus, after extraction of first molar with forceps, the tooth socket left was filled with hydroxyapatite. The bone gain was analyzed by histopathological studies. RESULTS: The histological analyses indicated formed bone surrounding the biomaterial. CONCLUSION: The experimental model using the tooth socket of the rabbit molar is a feasible procedure for studies of bone grafts.OBJETIVO: Descrever uma técnica cirúrgica em coelhos para avaliação de enxertos ósseos. MÉTODOS: A técnica operatória consiste numa incisão na topografia da comissura labial até o ultimo molar. Uma incisão de 1cm no rebordo para expor o osso alveolar e a região cervical dos molares. Realizou-se a exodontia com fórceps e o alvéolo é preenchido com hidroxiapatita. Após o tempo de cicatrização é realizada a avaliação histológica. RESULTADOS: A análise histológica mostrou o novo osso formado rodeando biomaterial. CONCLUSÃO: O modelo cirúrgico para avaliação de enxertos ósseos utilizando molares de coelhos se mostrou factível.

José Eduardo Ferreira Manso; Carlos Fernando de Almeida Barros Mourão; Flávio Alexandre Lima Pinheiro; Manoel Luiz Ferreira; Paulo César Silva; Alberto Schanaider

2011-01-01

197

Variant Inferior Root of Ansa Cervicalis/ Variación de la Raíz Inferior del Asa Cervical  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish El asa cervical es un loop de nervios que se encuentra en la pared anterior de la vaina carotídea, en el triángulo carotídeo del cuello, que inerva los músculos infrahioideos. Su raíz superior tiene fibras del primer nervio cervical que sale del nervio hipogloso y se une a la raíz inferior formada por las ramas de los nervios cervicales segundo y tercero. Las dos raíces se unen para formar el asa cervical. La formación del asa cervical del nervio es relativamente (more) compleja, ya que su curso y ubicación varía a lo largo de los grandes vasos del cuello. En el lado izquierdo del cuello de un cadáver adulto de sexo masculino, la raíz inferior del asa cervical estaba ausente y las contribuciones de los ramos de C2 y C3 se unieron, de forma independiente, con la raíz superior del asa y así formar el loop. Abstract in english Ansa cervicalis is a loop of nerves found in the anterior wall of the carotid sheath in the carotid triangle of neck innervating infrahyoid muscles. Its superior root has fibres from the first cervical nerve that leaves the hypoglossal nerve and joins the inferior root formed by the branches from the second and third cervical nerves. The two roots join to form ansa cervicalis. The ansa cervicalis nerve formation is relatively complex, as its course and location along the (more) great vessels of the neck vary. In the present case on the left side of an adult male cadaver the inferior root was absent and the contributions from C2 and C3 were joining independently with the superior root of ansa to form ansa cervicalis. However no such variation was found in the ansa cervicalis formation on the right side.

Babu, B. Prakash

2011-03-01

198

Variant Inferior Root of Ansa Cervicalis Variación de la Raíz Inferior del Asa Cervical  

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Full Text Available Ansa cervicalis is a loop of nerves found in the anterior wall of the carotid sheath in the carotid triangle of neck innervating infrahyoid muscles. Its superior root has fibres from the first cervical nerve that leaves the hypoglossal nerve and joins the inferior root formed by the branches from the second and third cervical nerves. The two roots join to form ansa cervicalis. The ansa cervicalis nerve formation is relatively complex, as its course and location along the great vessels of the neck vary. In the present case on the left side of an adult male cadaver the inferior root was absent and the contributions from C2 and C3 were joining independently with the superior root of ansa to form ansa cervicalis. However no such variation was found in the ansa cervicalis formation on the right side.El asa cervical es un loop de nervios que se encuentra en la pared anterior de la vaina carotídea, en el triángulo carotídeo del cuello, que inerva los músculos infrahioideos. Su raíz superior tiene fibras del primer nervio cervical que sale del nervio hipogloso y se une a la raíz inferior formada por las ramas de los nervios cervicales segundo y tercero. Las dos raíces se unen para formar el asa cervical. La formación del asa cervical del nervio es relativamente compleja, ya que su curso y ubicación varía a lo largo de los grandes vasos del cuello. En el lado izquierdo del cuello de un cadáver adulto de sexo masculino, la raíz inferior del asa cervical estaba ausente y las contribuciones de los ramos de C2 y C3 se unieron, de forma independiente, con la raíz superior del asa y así formar el loop.

B. Prakash Babu

2011-01-01

199

Orthodontic space closure after first molar extraction without skeletal anchorage.  

UK PubMed Central (United Kingdom)

OBJECTIVE: The aim of the study was an analysis of effects and side-effects during mesialization of second molars after extraction of the first permanent molars using the anterior dentition/premolars (PM) as an anchorage unit. PATIENTS AND METHODS: A total of 35 patients were examined retrospectively who had undergone unilateral or bilateral first permanent molar extraction in the upper or lower arch due to carious lesions. Space closure was carried out in all cases through mesialization of the second molar using an elastic chain fixed to an edgewise stainless steel archwire and tying the anterior dentition/PM together with a continuous laceback ligature. Tooth movement was assessed from lateral cephalograms, orthopantomograms (OPGs) and images of the patient's study casts taken before and after the end of therapy. RESULTS: Space closure after first molar extractions by mesialization of the second molars without skeletal anchorage was largely achieved by bodily forward movement of the teeth, including a small tipping component or tooth-uprighting component when molars were already mesially inclined. Unilateral and bilateral mesialization of the second molars led to retrusion in the maxilla and mandible [(?incl.=-3.6° (max., bil.), ?incl.=-4.2° (mand., bil.)] and to translational retraction [(?s=-2.3 mm (max., bil.), ?s=-1.6 mm (mand., bil.)] of the incisors. Examination of the soft tissues revealed an increased posterior displacement of the upper and lower lips to the esthetic line [(?s=-2.8 mm (max. bil.), ?s=-2.2 mm (mand., bil.)]. In cases of unilateral mesialization less than 50% of the patients had a slight midline deviation in the mandible towards the extraction side. CONCLUSION: Side effects during mesialization of the second molars without skeletal anchorage in the anterior dentition/PM were observed primarily affecting the incisors integrated into the anterior anchorage unit. These side-effects resulted in posterior displacement of the soft tissues, including a change in profile. This must be taken into consideration when taking this therapeutic approach.

Jacobs C; Jacobs-Müller C; Luley C; Erbe C; Wehrbein H

2011-03-01

200

Estudo in vitro da resistência ao cisalhamento da colagem direta de tubos ortodônticos em molares In vitro study of shear bond strength in direct bonding of orthodontic molar tubes  

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Full Text Available INTRODUÇÃO: apesar da colagem direta despender menor tempo clínico, com maior preservação da integridade gengival, ainda hoje se observa uma alta incidência de bandagem dos molares. Portanto, torna-se interessante a idealização de recursos para o aumento da eficiência desse procedimento para dentes submetidos a maiores impactos mastigatórios, como, por exemplo, os molares. OBJETIVO: esse estudo teve o propósito de avaliar se a resistência à adesão com a aplicação de uma camada de resina adicional na região oclusal da interface tubo/dente aumenta a qualidade do procedimento de colagem direta de tubos em molares. MÉTODOS: selecionou-se uma amostra composta por 40 terceiros molares inferiores, que foram aleatoriamente divididos em 2 grupos: Grupo 1 - colagem direta convencional, seguida pela aplicação de uma camada de resina na oclusal da interface tubo/dente; e Grupo 2 - colagem direta convencional. O teste de resistência ao cisalhamento foi realizado 24 horas após a colagem, utilizando-se uma máquina de ensaio universal, operando a uma velocidade de 0,5mm/min. Os resultados foram analisados por meio do teste t independente. RESULTADOS: os valores médios obtidos nos testes de cisalhamento foram: 17,08MPa para o Grupo 1 e 12,60MPa para o Grupo 2. O Grupo 1 apresentou uma resistência ao cisalhamento estatisticamente significativa mais alta do que o Grupo 2. CONCLUSÃO: a aplicação de uma camada adicional de resina na oclusal da interface tubo/dente aumenta a qualidade da adesão do procedimento de colagem direta de tubos ortodônticos em molares.OBJECTIVE: Although direct bonding takes up less clinical time and ensures increased preservation of gingival health, the banding of molar teeth is still widespread nowadays. It would therefore be convenient to devise methods capable of increasing the efficiency of this procedure, notably for teeth subjected to substantial masticatory impact, such as molars. This study was conducted with the purpose of evaluating whether direct bonding would benefit from the application of an additional layer of resin to the occlusal surfaces of the tube/tooth interface. METHODS: A sample of 40 mandibular third molars was selected and randomly divided into two groups: Group 1 - Conventional direct bonding, followed by the application of a layer of resin to the occlusal surfaces of the tube/ tooth interface, and Group 2 - Conventional direct bonding. Shear bond strength was tested 24 hours after bonding with the aid of a universal testing machine operating at a speed of 0.5mm/min. The results were analyzed using the independent t-test. RESULTS: The shear bond strength tests yielded the following mean values: 17.08 MPa for Group 1 and 12.60 MPa for Group 2. Group 1 showed higher statistically significant shear bond strength than Group 2. CONCLUSIONS: The application of an additional layer of resin to the occlusal surfaces of the tube/tooth interface was found to enhance bond strength quality of orthodontic buccal tubes bonded directly to molar teeth.

Célia Regina Maio Pinzan Vercelino; Arnaldo Pinzan; Júlio de Araújo Gurgel; Fausto Silva Bramante; Luciana Maio Pinzan

2011-01-01

 
 
 
 
201

Dental Treatment Needs of Permanent First Molars in Mashhad Schoolchildren  

Science.gov (United States)

Background and aims In spite of their enormous importance, permanent first molars might be affected by caries in children in developing countries. The aim of this study was to evaluate the treatment needs of first permanent molars in a group of schoolchildren in Mashhad. Materials and methods This cross-sectional descriptive study was carried out on 700, 7-9 year-old students in primary schools in Mashhad. The schools were randomly selected from each district. Treatment needs and DMFT of first perma-nent molars were calculated. Data was analyzed using ANOVA, Chi-Square and t-test. Results A total of 95.3% of the children required dental treatment. Fissure sealant application and filling were the treat-ments most required in all age groups. The mean DMFT of first permanent molars was 1.31±1.4. It was significantly higher in girls than boys (P=0.040). Conclusion Great treatment needs and caries prevalence in permanent first molars in Mashhad schoolchildren show that dental caries is still a serious problem in the children of our society; therefore, education of parents and teachers is necessary for promoting children's oral health.

Ebrahimi, Masoumeh; Ajami, Behjat-Al-Molook; Sarraf Shirazi, Ali Reza; Afzal Aghaee, Monavar; Rashidi, Somayeh

2010-01-01

202

Uterine rupture following incomplete molar pregnancy: a case report  

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Full Text Available Background: In molar pregnancy, when hydatidiform changes are local and some embryonic components are observed, the term of partial mole is used. The risk of persistent trophoblastic tumor after partial mole is much lower than complete mole. In this persistent cases almost all are non metastatic. The aim of this study is to report a case of uterine rupture following incomplete molar pregnancy.Case presentation: The patient was a 26 year old woman with obstetric history of an abortion and one molar pregnancy and no child. She was referred to emergency unit in Ghaem University Hospital, Mashhad, Iran in May 2011. She had an evacuation curettage following molar pregnancy three months before and without any follow up visit. The patient was referred to emergency unit with hemorrhagic shock. She immediately underwent laparotomy. The uterine fundal rupture was repaired and evacuation curettage performed. In post operative evaluation, she had a nine millimeter metastatic nodule in base of right Lung. As a patient in low risk stage III, she received weekly intramuscular methotrexate (40mg/m2) for six courses. In follow up visit ?-hCG titer was negative (<10miu/ml) at 5th week. Conclusion: In cases of in complete molar pregnancy risk of metastasis is very low. Serial beta-hCG titer is the most accurate method for detection of persistent gestational trophoblastic disease (GTN). In neglected cases like this case preservation of ruptured uterus in GTN is possible.

Pourali L; Ayati S; Vahidroodsari F; Taghizadeh A; Sadat Hosseini R

2013-01-01

203

Dynamics and rheology of high molar mass polyethylene oxide solutions  

Science.gov (United States)

We report dynamic light scattering (DLS), bulk rheology and turbulent drag reduction (TDR) measurements that investigate the structure and dynamics of high molar mass PEO solutions. Steady shear rheology of high molar mass PEO solutions, when modeled by the FENE-P constitutive equation, was consistent with viscoelastic relaxation times much larger than predicted by single polymer, dilute solution theory. DLS of dilute PEO solutions showed a single relaxation mode in the decay time distribution, which scales as q-3 rather than the q-2 scaling expected of diffusive dynamics. We interpret this result as consistent with the internal dynamics of large multichain domains, clusters or aggregates in the high molar mass PEO solutions. By means of DLS, we also show that the aggregation state of dilute solutions of high molar mass PEO can be manipulated by addition of the chaotropic salt guanidine sulfate or the divalent salt magnesium sulfate. Addition of these salts shifts the power law scaling of the relaxation time from q-3 to q-2. This shift of relaxation time scaling from one indicative of aggregate dynamics (q-3) to one characteristic of polymer center-of-mass diffusion (q-2) shows that these salts are effective de-aggregation agents for PEO. We discuss the results in light of the potential connection between aggregation behavior and polymer TDR of high molar mass PEO.

Shetty, Abhishek; Solomon, Michael

2009-03-01

204

Retroperitoneal arteriovenous malformation extending through the inferior vena cava into the heart and causing inferior vena cava dissection  

Energy Technology Data Exchange (ETDEWEB)

We present a case of retroperitoneal arteriovenous malformation extending through the inferior vena cava into the heart, which was associated with dissection of the inferior vena cava in a 32-year-old female. Computed tomography and magnetic resonance imaging showed a double-lumen inferior vena cava and a rod-like solid component attached to a sac-like lesion in the right heart chambers. Digital subtraction angiography showed an arteriovenous malformation draining to the inner lumen of the inferior vena cava. (orig.)

Sung, Yon Mi [Sungkyunkwan University School of Medicine, Department of Radiology and Center for Imaging Science, Seoul (Korea); Choe, Yeon Hyeon [Sungkyunkwan University School of Medicine, Department of Radiology and Center for Imaging Science, Seoul (Korea); Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul (Korea); Park, Seung Woo [Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul (Korea); Sungkyunkwan University School of Medicine, Department of Internal Medicine, Division of Cardiology, Seoul (Korea); Park, Pyo Won [Sungkyunkwan University School of Medicine, Cardiac and Vascular Center, Samsung Medical Center, Seoul (Korea); Sungkyunkwan University School of Medicine, Department of Thoracic and Cardiovascular Surgery, Seoul (Korea); Sung, Chang Ohk [Sungkyunkwan University School of Medicine, Department of Pathology, Seoul (Korea)

2005-06-01

205

Effects of Gates-Glidden, LA Axxess and orifice shaper burs on the cervical dentin thickness and root canal area of mandibular molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Este estudo avaliou o aumento da área do canal e a espessura de dentina na parede mesial e distal dos canais mesiais de molares inferiores após o uso de Gates Glidden (GG), La Axxess (LA), Orifice Shaper (OS). Um total de 53 canais mesiais de 27 molares inferiores foram incluídos em resina e divididos em 3 grupos. As raízes foram seccionados 3 mm abaixo da junção cemento-esmalte e as imagens foram capturadas antes e depois da instrumentação. O aumento da área do (more) canal em percentagem e a espessura da dentina remanescente nas paredes mesial e furca foram calculados utilizando o software Image Tools. Os dados foram analisados utilizando o Kruskal-Wallis e teste de Dunn. O Nível de significância foi de 5%. Todos os instrumentos promoveram o aumento da área cervical, com diferentes quantidades de remoção da dentina nas paredes mesial e distal do canal radicular. Diferença estatística (p Abstract in english This study evaluated the increase of the instrumented area and dentin thickness in the mesial and distal aspects of mesial canals of mandibular molars after the use of Gates Glidden (GG), LA Axxess (LA) and Orifice Shaper (OS) instruments. A total of 53 canals from 27 mandibular molars were embedded in resin and divided into 3 groups. The roots were sectioned 3 mm below the cementoenamel junction and the images were captured before and after instrumentation. The increase (more) of the instrumented area in terms of percentages and the remaining dentin thickness, in mm, at the mesial and furcal aspects were calculated using the Image tools software. Data were analyzed using the Kruskal-Wallis and Dunn's test. The significance level was set at 5%. All instruments promoted cervical flaring with different amounts of dentin removal at the mesial and distal aspects of the root canals. Statistically significant difference (p

Duarte, Marco Antonio Hungaro; Bernardes, Ricardo Affonso; Ordinola-Zapata, Ronald; Vasconcelos, Bruno Carvalho de; Bramante, Clovis Monteiro; Moraes, Ivaldo Gomes de

2011-01-01

206

First permanent molar root development arrest associated with compound odontoma.  

UK PubMed Central (United Kingdom)

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.

Gunda SA; Patil A; Varekar A

2013-01-01

207

Tenoxicam for pain relief following third molar surgery.  

UK PubMed Central (United Kingdom)

Tenoxicam is a long-acting nonsteroidal anti-inflammatory agent that appears to have the ability to control pain of musculoskeletal origin. A double-blind randomized crossover study was designed to determine the efficacy of tenoxicam for pain relief following third molar surgery by comparing it with paracetamol. Immediately before surgery, 30 Chinese patients with bilateral symmetrically impacted mandibular third molars were given 40 mg of tenoxicam for surgery on one side and 1,000 mg of paracetamol for surgery on the other. Both paracetamol and tenoxicam were efficient as pain relievers after third molar surgery. Tenoxicam had comparable efficacy to paracetamol, but did not provide any advantage in terms of duration of action. The discrepancy between the clinical observation and pharmacokinetic prediction may be related to the strong serum binding property of tenoxicam.

Cheung LK; Rodrigo C

1992-01-01

208

Aberration in the palatal root of the maxillary first molar.  

UK PubMed Central (United Kingdom)

Thorough knowledge of root canal morphology is essential for the endodontic therapy. Variations in the root and root canal morphology, especially in multirooted teeth, are a constant challenge for diagnosis and management. The dentist needs to be familiar with the various root canal configurations and their variations for successful endodontic therapy. There are rare variations in canal number and configuration in maxillary molars, which could affect treatment outcome. Two lingual root structures are occasionally found on human permanent maxillary molars. One of these is the normal lingual root, which is always present, the other is a supernumerary structure which can be located either mesiolingually (radix mesiolingualis) or distolingually (radix distolingualis). The purpose of this paper is to review the literature and to demonstrate a case report which describes the successful non-surgical endodontic management of an unusual maxillary first molar with four separate roots and four canals.

Rajalbandi S; Shingte SN; Sundaresh KJ; Mallikarjuna R

2013-01-01

209

Aberration in the palatal root of the maxillary first molar.  

Science.gov (United States)

Thorough knowledge of root canal morphology is essential for the endodontic therapy. Variations in the root and root canal morphology, especially in multirooted teeth, are a constant challenge for diagnosis and management. The dentist needs to be familiar with the various root canal configurations and their variations for successful endodontic therapy. There are rare variations in canal number and configuration in maxillary molars, which could affect treatment outcome. Two lingual root structures are occasionally found on human permanent maxillary molars. One of these is the normal lingual root, which is always present, the other is a supernumerary structure which can be located either mesiolingually (radix mesiolingualis) or distolingually (radix distolingualis). The purpose of this paper is to review the literature and to demonstrate a case report which describes the successful non-surgical endodontic management of an unusual maxillary first molar with four separate roots and four canals. PMID:23632609

Rajalbandi, Sandeep; Shingte, Sandhya Narayan; Sundaresh, K J; Mallikarjuna, Rachappa

2013-04-30

210

Anxiety and extraction of third molars in Turkish patients.  

UK PubMed Central (United Kingdom)

Preoperative anxiety is widespread and adversely affects a patient's physical and psychological outcome. Extraction of third molars is common, and many patients complain of anxiety and emotional disturbance. We assessed the anxiety of patients in Turkey before extraction of third molars. A total of 120 patients were admitted for removal of one or more third molars under local anaesthesia. The Amsterdam Preoperative Anxiety and Information Scale (APAIS) and Spielberger's State Trait Anxiety Inventory (STAI) were used to evaluate anxiety. The results showed that women were significantly more anxious than men; women who had not had a previous operation were more anxious than other women; there was no difference in the anxiety scores of patients who had previously had a local anaesthetic and those who had not; there were no differences in anxiety as measured by trait scores; patients who wanted a lot of information were more anxious.

Garip H; Abali O; Göker K; Göktürk U; Garip Y

2004-12-01

211

Anxiety and extraction of third molars in Turkish patients.  

Science.gov (United States)

Preoperative anxiety is widespread and adversely affects a patient's physical and psychological outcome. Extraction of third molars is common, and many patients complain of anxiety and emotional disturbance. We assessed the anxiety of patients in Turkey before extraction of third molars. A total of 120 patients were admitted for removal of one or more third molars under local anaesthesia. The Amsterdam Preoperative Anxiety and Information Scale (APAIS) and Spielberger's State Trait Anxiety Inventory (STAI) were used to evaluate anxiety. The results showed that women were significantly more anxious than men; women who had not had a previous operation were more anxious than other women; there was no difference in the anxiety scores of patients who had previously had a local anaesthetic and those who had not; there were no differences in anxiety as measured by trait scores; patients who wanted a lot of information were more anxious. PMID:15544887

Garip, Hasan; Abali, Osman; Göker, Kamil; Göktürk, Ulkü; Garip, Yildiz

2004-12-01

212

Intravenous Uterine Leiomyomatosis with Inferior Vena Cava and Intracardiac Extensions  

International Nuclear Information System (INIS)

Intravenous leiomyomatosis originating from the uterus and involving the right ventricle, right atrium, inferior vena cava and iliac veins is an uncommon disease. We report here on a leiomyomatosis in a 35-year-old woman who presented with tumors in her heart and inferior vena cava. The correct diagnosis was achieved by using the transthoracic echocardiographic, cardiac CT and pelvic MRI findings

2009-01-01

213

Arteriovenous hemangioma formation following radiofrequency ablation for inferior turbinate reduction.  

Science.gov (United States)

Inferior turbinate reduction by radiofrequency ablation (RFA) has been recommended as an easy and safe option for the treatment of patients with inferior turbinate hypertrophy. Complications of this type of excision are generally acceptable. We describe a case of RFA turbinate reduction that resulted in an unusual complication: the formation of an arteriovenous hemangioma. PMID:22033964

Polat, Senol; Tanyeri, Hasan Murat; Bilgi, Selcuk

2011-10-01

214

Arteriovenous hemangioma formation following radiofrequency ablation for inferior turbinate reduction.  

UK PubMed Central (United Kingdom)

Inferior turbinate reduction by radiofrequency ablation (RFA) has been recommended as an easy and safe option for the treatment of patients with inferior turbinate hypertrophy. Complications of this type of excision are generally acceptable. We describe a case of RFA turbinate reduction that resulted in an unusual complication: the formation of an arteriovenous hemangioma.

Polat S; Tanyeri HM; Bilgi S

2011-10-01

215

[Inferior vena cava filters: any indications anymore?].  

UK PubMed Central (United Kingdom)

Inferior vena cava filters (IVCFs) are metal alloy devices that mechanically trap fragmented thromboemboli from the deep leg veins en route to the pulmonary circulation. Filters are introduced (and in the case of retrievable filters, removed) percutaneously. Although their deployment seems of theoretical benefit, their clinical efficacy and adverse event profile are unclear because there are very few controlled and randomized data. IVCFs are most frequently used in patients with contraindications to anticoagulation and in anticoagulated patients with recurrent pulmonary embolism, but few data are available in the literature about their efficacy. The indications for filters are based largely on custom, historical practice patterns and physician preferences, and their use is increasing: more trials are needed to confirm their benefit and accurately assess their safety. The care of patients with or at risk of venous thromboembolism is as variable and challenging as the range of patients who suffer from venous thrombosis. Careful, individualized decision regarding IVCF placement will be required for many years as we strive to learn more about these devices.

Santoro G; Innocenti D; Meucci F; Squillantini G; Agostini C; Rosso G

2011-09-01

216

Inferior vena cava filters: indications and management.  

UK PubMed Central (United Kingdom)

PURPOSE OF REVIEW: The purpose of this review was to examine recent studies concerning the use of inferior vena cava (IVC) filters. RECENT FINDINGS: In the past 18 months, the American College of Chest Physicians released the 9th edition of their guideline for the prevention and treatment of venous thromboembolism. There have also been a number of studies reviewing the use of IVC filters in select populations for the prophylactic prevention of pulmonary embolism. Trauma continues to be the leading indication for prophylactic filters in a number of series, but further studies have demonstrated some benefit of prophylactic filters in the bariatric and spine surgery populations. The IVC filter complication rate remains low; however, so does the retrieval rate for potentially removable filters. These retrieval rates are increased with use of dedicated patient tracking mechanisms. Finally, there have been a number of technology updates in the hardware itself, focusing on strut design. SUMMARY: Despite little change in the society guidelines, the use of vena cava filters (VCFs) continues to rise. Overall, the use of IVC filters, especially in prophylactic situations, will remain controversial until randomized, controlled trials are performed within each specific patient population.

Sing RF; Fischer PE

2013-11-01

217

MR venography of the inferior mesentery vein  

International Nuclear Information System (INIS)

Objective: To evaluate on three-dimensional (3D) dynamic contrast-enhanced (DCE) MR venography (MRV), the visibility of the inferior mesenteric vein (IMV), its insertion pattern into the portal system, and the difference of IMV diameters between healthy subjects and patients with cirrhosis. Materials and methods: Two hundred and seventeen consecutive patients who had abdominal 3D DCE MRI was included in this study. The original image data of 3D DCE MRI was used to generate multiple planar volume reconstruction (MPVR) images, which were evaluated for visualization of the IMV and its pattern of insertion into the portal system. The diameter of IMV was measured and compared in 24 patients with cirrhosis (Cirrhosis Group) and in 30 patients without hepatic lesions or liver disease (Healthy Group). Results: In the 217 patients, the frequencies of visualization of IMV, grade 1 order branches and grade 2 order branches were, respectively, 88%, 24% and 9%. The IMV inserted into the splenic vein (SV), the portal confluence and the superior mesenteric vein (SMV) in 45%, 18% and 37%, respectively. Among patients with cirrhosis, 12.5% had IMV diameter larger than 5.1 mm, although there was no significant difference between cirrhosis and healthy groups (P > 0.05). However, the diameters of the main portal vein (MPV), SV and SMV were significantly larger in the Cirrhosis Group (P

2007-01-01

218

Surveillance without chemotherapy in a woman with recurrent molar pregnancy.  

Science.gov (United States)

A 27-year-old fouth gravida patient with previous two partial molar pregnancies and one missed abortion underwent a suction evacuation for partial molar pregnancy at 9 weeks of gestation. She was followed up with serum HCG values. Though the HCG level reduced from a pre-evacuation value of 1 40 223-31 157 mIU/ml 1 week post procedure, the levels continued to be positive in low titres 6 months after suction evacuation. The management options were discussed with the patient and a decision was taken to continue surveillance with serial HCG titres. HCG levels normalised after 11 months without the need for chemotherapy. PMID:23429019

Bagga, Rashmi; Siwatch, Sujata; Srinivasan, Radhika; Dhaliwal, Lakhbir Kaur

2013-02-20

219

Dilated odontome in the mandibular third molar region.  

UK PubMed Central (United Kingdom)

The dilated odontome is the most severe form of the dens invaginatus (dens in dente), which is extremely rare in the mandible, especially in the molar region. A case is reported in a 28-year-old female with an unusual ringlike radiopaque appearance of the mandibular third right molar on panoramic x-ray. CT scan findings were suggestive that the intraosseous circular radiopaque formation was a dilated odontome. The alveotomy of the "tooth" was performed, and histopathological analysis of the inner and surrounding soft tissue revealed a diagnosis consistent with a dilated odontome.

Cukovi?-Bagi? I; Macan D; Dumanci? J; Manojlovi? S; Hat J

2010-02-01

220

Correlations between elastic moduli and molar volume in metallic glasses  

International Nuclear Information System (INIS)

We report clear correlations between bulk modulus (K) and average molar volume Vm, and between Poisson's ratio ? and Vm for various bulk metallic glasses. The origin for the correlations between elastic moduli and Vm are discussed. The established correlation, associated with Poisson's ratio ?, and since the ? correlates with plasticity of metallic glasses, indicates that the average molar volume is important factor to be considered for plastic metallic glasses searching. The found correlations also suggest a close relation between the mechanical properties and the short-range atomic bonding, and assist in understanding deformation behavior in metallic glasses.

2009-03-23

 
 
 
 
221

Miniscrew-supported coil spring for molar uprighting: description.  

UK PubMed Central (United Kingdom)

INTRODUCTION: Since the beginning of miniscrews as orthodontic anchorage, many applications have been described in the literature. Among these, one is the uprighting of mesially inclined molars. In regard to the mechanical aspects, however, there is little information about the application of orthodontic forces using such devices. OBJECTIVE: The objective of this study was to describe a miniscrew supported spring for uprighting of mesially inclined molars. With this device, one can achieve the correct use of orthodontic biomechanics, thus favoring more predictable tooth movements and preventing unwanted movements from occurring.

Ruellas AC; Pithon MM; dos Santos RL

2013-01-01

222

Paramolar - A supernumerary molar: A case report and an overview  

Science.gov (United States)

Paramolar is a supernumerary molar usually small and rudimentary, most commonly situated buccally or palatally to one of the maxillary molars. Paramolar is a developmental anomaly and has been argued to arise from a combination of genetic and environmental factors. Reports of this entity are rarely found in the dental literature. This article presents a case report of an unusual occurrence of a paramolar in the maxilla in otherwise a healthy individual. In addition, literature review, prevalence, classification, etiology, complications, diagnosis, and therapeutic strategies that may be adopted when supernumeraries occurs have been discussed.

Nayak, Gurudutt; Shetty, Shashit; Singh, Inderpreet; Pitalia, Deepti

2012-01-01

223

Unilateral Recession-Resection Surgery with Inferior Displacement Combined with Augmented Anterior Transposition of Inferior Oblique Muscle  

Digital Repository Infrastructure Vision for European Research (DRIVER)

We report the effects of unilateral recession-resection surgery of the horizontal recti muscles with inferior displacement and augmented anterior transposition of the inferior oblique muscle with a posterior intermuscular suture in a patient with large exotropia and considerable hypertropia.

Hong, Samin; Hong, Young Taek; Seong, Gong Je; Han, Sueng-Han

224

Unilateral Recession-Resection Surgery with Inferior Displacement Combined with Augmented Anterior Transposition of Inferior Oblique Muscle  

Science.gov (United States)

We report the effects of unilateral recession-resection surgery of the horizontal recti muscles with inferior displacement and augmented anterior transposition of the inferior oblique muscle with a posterior intermuscular suture in a patient with large exotropia and considerable hypertropia.

Hong, Samin; Hong, Young Taek; Seong, Gong Je

2010-01-01

225

Procedures to recover DNA from pre-molar and molar teeth of decomposed cadavers with different post-mortem intervals.  

UK PubMed Central (United Kingdom)

A task-force to resolve 26 pending forensic caseworks was carried out. We tested four different protocols to extract DNA from molar and pre-molar teeth from 26 cadavers with post-mortem intervals from 2 months to 12 years. We compared the amount of DNA and DNA profiles with the time elapsed between death and laboratory procedures. Molar or pre-molar teeth were removed from the corpses, cleaned, and DNA was extracted using 2 or 12h of incubation on lysis buffer and filtered using concentration column or precipitated with isopropanol. DNA profiles were obtained using PowerPlex16™ System PCR Amplification Kit, AmpFlSTR(®) Yfiler™ and/or mtDNA sequencing. Complete DNA profiles comparison and statistical evaluation allowed unambiguous identification of the 26 victims. No significant differences were observed in the amount of DNA obtained with the distinct incubation times. The use of concentration column resulted in an increased amount of DNA when compared to isopropanol. However, the lower concentration of DNA obtained with isopropanol seemed to have been compensated by the higher purity. No significant differences in the number of amplified loci were found. A non-significant tendency was found between the amount of total DNA recovered and the time elapsed between death and laboratory procedures. The increase of post-mortem time did not interfere in the analysed autosomal loci. In conclusion, molar and pre-molar teeth were shown to be good candidates to obtain satisfactory DNA profiles, suggesting the high potential of tooth samples as source for DNA typing independently of the decomposed corpse's time or laboratory procedures.

Raimann PE; Picanço JB; Silva DS; Albuquerque TC; Paludo FJ; Alho CS

2012-11-01

226

Procedures to recover DNA from pre-molar and molar teeth of decomposed cadavers with different post-mortem intervals.  

Science.gov (United States)

A task-force to resolve 26 pending forensic caseworks was carried out. We tested four different protocols to extract DNA from molar and pre-molar teeth from 26 cadavers with post-mortem intervals from 2 months to 12 years. We compared the amount of DNA and DNA profiles with the time elapsed between death and laboratory procedures. Molar or pre-molar teeth were removed from the corpses, cleaned, and DNA was extracted using 2 or 12h of incubation on lysis buffer and filtered using concentration column or precipitated with isopropanol. DNA profiles were obtained using PowerPlex16™ System PCR Amplification Kit, AmpFlSTR(®) Yfiler™ and/or mtDNA sequencing. Complete DNA profiles comparison and statistical evaluation allowed unambiguous identification of the 26 victims. No significant differences were observed in the amount of DNA obtained with the distinct incubation times. The use of concentration column resulted in an increased amount of DNA when compared to isopropanol. However, the lower concentration of DNA obtained with isopropanol seemed to have been compensated by the higher purity. No significant differences in the number of amplified loci were found. A non-significant tendency was found between the amount of total DNA recovered and the time elapsed between death and laboratory procedures. The increase of post-mortem time did not interfere in the analysed autosomal loci. In conclusion, molar and pre-molar teeth were shown to be good candidates to obtain satisfactory DNA profiles, suggesting the high potential of tooth samples as source for DNA typing independently of the decomposed corpse's time or laboratory procedures. PMID:23040740

Raimann, Paulo E; Picanço, Juliane B; Silva, Deborah S B S; Albuquerque, Trícia C K; Paludo, Francis Jackson O; Alho, Clarice S

2012-10-04

227

Agenesia de veia cava inferior associada à trombose venosa profunda Agenesis of inferior vena cava associated with deep venous thrombosis  

Directory of Open Access Journals (Sweden)

Full Text Available A agenesia da veia cava inferior é uma anomalia congênita rara, que foi recentemente identificada como um importante fator de risco para o desenvolvimento e a recorrência de trombose venosa profunda de membros inferiores em jovens. O objetivo deste trabalho foi relatar o caso de uma paciente que apresentou trombose venosa profunda dois meses após a realização de cirurgia de varizes. A angiotomografia computadorizada demonstrou a presença de anomalia venosa complexa com ausência da veia cava inferior.The agenesis of the inferior vena cava is a rare congenital anomaly, which was recently identified as an important risk factor for the development and recurrence of deep venous thrombosis especially in young people. The goal of this work was to report the case of a patient who presented deep venous thrombosis approximately two months after varicose vein surgery. The computerized angiotomography demonstrated the presence of a complex venous anomaly with absence of the inferior vena cava.

Clovis Luis Konopka; Marcelo Salame; Geórgia Andrade Padulla; Raquel Rodrigues Muradás; Julio César Batistella

2010-01-01

228

Cateterização dos seios petrosos inferiores: aspectos técnicos/ Inferior petrosal sinus catheterization: technical aspects  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: O cateterismo dos seios petrosos inferiores (SPI) ajuda a diferenciar as formas hipofisária e ectópica na síndrome de Cushing (SC). O objetivo desse trabalho é descrever a técnica empregada em nosso serviço, discutir a solução de dificuldades e verificar o índice de sucesso atingido. CASUÍSTICA E MÉTODO: Foram submetidos a cateterismo bilateral dos SPI 42 pacientes com SC, entre setembro de 2000 e setembro de 2005. As dificuldades para o posicionament (more) o do cateter foram correlacionadas com as soluções empregadas. RESULTADOS: As variações anatômicas, a semelhança entre o SPI e a veia emissária do plexo basilar e a dificuldade de contrastar as estruturas a contrafluxo para localizá-las foram os principais problemas. Foram utilizados cateter pré-moldado, fio-guia semicurvo e dirigível, road-maping e venografia por injeção contralateral, além de critérios para diferenciar o SPI da veia emissária. Dos 84 SPI abordados, um apresentava trombose, e dos 83 possíveis, 80 (96,4%) foram cateterizados. Não se observaram complicações. CONCLUSÃO: A cateterização dos SPI pode ser feita na maioria dos pacientes. A identificação da veia emissária do plexo basilar e o uso de flebografia por injeção contralateral melhoraram o desempenho do método. Abstract in english PURPOSE: Inferior petrosal sinus catheterization and sampling for corticotropin dosage helps to differentiate hypophisary and ectopic forms of Cushing syndrome. The aim of this paper is to describe the technique used in inferior petrosal sinus catheterization in our service, emphasizing the solution found for frequent difficulties, and verify the success rate achieved. PATIENTS AND METHODS: Between September/2000 and September/2005, forty-two (eighty-four sinuses) patient (more) s were submitted to inferior petrosal sinus sampling. The difficulties for correct catheter positioning were identified and correlated with their solutions. RESULTS: Anatomical variations, similarity between IPS and emissary vein of the basilar plexus and unfavorable flow to the contrastation of the structures (retrograde catheterization) were the main problems. Using pre-shaped catheters, curved, steerable guide-wires, road-maping and venography by contalateral injection, besides criteria to differentiate IPS from the emissary vein. Of the 84 sinuses approached, one was thrombosed, and 80 (96.4%) of 83 possible were selectively catheterized. No clinical complication occurred. CONCLUSION: IPSC can be safe and successfully performed in most cases. The identification of the emissary vein of the basilar plexus and use of venography by contralateral injection, improved the method performance.

Puglia Jr., Paulo; Caldas, José G. M. P.; Barbosa, Leandro A.; Sá Jr., Antenor T.; Machado, Márcio C.; Salgado, Luis R.

2008-06-01

229

Cateterização dos seios petrosos inferiores: aspectos técnicos Inferior petrosal sinus catheterization: technical aspects  

Directory of Open Access Journals (Sweden)

Full Text Available OBJETIVO: O cateterismo dos seios petrosos inferiores (SPI) ajuda a diferenciar as formas hipofisária e ectópica na síndrome de Cushing (SC). O objetivo desse trabalho é descrever a técnica empregada em nosso serviço, discutir a solução de dificuldades e verificar o índice de sucesso atingido. CASUÍSTICA E MÉTODO: Foram submetidos a cateterismo bilateral dos SPI 42 pacientes com SC, entre setembro de 2000 e setembro de 2005. As dificuldades para o posicionamento do cateter foram correlacionadas com as soluções empregadas. RESULTADOS: As variações anatômicas, a semelhança entre o SPI e a veia emissária do plexo basilar e a dificuldade de contrastar as estruturas a contrafluxo para localizá-las foram os principais problemas. Foram utilizados cateter pré-moldado, fio-guia semicurvo e dirigível, road-maping e venografia por injeção contralateral, além de critérios para diferenciar o SPI da veia emissária. Dos 84 SPI abordados, um apresentava trombose, e dos 83 possíveis, 80 (96,4%) foram cateterizados. Não se observaram complicações. CONCLUSÃO: A cateterização dos SPI pode ser feita na maioria dos pacientes. A identificação da veia emissária do plexo basilar e o uso de flebografia por injeção contralateral melhoraram o desempenho do método.PURPOSE: Inferior petrosal sinus catheterization and sampling for corticotropin dosage helps to differentiate hypophisary and ectopic forms of Cushing syndrome. The aim of this paper is to describe the technique used in inferior petrosal sinus catheterization in our service, emphasizing the solution found for frequent difficulties, and verify the success rate achieved. PATIENTS AND METHODS: Between September/2000 and September/2005, forty-two (eighty-four sinuses) patients were submitted to inferior petrosal sinus sampling. The difficulties for correct catheter positioning were identified and correlated with their solutions. RESULTS: Anatomical variations, similarity between IPS and emissary vein of the basilar plexus and unfavorable flow to the contrastation of the structures (retrograde catheterization) were the main problems. Using pre-shaped catheters, curved, steerable guide-wires, road-maping and venography by contalateral injection, besides criteria to differentiate IPS from the emissary vein. Of the 84 sinuses approached, one was thrombosed, and 80 (96.4%) of 83 possible were selectively catheterized. No clinical complication occurred. CONCLUSION: IPSC can be safe and successfully performed in most cases. The identification of the emissary vein of the basilar plexus and use of venography by contralateral injection, improved the method performance.

Paulo Puglia Jr.; José G. M. P. Caldas; Leandro A. Barbosa; Antenor T. Sá Jr.; Márcio C. Machado; Luis R. Salgado

2008-01-01

230

MR venography of the inferior mesentery vein  

Energy Technology Data Exchange (ETDEWEB)

Objective: To evaluate on three-dimensional (3D) dynamic contrast-enhanced (DCE) MR venography (MRV), the visibility of the inferior mesenteric vein (IMV), its insertion pattern into the portal system, and the difference of IMV diameters between healthy subjects and patients with cirrhosis. Materials and methods: Two hundred and seventeen consecutive patients who had abdominal 3D DCE MRI was included in this study. The original image data of 3D DCE MRI was used to generate multiple planar volume reconstruction (MPVR) images, which were evaluated for visualization of the IMV and its pattern of insertion into the portal system. The diameter of IMV was measured and compared in 24 patients with cirrhosis (Cirrhosis Group) and in 30 patients without hepatic lesions or liver disease (Healthy Group). Results: In the 217 patients, the frequencies of visualization of IMV, grade 1 order branches and grade 2 order branches were, respectively, 88%, 24% and 9%. The IMV inserted into the splenic vein (SV), the portal confluence and the superior mesenteric vein (SMV) in 45%, 18% and 37%, respectively. Among patients with cirrhosis, 12.5% had IMV diameter larger than 5.1 mm, although there was no significant difference between cirrhosis and healthy groups (P > 0.05). However, the diameters of the main portal vein (MPV), SV and SMV were significantly larger in the Cirrhosis Group (P < 0.05). Conclusion: The IMV and its branches can be depicted well by 3D DCE MRV. The most common insertion of the IMV is into the splenic vein. A minority of patients with cirrhosis had dilatation of the IMV.

Zhang Xiaoming [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: zhangxm@nsmc.edu.cn; Zhong Tangli [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: zhongtls@163.com; Zhai Zhaohua [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: zhaizhaohuada@163.com; Zeng Nanlin [Department of Radiology, Affiliated Hospital of North Sichuan Medical College, Wenhua Road 63, Nanchong, Sichuan 637000 (China)], E-mail: znl99@163.com

2007-10-15

231

The MOLAR Project: atmospheric deposition and lake water chemistry  

Digital Repository Infrastructure Vision for European Research (DRIVER)

In the framework of the Mountain Lake Research (MOLAR) project, the water chemistry of 23 lakes covering Europe from the Svalbard Islands to the South of Spain were studied. The lakes are located above or beyond the timber line in the most important mountain areas in Europe. Atmospheric deposition w...

The MOLAR Water Chemistry Group

232

Patent Accessory Canals: Incidence in Molar Furcation Region.  

Science.gov (United States)

A total of 46 extracted maxillary and mandibular molars were examined to determine the incidence of accessory canals in the coronal and middle third of the root surface. A radiopaque dye was drawn through the root canal system under a vacuum of 5 p.s.i., ...

J. V. Lowman R. S. Burke G. B. Pelleu

1974-01-01

233

Mathematical analysis of furcation angle in extracted mandibular molars.  

UK PubMed Central (United Kingdom)

BACKGROUND: Multi-rooted teeth with furcation involvement exhibit a poorer prognosis when compared to single rooted teeth. The furcation angle (formed by the divergent roots and the roof) may exert a considerable influence on the accessibility for both home care maintenance and instrumentation during periodontal therapy. As there are few anatomy based reports, the furcation angle has not yet been delineated. MATERIALS AND METHODS: Furcation angle (FA) was mathematically evaluated in extracted mandibular first and second molar teeth, using the Computer-aided design - computer-aided manufacturing technology. RESULTS: THE FURCATIONS WERE DIVIDED INTO THREE GROUPS (GROUP I: <30°, Group II: 30°-60°, Group III: >60°) based on the furcation angle and their prevalence. The first molar showed greater prevalence of group II FA, while second molar showed a greater prevalence of group III FA. CONCLUSION: Linear, two dimensional measurements may not accurately reflect the complexities of the furcation area which exhibits considerable intermolar and intramolar (buccal and lingual furcations of second molar) variation.

James JR; Arun KV; Talwar A; Kumar TS

2013-01-01

234

Miniscrew-supported coil spring for molar uprighting: description  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese INTRODUÇÃO: desde o surgimento dos mini-implantes como recurso de ancoragem ortodôntica, muitas aplicações têm sido descritas na literatura. Entre essas, cita-se a verticalização de molares inclinados para mesial. No entanto, pouco se fala da correta aplicação das forças ortodônticas nesses dispositivos, sob o ponto de vista mecânico. OBJETIVOS: o objetivo desse artigo foi demonstrar uma mola mini-implante suportada para verticalizar molares inclinados para m (more) esial. Com esse dispositivo consegue-se correta aplicação da mecânica ortodôntica, favorecendo movimentos mais previsíveis e minimizando os movimentos indesejáveis. Abstract in english INTRODUCTION: Since the beginning of miniscrews as orthodontic anchorage, many applications have been described in the literature. Among these, one is the uprighting of mesially inclined molars. In regard to the mechanical aspects, however, there is little information about the application of orthodontic forces using such devices. OBJECTIVE: The objective of this study was to describe a miniscrew supported spring for uprighting of mesially inclined molars. With this devic (more) e, one can achieve the correct use of orthodontic biomechanics, thus favoring more predictable tooth movements and preventing unwanted movements from occurring.

Ruellas, Antônio Carlos de Oliveira; Pithon, Matheus Melo; Santos, Rogério Lacerda dos

2013-02-01

235

Standard molar enthalpies of formation of 1- and 2-cyanonaphthalene  

Energy Technology Data Exchange (ETDEWEB)

Highlights: > Enthalpies of formation of 1- and 2-cyanonaphthalene were measured by combustion calorimetry. > Vapor pressures of crystalline 1- and 2-cyanonaphthalene obtained by Knudsen effusion mass loss technique. > Enthalpies, entropies and Gibbs functions of sublimation at T = 298.15 K were calculated. - Abstract: The standard (p{sup o} = 0.1 MPa) molar enthalpies of formation, in the crystalline state, of the 1- and 2-cyanonaphthalene were derived from the standard molar energies of combustion, in oxygen, at T = 298.15 K, measured by static-bomb combustion calorimetry. Vapor pressure measurements at different temperatures, using the Knudsen mass loss effusion technique, enabled the determination of the enthalpy, entropy, and Gibbs energy of sublimation, at T = 298.15 K, for both isomers. The standard molar enthalpies of sublimation, at T = 298.15 K, for 1- and 2-cyanonaphthalene, were also measured by high-temperature Calvet microcalorimetry. (table) Combining these two experimental values, the gas-phase standard molar enthalpies, at T = 298.15 K, were derived and compared with those estimated by employing two different methodologies: one based on the Cox scheme and the other one based on G3MP2B3 calculations. The calculated values show a good agreement with the experimental values obtained in this work.

Ribeiro da Silva, Manuel A.V., E-mail: risilva@fc.up.pt [Centro de Investigacao em Quimica, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto (Portugal); Lobo Ferreira, Ana I.M.C.; Barros, Ana L.M.; Bessa, Ana R.C.; Brito, Barbara C.S.A.; Vieira, Joana A.S.; Martins, Silvia A.P. [Centro de Investigacao em Quimica, Department of Chemistry and Biochemistry, Faculty of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto (Portugal)

2011-09-15

236

Preparation of tritiated aniline of high molar activity  

International Nuclear Information System (INIS)

Synthesis technique of aniline, tritiated by aminogroup and ortho- and para-pisition of aromatic ring without carrier is proposed. The technique is based on azobenzene reduction splitting by gaseous tritium on palladium catalyser under, static conditions. The molar activity of aniline produced makes up 10.4x1014 Bq/mol.

1989-01-01

237

Unilateral maxillary molar distalization with zygoma-gear appliance.  

UK PubMed Central (United Kingdom)

The aim of this study was to present the orthodontic treatment of a 15-year-old boy with a unilateral maxillary molar distalization system, called the zygoma-gear appliance. It consisted of a zygomatic anchorage miniplate, an inner bow, and a Sentalloy closed coil spring (GAC International, Bohemia, NY). A distalizing force of 350 g was used during the distalization period. The unilateral Class II malocclusion was corrected in 5 months with the zygoma-gear appliance. The maxillary left first molar showed distalization of 4 mm with an inclination of 3°. The maxillary premolars moved distally with the help of the transseptal fibers. In addition, there were slight decreases in overjet (-0.5 mm) and maxillary incisor inclination (-1°), indicating no anchorage loss from the zygoma-gear appliance. Preadjusted fixed appliances (0.022 × 0.028-in, MBT system; 3M Unitek, Monrovia, Calif) were placed in both arches to achieve leveling and alignment. After 14 months of unilateral distalization with the zygoma-gear appliance and fixed appliances, Class I molar and canine relationships were established with satisfactory interdigitation of the posterior teeth. Acceptable overjet and overbite were also achieved. This article shows that this new system, the zygoma-gear appliance, can be used for unilateral maxillary molar distalization without anchorage loss.

Kilkis D; Bayram M; Celikoglu M; Nur M

2012-08-01

238

Inflammatory root resorption in primary molars: prevalence and associated factors.  

UK PubMed Central (United Kingdom)

This study aimed at determining the prevalence of inflammatory root resorption and associated factors in 1068 primary mandibular molars in 453 children 3 to 12 years of age. Age, dental history and medical history were recorded using a questionnaire administered to the children's parents/caregivers. Previously trained and calibrated examiners assessed radiographic images of the primary molars by direct observation, with the aid of a viewing box. Root resorption (physiological or inflammatory), dental crown status (healthy, carious with no pulp involvement, carious with pulp involvement and evidence of restoration), and pulpotomy or pulpectomy were determined. Data analysis involved descriptive statistics, the chi-square test and a multiple logistic regression (p < 0.05). The prevalence of inflammatory root resorption was 16.2% (n = 173). The male gender (OR: 1.4; 95% CI), the 3-to-7-years age bracket (OR: 1.5; 95% CI), an unhealthy dental crown (OR: 8.7; 95% CI), caries with pulp involvement (OR: 7.4; 95% CI), pulpotomy (OR: 3.1; 95% CI), and pulpectomy (OR: 5.4; 95% CI) were risk factors for the occurrence of inflammatory root resorption in primary molars. In conclusion, the prevalence of inflammatory root resorption in the present sample was 16.2%. Gender, age, an unhealthy tooth, caries with pulp involvement, pulpotomy, pulpectomy, and the absence of a restoration were associated with a higher occurrence of inflammatory root resorption in primary molars.

Vieira-Andrade RG; Drumond CL; Alves LP; Marques LS; Ramos-Jorge ML

2012-07-01

239

Miniscrew-supported coil spring for molar uprighting: description  

Directory of Open Access Journals (Sweden)

Full Text Available INTRODUCTION: Since the beginning of miniscrews as orthodontic anchorage, many applications have been described in the literature. Among these, one is the uprighting of mesially inclined molars. In regard to the mechanical aspects, however, there is little information about the application of orthodontic forces using such devices. OBJECTIVE: The objective of this study was to describe a miniscrew supported spring for uprighting of mesially inclined molars. With this device, one can achieve the correct use of orthodontic biomechanics, thus favoring more predictable tooth movements and preventing unwanted movements from occurring.INTRODUÇÃO: desde o surgimento dos mini-implantes como recurso de ancoragem ortodôntica, muitas aplicações têm sido descritas na literatura. Entre essas, cita-se a verticalização de molares inclinados para mesial. No entanto, pouco se fala da correta aplicação das forças ortodônticas nesses dispositivos, sob o ponto de vista mecânico. OBJETIVOS: o objetivo desse artigo foi demonstrar uma mola mini-implante suportada para verticalizar molares inclinados para mesial. Com esse dispositivo consegue-se correta aplicação da mecânica ortodôntica, favorecendo movimentos mais previsíveis e minimizando os movimentos indesejáveis.

Antônio Carlos de Oliveira Ruellas; Matheus Melo Pithon; Rogério Lacerda dos Santos

2013-01-01

240

Evaluation of trigeminal nerve injuries in relation to third molar surgery in a prospective patient cohort. Recommendations for prevention.  

UK PubMed Central (United Kingdom)

Trigeminal nerve injury is the most problematic consequence of dental surgical procedures with major medico-legal implications. This study reports the signs and symptoms that are the features of trigeminal nerve injuries caused by mandibular third molar (M3M) surgery. 120 patients with nerve injury following M3M surgery were assessed. All data were analysed using the SPSS statistical programme and Microsoft Excel. 53 (44.2%) inferior alveolar nerve (IAN) injury cases and 67 (55.8%) lingual nerve injury (LNI) cases were caused by third molar surgery (TMS). Neuropathy was demonstrable in all patients with varying degrees of paraesthesia, dysaesthesia (in the form of burning pain), allodynia and hyperalgesia. Pain was one of the presenting signs and symptoms in 70% of all cases. Significantly more females had IAN injuries and LNIs (p<0.05). The mean ages of the two groups of patients were similar. Speech and eating were significantly more problematic for patients with LNIs. In conclusion, chronic pain is often a symptom after TMS-related nerve injury, resulting in significant functional problems. Better dissemination of good practice in TMS will significantly minimize these complex nerve injuries and prevent unnecessary suffering.

Renton T; Yilmaz Z; Gaballah K

2012-12-01

 
 
 
 
241

Evaluation of trigeminal nerve injuries in relation to third molar surgery in a prospective patient cohort. Recommendations for prevention.  

Science.gov (United States)

Trigeminal nerve injury is the most problematic consequence of dental surgical procedures with major medico-legal implications. This study reports the signs and symptoms that are the features of trigeminal nerve injuries caused by mandibular third molar (M3M) surgery. 120 patients with nerve injury following M3M surgery were assessed. All data were analysed using the SPSS statistical programme and Microsoft Excel. 53 (44.2%) inferior alveolar nerve (IAN) injury cases and 67 (55.8%) lingual nerve injury (LNI) cases were caused by third molar surgery (TMS). Neuropathy was demonstrable in all patients with varying degrees of paraesthesia, dysaesthesia (in the form of burning pain), allodynia and hyperalgesia. Pain was one of the presenting signs and symptoms in 70% of all cases. Significantly more females had IAN injuries and LNIs (p<0.05). The mean ages of the two groups of patients were similar. Speech and eating were significantly more problematic for patients with LNIs. In conclusion, chronic pain is often a symptom after TMS-related nerve injury, resulting in significant functional problems. Better dissemination of good practice in TMS will significantly minimize these complex nerve injuries and prevent unnecessary suffering. PMID:23017786

Renton, T; Yilmaz, Z; Gaballah, K

2012-09-25

242

The effect of orally administered ketamine on requirement for anesthetics and postoperative pain in mandibular molar teeth with irreversible pulpitis.  

UK PubMed Central (United Kingdom)

Achieving successful anesthesia and pain control in a predictable, efficient manner is a challenge in the endodontic treatment of vital inflamed lower molars. The aim of this study was to evaluate the effect of oral ketamine on the dosage of local anesthetics required and postoperative pain management for irreversibly inflamed mandibular molars. In this randomized double-blind placebo-controlled clinical trial, 36 patients with irreversibly inflamed mandibular molars were randomly divided into two groups of 18. Ten mg of ketamine dissolved in 20 ml of fruit juice was administered orally to patients in the experimental group. The control group was given 20 ml of fruit juice alone as a placebo. After 30 min, inferior alveolar nerve block (IANB) anesthesia was induced using one cartridge of 2% lidocaine and 1:100000 epinephrine. Teeth were tested after 5 to 10 min using an electrical pulp tester. In patients showing a positive response, another IANB injection was applied, and the total number of anesthetic cartridges used was recorded. Postoperative pain was evaluated using a visual analogue scale (VAS). In addition, use of analgesic in the first 24 h after treatment was monitored using a questionnaire. Data were analyzed by t test using SPSS software. There were no significant differences in age or gender between the two groups. The number of anesthetic cartridges used in the ketamine group was significantly less than that in the control group (P = 0.003). Furthermore, postoperative pain in the ketamine group was significantly lower (P = 0.019). Also the number of analgesic tablets taken in the ketamine group was significantly lower (P = 0.011). It can be concluded that a low dose of ketamine might be beneficial for enhancing the effect of local anesthetics.

Kaviani N; Khademi A; Ebtehaj I; Mohammadi Z

2011-12-01

243

Inferior vena cave filter placement: summary of 96 cases  

International Nuclear Information System (INIS)

Objective: To investigate the effects of filter placement for inferior vena cava in prevention of fatal pulmonary embolism (PE)and the treatment of postoperative complications. Methods: Inferior vena cava filters were placed in 96 patients by the way of femoral vein. Results: All the patients were followed up for 4-36 months after the procedure without fatal pulmonary embolism occurrence in the 96 patients, but with only 17 correlated complications. Conclusion: Inferior vena cava filter placement is easy and safe which can prevent the high complication incidence of fatal pulmonary arterial embolism with further more effective prevention and management of other correlative complications. (authors)

2008-01-01

244

Estudio de volumen molar y refracción molar de miscelas de triglicéridos (triacetina, tributirina o tricaprilina) y alcoholes (etanol, 1-butanol o 1-hexanol)  

Directory of Open Access Journals (Sweden)

Full Text Available Values of molar refraction for every studied mixtures show linear plots versus molar fractions of triglyceride. Values of molar volume show this behaviour, but only for tributyrin-butanol or tricaprylin-butanol miscellas. However, in tributyrin-ethanol mixtures, volume contractions have been found, whereas triacetin-butanol and tributyrin-hexanol show volume expansions. These facts are related to the mode of being structured of the alcohol and triglyceride molecules in mixtures. A linear relationship between molar volume and temperature have been found, and also a linear dependence between the coefficient of thermal expansion at constant pressure and the molar fraction of triglyceride.Los valores de la refracción molar en todas las miscelas estudiadas presentan variaciones lineales frente a la fracción molar de triglicérido. la misma variación que presentan los valores del volumen molar de las miscelas tributirina y tricaprilina en butanol. Sin embargo, en las miscelas de tributirina-etanol se encuentran contracciones de volumen mientras que en las de triacetina-butanol y tributirina-hexanol expansiones, atribuidas en ambos casos a la forma de estructurarse las moléculas de alcohol y triglicérido en las miscelas. Por otra parte, se encuentra una variación lineal entre el volumen molar de las miscelas y la temperatura, y se establece una relación lineal entre el coeficiente de dilatación térmico molar a presión constante y la fracción molar de triglicérido en los cinco sistemas estudiados.

Rodríguez Rodríguez, M.; Galán Vallejo, M.; Muñoz Cueto, María J.

1992-01-01

245

Evaluation of superior-inferior position of mandibular canal and its anatomic variations on panoramic radiographs in patients over 18 referring to Khorasgan Dental School  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction: Attention to the location and the shape of mandibular canal is necessary to prevent problems during mandibular surgeries. This study was determined the prevalence of superior-inferior position of mandibular canal and its anatomic variations on panoramic radiographs in patients over 18 referring to Khorasgan Dental School.Materials and methods: In this descriptive-analytical study 260 radiographs were examined for variations in the position of mandibular canal. The subjects’ personal data, type of mandibular canal regarding its position based on Nortje‘s classification (high, low or intermediate position in relation to the apex of the first molar root and inferior border of the mandible), the distance from the superior border of lingula to the center of the ramus, existence of bifid canal and its shape and side and existence of anesthesia problems or impacted teeth on the same side as the bifid canal, were recorded. Data was analyzed by SPSS 10, using chi-squared test (?=0.05).Results: The most common canals in relation to their position relative to the first molar area, in descending order, were canals in middle position (55.8%), in the low position (35%), and in the high position (9.2%), respectively. No statistically significant differences were observed between the frequency distributions of canal positions (p value = 0.14%). The average distances from the superior border of lingula to the center of the ramus, in low position, middle position, and high position canals were 10.7, 11.35, and 10.87 mm, with no statistically significant differences (p value = 0.14). Conclusion: According to the results, there were no statistically significant differences between the frequency distributions of different positions of mandibular canals in relation to the root apex of the first molar and also between the distances from the lingual to the center of the ramus. Similar studies using CT scan technique are recommended. Key words: Inferior alveolar nerve, Mandible, Panoramic radiography.

Roshanak Ghafari; Ahmad Motaghi; Mehdi Elahi; Sima Saghaie

2011-01-01

246

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

UK PubMed Central (United Kingdom)

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

Hasegawa Y; Terada K; Kageyama I; Tsuchimochi T; Ishikawa F; Nakahara S

2013-01-01

247

Preoperative oral use of Ibuprofen or dexamethasone may improve the anesthetic efficacy of an inferior alveolar nerve block in patients diagnosed with irreversible pulpitis.  

UK PubMed Central (United Kingdom)

ARTICLE TITLE AND BIBLIOGRAPHIC INFORMATION: Effect of premedication with ibuprofen and dexamethasone on success rate of inferior alveolar nerve block for teeth with asymptomatic irreversible pulpitis: a randomized clinical trial. Shahi S, Moktari H, Rahimi S, Yavari HR, Narimani S, Abdolrahmi M, Nezafati S. J Endod 2013;39(2):160-2. REVIEWER: John M. Nusstein, DDS, MS PURPOSE/QUESTION: To determine whether preoperative oral administration of ibuprofen (400 mg), dexamethasone (0.5 mg), or placebo (lactose) would improve the anesthetic success rate of an inferior alveolar nerve block in patients with molars diagnosed with asymptomatic irreversible pulpitis SOURCE OF FUNDING: University: Dental and Periodontal Research Center of Tabriz, Tabriz University of Medical Sciences, Tabriz, Iran TYPE OF STUDY/DESIGN: Randomized controlled trial LEVEL OF EVIDENCE: Level 2: Limited-quality, patient-oriented evidence STRENGTH OF RECOMMENDATION GRADE: Not applicable.

Nusstein JM

2013-09-01

248

Corticotomy-assisted molar protraction with the aid of temporary anchorage device.  

UK PubMed Central (United Kingdom)

Abstract This case report describes the interdisciplinary management of a 58-year-old woman who was missing lower first molars and supraerupted maxillary first molars. The treatment plan included intrusion of the upper first molars and corticotomy-assisted mandibular second molar protraction with the aid of temporary anchorage devices. Miniscrews were effective in intrusion of the maxillary first molars and protraction of the lower second molars. Although good functional outcome was achieved in 41 months, the corticotomy-assisted procedure did not significantly reduce the treatment time.

Uribe F; Janakiraman N; Fattal AN; Schincaglia GP; Nanda R

2013-07-01

249

CONTRIBUTIONS TO MOLDOVA RIVER’S INFERIOR BASIN VEGETATION KNOWLEDGE  

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Full Text Available Authors describes in this paper two vegetal associations (mesophyllus grasslands), Festuco rubrae-Agrostetum capillaris Horvati? 1951 and Trisetetum flavescentis R?bel 1911 from the inferior basin of Moldova river.

M?RIU?A CONSTANTIN; T. CHIFU

2004-01-01

250

Symplastic Leiomyoma in the Suprarenal Inferior Vena Cava  

Science.gov (United States)

Leiomyomas are benign tumors of the soft tissue and may develop in any location where smooth muscle is present. Leiomyoma in the inferior vena cava is a rarely seen pathology, and symplastic leiomyoma is also a rare histological variant of leiomyoma. In this case, we present a rare histological variant of symplastic leiomyoma in the inferior vena cava (IVC). This is the first radiologically reported case of a symplastic leiomyoma of the IVC.

Kahveci, Volkan; Ogur, Torel; Cipe, Gokhan; Ozdemir, Sevim; Hazinedaroglu, Selcuk

2012-01-01

251

Collateral veins in inferior caval vein occlusion demonstrated via CT  

Energy Technology Data Exchange (ETDEWEB)

CT-scans of 12 patients with tumour-induced occlusion of the inferior vena cava were studied with regard to collateral veins. A comparison was performed with findings at phlebography in 10 patients and at autopsy in 2. The site and appearance of the main collateral pathway are presented. A close study of vascular structures renders useful information on collateral circulation in occlusion of the inferior vena cava.

Lien, H.H.; Lund, G.

1983-11-01

252

Inferior subluxation of the humeral head after trauma or surgery.  

UK PubMed Central (United Kingdom)

Inferior subluxation of the humeral head can occur after shoulder trauma or surgery. One hundred consecutive patients were evaluated prospectively after shoulder surgery or injury. The radiographic incidence of inferior subluxation of the humeral head 2 weeks after rotator cuff repair was 10%. The radiographic incidence of inferior subluxation after fracture of the proximal humerus was 42%, and the incidence 2 weeks after prosthetic humeral head replacement was 60%. The immediate postoperative radiograph showed an inferior subluxation of the humeral head in 4% of patients after prosthesis insertion, but no subluxations were seen immediately after rotator cuff repair. Radiographs made immediately after fracture of the humerus showed a 16% incidence of inferior subluxation. The inferior subluxation resolved by 6 weeks in 92% of patients with humeral fractures, 96% of patients with humeral head prostheses, and all patients who had undergone rotator cuff repair. No subluxations were seen 2 years after injury or surgery. The treatment used--early active exercises and a sling when not exercising--was effective.

Pritchett JW

1997-07-01

253

A safe, alternative technique for inferior turbinate reduction.  

UK PubMed Central (United Kingdom)

OBJECTIVE: Submucous resection of the inferior turbinates is a conventional technique for reducing their size to achieve patent nasal airways in situations where an enlarged turbinate contributes to airway obstruction. Many techniques and complications have been described in the past. We describe a new inferior turbinate reduction technique performed with powered instrumentation and assess its success and complication rates. STUDY DESIGN: A prospective study of 120 consecutive patients who underwent submucous resection of the inferior turbinates with a microdebrider. METHODS: Patient questionnaires were used for subjective assessment of symptoms before and after the procedure. We graded each patient's inferior turbinates for size from I to III before and 6 weeks after surgery for objective analysis. RESULTS: The common complications of standard submucous resection of inferior turbinates include excessive resection, postoperative bleeding, and crusting. The advantage of the microdebrider technique is the precise control of the amount of tissue and location of tissue that is removed on a submucosal plane. The complications encountered with this technique are limited to postoperative bleeding that occurred in 1.6% of patients. There was no crusting or excessive removal of tissue. CONCLUSION: The results show that submucous resection of inferior turbinates with a microdebrider is a safe method of achieving turbinate size reduction with minimal morbidity.

Friedman M; Tanyeri H; Lim J; Landsberg R; Caldarelli D

1999-11-01

254

Leiomiosarcoma de cava inferior: Hallazgo incidental/ Leimyosarcoma of the inferior vena cava: Incidental finding  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Objetivo: El leiomiosarcoma de cava inferior es una entidad poco frecuente, clínicamente insidiosa o silente y detectable en muchas ocasiones únicamente mediante estudios de imagen. Se presenta un caso intervenido en nuestro servicio y se revisa la literatura al respecto. Método: Mujer de 58 años con una masa suprarrenal derecha de 6 cm evidenciando su origen en la pared de vena cava durante el acto quirúrgico. Se realiza exeresis completa de la tumoración, y poster (more) iormente , radioterapia adyuvante sobre el lecho quirúrgico. Resultados: Tras más de 2 años de evolución, la paciente se encuentra libre de enfermedad. Conclusiones: Esta entidad presenta una escasa prevalencia, y en muchas ocasiones su hallazgo es incidental. La resección quirúrgica completa es la clave del tratamiento, aunque la probabilidad de recidiva local es elevada. Abstract in english Objective: Leiomyosarcoma of the inferior vena cava is a rare tumor, clinically silent which often remains undiagnosed for much longer. Imaging methods allow us to detect these entities. We report a single case and perform a bibliographic review. Methods: 58-year-old woman with a 6 cm adrenal mass, which during surgery was found to be a tumor from the wall of the vena cava. We performed complete removal of the mass. Radiotherapy of the surgical area was applied within thr (more) ee months following surgery. Results: Two years later, there is no evidence of disease recurrence. Conclusion: This is a rare entity, with low prevalence. Complete surgical excision is the gold standard for treatment. Local recurrence is a common finding during follow up.

Rodríguez Gómez, Ignacio; Rodríguez-Rivera García, J.; Álvarez Castelo, Luis; Gómez Veiga, Francisco; Lancina Martín, Alberto; Chantada Abal, Venancio; González Martín, M.

2007-11-01

255

Thermal Correction to the Molar Polarizability of a Boltzmann Gas  

CERN Document Server

Metrology in atomic physics has been crucial for a number of advanced determinations of fundamental constants. In addition to very precise frequency measurements, the molar polarizability of an atomic gas has recently also been measured very accurately. Part of the motivation for the measurements is due to ongoing efforts to redefine the International System of Units (SI) for which an accurate value of the Boltzmann constant is needed. Here, we calculate the dominant shift of the molar polarizability in an atomic gas due to thermal effects. It is given by the relativistic correction to the dipole interaction, which emerges when the probing electric field is Lorenz transformed into the rest frame of the atoms that undergo thermal motion. While this effect is small when compared to currently available experimental accuracy, the relativistic correction to the dipole interaction is much larger than the thermal shift of the polarizability induced by blackbody radiation.

Jentschura, U D; Mohr, P J

2013-01-01

256

Distalização dos molares superiores com aparelho Pendex: estudo cefalométrico prospectivo  

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Full Text Available A distalização dos molares superiores constitui um desafio na correção da má oclusão de Classe II em tratamentos sem extrações dentárias e sem avanço mandibular. Há uma procura por dispositivos que substituam a tração extrabucal (AEB) e que não exijam demasiada colaboração do paciente, o que estimula os ortodontistas a testarem métodos alternativos aos relatados na literatura. Dentre estes, destacam-se os aparelhos Pêndulo e Pendex de Hilgers. OBJETIVO: a realização desta pesquisa teve o intuito de avaliar, mediante a cefalometria, os efeitos do aparelho Pendex aplicado no final da dentadura mista e na dentadura permanente. METODOLOGIA: a amostra constou de 14 pacientes com má oclusão de Classe II bilateral, com média de idade de 11 anos e 3 meses. Foram tomadas duas telerradiografias em norma lateral, uma correspondente ao início do tratamento e outra aproximadamente 5 meses após sua finalização, quando a relação dos molares encontrava-se sobrecorrigida. RESULTADOS: após a determinação e mensuração das grandezas cefalométricas lineares e angulares e análise estatística (Teste t de Student), pode-se concluir que os efeitos do aparelho Pendex foram predominantemente ortodônticos: distalização da coroa dos primeiros molares permanentes numa velocidade média de 0,8 mm/mês e vestibularização dos incisivos superiores com aumento do trespasse horizontal. CONCLUSÃO: assim sendo, quando há indicação para distalização dos molares, cumpre-se fazer uma análise dos fatores envolvidos, a fim de eleger, com prudência, a solução terapêutica mais adequada às exigências individuais e profissionais.The upper molar distalization is a challenge in the Class II malocclusion correction in treatments without dental extraction and without mandibular advance. There is a search for appliances that replace the extrabuccal traction (AEB) and do not require patient cooperation, that stimulate the orthodontists to test the alternative methods related in the literature. Among these, we see the Hilgers' Pendulum and Pend-X appliances. AIM: The realization of this research has the aim to evaluate, through the cephalometry, the effects of the Pend-X appliance applied in the end of the mixed dentition and in the permanent too. METHODS: The sample consisted of 14 patients with bilateral Class II malocclusion and with mean age of 11 years and 3 months old. Two teleradiographies were taken in the lateral norm, one was correspondent to the beginning of the treatment and the other one after approximately 5 months, when the molars relation were overcorrected. RESULTS: After the determination and measurement of angular and linear cephalometry quantities and the statistical analysis (Student's t tests) could one to conclude that the effects of the Pend-X appliance were predominantly dental: first molars crown distalization in a mean speed of 0.8mm/month and superior incisive vestibularization with overjet increase. CONCLUSION: So, when there is indication to molars distalization, we have to analyse the involved factors to elect, with prudence, the most adequated therapeutic solution with the individual and professional exigencies.

Eduardo César Almada Santos; Omar Gabriel da Silva Filho; Patrícia Maria Pizzo Reis; Francisco Antônio Bertoz

2007-01-01

257

Mini-implants: mechanical resource for molars uprighting.  

UK PubMed Central (United Kingdom)

INTRODUCTION: The early orthodontic treatment allows correction of skeletal discrepancies by growth control, and the elimination of deleterious habits, which are risk factors for the development of malocclusions, favoring for the correction of tooth positioning later in a second treatment stage. During development of teeth and occlusion, the mandibular second molars commonly erupt in the oral cavity after all other teeth of the anterior region. In their eruptive process there may be a condition known as tooth impaction, which precludes its complete eruption and requires proper uprighting treatment. The temporary anchorage devices allow disimpaction and movement of these teeth directly to their final position, without the need of patient compliance or reaction movements in other parts of the arch. OBJECTIVE: This paper aims at describing a case report of the treatment of a patient with Angle Class II malocclusion, performed in two phases, in which mini-implants were used for uprighting the impacted mandibular second molars.

Allgayer S; Platcheck D; Vargas IA; Loro RC

2013-01-01

258

Bilateral Taurodontism in Deciduous Molars: A case Report  

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Full Text Available Taurodontism is a rare dental anomaly in which the involved tooth has an enlarged and elongated body and pulpchamber with apical displacement of the pulpal floor. It has a very low incidence and very few cases are reported inliterature in deciduous dentition. Endodontic treatment of a taurodont tooth is challenging and requires special handlingbecause of the proximity and apical displacement of the roots. In this article a case of five year child with bilateralinvolvement of mandibular second molars is presented.

Parimala Tyagi,; Shilpy Gupta

2010-01-01

259

Endodontic and post-endodontic management of a fused molar.  

UK PubMed Central (United Kingdom)

Treatment of fused teeth needs special care and attention to the bizarre anatomy. This paper describes root canal treatment of a fused carious tooth presenting with apical periodontitis. It is a rare case of fusion of the mandibular second molar with a paramolar. There is no literature regarding placement of crown over endodontically treated fused teeth. In this case, the fused teeth were endodontically treated and restored by a porcelain fused to metal crown.

Gupta R; Prakash V; Sharma M

2013-03-01

260

Moxel: A molar tooth voxel model for dosimetric studies  

International Nuclear Information System (INIS)

Stylized numerical models of the tooth are usually employed in qualification procedure related to Electronic Paramagnetic Resonance in long-term accidental contamination dose reconstruction. In this work a voxel model was developed from the microCT image data set of a human non contaminated molar tooth. A stylized model, reproducing the characteristics of the voxel model, was also created in order to investigate the level of accuracy that can be obtained in this kind of study.

2010-01-01

 
 
 
 
261

Maxillary first molar with two palatal roots: a case report  

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Full Text Available "n The goal of each root canal therapy is cleaning and obturating the entire root canal system. A thorough knowledge of root and root canal morphology and a good anticipation of their possible morphologic variations are essential and will help to reduce endodontic failure caused by incomplete root canal preparation and obturation. In this study, one case of maxillary molar with two palatal roots has been reported in a 40-year-old moman.

Salapoor M; Farhad Mollashahi N

2010-01-01

262

Effect of air abrasion and polishing on primary molar fissures.  

UK PubMed Central (United Kingdom)

AIM: To evaluate the effect of air abrasion and polishing on primary molar fissures under light microscopy. METHODS: 15 exfoliated primary second molars were longitudinally sectioned and photographed under a stereomicroscope (40×; baseline evaluation). Sections were then randomly allocated into one of the two groups (n = 15) and treated by either air abrasion (aluminium oxide jet) or air polishing (sodium bicarbonate jet) for 30 s. After treatment, sections were washed with an air/water spray, dried with absorbent paper, and photographed as previously described (final evaluation). Baseline and final morphology were compared by two blinded examiners who evaluated changes in the width and depth of fissures. STATISTICS: The percentage of changed fissures was analysed, and the two treatments were compared using the Mann-Whitney test (? = 0.01). RESULTS: Both air systems resulted in fissure changes in most (93.3 %) of the sections. No significant differences in fissure width changes were found between treatments, but when changes in fissure depth were evaluated, air polishing was found to be less damaging than air abrasion (p < 0.01). CONCLUSION: Air abrasion and polishing cause changes to the anatomical configuration of occlusal fissures of primary molars.

Lenzi TL; Menezes LB; Soares FZ; Rocha RO

2013-04-01

263

Enamel development in primary molars from children with familial dysautonomia.  

UK PubMed Central (United Kingdom)

OBJECTIVES: Familial dysautonomia (FD) is an autosomal recessive disorder, classified as a hereditary sensory and autonomic neuropathy type III, associated with growth defects affecting postnatal development. This study analysed prenatal and postnatal enamel development and postnatal calcification in upper second primary molars from FD children in comparison with healthy controls. The postnatal enamel of FD was also examined histologically for manifestation of growth insults. DESIGN: The analyses were carried out on two ground sections, connecting buccal and palatinal cusp tips of mesial and distal cusps. The measurements included apical location of neonatal line, width and percentage of prenatal enamel. Chemical analyses were performed using an energy dispersive X-ray spectrometer. RESULTS: The prenatal proliferative phase and prenatal apposition rate of enamel were faster on the distal cusps in FD. The postnatal enamel thickness was similar in both groups. The phosphate content of FD teeth was significantly higher and the Ca/P ratio was significantly lower. Postnatal traumatic lines were observed in all FD children and in only one healthy child. CONCLUSIONS: FD upper primary second molars showed thicker prenatal enamel formation in comparison to healthy and other syndromes and better mineralisation. All FD primary molars showed large number of postnatal traumatic lines, implicating severe traumatic episodes during the first year of life.

Zilberman U; Zilberman S; Keinan D; Elyiahu M

2010-11-01

264

Variable permanent mandibular first molar: Review of literature.  

UK PubMed Central (United Kingdom)

INTRODUCTION: The success of root canal therapy depends on the locations of all the canals, thourough debridement and proper sealing. At times the clinicians are challenged with variations in morphology of root canal. This review article attempts to list out all the variations of permanent mandibular first molar published so for in the literature. MATERIALS AND METHODS: An exhaustive search was undertaken using PUBMED database to identify published literature from 1900 to 2010 relating to the root canal morphology of permanent first molar by using key words. The selected artcles were obtained and reviewed. RESULTS: Total ninty seven articles were selected out of which 50 were original article and forty seven were case reports. The incidence of third canal in mesial root was 0.95% to 15%. The incidence of three rooted mandibular first molar was 3% to 33%. Only ninety cases reported with c-shape canal configuration. Incidence of Taurodintism without congenital disorder was very rare. CONCLUSION: The root canal treatment requires proper knowlegde of variations in root canal morphology in order to recognise, disinfect and seal all portal of exit. This can be accomplished with proper diagnosis using newer modes, modification in access preparation, use of operating microscope, enhanced methods of disinfecting and sealing of all canals.

Ballullaya SV; Vemuri S; Kumar PR

2013-03-01

265

Molar macrowear reveals Neanderthal eco-geographic dietary variation.  

UK PubMed Central (United Kingdom)

Neanderthal diets are reported to be based mainly on the consumption of large and medium sized herbivores, while the exploitation of other food types including plants has also been demonstrated. Though some studies conclude that early Homo sapiens were active hunters, the analyses of faunal assemblages, stone tool technologies and stable isotopic studies indicate that they exploited broader dietary resources than Neanderthals. Whereas previous studies assume taxon-specific dietary specializations, we suggest here that the diet of both Neanderthals and early Homo sapiens is determined by ecological conditions. We analyzed molar wear patterns using occlusal fingerprint analysis derived from optical 3D topometry. Molar macrowear accumulates during the lifespan of an individual and thus reflects diet over long periods. Neanderthal and early Homo sapiens maxillary molar macrowear indicates strong eco-geographic dietary variation independent of taxonomic affinities. Based on comparisons with modern hunter-gatherer populations with known diets, Neanderthals as well as early Homo sapiens show high dietary variability in Mediterranean evergreen habitats but a more restricted diet in upper latitude steppe/coniferous forest environments, suggesting a significant consumption of high protein meat resources.

Fiorenza L; Benazzi S; Tausch J; Kullmer O; Bromage TG; Schrenk F

2011-01-01

266

Molar macrowear reveals Neanderthal eco-geographic dietary variation.  

Science.gov (United States)

Neanderthal diets are reported to be based mainly on the consumption of large and medium sized herbivores, while the exploitation of other food types including plants has also been demonstrated. Though some studies conclude that early Homo sapiens were active hunters, the analyses of faunal assemblages, stone tool technologies and stable isotopic studies indicate that they exploited broader dietary resources than Neanderthals. Whereas previous studies assume taxon-specific dietary specializations, we suggest here that the diet of both Neanderthals and early Homo sapiens is determined by ecological conditions. We analyzed molar wear patterns using occlusal fingerprint analysis derived from optical 3D topometry. Molar macrowear accumulates during the lifespan of an individual and thus reflects diet over long periods. Neanderthal and early Homo sapiens maxillary molar macrowear indicates strong eco-geographic dietary variation independent of taxonomic affinities. Based on comparisons with modern hunter-gatherer populations with known diets, Neanderthals as well as early Homo sapiens show high dietary variability in Mediterranean evergreen habitats but a more restricted diet in upper latitude steppe/coniferous forest environments, suggesting a significant consumption of high protein meat resources. PMID:21445243

Fiorenza, Luca; Benazzi, Stefano; Tausch, Jeremy; Kullmer, Ottmar; Bromage, Timothy G; Schrenk, Friedemann

2011-03-18

267

Factores asociados a la pérdida del primer molar permanente en escolares de Campeche, México: Pérdida del primer molar permanente Associated factors to loss of the first permanent molar on scholars of Campeche, Mexico  

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Full Text Available Objetivo: 1) determinar la prevalencia de pérdida del primer molar permanente (PMP) en niños escolares de 6 a 13 años de edad, e 2) investigar la relación entre la pérdida del PMP y factores sociodemográficos, socioeconómicos, conductuales y clínicos. Material y Métodos: Se realizó un estudio transversal en 1517 escolares de la ciudad de Campeche, México. Un cuestionario estructurado dirigido a las madres fue enviado a estas para explorar las variables sociodemográficas, socioeconómicas y conductuales. En los niños se efectuó un examen bucal clínico. En el análisis se realizaron estadísticas descriptivas y un modelo multivariado de regresión logística binaria. Resultados: La prevalencia de sujetos con al menos un PMP perdido fue de 7.5% (n=114). De los 6,068 PMP examinados, 2.1% (n=130) se clasificaron como perdidos. Los PMP de la arcada inferior se perdieron con mayor frecuencia (70%, n=91). Las variables asociadas a la pérdida del PMP que permanecieron en el modelo final fueron: mayor edad (RM= 1.66, IC95%= 1.45 - 1.89) y la higiene bucal regular e inadecuada (RM= 2.64, IC95%= 1.39 - 5.02). Así como una interacción entre los defectos estructurales del esmalte y el sexo, considerando 1) el efecto del defecto estructural del esmalte en los niños (RM= 9.84, IC95%= 4.82 - 20.14), y 2) el efecto del defecto estructural del esmalte en las niñas (RM= 38.10, IC95%= 18.98 - 76.48). Conclusiones: La prevalencia de pérdida del PMP fue relativamente alta considerando el grupo de edad bajo investigación (6-13 años de edad). Encontramos variables de diversos tipos asociadas a la pérdida del PMP. Los datos presentados sirven como un indicador del estado de salud bucal y podrían ser empleados como línea basal para la evaluación de programas de salud dental preventivosAbstract Objectives: 1) to determine the prevalence of loss of the first permanent molar (FPM) on schoolchildren aged 6-13 years, and 2) to investigate the relationship between loss of FPM and sociodemographic, socioeconomic, behavioural, and clinic factors. Material and Methods: A cross-sectional study on 1517 children of Campeche City, Mexico. The children’s mothers were surveyed using a questionnaire to investigate sociodemographic, socioeconomic, behavioural variables. Clinic dental examinations were realized in children. In the analyses, descriptive statistics and binary logistic regression analyses were used. Results: The prevalence of subjects with at least one FPM lost was 7.5% (n=114). Of 6,068 FMP examined, 2.1% (n=130) were classified as lost. The mandibular FPM were lost more frequently (70%, n=91). The associated variables to loss of FPM that remained in the final model were: higher age (OR= 1.66, CI95%= 1.45 - 1.89) and regular and inadequate oral hygiene (OR= 2.64, CI95%= 1.39 - 5.02). As well as an interaction between structural enamel defects and sex, thus we can consider 1) the effect of structural enamel defects on boys (OR= 9.84, CI95%= 4.82 - 20.14), and 2) the effect of structural enamel defects on girls (OR= 38.10, CI95%= 18.98 - 76.48). Conclusions: The prevalence of loss of the FPM was relatively higher considered the age group under investigation (6-13 years old). We found variables of diverse types associated with loss of the FPM. The data presented serve like an indicator of the oral health status and could be employees as baseline for the evaluation of preventive dental health programs

Alejandro José Casanova-Rosado, M en C; Carlo Eduardo Medina-Solís, M en C²; Juan Fernando Casanova-Rosado, CDEO., M en C¹; Ana Alicia Vallejos-Sánchez, M en C¹; Gerardo Maupomé., PhD3; Maria de la Luz Kageyama-Escobar, Dra en C

2005-01-01

268

Avaliação da efetividade do método de Tanaka-Johnston para predição do diâmetro mésio-distal de caninos e pré-molares não-irrompidos  

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Full Text Available No presente estudo, os autores avaliaram o método de predição de Tanaka-Johnston com o objetivo de verificar sua efetividade para os lados direito e esquerdo, para ambos os sexos e para as raças branca, mulato claro, mulato médio, mulato escuro e negra, na cidade de Salvador - Bahia. Com o auxílio de um paquímetro digital, mediu-se o diâmetro mésio-distal dos incisivos inferiores permanentes, caninos e pré-molares, já irrompidos na cavidade bucal, de 98 indivíduos (45 do sexo masculino e 53 do sexo feminino), com idade variando entre 13 e 29 anos. Através de testes estatísticos, compararam-se os resultados obtidos a partir da aplicação das fórmulas de Tanaka-Johnston com os valores reais. Após análise dos resultados, observou-se que a correlação entre os valores estimados pela técnica de Tanaka-Johnston e os valores reais foram maiores para o sexo feminino que para o sexo masculino. Em relação à raça, os coeficientes de correlação foram satisfatórios para todas, sendo maior no arco dentário superior para a raça mulato escuro (0,67) e no arco dentário inferior para a raça mulato claro (0,74). Considerando-se os lados, os achados revelaram um maior coeficiente de correlação para o arco dentário inferior do lado esquerdo (0,61). Pôde-se concluir, neste trabalho, que o método de Tanaka-Johnston, apesar de ter sido preconizado a partir de uma amostra de descendentes europeus, é indicado para predição do diâmetro mésio-distal de caninos e pré-molares não-irrompidos para diferentes raças, sexos e lados dos arcos dentários na amostra estudada.

MARCHIONNI Viviane Maria Teixeira; SILVA Maria Catarina de Araújo; ARAÚJO Telma Martins de; REIS Silvia Regina de Almeida

2001-01-01

269

Excess isobaric molar heat capacities and excess molar volumes for ethanol + n-decane and n-undecane systems  

International Nuclear Information System (INIS)

Densities between (278.15 and 308.15) K and isobaric heat capacities per unit volume from (280.15 to 308.15) K for ethanol + n-decane and n-undecane systems were determined at atmospheric pressure over the whole composition range. From these data, excess molar volumes and excess isobaric molar heat capacities were calculated by means of the Benson and Kiyohara's criterion. Results were analyzed in terms of the well-known microscopic effects that take place in alkanol + n-alkane systems. Their dependence with the size of the linear alkane was studied with the help of literature data of short alkyl chain 1-alkanol + long alkyl chain alkane systems.

2005-01-01

270

Endodontic treatments of mandibular first molar with middle mesial canal: two case reports.  

UK PubMed Central (United Kingdom)

The mandibular first molars mostly have two mesial canals. In this report, two cases of mandibular first molars with three mesial canals are presented. The middle mesial canal was detected under endodontic microscope and further confirmed by cone-beam computed tomography and angled radiography, respectively. The purpose of this paper was to highlight the possibility of an aberrant root canal in a mandibular first molar and to help reduce the failure rates of the dental pulp treatment of the mandibular first molar.

Lu Q; Wang P; Yang B; Liu XJ; Wang SY; Yu Q

2013-01-01

271

Extração de incisivo inferior: uma opção terapêutica Mandibular incisor extraction: a terapeutic option  

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Full Text Available O planejamento ortodôntico em casos de apinhamento, normalmente oscila entre não extração e extrações de quatro pré-molares. Em determinadas situações a escolha por uma alternativa ou outra pode provocar conseqüências negativas. A extração de um incisivo inferior em casos bem selecionados é uma abordagem eficiente, pouco explorada na literatura. Entretanto, para sua correta indicação o ortodontista precisa conhecer as variáveis que envolvem este tipo de terapia. O objetivo deste trabalho é abordar de maneira sistemática os diversos aspectos clínicos relacionados com esta modalidade terapêutica, ilustrando sua aplicabilidade com a apresentação de casos clínicos.The orthodontic treatment strategy in crowded cases has usually been oscillated among no extraction and premolars' extractions. In certain situations the choice for an alternative or another would bring negative consequences. The extraction of a lower incisor in well selected cases represents an efficient approach, although little attention has been given to this kind of therapy in the literature. However, the correct indication must be evaluated by the orthodontist, who needs to know the peculiarities related to this treatment modality. In this sense, the aim of this work is to approach in a systematic way the several clinical aspects related with this therapeutic modality, illustrating its applicability through the presentation of treated cases.

Camilo Massa Ferreira Lima; Eduardo Lacet; Candice Ramos Marques

2005-01-01

272

An odontometric study of the maxillary molars in Australian marsupials. I. The koala (Phascolarctos cinereus).  

UK PubMed Central (United Kingdom)

Crown dimensions of the maxillary molars were measured in the koala (Phascolarctos cinereus). There were no significant differences in crown diameters between the first and second molars, however the fourth molars were reduced in all crown diameters. The third molar was smaller than the first or second molars in buccolingual crown diameters but there were no significant differences in mesiodistal crown diameters. It is proposed that the similar shapes of the first and second molars are associated with similar types of masticatory activity involving these teeth, The shape of the third molar, which is reduced in size buccolingually, may be linked to the koala's occlusal function which is characterized by a condylar action that leads to differences in movement between opposing anterior and posterior molar teeth during the occlusal stroke. The fourth molar, the smallest of the molar teeth in crown diameter, erupts significantly later than the other molars, and its reduction may be explained by the terminal and distal reduction theories. It is proposed that the pattern of molar morphology in the koala is associated with both masticatory activity linked to its characteristic occlusal function, as well as reflecting the sequence of tooth emergence.

Ueno R; Iimura A; Yoshida S; Kondo K; Sato I; Henneberg M; Townsend GC

2010-02-01

273

Protraction of mandibular second and third molars into missing first molar spaces for a patient with an anterior open bite and anterior spacing.  

UK PubMed Central (United Kingdom)

In a young woman, aged 18 years 8 months, who had an anterior open bite and anterior spacing, the right and left mandibular first molar extraction spaces were closed by protraction of the second and third molars without reciprocal retraction of the incisors and the premolars. The amounts of protraction for the second molars were 12 mm on the right side and 11 mm on the left side. Two miniscrews were inserted into the mesiobuccal side of the edentulous spaces, and 2 more screws were inserted into the anterior sites after removing previous miniscrews. In addition, 4 miniscrews were inserted into the buccal and palatal sides between the first and second maxillary molars to intrude the maxillary posterior teeth, which had extruded into the missing mandibular spaces. Careful biomechanical consideration was used to prevent extrusion of the molars and worsening of the anterior open bite from protraction of the posterior teeth. Ultimately, the anterior open bite was corrected by both intrusion of the maxillary molars and extrusion of the maxillary anterior teeth. Excellent occlusion and correction of the anterior open bite were achieved without tipping, rotation of the posterior teeth, or other problems. The right mandibular third molar, which had been impacted at the beginning of treatment, erupted into the second molar space and functioned properly. At the 1-year follow-up examination, the patient had a slight anterior open bite, but closure of the first molar extraction spaces was well maintained.

Baik UB; Chun YS; Jung MH; Sugawara J

2012-06-01

274

Patient with oligodontia treated with a miniscrew for unilateral mesial movement of the maxillary molars and alignment of an impacted third molar.  

UK PubMed Central (United Kingdom)

This report describes the treatment of a 20-year-old woman with a dental midline deviation and 7 congenitally missing premolars. She had retained a maxillary right deciduous canine and 4 deciduous second molars, and she had an impacted maxillary right third molar. The maxillary right deciduous second molar was extracted, and the space was nearly closed by mesial movement of the maxillary right molars using an edgewise appliance and a miniscrew for absolute anchorage. The miniscrew was removed, and the extraction space of the maxillary right deciduous canine was closed, correcting the dental midline deviation. After the mesial movement of the maxillary right molars, the impacted right third molar was aligned. To prevent root resorption, the retained left deciduous second molars were not aligned by the edgewise appliance. The occlusal contact area and the maximum occlusal force increased over the 2 years of retention. The miniscrew was useful for absolute anchorage for unilateral mesial movement of the maxillary molars and for the creation of eruption space and alignment of the impacted third molar in a patient with oligodontia.

Maeda A; Sakoguchi Y; Miyawaki S

2013-09-01

275

The effects of inferior olive lesion on strychnine seizure  

International Nuclear Information System (INIS)

Bilateral inferior olive lesions, produced by systemic administration of the neurotoxin 3-acetylpyridine (3AP) produce a proconvulsant state specific for strychnine-induced seizures and myoclonus. We have proposed that these phenomena are mediated through increased excitation of cerebellar Purkinje cells, through activation of glutamate receptors, in response to climbing fiber deafferentation. An increase in quisqualic acid (QA)-displaceable [3H]AMPA [(RS)-alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid] binding in cerebella from inferior olive-lesioned rats was observed, but no difference in [3H]AMPA binding displaced by glutamate, kainic acid (KA) or glutamate diethylester (GDEE) was seen. The excitatory amino acid antagonists GDEE and MK-801 [(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclo-hepten-5,10 imine] were tested as anticonvulsants for strychnine-induced seizures in 3AP inferior olive-lesioned and control rats. Neither drug effected seizures in control rats, however, both GDEE and MK-801 produced a leftward shift in the strychnine-seizure dose-response curve in 3AP inferior olive-lesioned rats. GDEE also inhibited strychnine-induced myoclonus in the lesioned group, while MK-801 had no effect on myoclonus. The decreased threshold for strychnine-induced seizures and myoclonus in the 3AP-inferior olive-lesioned rats may be due to an increase in glutamate receptors as suggested by the [3H]AMPA binding data.

1990-01-01

276

The effects of inferior olive lesion on strychnine seizure  

Energy Technology Data Exchange (ETDEWEB)

Bilateral inferior olive lesions, produced by systemic administration of the neurotoxin 3-acetylpyridine (3AP) produce a proconvulsant state specific for strychnine-induced seizures and myoclonus. We have proposed that these phenomena are mediated through increased excitation of cerebellar Purkinje cells, through activation of glutamate receptors, in response to climbing fiber deafferentation. An increase in quisqualic acid (QA)-displaceable ({sup 3}H)AMPA ((RS)-alpha-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid) binding in cerebella from inferior olive-lesioned rats was observed, but no difference in ({sup 3}H)AMPA binding displaced by glutamate, kainic acid (KA) or glutamate diethylester (GDEE) was seen. The excitatory amino acid antagonists GDEE and MK-801 ((+)-5-methyl-10,11-dihydro-5H-dibenzo(a,d)cyclo-hepten-5,10 imine) were tested as anticonvulsants for strychnine-induced seizures in 3AP inferior olive-lesioned and control rats. Neither drug effected seizures in control rats, however, both GDEE and MK-801 produced a leftward shift in the strychnine-seizure dose-response curve in 3AP inferior olive-lesioned rats. GDEE also inhibited strychnine-induced myoclonus in the lesioned group, while MK-801 had no effect on myoclonus. The decreased threshold for strychnine-induced seizures and myoclonus in the 3AP-inferior olive-lesioned rats may be due to an increase in glutamate receptors as suggested by the ({sup 3}H)AMPA binding data.

Anderson, M.C.; Chung, E.Y.; Van Woert, M.H. (Mount Sinai School of Medicine, New York, NY (USA))

1990-10-01

277

Aerodynamic effects of inferior turbinate reduction: computational fluid dynamics simulation.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To investigate the aerodynamic consequences of conservative unilateral inferior turbinate reduction using computational fluid dynamics methods to accomplish detailed nasal airflow simulations. DESIGN: A high-resolution, finite-element mesh of the nasal airway was constructed from magnetic resonance imaging data of a healthy man. Steady-state, inspiratory airflow simulations were conducted at 15 L/min using the techniques of computational fluid dynamics. INTERVENTION: Circumferential removal of 2 mm of soft tissue bulk along the length of the left inferior turbinate was modeled. MAIN OUTCOME MEASURES: Nasal airflow distribution and pressure profiles were computed before and after simulated left inferior turbinate reduction. RESULTS: Simulated inferior turbinate reduction resulted in a broad reduction of pressure along the nasal airway, including the regions distant from the inferior turbinate vicinity. In contrast, relative airflow changes were regional: airflow was minimally affected in the valve region, increased in the lower portion of the middle and posterior nose, and decreased dorsally. CONCLUSION: Use of computational fluid dynamics methods should help elucidate the aerodynamic significance of specific surgical interventions and refine surgical approaches to the nasal airway.

Wexler D; Segal R; Kimbell J

2005-12-01

278

Anterior ST segment depression in acute inferior myocardial infarction as a marker of greater inferior, apical, and posterolateral damage  

Energy Technology Data Exchange (ETDEWEB)

The clinical significance of anterior precordial ST segment depression during acute inferior myocardial infarction was evaluated in 67 consecutive patients early after onset of symptoms with gated blood pool scans, thallium-201 perfusion images, and 12-lead ECGs. Patients with anterior ST depression (n = 33) had depressed mean values for left ventricular ejection fraction (54 +/- 2% (mean +/- S.E.M.) vs 59 +/- 2%; p = 0.02), cardiac index (3.1 +/- 0.2 vs 3.6 +/- 0.2 L/m2; p = 0.03), and ratio of systolic blood pressure to end-systolic volume (2.0 +/- 0.1 vs 2.5 +/- 0.3 mm Hg/ml; p = 0.04) compared to patients with no anterior ST depression (n = 34). Patients with anterior ST depression had (1) lower mean wall motion values for the inferior, apical, and inferior posterolateral segments (p less than 0.05) and (2) greater reductions in thallium-201 uptake in the inferior and posterolateral regions (p less than 0.05). However, anterior and septal (1) wall motion and (2) thallium-201 uptake were similar in patients with and without ST depression. Thus, anterior precordial ST segment depression in patients with acute inferior wall myocardial infarction represents more than a reciprocal electrical phenomenon. It identifies patients with more severe wall motion impairment and greater hypoperfusion of the inferior and adjacent segments. The poorer global left ventricular function in these patients is a result of more extensive inferior infarction and not of remote septal or anterior injury.

Ruddy, T.D.; Yasuda, T.; Gold, H.K.; Leinbach, R.C.; Newell, J.B.; McKusick, K.A.; Boucher, C.A.; Strauss, H.W.

1986-12-01

279

Estudo clínico e ultraestrutural pós-turbinectomia inferior parcial Clinical and ultrastructural study after partial inferior turbinectomy  

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Full Text Available O presente trabalho refere-se ao estudo dos resultados clínicos e histológicos obtidos após a turbinectomia inferior parcial (TIP), cirurgia indicada no tratamento da obstrução nasal crônica causada pela hipertrofia das conchas nasais inferiores. MATERIAL E MÉTODOS: Foram estudados vinte pacientes, divididos em dois grupos de dez cada (grupos A e B), submetidos à TIP, associada à septoplastia ou não. Os pacientes foram reavaliados clinicamente e histologicamente (com biópsia das áreas regeneradas das conchas inferiores), em dois períodos pós-operatórios diferentes: um grupo após oito a doze meses (grupo A) e outro após dois anos de TIP (grupo B). RESULTADOS: Os resultados clínicos mostraram-se satisfatórios para o alívio da obstrução nasal no grupo A, e insatisfatórios no grupo B. Entretanto, melhores resultados histológicos, com maior recuperação e diferenciação epitelial da mucosa regenerada das conchas inferiores após a TIP foram observados no grupo B, com sua ultraestrutura ciliar normal. CONCLUSÕES: A cirurgia revelou ser eficaz a curto, mas não em médio prazo, apesar da recuperação histológica ter sido importante.We report clinical and histological results obtained after partial inferior turbinectomy (PIT), surgery indicated for the treatment of chronic nasal obstruction. METHODS: Twenty patients were divided into two groups submitted to PIT plus septoplasty and PIT alone. The patients were reassessed clinically and histologically by means of a biopsy of the regenerated areas in the inferior turbinates at two different times after PIT, i.e., after 8 to 12 months (group A) and after two years (group B). RESULTS: The clinical results proved to be satisfactory for the relief of nasal obstruction in group A and unsatisfactory in group B. However, better histological results with better recovery and epithelial differentiation of the regenerated mucosa of the inferior turbinates after PIT were observed in group B. CONCLUSION: Surgery proved to be effective on a short-term but not on a long-term basis, and histological recovery did not accompany improvement of clinical signs and symptoms.

Rogério Dutra Bandos; Valder Rodrigues de Mello; Maria Dolores Seabra Ferreira; Maria Rossato; Wilma Terezinha Anselmo-Lima

2006-01-01

280

Clinical and ultrastructural study after partial inferior turbinectomy.  

UK PubMed Central (United Kingdom)

UNLABELLED: We report clinical and histological results obtained after partial inferior turbinectomy (PIT), surgery indicated for the treatment of chronic nasal obstruction. METHODS: Twenty patients were divided into two groups submitted to PIT plus septoplasty and PIT alone. The patients were reassessed clinically and histologically by means of a biopsy of the regenerated areas in the inferior turbinates at two different times after PIT, i.e., after 8 to 12 months (group A) and after two years (group B). RESULTS: The clinical results proved to be satisfactory for the relief of nasal obstruction in group A and unsatisfactory in group B. However, better histological results with better recovery and epithelial differentiation of the regenerated mucosa of the inferior turbinates after PIT were observed in group B. CONCLUSION: Surgery proved to be effective on a short-term but not on a long-term basis, and histological recovery did not accompany improvement of clinical signs and symptoms.

Bandos RD; Rodrigues de Mello V; Ferreira MD; Rossato M; Anselmo-Lima WT

2006-09-01

 
 
 
 
281

Cerebelo y tracto urinario inferior/ Cerebellum and lower urinary tract  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish OBJETIVO: Revisar el papel del cerebelo en la dinámica del tracto urinario inferior. MÉTODO: Metodología anatomofuncional que incluye estudio estructural, funcional y de neurotransmisores. RESULTADOS: Se describen las complejas conexiones del cerebelo y su influencia sobre la función del tracto urinario inferior. CONCLUSIONES: Es sorprendente la interrelación funcional entre cerebelo y tracto urinario inferior, ejerciendo un papel modulador inhibitorio durante la fase de llenado y facilitador durante la fase de vaciado. Abstract in english OBJECTIVES: To review the role of cerebellum on the lower urinary tract dynamics. METHODS: Anatomic-functional methodology including structural, functional and neurotransmitters study. RESULTS: We describe the complex connections of the cerebellum and its influence on the lower urinary tract function. CONCLUSIONS: It is surprising the functional relationship between cerebellum and lower urinary tract, playing a inhibitory modulating role during the filling phase and facilitating the voiding phase.

Díez Rodríguez, Jesús María; Salinas Casado, Jesús; Mañas Pelillo, Antonio; Mora Durbán, Miguel; Navarro Sebastián, Javier; Arrizabalaga Moreno, Mariano

2005-06-01

282

Adaptive coupling of inferior olive neurons in cerebellar learning.  

Science.gov (United States)

In the cerebellar learning hypothesis, inferior olive neurons are presumed to transmit high fidelity error signals, despite their low firing rates. The idea of chaotic resonance has been proposed to realize efficient error transmission by desynchronized spiking activities induced by moderate electrical coupling between inferior olive neurons. A recent study suggests that the coupling strength between inferior olive neurons can be adaptive and may decrease during the learning process. We show that such a decrease in coupling strength can be beneficial for motor learning, since efficient coupling strength depends upon the magnitude of the error signals. We introduce a scheme of adaptive coupling that enhances the learning of a neural controller for fast arm movements. Our numerical study supports the view that the controlling strategy of the coupling strength provides an additional degree of freedom to optimize the actual learning in the cerebellum. PMID:23337637

Tokuda, Isao T; Hoang, Huu; Schweighofer, Nicolas; Kawato, Mitsuo

2012-12-28

283

Efeito do bisel e do material restaurador sobre a resistência à fratura coronária em pré-molares inferiores com restaurações cervicais  

Directory of Open Access Journals (Sweden)

Full Text Available The aim of this study was to evaluate the fracture strength of lower premolars with cervical restorations, with and without marginal bevel. It was made 64 extracted teeth, that had received cervical standardized preparing, divided in the following groups: Group 1 - sound teeth; Group 2 - teeth only prepared (no restoration); Group 3 - restored teeth with microfi lled composite resin (A110, 3M Espe); Group 4 - prepared teeth with marginal bevel and restored with microfi lledcomposite resin (A110); Group 5 - restored teeth with microhybrid composite resin (Z250, 3M Espe); Group 6 - prepared teeth with marginal bevel and restored with microhybrid composite resin (Z250); Group 7 -restored teeth with low viscosity composite resin (FLOW, 3M Espe); Group 8 - prepared teeth with marginal bevel and restored with low viscosity composite resin (FLOW). For accomplishment of the resistance test, the specimens had been placed individually in a metallic matrix, where the tooth was in a 45° angle in relation to the ground, being exerted a compressive force on the premolar crown in a 0,5 mm/min cross-speed. Data were statistically analysed by ANOVA test (a=0,05) and TUKEY, which had shown that the groups 3 and 4 (A110 without and with bevel, respectively) didn´t show any statistically signifi cant difference in relation to group 1 (sound teeth). Group 2 (prepared teeth) statistically showed signifi cant reduction in the fracture strength in relation to group 1 (sound teeth). The other groups 5, 6, 7 and 8 (Z250 and FLOW, without and with bevel, (respectively) had statistically presented signifi cant differences in relation to group 1 (sound teeth) and had not differed among themselves. Then, it was conclude that the microfi lled composite resin A110 was the only restorative material capable to return the fracture strength lost with the cervical preparation, becoming it similar to sound teeth, and the use of the bevel for cervical restorations did not show benefi ts in relation to the fracture strength.

Fábio Herrmann Coelho-de-Souza; Celso Afonso Klein Jr; Fabiana Papaleo; Juliana Deibler; Alcebiades Nunes Barbosa; Ricardo Prates Macedo

2008-01-01

284

Spiral CT in aplasia of the pre-renal inferior vena cava as a cause of phlebothrombosis from the femoral veins to the inferior vena cava  

International Nuclear Information System (INIS)

The case report focuses on the computed tomography of the thrombotic okklusion of the inferior vena cava, venae iliacae and femorales communes due to congenital interruption of the prerenal inferior vena cava. The embryology of the abnormality was discussed. (orig.).

1994-01-01

285

Determination of the molar concentration of messenger RNA  

International Nuclear Information System (INIS)

[en] Purification of messenger RNA and mRNA precursors with columns of oligo (dT)-cellulose or poly(U)-Sepharose results in a highly enriched but nevertheless impure population of polyadenylated molecules. Since the contaminating molecules, principally rRNA, are present in variable but often significant amounts, methods for quantifying the polyadenylated component are required. This chapter presents a technique for determining the mole fraction poly(A)+ RNA and its molar concentration in the presence of roughly equivalent amounts of poly(A)- RNA. The method consumes about 75-100 ng of total RNA and takes about 45 min to perform

1987-01-01

286

Tooth thickness at the furcation entrance of lower molars.  

UK PubMed Central (United Kingdom)

Better understanding of the furcation anatomy may serve to decrease the risk of pulpal injury during rotary odontoplasty, a procedure often used in conjunction with guided tissue regeneration. The purpose of this study was to determine (i) the tooth thickness about the furcation entrance of lower molars, and (ii) whether there is a relationship between tooth thickness and patient age. 40 mandibular 1st molars (M1) (mean age = 36.2; range 10-65 years) and 40 mandibular 2nd molars (M2) (mean age = 37.9; range 14-70 years) were collected. Age, gender and furcation involvement (if any) were noted for each tooth at the time of extraction. Teeth were sectioned in half, buccal-lingual, at the furcation entrance with a rotary diamond blade. A standardized linear reference scale was placed on each experimental section and an 8 x 10 in. photograph generated. The distance from the floor of the pulp chamber to 5 predetermined sites on the root surface was calculated. The data were expressed as (a) the mean of each site and (b) the mean of each tooth (the average of the 5 points of each tooth). Analysis of covariance failed to show a relationship between thickness measurements and gender or furcation involvement. Thus, the data was subjected to simple regression analysis to determine the relationship of age with tooth and cementum thickness. This study revealed that by site, the mean measurements ranged from 2.7-3.0 mm for both M1 and M2. The single least/greatest measurements of the 5 sites were for M1: 1.6/4.7 mm and for M2: 1.8/4.2 mm. By tooth, the average distance from the pulp to the root surface was 2.83 mm (+/- 0.49) for M1 and 2.88 mm (+/- 0.44) for M2. Regression analysis of tooth thickness with age was significant for M1 only. The maximum slope of the 5 sites was approximately 0.3 mm/10 years. No relationship was found between cementum thickness and age for either tooth group. The results of this study indicate that the majority of times the pulp is 1.6-4.2 mm from the root surface in the vicinity of the furcation entrance of lower 1st and 2nd molars. Although tooth thickness in this area may increase with age, the amount is not enough to forego judicious odontoplasty on older patients.

Sterrett JD; Pelletier H; Russell CM

1996-07-01

287

Unilateral single-rooted primary mandibular first molar.  

Science.gov (United States)

A 4-year-old boy reported food lodgement and pain in the lower left back tooth region. On examination, a deeply carious tooth with food lodgement was seen. On oral examination, numbers of teeth were found to be carious and required restorations and endodontic treatments according to radiographic evaluation. Radiograph of mandibular left first deciduous molar revealed an unusual morphology of root. It was single-rooted and presented with Vertucci's class I canal. The tooth was treated by pulpectomy followed by a stainless steel crown. All other carious teeth were treated as planned. PMID:23893279

Chaudhari, Purva; Mallikarjuna, Rachappa; Swadas, Milan; Dave, Bhavna

2013-07-26

288

Densities and excess molar volumes of alcohol + cyclohexylamine mixtures  

Directory of Open Access Journals (Sweden)

Full Text Available Densities of binary mixtures of 1-propanol, or 2-butanol, or 1-pentanol + cyclohexylamine were measured at temperatures from 288.15 to 313.15 K and atmospheric pressure, while the densities for the system 2-methyl-2-pro-panol + cyclohexylamine were measured at temperatures from 303.15 to 323.15 K and atmospheric pressure. All measurements were performed using an Anton Paar DMA 5000 digital vibrating-tube densimeter. From the experimental densities, the excess molar volumes, VE, were calculated.

IVONA R. RADOVI?; MIRJANA LJ. KIJEV?ANIN; ALEKSANDAR Ž. TASI?; BOJAN D. DJORDJEVI?; SLOBODAN P. ŠERBANOVI?

2009-01-01

289

Determination of the molar concentration of messenger RNA  

Energy Technology Data Exchange (ETDEWEB)

Purification of messenger RNA and mRNA precursors with columns of oligo (dT)-cellulose or poly(U)-Sepharose results in a highly enriched but nevertheless impure population of polyadenylated molecules. Since the contaminating molecules, principally rRNA, are present in variable but often significant amounts, methods for quantifying the polyadenylated component are required. This chapter presents a technique for determining the mole fraction poly(A)/sup +/ RNA and its molar concentration in the presence of roughly equivalent amounts of poly(A)/sup -/ RNA. The method consumes about 75-100 ng of total RNA and takes about 45 min to perform.

Krug, M.S.; Berger, S.L.

1987-01-01

290

Anesthetic management in thyroid crisis triggered by molar pregnancy  

Directory of Open Access Journals (Sweden)

Full Text Available Clinical thyrotoxicosis is one of the rare complications of molar pregnancy. The cause of the symptoms associated with hyperthyroidism in mol hydatiform is the thyrotrophic effects of high levels of ?-hCG. The hCG molecule consists of ? and ? subunits; the ? subunit is identical to TSH and the ? subunit has a similar structure to TSH. In this case report it was aimed to discuss the anesthetic management of a dilatation and curettage case in a patient with mol hydatiform and thyroid crisis. J Clin Exp Invest 2012; 3 (3): 433-434Key words: Hydatidiform mole, hyperthyroidism, anesthesia

Harun Aydo?an; ?aban Yalç?n; Ahmet Küçük; Hasan Hüsnü Yüce; Aysun Camuzcuzcuo?lu; Mehmet Ali Eren

2012-01-01

291

[Surgery of inferior vena cava-associated urological tumor lesions.  

UK PubMed Central (United Kingdom)

BACKGROUND: Tumor lesions of the inferior vena cava are extremely challenging with regard to adequate therapeutic management also in advanced malignant urological tumor lesions which can be caused by malignant adhesion, impression and tumor infiltration from the surrounding tissue. This can be the case with metastases from a seminoma or testicular carcinoma (differential diagnosis: primary vena cava leiomyosarcoma), tumor-associated growth into and within the inferior vena cava originating from renal cell carcinoma or carcinoma of the pararenal gland. The aim of this overview was to summarize current clinical and operative experiences in the treatment of inferior vena cava-associated urological tumor lesions, perioperative management, individual-specific and finding-adapted surgical technique and possible outcome, including prognostic considerations from clinical daily practice and representative data found in the literature. BASIC STATEMENTS: The primary aim of the surgical approach is to achieve R0 resection with reconstruction of the inferior vena cava lumen providing a reasonable risk-benefit ratio, which comprises i) complete resection and substitution of the inferior vena cava by a prosthesis along the previous extent of tumor growth, ii) partial resection of the vena cava wall with subsequent patch-plasty or tangential resection with primary suture or iii) removal of the vena cava thrombus after cavotomy. Particular attention should be paid to tumor thrombi reaching the right atrium which need to be extracted after sternotomy and atriotomy using an extracorporeal circulation (cardiac surgeon). For surgical planning, subdivision of the inferior vena cava into three segments, infracardiac, infrahepatic and infrarenal third, has been proven and tested. CONCLUSIONS: The current development status and advances in surgical approaches as well as advances in medical technology allow the successful approach to such advanced stage urological tumor manifestations. A deciding factor is the abdominal and cardiovascular surgical expertise of each surgeon after formation of a team of surgical specialists (including urologists) and only then prognostic advantages can be achieved.

Weber M; Meyer F; Liehr UB; Halloul Z

2013-08-01

292

The prevalence of bilateral three-rooted mandibular first molar in Indian population.  

UK PubMed Central (United Kingdom)

INTRODUCTION: The purpose of the present study was to evaluate the prevalence of bilateral three-rooted mandibular first and second molars in Indian population. MATERIALS AND METHODS: A total of 215 patients were screened bilaterally for mandibular first and second molar and 430 samples of periapical radiographs were obtained. The gender, symmetry, and prevalence of three-rooted mandibular first and second molars were recorded. The correlation between left and right side occurrences and distribution were recorded and analysed using Z-test. RESULTS: The results showed that 33 teeth had three-rooted mandibular first molars, 16 male and 17 female (P=0.442). Overall, 21 teeth of right jaw and 12 teeth of left jaw (P=0.103) showed presence of an extra-root. The prevalence of three-rooted mandibular first molars was 7.67% and second molar was 0.23%. The bilateral frequency distribution was 3.72% for the first molar. There was no statistically significant difference between right side and left side mandibular molars. Also, gender did not show a significant relationship with this variant. CONCLUSION: The endodontic treatments of first mandibular molars require a careful clinical approach in Indian population as a high racial prevalence of 7.67% three-rooted molars was found. However, in the same population, 0.23% mandibular second molars had three roots.

Karale R; Chikkamallaiah C; Hegde J; Aswathanarayana S; Santhosh L; Bashetty K; Rajanna Susheela S; Panchajanya S

2013-01-01

293

Assessment of the relationship between the maxillary molars and adjacent structures using cone beam computed tomography  

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This study investigated the relationship between the roots of the maxillary molars and the maxillary sinus using cone beam computed tomography (CBCT), and measured the distances between the roots of the maxillary molars and the sinus floor as well as the thickness of the bone between the root and the alveolar cortical plate. The study sample consisted of 83 patients with normally erupted bilateral maxillary first and second molars. A total of 332 maxillary molars were examined using CBCT images. The vertical relationship of each root with the maxillary sinus was classified into four types on CBCT cross-sectional images. The distance between the sinus floor and root and the bone thickness between the root and alveolar cortical plate were measured. In the buccal roots of the maxillary molars, a root protruding into the sinus occurred most frequently. A root projecting laterally along the sinus cavity was most common in the palatal roots of the maxillary first molars. The mesiobuccal roots of the maxillary second molar were closest to the sinus. The mesiobuccal roots of the first molars were closest to the cortical plate. The relationship between the roots of the maxillary molars and the sinus differed between the buccal and palatal roots. A root protruding into the sinus occurred more frequent in the buccal roots of the maxillary molars. The mesiobuccal root of the maxillary second molar was closest to the maxillary sinus floor and farthest from the alveolar cortical plate.

Jung, Yun Hoa; Cho, Bong Hae [Dept. of Oral and Maxillofacial Radiology, College of Dentistry, Pusan National University, Yangsan (Korea, Republic of)

2012-09-15

294

Bone lid technique with piezosurgery to preserve inferior alveolar nerve.  

Science.gov (United States)

The inferior alveolar nerve is at risk during surgical removal of impacted mandibular teeth and excision of benign tumors of mandible. Manual and/or mechanical instruments used in the close proximity of delicate structures do not allow the control of the cutting depth and can damage these structures by accidental contact. Piezoelectric surgery is a new and innovative bone surgery technique using the microvibrations of special scalpels at ultrasonic frequency so therefore soft tissue will not be damaged even upon accidental contact with the cutting tip. This article presents an alternative technique that uses piezoelectricity to minimize trauma to the inferior alveolar nerve, vascular tissues, or surrounding dental tissues. PMID:19913713

Degerliyurt, Kagan; Akar, Volkan; Denizci, Senem; Yucel, Ergun

2009-12-01

295

[Leiomyosarcoma of the inferior vena cava (case report)].  

UK PubMed Central (United Kingdom)

The occur of resecable retroperitoneal tumours invading into inferiér vena cava is rare. The authors report in detail a case of fibrosarcoma of the inferior vena cava In article is presented case of 49-year-old female presented with echographic and computed tomographic evidence of solid formation below porta hepatis and ower head of pankreas, behinde duodenum, growed into inferior vena cava with trombus. Treatment of the abdominal and retroperitoneal tumours closely related to major blood vessels must be interdisciplinary, considering diagnostics, operability estimation and additional measures. The radical resection rate for involving important vesel may bee improved with vascular technique.

Sváb J; Lindner J; Krska Z; Plocová K; Vondrácková M

2011-10-01

296

Pleomorphic adenoma originates from inferior nasal turbinate causing epiphora.  

Science.gov (United States)

Pleomorphic adenoma is the most common benign tumor of the salivary glands. A 62-year-old female patient presented with epiphora and was suffering from breathing difficulties. With the diagnostic nasal endoscopy, a mass, originating from right inferior nasal turbinate and filling the entire nasal cavity, was seen. Originating from the inferior nasal turbinate is a very rare entity. Paranasal sinus computed tomography and magnetic resonance images revealed a mass that fills and expands the right nasal cavity. Mass was hypoechoic in B-mode ultrasonography and hypovascular in color Doppler ultrasonography, and rate of tissue stiffness was high in sonoelastography. These were helpful for the diagnosis. PMID:23357689

Erol, Bekir; Selçuk, Ömer Tarik; Gürses, Cemil; Osma, Üstün; Köro?lu, Mert; Süren, Dinç

2013-01-26

297

Pleomorphic adenoma originates from inferior nasal turbinate causing epiphora.  

UK PubMed Central (United Kingdom)

Pleomorphic adenoma is the most common benign tumor of the salivary glands. A 62-year-old female patient presented with epiphora and was suffering from breathing difficulties. With the diagnostic nasal endoscopy, a mass, originating from right inferior nasal turbinate and filling the entire nasal cavity, was seen. Originating from the inferior nasal turbinate is a very rare entity. Paranasal sinus computed tomography and magnetic resonance images revealed a mass that fills and expands the right nasal cavity. Mass was hypoechoic in B-mode ultrasonography and hypovascular in color Doppler ultrasonography, and rate of tissue stiffness was high in sonoelastography. These were helpful for the diagnosis.

Erol B; Selçuk ÖT; Gürses C; Osma Ü; Köro?lu M; Süren D

2013-07-01

298

Immunocytochemical and molecular studies with primary cultures of molar tissue Estudio inmunocitoquímico y molecular de cultivo primario de tejido molar  

Directory of Open Access Journals (Sweden)

Full Text Available Introduction. Gestational trophoblastic disease includes a group of pathologies characterized by abnormal trophoblast growth and invasion. The molecular bases of the disease are largely unknown, due in part to the lack of appropriate biological models. The insulin-like growth factor (IGF) system plays a fundamental role in the growth and development of many tissues and is involved in the progression of several diseases.Objectives. Primary cell cultures derived from first trimester placenta were characterized from patients with complete hydatidiform mole and spontaneous non molar abortion by immunocytochemical and molecular methods. Materials and Methods. The immunocytochemical method used specific markers for trophoblastic cells, whereas RT-PCR was used to identify insulin-like growth factor gene expression.Results. Histochemical staining with hematoxilin-eosin revealed that the cultures contained heterogeneous cell types, including trophoblast and endometrial decidual cells. The ratio of trophoblast cells in the cultures varied between 16% and 37%, as detected by cytokeratine-7 as the specific trophoblast marker. Gene expression analysis corroborated the presence of trophoblasts by detecting insulin-like growth factor II mRNA, whereas GH-V transcripts were correlated with the presence of syncitiotrophoblasts. Insulin-like growth factor I and insulin-like growth factor binding protein 1 mRNAs were related to mesenchyimal and decidual cells, respectively. Higher insulin-like growth factor II expression levels were found in molar tissues in comparison with non-molar abortions.Conclusion. By combining three methodologies-morphology, immunocytochemistry and gene expression, characterization and follow-up of placenta cultures from abnormal tissues is found to facilitate diagnosis. Introducción. La enfermedad trofoblástica gestacional comprende un conjunto de patologías caracterizadas por crecimiento e invasión anómalos del trofoblasto. Las bases moleculares de esta patología son desconocidas, en parte por la dificultad para disponer de modelos biológicos adecuados. Se plantea que el sistema de factores de crecimiento similares a la insulina puede tener un papel fundamental en el desarrollo de la enfermedad.Objetivo. Caracterizar cultivos primarios de placentas de primer trimestre provenientes de pacientes con mola hidatidiforme completa y aborto espontáneo no molar mediante morfología, inmunocitoquímica y expresión diferencial de algunos genes del sistema de factores de crecimiento similares a la insulina.Materiales y métodos. Se empleó inmunocitoquímica para determinar células trofoblásticas y detección por transcripción reversa y reacción en cadena de la polimerasa de genes del sistema de factores de crecimiento similares a la insulina asociados al tipo celular.Resultados. La morfología evidenció heterogeneidad de los cultivos, incluidas células mesenquimales, trofoblásticas y de decidua. El contenido de células de trofoblasto con citoqueratina-7 (marcador específico) estuvo entre 16 y 37%. La expresión de genes corroboró la presencia de trofoblasto por medio del ARNm del factor II de crecimiento similar a la insulina, en tanto que los transcritos de la hormona de crecimiento variante evidenciaron la presencia de sincitiotrofoblasto. El factor I de crecimiento similar a la insulina y la proteína de unión tipo 1 se relacionaron con células mesenquimales y de decidua. Se observó una mayor expresión del factor II de crecimiento similar a la insulina en tejidos molares en comparación con aborto no molar.Conclusiones. Los resultados mostraron la utilidad de combinar tres metodologías, morfología, inmunocitoquímica y expresión de genes, como herramientas para la caracterización y seguimiento de cultivos placentarios a partir de muestras de tejidos a

Yinth Andrea Bernal; Luis Eduardo Díaz; Jinneth Acosta; Cecilia Crane; Stella Carrasco-Rodríguez; Antonio José Bermúdez; Myriam Sánchez-Gómez

2006-01-01

299

Estudio inmunocitoquímico y molecular de cultivo primario de tejido molar/ Immunocytochemical and molecular studies with primary cultures of molar tissue  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Introducción. La enfermedad trofoblástica gestacional comprende un conjunto de patologías caracterizadas por crecimiento e invasión anómalos del trofoblasto. Las bases moleculares de esta patología son desconocidas, en parte por la dificultad para disponer de modelos biológicos adecuados. Se plantea que el sistema de factores de crecimiento similares a la insulina puede tener un papel fundamental en el desarrollo de la enfermedad. Objetivo. Caracterizar cultivos pr (more) imarios de placentas de primer trimestre provenientes de pacientes con mola hidatidiforme completa y aborto espontáneo no molar mediante morfología, inmunocitoquímica y expresión diferencial de algunos genes del sistema de factores de crecimiento similares a la insulina. Materiales y métodos. Se empleó inmunocitoquímica para determinar células trofoblásticas y detección por transcripción reversa y reacción en cadena de la polimerasa de genes del sistema de factores de crecimiento similares a la insulina asociados al tipo celular. Resultados. La morfología evidenció heterogeneidad de los cultivos, incluidas células mesenquimales, trofoblásticas y de decidua. El contenido de células de trofoblasto con citoqueratina-7 (marcador específico) estuvo entre 16 y 37%. La expresión de genes corroboró la presencia de trofoblasto por medio del ARNm del factor II de crecimiento similar a la insulina, en tanto que los transcritos de la hormona de crecimiento variante evidenciaron la presencia de sincitiotrofoblasto. El factor I de crecimiento similar a la insulina y la proteína de unión tipo 1 se relacionaron con células mesenquimales y de decidua. Se observó una mayor expresión del factor II de crecimiento similar a la insulina en tejidos molares en comparación con aborto no molar. Conclusiones. Los resultados mostraron la utilidad de combinar tres metodologías, morfología, inmunocitoquímica y expresión de genes, como herramientas para la caracterización y seguimiento de cultivos placentarios a partir de muestras de tejidos anómalos complejos, facilitando así el diagnóstico. Abstract in english Introduction. Gestational trophoblastic disease includes a group of pathologies characterized by abnormal trophoblast growth and invasion. The molecular bases of the disease are largely unknown, due in part to the lack of appropriate biological models. The insulin-like growth factor (IGF) system plays a fundamental role in the growth and development of many tissues and is involved in the progression of several diseases. Objectives. Primary cell cultures derived from first (more) trimester placenta were characterized from patients with complete hydatidiform mole and spontaneous non molar abortion by immunocytochemical and molecular methods. Materials and Methods. The immunocytochemical method used specific markers for trophoblastic cells, whereas RT-PCR was used to identify insulin-like growth factor gene expression. Results. Histochemical staining with hematoxilin-eosin revealed that the cultures contained heterogeneous cell types, including trophoblast and endometrial decidual cells. The ratio of trophoblast cells in the cultures varied between 16% and 37%, as detected by cytokeratine-7 as the specific trophoblast marker. Gene expression analysis corroborated the presence of trophoblasts by detecting insulin-like growth factor II mRNA, whereas GH-V transcripts were correlated with the presence of syncitiotrophoblasts. Insulin-like growth factor I and insulin-like growth factor binding protein 1 mRNAs were related to mesenchyimal and decidual cells, respectively. Higher insulin-like growth factor II expression levels were found in molar tissues in comparison with non-molar abortions. Conclusion. By combining three methodologies-morphology, immunocytochemistry and gene expression, characterization and follow-up of placenta cultures from abnormal tissues is found to facilitate diagnosis.

Bernal, Yinth Andrea; Díaz, Luis Eduardo; Acosta, Jinneth; Crane, Cecilia; Carrasco-Rodríguez, Stella; Bermúdez, Antonio José; Sánchez-Gómez, Myriam

2006-12-01

300

A extração de segundos molares superiores para o tratamento da Classe II/ Extraction of upper second molars for treatment of Angle Class II malocclusion  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Este trabalho tem por objetivo apresentar uma abordagem alternativa para o tratamento ortodôntico das más oclusões de Classe II. Através de uma revisão da literatura, verificou-se que a extração de segundos molares superiores demonstrou ser uma alternativa viável para o tratamento desse tipo de má oclusão. Essa opção terapêutica possibilita maior rapidez na distalização dos primeiros molares com menor necessidade de cooperação por parte do paciente. Poré (more) m, a análise do grau de formação, posição intraóssea e morfologia do terceiro molar deve ser cuidadosamente realizada para proporcionar o correto posicionamento do mesmo no lugar do segundo molar extraído. Dois casos clínicos apresentarão a sequência do diagnóstico e tratamento com essa mecânica, exibindo resultados adequados dos pontos de vista funcional e estético. Abstract in english The purpose of this article is to present an alternative approach to the orthodontic treatment of Angle Class II malocclusion. According to a literature review it was observed that the extraction of upper second molars has proven to be a viable alternative for the treatment of this type of malocclusion. This therapeutic option enables faster first molar retraction and requires less patient compliance. However, the level of development, intraosseous position and morphology (more) of the third molar should be carefully evaluated to ensure its correct positioning in place of the extracted second molar. Two clinical case reports will demonstrate that the sequence of diagnosis and treatment used with this mechanics yields satisfactory functional and aesthetic results.

Mezomo, Maurício Barbieri; Pierret, Manon; Rosenbach, Gabriella; Tavares, Carlos Alberto E.

2010-06-01

 
 
 
 
301

Deuterium isotope effect on molar heat capacities and apparent molar heat capacities in dilute aqueous solutions: A multi-channel heat-flow microcalorimeter study  

Energy Technology Data Exchange (ETDEWEB)

The molar heat capacities of chloroform, dichloromethane, methanol, acetonitrile, acetone, dimethyl sulfoxide, benzene, dimethylformamide, toluene, and cyclohexane, as well as their deuterated isotopologues, were measured using a multi-channel heat conduction TAM (Thermal Activity Monitor) III microcalorimeter. In addition, the apparent molar heat capacities of some of the associated dilute aqueous solutions (0.0039 < solute mole fraction, x{sub i} < 0.0210) were also measured. A temperature drop method from (298.15 to 297.15) K at 0.1 MPa was employed. The corresponding heat capacities were determined from the integration of the measured heat flow. The heat capacity results are shown to be in good to very good agreement with the available literature values. In addition, good correlations were obtained for the effect of isotopic substitution on both molar heat capacity and apparent molar heat capacity in aqueous solutions. These correlations should be useful in the prediction of the molar heat capacities or the apparent molar heat capacities of other deuterated compounds. Since these measurements were conducted with ampoules, the effects of heat of condensation and/or vapor space on the accuracy of the heat capacity determinations are discussed. The overall results from this study demonstrate the utility of a multi-channel heat conduction microcalorimeter in obtaining good reproducibility and good accuracy for molar heat capacities as well as apparent molar heat capacities from simultaneous samples.

Tjahjono, Martin [Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A-STAR), 1 Pesek Road, Jurong Island, Singapore 627833 (Singapore)], E-mail: martin_tjahjono@ices.a-star.edu.sg; Garland, Marc [Institute of Chemical and Engineering Sciences, Agency for Science, Technology and Research (A-STAR), 1 Pesek Road, Jurong Island, Singapore 627833 (Singapore)

2008-11-15

302

Deuterium isotope effect on molar heat capacities and apparent molar heat capacities in dilute aqueous solutions: A multi-channel heat-flow microcalorimeter study  

International Nuclear Information System (INIS)

The molar heat capacities of chloroform, dichloromethane, methanol, acetonitrile, acetone, dimethyl sulfoxide, benzene, dimethylformamide, toluene, and cyclohexane, as well as their deuterated isotopologues, were measured using a multi-channel heat conduction TAM (Thermal Activity Monitor) III microcalorimeter. In addition, the apparent molar heat capacities of some of the associated dilute aqueous solutions (0.0039 i

2008-01-01

303

Lesiones quísticas asociadas a terceros molares retenidos que requirieron hospitalización  

Directory of Open Access Journals (Sweden)

Full Text Available Se realiza una investigación retrospectiva y descriptiva de 18 pacientes hospitalizados que recibieron tratamiento quirúrgico por presentar lesiones quísticas asociadas a un tercer molar retenido, con el objetivo de evaluar dichas lesiones durante el período 1985-1994. De los 18 pacientes 13 eran masculinos, la edad media fue de 33,7 años, 12 pacientes (66,7 %) fueron diagnosticados por exámenes radiológicos. La longitud media de la lesión fue de 39,8 mm, 3 pacientes presentaron signos clínicos de infección al ingreso. La longitud media de la lesión fue de 39,8 mm. Todos los quistes fueron tratados quirúrgicamente con una proporción de infección del 11,1 %.A retrospective and descriptive research was made in 18 in-patients underwent to surgical approach because of cystic injuries associated with a impacted third molar, to evaluate such injuries during period from 1985 to 1994. From among 18 patients, 13 were males, with a mean age of 33,7 years; 12 patients (66,7 %) were diagnosed by radiological examinations. Mean extent of injury was of 39,8 mm, 3 patients presenting clinical signs of infection in admission. All cysts were surgically removed with a infection ratio of 11,1 %.

Manuel Estrada Sarmiento

1998-01-01

304

Biometric study of furcation area of first maxillary molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese O presente estudo objetivo analisar biometricamente a distância das entradas das 3 bifurcações do primeiro molar superior até a respectiva raiz oposta e determinar o centro da trifurcação (CT), este o ponto eqüidistante da entrada de cada bifurcação. Trinta e cinco dentes livres de qualquer dano superficial e sem raízes fusionadas foram selecionados. As raízes foram incluídas em resina acrílica e seccionadas a partir da linha esmalte-cemento até a porção m (more) ais apical usando um disco de diamante. Fatias de 0,45 mm foram obtidas. Com o auxílio de um perfilômetro digital foram determinadas coordenadas de pontos num plano cartesiano. Isto permitiu o cálculo das distâncias desejadas utilizando fórmulas de geometria analítica. Após a análise estatística (Kruskal-Wallis ANOVA test, p Abstract in english The present investigation was designed to study the distance from the 3 bifurcation entrances to their opposite roots, and also the virtual center of the trifurcation (TC), which is equidistant from each bifurcation entrance, of maxillary molars. Thirty-five teeth devoid of any surface damage or fused roots were selected. Roots were included in acrylic resin and cross-sectioned at the cementoenamel junction to the apex using a rotary diamond blade and 0.45-mm slices were (more) obtained. A profile projector apparatus was used to obtain the coordinated points on a Cartesian plane, which allowed the calculation of all distances present using analytic geometric formulas. Based on statistical analysis (comparison by Kruskal-Wallis ANOVA test, p

Romito, Giuseppe Alexandre; Pustiglioni, Francisco Emílio

2004-01-01

305

Bacterial intensity and localization in primary molars with caries disease.  

UK PubMed Central (United Kingdom)

AIM: The aim was to assess the characteristics and outcomes of infections affecting the structures of carious primary molars. MATERIALS AND METHODS: Forty primary molars were used and classified according to the following clinical situation: With profound caries lesion, with bone loss at the furcation region, with perforation of the pulp chamber floor, and residual roots. The teeth were demineralized, cut, and stained with both haematoxylin-eosin and Brown and Brenn staining techniques. Assessment was performed using optical microscopy. RESULTS: Statistical analysis of the data by means of the Chi-square test suggests that there was a significant relationship (P<0.001) between the intensity and localization of infection and the level of destruction of dental structures. A significant difference was also observed in the intensity and localization of infection between the groups regarding crown, furca, and root (P<0.001). CONCLUSION: More intense and profound the infection, more severe is the dental destruction. The groups of residual roots showed the most severe bacterial infection compared to other groups.

Beltrame AP; Bolan M; Serratine AC; Rocha MJ

2012-01-01

306

Comparison of two implant-supported molar distalization systems.  

UK PubMed Central (United Kingdom)

OBJECTIVE: To examine skeletal, dental, and soft tissue effects of the Miniscrew Implant Supported Distalization System (MISDS) and the Bone-Anchored Pendulum Appliance (BAPA). MATERIALS AND METHODS: Among 28 patients displaying Angle Class II malocclusion, 14 patients with a mean age of 14.8 ± 3.6 years treated with MISDS were included in the first group, and 14 patients with a mean age of 14.5 ± 1.5 years treated with BAPA were included in the second group. The pretreatment and posttreatment lateral cephalograms were analyzed. Statistical evaluation was carried out using the paired Shapiro-Wilk test, the paired-sample t-test, and the unpaired t-test. RESULTS: Upper posterior teeth were distalized successfully in both groups. Nearly bodily distalization was seen in the MISDS group, whereas significant distal tipping of the upper first molars was observed in the BAPA group (P < .001). There were no statistically significant changes in the sagittal position of the maxilla and mandible and in the position of the upper incisors as a result of treatment in either group. CONCLUSIONS: Both methods provided absolute anchorage for distalization of posterior teeth; however, almost translatory distal movement was encountered in the MISDS group, and substantial distal tipping of the maxillary molars accompanied distalization in the BAPA group.

Sar C; Kaya B; Ozsoy O; Özcirpici AA

2013-05-01

307

The partial molar volumes of anesthetics in lipid bilayers.  

UK PubMed Central (United Kingdom)

The excess volumes of mixing of benzyl alcohol, halothane, and methoxyflurane in water and in suspensions of several lipid bilayers have been determined at 25 degrees C using a novel excess volume dilatometer. The excess volumes of mixing in water were all found to be negative, whereas in lipid suspensions they were all more positive than those in water alone. From known partition coefficients the partial molar volumes of these three solutes in the lipid bilayers were calculated. These values were all close to the molar volumes of the pure anesthetics, as was a value determined for halothane in olive oil. Halothane was studied in dipalmitoylphosphatidylcholine below its phase transition, and was found to exhibit a much larger excess volume than in any other system we studied. The potency of these three anesthetics was determined in tadpoles. It was calculated that at equi-anesthetic doses these three agents caused an expansion in egg lecithin/cholesterol (2:1) bilayers of 0.21 +/- 0.015%. This result is consistent with the hypothesis that general anesthetics act by expanding membranes.

Kita Y; Bennett LJ; Miller KW

1981-09-01

308

Standard molar enthalpies of formation of hydroxy-, chlor-, and bromapatite  

International Nuclear Information System (INIS)

[en] The standard (p0 =0.1MPa) molar enthalpies of formation in the crystalline state of hydroxyapatite, chlorapatite and a preliminary value for bromapatite, at T=298.15K, were determined by reaction-solution calorimetry as: ?fHm0 [Ca10(PO4)6(OH)2,cr]=-(13399+/-11)kJ.mol-1,?fHm0 [Ca10(PO4)6Cl2,cr]=-(13231+/-82)kJ.mol-1,and?fHm0 [Ca10(PO4)6Br2,cr]=-(13063+/-81)kJ.mol-1. A critical assessment of these results and of previously published data is made. Finally, the standard molar enthalpy of formation of iodapatite is estimated as ?fHm0 [Ca10(PO4)6I2,cr]=-12949kJ.mol-1, from a linear correlation of ?fHm0 [Ca10(PO4)6X2,cr] (X=OH, F, Cl, Br) against the corresponding ?fHm0 [CaX2,cr

2005-01-01

309

Mandibular lip bumper treatment and second molar eruption disturbances.  

UK PubMed Central (United Kingdom)

INTRODUCTION: Mandibular lip-bumper (LB) nonextraction treatment, usually started before complete second molar (M2) eruption, inevitably interacts with the development of the dentition. Yet, its effects on M2 eruption are still unknown. The first aim of this study was to retrospectively investigate whether LB therapy (260 patients) enhances the risk for M2 ectopic eruptions and impactions in comparison with 135 untreated subjects. The second aim was to assess, among treated patients (n = 197), the main potential determinants of M2 impaction and ectopic eruption. METHODS: M2 eruption and impaction were determined on panoramic radiographs. To assess the predictive role of M2 inclination in relation to the first molar, a panoramic radiograph suitable for this measurement before treatment was required. The data were analyzed by using software (version 8.2, SAS, Cary, NC). RESULTS: LB treatment significantly enhanced M2 impaction and ectopic eruption. Negative prognostic factors were found. An initial inclination of the M2 greater than 30° was significantly associated with a higher impaction risk compared with an angulation less than 10°. LB treatment duration longer than 2 years increased the risk of ectopic eruptions. CONCLUSIONS: While gaining space in the anterior arch, unwanted effects might be produced in the posterior arch. To be informed about these unplanned events is necessary to better optimize treatment.

Ferro F; Funiciello G; Perillo L; Chiodini P

2011-05-01

310

Molar absorptivities of beta-NADH and beta-NADPH.  

UK PubMed Central (United Kingdom)

Re-investigating the accuracy of the commonly used values for molar absorptivities (epsilon) of beta-NADH and beta-NADPH at Hg 334, Hg 365, or 340 nm, we obtained the following results: The maximum of absorbance of NADH is shifted from about 340 nm at 0 degrees C to about 338.5 nm at 38 degrees C; the corresponding maxima of NADPH are located at about 0.5-nm longer wavelengths. In addition, the absorption curves of both coenzymes broaden with increasing temperature. For these reasons, the epsilon-values of NADH and NADPH are generally different from each other, and are temperature-dependent. Only at 334 nm are they almost identical and nearly independent of temperature. Therefore this wavelength is recommended for precise measurements. The epsilon-values of these coenzymes are influenced by ionic strength and pH. To determine the absolute values of the molar absorptivities, we performed the glutamate dehydrogenase or lactate dehydrogenase assay with carefully purified 2-oxoglutaric acid or pyruvic acid in the presence of excess coenzyme. The purity of the substrates was checked through differential scanning calorimetry, moisture analysis, gas-liquid chromatography, gas chromatography in combination with mass spectrometry, and nuclear magnetic resonance spectroscopy. The epsilon-values observed under the various conditions are about 1-7% higher than those currently used.

Ziegenhorn J; Senn M; Bücher T

1976-02-01

311

Unilateral failure of development of mandibular premolars and molars in an Eastern Grey kangaroo (Macropus giganteus) and its effects on molar progression.  

UK PubMed Central (United Kingdom)

An adult male Eastern Grey kangaroo from a wildlife reserve near Melbourne was submitted for necropsy examination and was discovered to have abnormal dentition. There was no evidence that any premolars or molars had ever been present on the right mandible, whilst the incisors were normal. The age of the kangaroo was estimated to be 1 year 9 months using the right maxillary molars and 2 years 4 months old using the contralateral side, presumably due to the asymmetry of the dental arcades. 'Lumpy jaw', a common periodontal disease of kangaroos, from which Bacteroides sp was cultured, was present on the base of the vertical ramus of the left mandible. Complete unilateral absence of premolar and molar teeth in the mandible of a kangaroo has not been described. This condition affected molar progression in both sets of maxillary molars.

Barber D; Campbell J; Davey J; Luke T; Agren E; Beveridge I

2008-01-01

312

Unilateral failure of development of mandibular premolars and molars in an Eastern Grey kangaroo (Macropus giganteus) and its effects on molar progression.  

Science.gov (United States)

An adult male Eastern Grey kangaroo from a wildlife reserve near Melbourne was submitted for necropsy examination and was discovered to have abnormal dentition. There was no evidence that any premolars or molars had ever been present on the right mandible, whilst the incisors were normal. The age of the kangaroo was estimated to be 1 year 9 months using the right maxillary molars and 2 years 4 months old using the contralateral side, presumably due to the asymmetry of the dental arcades. 'Lumpy jaw', a common periodontal disease of kangaroos, from which Bacteroides sp was cultured, was present on the base of the vertical ramus of the left mandible. Complete unilateral absence of premolar and molar teeth in the mandible of a kangaroo has not been described. This condition affected molar progression in both sets of maxillary molars. PMID:18271832

Barber, D; Campbell, J; Davey, J; Luke, T; Agren, E; Beveridge, I

313

Quantitative pixel grey measurement of the "high-risk" sign, darkening of third molar roots: a pilot study.  

UK PubMed Central (United Kingdom)

OBJECTIVES: Our aim was to examine the panoramic darkening of the root, which is a "high-risk" sign, using quantitative measurements of pixel grey values to determine different aetiological backgrounds, namely inferior alveolar nerve (IAN) exposure with or without groove formation of the third molar roots or thinning/fenestration of the lingual cortex (LCTF). METHODS: 38 impacted third molars that had been surgically removed and had darkened roots on panoramic radiographs were included in this retrospective case-control study. 15 IAN exposure cases were selected for the case group, and 23 cases with proven lingual cortical thinning or fenestration were chosen for the control group. The mean pixel grey values of selected areas in the dark band (D) and control areas within the same roots (R) were determined with the ImageTool (University of Texas Health Science Center, San Antonio, TX) software. The differences in pixel values (R-D) of the IAN and LCTF groups were analysed using the Mann-Whitney U-test and Pearson's ?(2) test. RESULTS: The medians of the R-D pixel values were 45.7 in the IAN group and 34.3 in the LCTF group, whereas the interquartile ranges were 12.0 (IAN) and 18.3 (LCTF) (p < 0.001). The R-D critical value at which the outcomes differed significantly was 38. If the differences in pixel grey values (R-D) were higher than 38, the chance of IAN exposure was approximately 32 times higher than the chance of LCTF (?(2) test, p < 0.001; odds ratio, 32.0; 95% confidence interval, 3.5-293.1). CONCLUSIONS: The pre-operative prediction of IAN exposure or lingual cortical thinning in cases with "darkening" is possible based on pixel grey measurements of digital panoramic radiographs.

Szalma J; Bata Z; Lempel E; Jeges S; Olasz L

2013-01-01

314

[Resection of leiomyosarcoma of the inferior vena cava].  

UK PubMed Central (United Kingdom)

Experience in treatment of leiomyosarcoma of the retrohepatic segment of the inferior vena cava at any separately taken clinic is scarce. Given a rare nature of the pathology involved, whose diagnosis and management require joint participation of various-specialty physicians, we have considered it wise to present our own clinical case report.

Zotov SP; Pyshkin SA; Malyshev MIu; Safuanov AKh; Borovikov DA; Siniukov DM; Tereshin OS; Panov IO

2013-01-01

315

[Resection of leiomyosarcoma of the inferior vena cava].  

Science.gov (United States)

Experience in treatment of leiomyosarcoma of the retrohepatic segment of the inferior vena cava at any separately taken clinic is scarce. Given a rare nature of the pathology involved, whose diagnosis and management require joint participation of various-specialty physicians, we have considered it wise to present our own clinical case report. PMID:23531676

Zotov, S P; Pyshkin, S A; Malyshev, M Iu; Safuanov, A Kh; Borovikov, D A; Siniukov, D M; Tereshin, O S; Panov, I O

2013-01-01

316

ACUTE INFERIOR WALL MYOCARDIAL INFARCTION; FREQUENCY OF AV BLOCKS  

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Full Text Available Objective: The study was designed to see the frequency of atrioventricularblock in acute inferior wall myocardial infarction. Material & Methods: This study was carried inpatients admitted in Coronary Care Unit of Allied Hospital, Faisalabad and Divisional Head Quarters Hospital.Total no of patients were 100. All patients presented with severe chest pain of more than 30 minutes duration.Results: Total of 100 patients inferior wall MI were selected. 48 (48%) were male and 52(52%) were female.Age of patients ranged from 40-90 years with mean age of 57.85±9.29 years. Out of 100 patients, 70(70%) hadno AV block and 30(30%) had AV block. Among 30 cases 4(4%) had first degree AV block. Among 30 cases4(4%) had first degree AV block and 5(5%) had 2 nd degree AV block and 21(21%) had third degree AV block.Discussion: HB is more common with inferior than anterior wall MI because R. coronary A. supplies AV nodein addition to infero-basal part of left ventricle and because vagal reflex is more likely from this area.Conclusion: AV block was a frequent complication after acute inferior wall MI.

KHALID AMIN

2004-01-01

317

Inferior colliculus projections to pontine nuclei in guinea pig.  

UK PubMed Central (United Kingdom)

The present study examined the neural projection from the inferior colliculus to the pontine nuclei in guinea pig. This projection has been reported in other animals, and our goal was to establish the projection in guinea pig, a commonly used auditory model. Ultimately, we wanted to determine if the pontine nuclei could be a component of the descending auditory system from the inferior colliculus to the cochlear nucleus. The anterograde tracer Phaseolus vulgaris leucoagglutinin (PHA-L) was injected into one inferior colliculus of 10 animals and the pontine nuclei examined under a light microscope to detect PHA-L-labeled fibers. PHA-L-labeled fibers were observed in the ipsilateral pontine nuclei in 70% of the animals. While the majority of labeled fibers were smooth in appearance, a few fibers with en passant type varicosities (indicating synapses) were observed in the dorsolateral area of the pontine nuclei, adjacent to the lateral lemniscus. These findings do not support a robust projection from the inferior colliculus to the pontine nuclei in guinea pig. This is in opposition to findings in bat in which the projection may play a major role in modulating responses to sound.

Thompson AM

2006-07-01

318

Inferior colliculus projections to pontine nuclei in guinea pig.  

Science.gov (United States)

The present study examined the neural projection from the inferior colliculus to the pontine nuclei in guinea pig. This projection has been reported in other animals, and our goal was to establish the projection in guinea pig, a commonly used auditory model. Ultimately, we wanted to determine if the pontine nuclei could be a component of the descending auditory system from the inferior colliculus to the cochlear nucleus. The anterograde tracer Phaseolus vulgaris leucoagglutinin (PHA-L) was injected into one inferior colliculus of 10 animals and the pontine nuclei examined under a light microscope to detect PHA-L-labeled fibers. PHA-L-labeled fibers were observed in the ipsilateral pontine nuclei in 70% of the animals. While the majority of labeled fibers were smooth in appearance, a few fibers with en passant type varicosities (indicating synapses) were observed in the dorsolateral area of the pontine nuclei, adjacent to the lateral lemniscus. These findings do not support a robust projection from the inferior colliculus to the pontine nuclei in guinea pig. This is in opposition to findings in bat in which the projection may play a major role in modulating responses to sound. PMID:16769039

Thompson, Ann M

2006-06-12

319

Superior and Inferior Ophthalmic Veins Thrombosis with Cavernous Sinus Meningioma  

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Ophthalmic vein thrombosis is an extremely rare entity. We present a case of middle-aged female who presented with proptosis. Contrast-enhanced computed tomography and magnetic resonance imaging showed cavernous sinus meningioma with ipsilateral superior and inferior vein thrombosis. A brief review ...

Vyas, Sameer; Das, Palash Jyoti; Gupta, Sunil Kumar; Kakkar, Nandita; Khandelwal, Niranjan

320

Inferior vena cava obstruction presenting as an abdominal  

International Nuclear Information System (INIS)

Obstruction of the inferior vena cava (IVA) was observed as an abdominal mass on the plain radiograph in an asymptomatic patient. The obstruction had developed immediately below the renal veins, and markedly dilated varices were present. The appearance differed from that of the usual congenital caval variants and may have been the result of caval thrombosis in utero

1983-01-01

 
 
 
 
321

Inferior vena cava obstruction presenting as an abdominal mass.  

UK PubMed Central (United Kingdom)

Obstruction of the inferior vena cava (IVC) was observed as an abdominal mass on the plain radiograph in an asymptomatic patient. The obstruction had developed immediately below the renal veins, and markedly dilated varices were present. The appearance differed from that of the usual congenital caval variants and may have been the result of caval thrombosis in utero.

Voegeli DR; Lieberman RP; Yandow DR

1983-10-01

322

Pelvic Fascias and Inferior Hypogastric Plexus. Surgical and Anatomical Considerations.  

Directory of Open Access Journals (Sweden)

Full Text Available Iatrogenic lesions of the hypogastric Plexus are frequent, due to the fact that autonomic nerves are located on the lowest portion of the sacral vertebrae, and they are very difficult to locate and dissect during surgery. Three fresh cadavers were studied, 5 formolized. A fascia that is extended from one ureter to the other was found, which surrounds the genital vessels and the Superior Hypogastric Plexus. When it passes the sacral promontory it constitutes a frontal partition between the fascia recti and the sacrum, leaving the ureters laterally and the sympathetic plexus medially. It continues as to sagital partitions which leave outside the Inferior Hypogastric Plexus. The hypograstric plexus is conformed by the Hypogastric nerves, the Sacral Splanchnic nerves and the Pelvic Splanchnic nerves. It constitutes two parasagital partitions, which are divided into two groups of fibers: some posterior, which are distributed through the superior rectum, and some anterior, to the bladder, inferior rectum, prostate (or cervix), and erectile tissue. The previously mentioned approach the prostate from behind through its lateral inferior side, on 8:20 time, and enter the penis cell through the medium perineal aponeurosis, behind the membranous urethra. In spite of the difficulties of the identification of the Inferior Hypogastric Plexus during the surgical act, we believe that if dissection is made by maintaining integrity of these fascias, noble structures are respected even if they can’t be seen.

Vicente Mitidieri; Alejandro Mitidieri; Nahuel Paesano

2010-01-01

323

Osteochondrosis of the inferior pole of the scapula (Roca disease).  

UK PubMed Central (United Kingdom)

We report a rare case of osteochondrosis of the inferior pole of the scapula in a 14-year-old boy, an amateur swimmer, that was diagnosed by a combination of clinical and imaging findings. Also known as Roca disease, this is the first article to report this entity in the English literature and demonstrates its computerized tomography and MRI features.

Skaf A; Taneja AK

2013-07-01

324

Magnetic resonance venography of double inferior vena cava  

International Nuclear Information System (INIS)

Duplication of the inferior vena cava IVC is the most common anomaly affecting the vena cava. Variations of the IVC are diagnosed in routine dissection studies, in retroperitoneal surgeries, or in radiological studies for various reasons. In this paper, we present a case of double IVC with its magnetic resonance imaging findings. (author)

2005-01-01

325

Inferior turbinate surgery in children: a survey of practice patterns.  

UK PubMed Central (United Kingdom)

OBJECTIVES/HYPOTHESIS: A variety of techniques for inferior turbinate reduction have been used in children, but to date practice patterns have not been studied. The purpose of this survey was to study the practice of inferior turbinate surgery among pediatric otolaryngologists. STUDY DESIGN: Cross-sectional survey study. METHODS: A questionnaire was sent electronically to American Society of Pediatric Otolaryngologists members. RESULTS: A total of 249 questionnaires were sent, and 103 (41%) were completed. Six questionnaires were eliminated due to incompleteness. Seventy-nine (81%) respondents performed inferior turbinate surgery. The most common reason for not performing the procedure was lack of outcomes data. Coblation was the most common technique used in 51% of respondents. A change in surgical technique in the last 2 to 5 years, most commonly to coblation or microdebridement, was reported by 53% of respondents. Nasal obstruction was the primary indication for turbinate reduction (81%), followed by sleep-disordered breathing (16%). Respondents reported that 20% of turbinate reductions were sole procedures, and 80% were with other procedures: adenotonsillectomy, septoplasty, and sinus surgery. Fifty-six (71%) responders were either satisfied or very satisfied with the results of pediatric turbinate surgery. Failure of the procedure, epistaxis, and nasal crusting were commonly reported complications, and 9% reported major complications. CONCLUSIONS: A high proportion of pediatric otolaryngologists perform inferior turbinate surgery, most commonly for nasal obstruction. Coblation is the most common technique used, and complications are mostly minor. Physician satisfaction rates are high despite a paucity of outcomes data on the procedure.

Jiang ZY; Pereira KD; Friedman NR; Mitchell RB

2012-07-01

326

[Reduction of the inferior turbinates with a microdebrider].  

UK PubMed Central (United Kingdom)

OBJECTIVES: We evaluated the results of submucosal microdebrider turbinate reduction in patients with inferior turbinate hypertrophy. PATIENTS AND METHODS: The study included 503 patients (190 females, 313 males; mean age 28 years; range 18-68 years) who underwent turbinate reduction by a microdebrider for inferior turbinate hypertrophy. The inferior turbinates were examined by anterior rhinoscopy and nasal endoscopy before and three weeks after surgery and their size was graded from I to III. Preoperatively, 384 patients had grade II, 119 patients had grade III inferior turbinates. Of the study group, 116 patients completed a follow-up of two years. RESULTS: At three weeks after surgery, none of the patients had grade III turbinates; 435 patients and 68 patients were evaluated as grade I and II, respectively. At the end of two years, none had grade III turbinates; 76 patients were grade I, 40 patients were grade II. Complaints of nasal obstruction disappeared in three weeks in 95% of patients and it did not recur in all 116 patients at the end of two years. In the early postoperative period, crusting was not observed and recovery was quick. The most common complication was mucosal tears (n=114, 22.6%). Bleeding was seen in only one patient (0.2%). CONCLUSION: Submucosal microdebrider turbinate reduction is a safe alternative procedure and provides rapid healing with low complication rates, especially postoperative crusting.

Tanyeri H; Boyaci Z

2008-03-01

327

Inferior turbinectomy for nasal obstruction review of 75 cases  

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98% of the patients had improved airway after surgery.All the patients with hyposmia had increased sensitivity to smell following surgery.80% of the patients with asthma and hypertrophied inferior turbinates benefited considerably with surgery as they had marked reduction in the frequency of asthmat...

Mathai, John

328

Injuries of the retrohepatic inferior vena cava and the liver  

Directory of Open Access Journals (Sweden)

Full Text Available Beckground. Injuries of the retrohepatic inferior vena cava, and the liver have mortality rate up to 71-78%. We presented a patient with combined injury of the retrohepatic inferior vena cava, liver, craniocerebral and thoracic traumas, inflicted in a traffic accident. Case report. Man, 20 years old has been injured in a traffic accident. At admission, 20 minutes after the injury, the patient was comatose and hypotensive. Bloody content was obtained by abdominal tracer. The patient underwent emergent laparotomy, utilizing trifurcated incision and cell saver device. Abdominal exploration revealed two liters of free blood and massive retroperitoneal hematoma. Manual compression of the liver was done, as well as perihepatic packing, complete hepatic vascular exclusion and mobilization of the right liver lobe. Due to impressive chemodynamic instability supraceliac aortic clamping was performed. Upon exposure of the retrohepatic inferior vena cava and right liver lobe, multiple lacerations of retrohepatic inferior vena cava and right hepatic vein, and right hepatic vein avulsion were found. We also identified an injury of VII and VIII segments of the liver (grade V according to the Moore's classification). Nonexpansive hepatoduodenal ligament hematoma and the injury of II and III segments of the liver group II/III according to Moore were found. Venorrhaphy of the inferior vena cava was done in the area of circumference of the right hepatic vein, a portion of which served as autologous vein patch. Continuous prolene 3/0 venorrhaphy of the distal caval laceration was done. Total caval and aorta clamping time of the inferior vena cava was 41 minutes. Atypical resection, debridment, of hepatic segments was done by using a harmonic scalpel. Hepatoduodenal ligament was declamped after 65 minutes. Fibrin glue was applied on the resectioned area of liver. The patient received 3.2 l of autologuos blood transfusion with 5 units of packed red blood cells, 6 units of fresh frozen plasma, 13 units of concentrated thrombocytes and 15 units of cryoprecipitates. Due to coagulopathy, factor rVIIa was administered. Bilateral toracal drainage was done. Small bilateral contusions of the frontal part of the brain were noticed but the patient successfully recovered and was dismissed after three weeks. Conclusion. Combined injuries of the inferior vena cava and the liver befall into the most complex vascular traumas, thus representing a challenge for any complete medical team to manage them. The patient presented in our study was urgently transported to the hospital, immediately operated on applying modern doctrines of anesthesiology, transfusiology and vascular surgery that, all together, resulted into favorable treatment outcome with no distant complications.

Koprivica Radenko; Cvijovi? Radiša; Koprivica Ranka; Smiljani? Radmila

2008-01-01

329

Effect of sodium hypochlorite and edta irrigation, individually and in alternation, on dentin microhardness at the furcation area of mandibular molars  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese A proposta desse estudo foi avaliar o efeito do NaOCl 1% e do ácido etilenodiaminotetracético 17% (EDTA), de forma isolada e alternada, sobre a microdureza dentinária da região da furca de molares inferiores. A superfície oclusal e as raízes de vinte molares inferiores, recém extraídos, foram cortadas transversalmente e descartadas. Os espécimes foram distribuídos em 4 grupos (n=5) de acordo com a solução irrigante utilizada. As soluções empregadas foram EDT (more) A 17% (I), NaOCl 1% (II), NaOCl 1% e EDTA 17% (III), e água destilada (IV) (controle). Os dentes foram incluídos em blocos de resina acrílica e cortados transversalmente. A hemi-secção que melhor representou a furca dental foi lixada e polida para a avaliação da microdureza Knoop. As medidas obtidas foram analisadas utilizando-se teste ANOVA seguido do teste de comparação múltipla de Tukey (?=0,05). Os resultados desse estudo mostraram que todas as soluções, exceto o grupo controle, diminuíram a microdureza dentinária. O EDTA não apresentou diferença estatística significante em relação ao NaOCl/EDTA (p>0,05), mas foi diferente do NaOCl (p Abstract in english The aim of this study was to evaluate the effect of irrigation regimens on dentin microhardness at the furcation area of mandibular molars, using sodium hypochlorite and ethylenediaminetetraacetic acid (EDTA), individually and in alternation. The occlusal surface and the roots of 20 non-carious extracted human permanent mandibular molars were cut transversally and discarded. The tooth blocks were embedded in acrylic resin and randomly assigned to 4 groups (n=5) according (more) to the irrigating regimens: 1% NaOCl solution, 17% EDTA solution, 1% NaOCl and 17% EDTA and distilled water (control). Knoop microhardness of dentin at the furcation area was evaluated. Data were analyzed using one-way ANOVA and Tukey's multiple comparison tests (?=0.05). The results of this study indicated that all irrigation solutions, except for distilled water (control), decreased dentin microhardness. EDTA did not show a significant difference with NaOCl/EDTA (p>0.05), but showed a significant difference with NaOCl (p

Zaparolli, Danilo; Saquy, Paulo César; Cruz-Filho, Antonio Miranda

2012-01-01

330

An Evidenced Based Scoring System to Determine the Periodontal Prognosis on Molars.  

Science.gov (United States)

Background: This retrospective study evaluated and assigned scores to six prognostic factors and derived a quantitative scoring system used to determine the periodontal prognosis on molar teeth. Methods: Data were gathered on 816 molars in 102 patients with moderate to severe periodontitis. The six factors evaluated, age, probing depth, mobility, furcation involvement, smoking, and molar type, were assigned a numerical score based on statistical analysis. The sum of the scores for all factors was used to determine the prognosis score for each molar. Only patients with all first and second molars at the initial examination qualified for the study. All patients were a minimum of 15 years post treatment. Results: The post treatment time ranged from 15 to 40 years and averaged 24 years. When the study was completed, 639 molars survived (78%), and of those surviving molars, 566 survived in health (89%). In molars with lower scores (1,2,and 3) the 15-year survival rates ranged from 99% to 96%. For scores 4, 5, 6 the 15 year survival rates ranged was 95% to 90% and for molars with scores of 7, 8, 9, and 10 the survival rates ranged from 86% to 67%. Conclusions: Our results indicate that the periodontal prognosis on molars diagnosed with moderate to severe periodontitis can be calculated using an evidence-based scoring system. PMID:23725028

Miller, Preston D; McEntire, Mark L; Marlow, Nicole M; Gellin, Robert G

2013-05-31

331

An Evidenced Based Scoring System to Determine the Periodontal Prognosis on Molars.  

UK PubMed Central (United Kingdom)

Background: This retrospective study evaluated and assigned scores to six prognostic factors and derived a quantitative scoring system used to determine the periodontal prognosis on molar teeth. Methods: Data were gathered on 816 molars in 102 patients with moderate to severe periodontitis. The six factors evaluated, age, probing depth, mobility, furcation involvement, smoking, and molar type, were assigned a numerical score based on statistical analysis. The sum of the scores for all factors was used to determine the prognosis score for each molar. Only patients with all first and second molars at the initial examination qualified for the study. All patients were a minimum of 15 years post treatment. Results: The post treatment time ranged from 15 to 40 years and averaged 24 years. When the study was completed, 639 molars survived (78%), and of those surviving molars, 566 survived in health (89%). In molars with lower scores (1,2,and 3) the 15-year survival rates ranged from 99% to 96%. For scores 4, 5, 6 the 15 year survival rates ranged was 95% to 90% and for molars with scores of 7, 8, 9, and 10 the survival rates ranged from 86% to 67%. Conclusions: Our results indicate that the periodontal prognosis on molars diagnosed with moderate to severe periodontitis can be calculated using an evidence-based scoring system.

Miller PD Jr; McEntire ML; Marlow NM; Gellin RG

2013-05-01

332

Removable partial denture with molar uprighting spring: an innovative hybrid appliance.  

UK PubMed Central (United Kingdom)

PATIENT: A 45-year-old female patient with need of fixed replacement of her missing teeth which were lost long time before. Posterior teeth were severally tipped bilaterally in the edentulous space. Hybrid removable partial denture with molar uprighting spring was fabricated for molar uprighting on both side tilted molars. After 3 month and 15 days of treatment with hybrid appliance the molar abutment were uprighted for fabrication of fixed partial dentures. DISCUSSION: The objective in molar uprighting is ideal positioning of the molar which will eventually become an abutment tooth for a fixed prosthesis. The ideal position will provide an optimal periodontal environment for the molar. The prosthodontic advantages of molar uprighting via distal tipping include an improved line-of-draw if a FPD is being constructed. Concept of designing of appliances was based on our basic knowledge of forces for uprighting the tooth along with maintaining the function during the treatment period. Another advantage of this appliance was that it prevented supra eruption of opposing teeth during the period when the molar was being uprighted. CONCLUSION: Uprighting of tilted molar is extremely beneficial for long term success of fixed denture prosthesis by using hybrid appliances in very short period of treatment without hampering the function of the patient during the treatment period which is very economical as well.

Rao J; Singh GK; Alvi HA; Kumar L; Agrawal KK

2013-01-01

333

Consideraciones restauradoras y periodontales de molares tratados con resección radicular Restoration and periodontal considerations of resectioned molar teeth  

Directory of Open Access Journals (Sweden)

Full Text Available La restauración de molares sometidos a resección radicular debe realizarse cuidadosa y apropiadamente. Los problemas que pueden aparecer cuando la terapia restauradora no es llevada a cabo adecuadamente incluyen problemas de retención, excesiva debilidad de la estructura radicular e incompleto sellado marginal. La cirugía preprotésica es una fase importante de este proceso y aun cuando la reparación tisular ocurre 6 u 8 semanas después del corte, se pueden evaluar diferentes tipos de restauraciones de acuerdo al entorno periodontal, sin embargo, su pronóstico a largo plazo es incierto. Los estudios clínicos indican que los principales fracasos son de origen periodontal, endodóntico y biomecánico.Great care should be taken in properly restoring molars that have undergone root resection surgery. Problems that can arise when reconstructive treatment is not correctly carried out comprise faulty retention, excessive weakening of root structure, incomplete marginal seal. Preprothesic surgery is a particularly important step of the process and although tissue repair occurs 6 to 8 weeks after coronoradicular resection, different types of prostheses can be evaluated according to the periodontal environment. The long-term prognosis for this type of restoration is uncertain. Clinical studies indicate that the main sources of failure are periodontal, endodontic, and biomechanical.

J.C. Cuartas Ramírez; C.M. Ardila Medina

2010-01-01

334

Consideraciones restauradoras y periodontales de molares tratados con resección radicular/ Restoration and periodontal considerations of resectioned molar teeth  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish La restauración de molares sometidos a resección radicular debe realizarse cuidadosa y apropiadamente. Los problemas que pueden aparecer cuando la terapia restauradora no es llevada a cabo adecuadamente incluyen problemas de retención, excesiva debilidad de la estructura radicular e incompleto sellado marginal. La cirugía preprotésica es una fase importante de este proceso y aun cuando la reparación tisular ocurre 6 u 8 semanas después del corte, se pueden evaluar (more) diferentes tipos de restauraciones de acuerdo al entorno periodontal, sin embargo, su pronóstico a largo plazo es incierto. Los estudios clínicos indican que los principales fracasos son de origen periodontal, endodóntico y biomecánico. Abstract in english Great care should be taken in properly restoring molars that have undergone root resection surgery. Problems that can arise when reconstructive treatment is not correctly carried out comprise faulty retention, excessive weakening of root structure, incomplete marginal seal. Preprothesic surgery is a particularly important step of the process and although tissue repair occurs 6 to 8 weeks after coronoradicular resection, different types of prostheses can be evaluated accor (more) ding to the periodontal environment. The long-term prognosis for this type of restoration is uncertain. Clinical studies indicate that the main sources of failure are periodontal, endodontic, and biomechanical.

Cuartas Ramírez, J.C.; Ardila Medina, C.M.

2010-12-01

335

Pendulum: distalização do molar com simplicidade na confecção e utilização/ Pendulum: molar distalization with simplicity on its making and utilization  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese Durante muito tempo, a correção da Classe II baseava-se no uso de ancoragem extrabucal. Atualmente, inúmeros dispositivos trazem a possibilidade de distalização dos molares permanentes superiores, dentre estes o aparelho pêndulo preconizado por Hilgers o qual requer um mínimo de cooperação do paciente, considerando-se que a falta de colaboração poderá levar ao fracasso o mais bem elaborado plano de tratamento. O objetivo deste trabalho é descrever as características, confecção e indicações do Pêndulo, contando com a ilustração de casos clínicos. Abstract in english Over the time, the correction of Class II has been based on the use of anchorage extraoral traction with the headgear. Nowadays, many devices have been used to give the possibility of distalization of the maxillary permanents molars. One of these devices is the , appliance Pendulum suggested by Hilgers. This device also requires a minimum of the patient's cooperation; considering that the lack of the patient's cooperation can compromise the careful elaborated treatment pl (more) an. The aim of work is to describe the characteristic, the way of making and the indication of the Pendulum, based on case illustrations practices medicine.

Leiros, Mêrian Lucena M.; Pinto, Leão Pereira

2004-08-01

336

Pendulum: distalização do molar com simplicidade na confecção e utilização Pendulum: molar distalization with simplicity on its making and utilization  

Directory of Open Access Journals (Sweden)

Full Text Available Durante muito tempo, a correção da Classe II baseava-se no uso de ancoragem extrabucal. Atualmente, inúmeros dispositivos trazem a possibilidade de distalização dos molares permanentes superiores, dentre estes o aparelho pêndulo preconizado por Hilgers o qual requer um mínimo de cooperação do paciente, considerando-se que a falta de colaboração poderá levar ao fracasso o mais bem elaborado plano de tratamento. O objetivo deste trabalho é descrever as características, confecção e indicações do Pêndulo, contando com a ilustração de casos clínicos.Over the time, the correction of Class II has been based on the use of anchorage extraoral traction with the headgear. Nowadays, many devices have been used to give the possibility of distalization of the maxillary permanents molars. One of these devices is the , appliance Pendulum suggested by Hilgers. This device also requires a minimum of the patient's cooperation; considering that the lack of the patient's cooperation can compromise the careful elaborated treatment plan. The aim of work is to describe the characteristic, the way of making and the indication of the Pendulum, based on case illustrations practices medicine.

Mêrian Lucena M. Leiros; Leão Pereira Pinto

2004-01-01

337

Inferior Turbinoplasty During Cosmetic Rhinoplasty: Techniques and Trends.  

UK PubMed Central (United Kingdom)

BACKGROUND: The sheer number of accepted inferior turbinoplasty techniques emphasizes the fact that there is no general agreement on which approach yields optimal results, nor are there data available that describes prevalent techniques in turbinate surgery among plastic surgeons. OBJECTIVE: The aim of this study was to identify practice patterns among plastic surgeons who perform inferior turbinoplasty during rhinoplasty. METHODS: Members of the American Society of Plastic Surgeons were invited to participate in an anonymous, Internet-based survey containing questions related to personal preferences and outcomes in inferior turbinate surgery. RESULTS: A total of 534 members of the American Society of Plastic Surgeons participated in the survey. Most (71.7%) trained in an independent plastic surgery program with prerequisite training in general surgery. More than half (50.6%) had more than 20 years of operative experience; only 15.2% reported performing greater than 40 rhinoplasties per year. The 5 most preferred inferior turbinate reduction techniques were outfracture of the turbinates (49.1%), partial turbinectomy (33.3%), submucous reduction via electrocautery (25.3%), submucous resection (23.6%), and electrocautery (22.5%). Fewer than 10% of the respondents reported the use of newer techniques such as radiofrequency thermal ablation (5.6%), use of the microdebrider (2.2%), laser cautery (1.1%), or cryosurgery (0.6%). Mucosal crusting and desiccation were the most frequently reported complications. CONCLUSIONS: The results of this survey provide insights into the current preferences in inferior turbinate reduction surgery. Plastic surgeons are performing more conventional methods of turbinate reduction rather than taking advantage of the many of the more novel technology-driven methods.

Tanna N; Im DD; Azhar H; Roostaeian J; Lesavoy MA; Bradley JP; Jarrahy R

2012-12-01

338

Inferior Turbinoplasty During Cosmetic Rhinoplasty: Techniques and Trends.  

Science.gov (United States)

BACKGROUND: The sheer number of accepted inferior turbinoplasty techniques emphasizes the fact that there is no general agreement on which approach yields optimal results, nor are there data available that describes prevalent techniques in turbinate surgery among plastic surgeons. OBJECTIVE: The aim of this study was to identify practice patterns among plastic surgeons who perform inferior turbinoplasty during rhinoplasty. METHODS: Members of the American Society of Plastic Surgeons were invited to participate in an anonymous, Internet-based survey containing questions related to personal preferences and outcomes in inferior turbinate surgery. RESULTS: A total of 534 members of the American Society of Plastic Surgeons participated in the survey. Most (71.7%) trained in an independent plastic surgery program with prerequisite training in general surgery. More than half (50.6%) had more than 20 years of operative experience; only 15.2% reported performing greater than 40 rhinoplasties per year. The 5 most preferred inferior turbinate reduction techniques were outfracture of the turbinates (49.1%), partial turbinectomy (33.3%), submucous reduction via electrocautery (25.3%), submucous resection (23.6%), and electrocautery (22.5%). Fewer than 10% of the respondents reported the use of newer techniques such as radiofrequency thermal ablation (5.6%), use of the microdebrider (2.2%), laser cautery (1.1%), or cryosurgery (0.6%). Mucosal crusting and desiccation were the most frequently reported complications. CONCLUSIONS: The results of this survey provide insights into the current preferences in inferior turbinate reduction surgery. Plastic surgeons are performing more conventional methods of turbinate reduction rather than taking advantage of the many of the more novel technology-driven methods. PMID:23241771

Tanna, Neil; Im, Daniel D; Azhar, Hamdan; Roostaeian, Jason; Lesavoy, Malcolm A; Bradley, James P; Jarrahy, Reza

2012-12-13

339

Virtual prototyping of adhesively restored, endodontically treated molars.  

UK PubMed Central (United Kingdom)

STATEMENT OF PROBLEM: Teeth and dental restorations are difficult to model because of their complex anatomical shape and layered structure. PURPOSE: The purpose of this investigation was to describe the use of an efficient virtual prototyping method for the comparison of bonded porcelain and composite resin onlays to restore endodontically treated molars. MATERIAL AND METHODS: An intact mandibular molar was digitized with a micro-CT scanner. Surface contours of enamel and dentin were fitted following tooth segmentation based on pixel density using an interactive medical image processing software (Mimics). Standard triangle language files of enamel and dentin surfaces were then exported to a design and meshing software (3-matic). The root filling, base material, and a 3.0-mm-thick onlay were created by merging primitive shapes. Surface splitting, removal of unwanted surfaces, and remeshing allowed generation of an assembly with optimized interfacial mesh congruence and T-junctions. Solid 3-dimensional (3-D) models obtained in a finite element software (Marc/Mentat) were subjected to nonlinear contact analysis to simulate occlusal loading at 200 N and 700 N. Maximum principal stress values were used to calculate the risk of fracture and for validation with existing experimental data. RESULTS: There were similar stress distributions at 200 N (maximum peak values of 24 to 26 MPa) for both restorative materials, but marked differences at 700 N, with the porcelain onlay showing occlusal stress peaks more than 30% higher than composite resin. High stress concentrations were found at 700 N at the root level of the porcelain-restored tooth (95 MPa). For the composite resin onlay, secondary peaks of stress at the 700-N load were found above the cemento-enamel junction (47 MPa) with only minor effects at the root. The risk of fracture was increased for porcelain onlays, which correlated with the existing validation data and the decreased risk of fracture below the cemento-enamel junction (CEJ) observed for composite resin onlays. CONCLUSIONS: The virtual prototyping method can generate detailed and valid 3-D finite element models of a restored, endodontically treated molar. The decreased risk of fracture and more favorable stress distribution of adhesive composite resin onlays compared to porcelain onlays were confirmed. This method is efficient and may be used for other medical and dental applications.

Magne P

2010-06-01

340

Comparison of two needle models in terms of bevel deformation during truncal block of the inferior alveolar nerve  

Scientific Electronic Library Online (English)

Full Text Available Abstract in spanish Objetivos: Evaluar las posibles diferencias existentes en cuanto a la deformación del bisel de dos tipos de aguja de igual longitud y calibre externo, pero de distinto diámetro interno, durante el bloqueo troncal del nervio dentario inferior. Diseño del estudio: Cuatro operadores de similar formación quirúrgica realizaron el bloqueo troncal del nervio dentario inferior y la anestesia infiltrativa del nervio bucal para proceder a la extracción quirúrgica o convencio (more) nal del tercer molar inferior en 266 pacientes. Para efectuar el bloqueo troncal se utilizó en todos los casos un sistema de jeringa no auto-aspirante (Uniject K®; Hoechst AG, Frankfurt, Alemania) y dos tipos de aguja: una aguja Monoprotect® de 27G x 35 mm con un calibre interno de 0.215 mm (Sofic SA, Mazamet, Francia) o una aguja XL Monoprotect® de 27G x 35 mm con un calibre interno de 0.265 mm (Sofic SA, Mazamet, Francia). Para hacer la anestesia infiltrativa del nervio bucal se utilizó el mismo tipo de jeringa y otros dos tipos de aguja: la Monoprotect®o la XL Monoprotect®, ambas con un calibre de 30G y 25 mm de longitud, diferenciándose en su calibre interno (0.215 y 0.265 mm, respectivamente) (Sofic SA, Mazamet, Francia). En cada paciente fue recopilada de forma sistemática la siguiente información: el tipo de aguja, la técnica anestésica utilizada (troncular directa o indirecta) y el número de veces que se había contactado con el hueso durante ésta, el lado de trabajo del operador, el lado del diente a extraer, el operador que hizo la intervención quirúrgica, así como la presencia o ausencia de deformación del bisel tras la técnica anestésica. Resultados: Para la técnica troncular, sólo se observó una asociación estadísticamente significativa entre la deformación de los biseles de las agujas y el operador que efectuó la técnica anestésica, mientras que para la técnica infiltrativa, se encontró una asociación estadísticamente significativa (p Abstract in english Objectives: To evaluate the differences in terms of bevel deformation between two types of needle of the same length and external caliber, but with different internal diameters, during truncal block of the inferior alveolar nerve. Study design: Four operators performed truncal block of the inferior alveolar nerve and infiltrating anesthesia of the buccal nerve for the extraction of a lower third molar in 266 patients. The truncal block was carried out using a standard 27G (more) x 35 mm needle with an internal caliber of 0.215 mm, or a 27G x 35 mm XL Monoprotect® needle with an internal caliber of 0.265 mm. The infiltrating anesthesia was made with a Monoprotect® or XL Monoprotect® needle, both with a caliber of 30G and a length of 25 mm, but with different internal calibers (0.215 and 0.265 mm, respectively). The type of needle used, the anesthetic technique and the number of bone contacts was established during the procedure, the operator working side, the side of the tooth to be removed, the operator in charge of the intervention and the presence of bevel deformation after the anesthetic technique were collected for each patient. Results: A statistically significant association was observed between bevel deformation and the operator performing the truncal block, while a statistically significant association (p

Almendros Marqués, Nieves; Delgado Molina, Esther; Tamarit Borrás, Meritxell; Berini Aytés, Leonardo; Gay Escoda, Cosme

2007-08-01

 
 
 
 
341

Stability of molar relationship after non-extraction Class II malocclusion treatment  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese OBJETIVO: esse estudo objetivou avaliar a estabilidade da relação molar na má oclusão de Classe II tratada ortodonticamente sem extrações, visando quantificar a recidiva e correlacioná-la a alguns fatores. MÉTODOS: a amostra constituiu-se de 39 indivíduos (16 mulheres e 23 homens) com má oclusão de Classe II tratada sem extrações, com aparelhos fixos. A idade inicial média foi de 12,94 anos; na fase final, foi de 15,14 anos; na pós-contenção, 21,18 anos. (more) A média do tempo de tratamento foi de 2,19 anos e do tempo de avaliação pós-tratamento, de 6,12 anos. Para verificar a influência da severidade da relação molar de Classe II inicial na estabilidade da relação molar, a amostra foi dividida em dois grupos, um apresentando relação molar de ½ Classe II ou ¾ de Classe II, e outro apresentando relação molar de Classe II completa. Nos modelos de estudo das três fases estudadas, foram medidas a relação molar, as relações de primeiros e segundos pré-molares e de caninos. Os dados foram analisados pelos testes ANOVA dependente, de Tukey, correlação de Pearson e teste t independente entre dois grupos, divididos pela severidade da relação molar inicial. RESULTADOS: houve recidiva não significativa de 0,12mm na relação molar. A severidade inicial da relação molar de Classe II não se correlacionou com a recidiva no período pós-contenção. Quando a amostra dividiu-se em dois grupos, nenhuma diferença foi encontrada na recidiva da relação molar. CONCLUSÃO: a correção da relação molar de Classe II é estável e a severidade inicial não exerce influência sobre a recidiva da relação molar. Abstract in english OBJECTIVE: This study aimed to evaluate the stability of molar relationship after non-extraction treatment of Class II malocclusion. METHODS: The sample comprised 39 subjects (16 females, 23 males) with initial Class II malocclusion treated with no extractions, using fixed appliances. Mean age at the beginning of treatment was 12.94 years, at the end of treatment was 15.14 years and at post-retention stage was 21.18 years. Mean treatment time was 2.19 years and mean time (more) of post-treatment evaluation was 6.12 years. To verify the influence of the severity of initial Class II molar relationship in stability of molar relationship, the sample was divided into two groups, one presenting a ½-cusp or ¾-cusp Class II molar relationship, and the other with full-cusp Class II molar relationship. In dental casts from initial, final and postretention stages, molar, first and second premolars and canine relationships were measured. Data obtained were analyzed by dependent ANOVA, Tukey and Pearson's correlation tests, as well as independent t test between the two groups divided by severity of initial molar relationship. RESULTS: There was a non-statistically significant 0.12 mm relapse of molar relationship. The initial severity of Class II molar relationship was not correlated to relapse in the post-retention period. When compared, the two groups showed no difference in relapse of molar relationship. CONCLUSION: It was concluded that correction of Class II molar relationship is stable and initial severity does not influence relapse of molar relationship.

Lima, Darwin Vaz de; Freitas, Karina Maria Salvatore de; Freitas, Marcos Roberto de; Janson, Guilherme; Henriques, José Fernando Castanha; Pinzan, Arnaldo

2013-04-01

342

Estudo clínico e ultraestrutural pós-turbinectomia inferior parcial/ Clinical and ultrastructural study after partial inferior turbinectomy  

Scientific Electronic Library Online (English)

Full Text Available Abstract in portuguese O presente trabalho refere-se ao estudo dos resultados clínicos e histológicos obtidos após a turbinectomia inferior parcial (TIP), cirurgia indicada no tratamento da obstrução nasal crônica causada pela hipertrofia das conchas nasais inferiores. MATERIAL E MÉTODOS: Foram estudados vinte pacientes, divididos em dois grupos de dez cada (grupos A e B), submetidos à TIP, associada à septoplastia ou não. Os pacientes foram reavaliados clinicamente e histologicamente (more) (com biópsia das áreas regeneradas das conchas inferiores), em dois períodos pós-operatórios diferentes: um grupo após oito a doze meses (grupo A) e outro após dois anos de TIP (grupo B). RESULTADOS: Os resultados clínicos mostraram-se satisfatórios para o alívio da obstrução nasal no grupo A, e insatisfatórios no grupo B. Entretanto, melhores resultados histológicos, com maior recuperação e diferenciação epitelial da mucosa regenerada das conchas inferiores após a TIP foram observados no grupo B, com sua ultraestrutura ciliar normal. CONCLUSÕES: A cirurgia revelou ser eficaz a curto, mas não em médio prazo, apesar da recuperação histológica ter sido importante. Abstract in english We report clinical and histological results obtained after partial inferior turbinectomy (PIT), surgery indicated for the treatment of chronic nasal obstruction. METHODS: Twenty patients were divided into two groups submitted to PIT plus septoplasty and PIT alone. The patients were reassessed clinically and histologically by means of a biopsy of the regenerated areas in the inferior turbinates at two different times after PIT, i.e., after 8 to 12 months (group A) and afte (more) r two years (group B). RESULTS: The clinical results proved to be satisfactory for the relief of nasal obstruction in group A and unsatisfactory in group B. However, better histological results with better recovery and epithelial differentiation of the regenerated mucosa of the inferior turbinates after PIT were observed in group B. CONCLUSION: Surgery proved to be effective on a short-term but not on a long-term basis, and histological recovery did not accompany improvement of clinical signs and symptoms.

Bandos, Rogério Dutra; Mello, Valder Rodrigues de; Ferreira, Maria Dolores Seabra; Rossato, Maria; Anselmo-Lima, Wilma Terezinha

2006-10-01

343

The interplay of Graves' disease and twin molar pregnancy.  

UK PubMed Central (United Kingdom)

Twin molar pregnancy with coexistent viable fetus in a patient with Graves' disease is a rare entity. The patient is a 37-year-old woman who was hospitalised owing to persistent vomiting and vaginal bleeding. The pregnancy test was positive and the pelvic ultrasound disclosed twin gestation of complete mole and a coexistent viable 12-week fetus. ?-Human chorionic gonadotropin (?-HCG) and free thyroid hormones were both elevated. The patient was also a diagnosed case of Graves' disease prior to this pregnancy. Given the risks for perinatal complications, the patient was offered early termination of pregnancy. She, however, decided to continue her pregnancy and control the hyperthyroidism with an antithyroid drug (ATD). A week after her discharge from the hospital, she had spontaneous abortion and the histopathology of the abortus revealed complete hydatidiform mole and a 13-week fetus.

Barrera JR; Sandoval MA; Quiwa LQ; Paz-Pacheco E

2013-01-01

344

Prediction of postoperative pain after mandibular third molar surgery  

DEFF Research Database (Denmark)

To evaluate the predictive potential of preoperative psychological and psychophysiological variables in estimating severity of postoperative pain following mandibular third molar surgery (MTMS). Methods: Following ethical committee approval and informed consent, 40 consecutive patients scheduled for MTMS were included. Preoperative psychometric indicators of anxiety, depression, and vulnerability were evaluated by patient questionnaires. Thermal thresholds and heat pain perception (1 second phasic stimuli: 44 degrees C to 48 degrees C) were evaluated with quantitative sensory testing techniques. Standardized surgery was performed during local anesthesia. Postoperative pain management was with rescue paracetamol and ibuprofen. The patients were instructed to record each day their pain at rest and during dynamic conditions, and their requirement of analgesics for 14 days following surgery.

Rudin, Asa; Eriksson, Lars

2010-01-01

345

Rotation of rectangular wire in rectangular molar tubes. Part I.  

UK PubMed Central (United Kingdom)

The degree of angular rotation of rectangular orthodontic wires in rectangular molar tubes was measured using a rotatable mechanical stage on a Unitron metallograph and compared to theoretical data. It was found that square 0.016 inch wire did not bind in 0.018 by 0.022 inch or larger mandrel- or inconel-formed tubes, whereas rotations of 11 to 23 degrees were noted in cast tubes of this dimension. Although 0.016 by 0.022 inch wire did bind in these tubes, the degree of rotation was far greater than expected on the basis of theoretical calculations or clinical expectations. The results indicated that it was unrealistic to expect fine control of a few degrees of torque to occur as expected for delicate clinical control.

Raphael E; Sandrik JL; Klapper L

1981-08-01

346

Molar Gibbs energy formation of RbUO3(s)  

International Nuclear Information System (INIS)

The molar Gibbs energy of formation of RbUO3(s) was determined by measuring the oxygen pressure over the phase field, RbUO3(s)+Rb2U2O7(s)+Rb2UO4(s), using a solid oxide electrolyte galvanic cell in the temperature range 920 to 1100 K and the p