Dissertationen zum Thema „Molars Anatomy“
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Spears, Iain. „Functional adaptations of hominoid molars : an engineering approach“. Thesis, University of Liverpool, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241490.
Der volle Inhalt der QuelleFumes, Ana Caroline. „Avaliação da anatomia de molares decíduos por meio de microtomografia computadorizada“. Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/58/58135/tde-22072013-100259/.
Der volle Inhalt der QuelleThe previous knowledge of the internal and external anatomy of primary teeth is of fundamental importance for the success of the endodontic treatment. The purpose of this study was to analyze the morphology of the roots and root canals of the upper and lower primary molars, using the microcomputed tomography (micro-CT). Forty primary molars, divided in four groups, ten first lower molars, ten second lower molars, ten first upper molars and ten second upper molars. The teeth were scanned and assessed quantitatively by the observation of two-dimensional parameters in the apical third (number, area, roundness, major and minor diameter) at 1, 2 and 3 millimeters of the resorption bevel and three-dimensional parameters (volume, surface area and SMI), as well as the measurement of internal and external dentin thickness and qualitatively by means of observation of the three-dimensional models. The results showed that the maximum number of root canals found for each root was 2. The canals have SMI values between 1.98 ± 0.45 and 2.74 ± 0.38, suggesting a three-dimensional geometrical shape with a tendency to conical. For the dentin thickness of the internal wall of the roots, in general the values were lower than the ones for the external wall. The values of the internal thickness ranged between 0.25 and 0.90 mm in the mesial root and 0.20 and 0.92 mm in the distal root for the lower molars and 0.14 and 1.00 mm on the mesio-vestibular root, 0.24 and 1.14 mm on the disto-vestibular and 0.26 and 1.54 mm on the palatal for the upper molars. Regarding the external thickness, it ranged between 0.35 and 1.45 mm on the mesial root and 0.32 and 1.52 mm on the distal for the lower molars, and 0.22 and 1.33 mm on the mesio-vestibular, 0.28 and 1.40 mm on the disto-vestibular and 0.44 and 2.24 mm on the palatal root of the upper molars. It was observed that the dentin thickness of the external wall was always higher than the extension of the canal. That way, it can be concluded that the observed anatomical variations and the obtained parameters from the micro-CT, a non-destructive method, reproducible and reliable for the study of internal and external anatomy, are important to define clinical protocols for the primary teeth.
Perez, Carolina Altagracia Filpo. „Análise quantitativa da anatomia dos canais radiculares distais dos molares inferiores mediante a microtomografia computadorizada“. Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25147/tde-08112013-110759/.
Der volle Inhalt der QuelleThe objective of this study to evaluate by means of images obtained from computed microtomography (micro-ct), the morphology of the distal root canals of mandibular molars. One hundred images of distal roots of first and second lower molars were obtained with the microtomography (Skyscan 1176 and 1174, Belgium) using a resolution of 18.1 μm. After the reconstruction of the images were analyzed with CTan and CTvol to viewing and standardization according to the classification of Vertucci. The following parameters were evaluated: morphological classification, prevalence the principal canals and ramifications, classification and prevalence isthmus, shape of the canals, through apical diameter mesio-distal and bucco-lingual interval and apical volume. For evaluation of the number, shape of the canals and the presence of isthmus were searched 9 sections of each image from apical 1.0 to 5.0 mm, 0.5 mm before the canals length. To measure mesio-distal and bucco-lingual diameter each image ranged up through DataViewer and then made notations of measurements of the canals in the apical 5.0 mm. The apical volume was calculated in according to the 3D Analysis. The results were subjected to descriptive analysis with the calculation of the percentage of occurrence. The results showed that the morphology the most prevalent was canal type I the Vertucci (76%), followed by type V the Vertucci (11%). The most common canal shape was circular 1.0 to 3.5 mm, followed by the oval in 4.0 mm to 5.0 mm. The presence of a single canal was the most prevalent in levels of 1.0 to 5.0 mm. The isthmus was the most frequently observed type I of the Hsu & Kim (86%) in the level of 1.0 mm, followed by type V (39%) to 5.0 mm. In the measurements of distances, the bucco-lingual was greater than the mesio- distal and volume increased from apical to cervical. The most common Vertuccis classification of the distal canal was the type I, followed by type V; the presence of a single canal was the most prevalent in the levels of 1.0 to 5.0 mm; in the shape of canal, the circular shape was the most common from 1.0 to 3.5 mm (65%), followed by oval shape at 4.0 to 5.0 mm (40%), the flattened shape was less frequent in all levels. The presence of isthmuses most observed was the type I, at levels of 1.0 to 5.0 mm. The measures of bucco-lingual interval were greater at all levels of the root compared to mesio-distal measures, and the volume increased from apical to cervical.
Harb, Leandro José Corrêa. „AVALIAÇÃO IN VITRO DO CANAL CAVO-INTERRADICULAR EM MOLARES INFERIOR“. Universidade Federal de Santa Maria, 2009. http://repositorio.ufsm.br/handle/1/6054.
Der volle Inhalt der QuelleTodo tratamento endodôntico pode levar a insucessos devido às alterações anatômicas internas. Dentre estas está o canal cavo-interradicular, que comunica o assoalho da câmara pulpar com o periodonto na região da furca. Assim foi propósito deste trabalho avaliar a presença deste canal em 360 molares inferiores permanentes humanos que se encontravam armazenados desidratados, utilizando quatro métodos de avaliação: radiografias, a olho nu (ON), pelo microscópio odontológico (MO) e diafanização. Foram comparados os métodos (radiográfico e diafanização) utilizados para verificar a presença do canal cavo-interradicular; e observada a presença de foraminas através dos métodos (ON e MO) pelo assoalho da câmara pulpar e furca; bem como comparados os resultados entre os grupos de rizogênese completa (RC) e incompleta (RI). Foram utilizados 360 molares inferiores pertencentes ao acervo da Disciplina de Anatomia e Escultura Dental da UFSM, todos com assoalho da câmara pulpar intacto e armazenado em recipientes secos. Os mesmos foram rehidratados, seccionados, até 1,5 mm apicalmente à furca e até 0,5 mm do assoalho pulpar. Após, foram imersos em hipoclorito de sódio 1% (24h), lavados em água corrente e nova imersão em hipoclorito de sódio 1% em ultrassom (10 min.), seguida de nova lavagem em água corrente e secos à temperatura ambiente. Depois, foram armazenados individualmente em recipientes de vidro, numerados e tampados. Todas as avaliações foram feitas pelo mesmo operador, sendo a radiográfica com quatro amostras por película com uma lupa (4x); a ON e MO (30x) com iluminação artificial direcional na amostra; e pela diafanização cada amostra em seu recipiente com líquido, sobre um negatoscópio e com auxílio do MO (30x). Pela análise radiográfica o canal cavo-interradicular não se mostrou evidente, mas como uma zona levemente radiolúcida na região da furca em 9,04% das amostras; com suspeita da sua presença em 2,33% e não foi encontrado em 88,63%; pela diafanização, o canal não foi encontrado em 100%; a ON foram evidentes foraminas em 20,9% na furca e 1,9% no assoalho pulpar; pelo MO, 62,1% na furca e 5% no assoalho pulpar. O grupo RC apresentou foraminas em 61,1% na furca e 5,8% no assoalho pulpar; o grupo RI com 64,7% na furca e 3% no assoalho pulpar. Diante das condições desenvolvidas neste trabalho pode-se concluir que o exame radiográfico realmente não serve como um meio de diagnóstico efetivo, mas sim como um exame auxiliar, importante para programar procedimentos clínicos; pelas avaliações a ON e MO, o número de foraminas é bem maior na furca que no assoalho pulpar, podendo ser sítios de deposição de placa bacteriana, dificultando a limpeza da região quando exposta na cavidade bucal, e não houve maior número de foraminas no grupo rizogênese incompleta; o uso do microscópio odontológico é uma ferramenta excelente para visualização dos detalhes anatômicos dentários; a diafanização é um excelente método avaliativo, visto que temos a total visualização em terceira dimensão da anatomia interna dental; e que há necessidade de se estudar mais a respeito da utilização de dentes armazenados desidratados em algumas metodologias de pesquisas.
Lima, Fernando Jose Camello de. „Estudo in vitro da anatomia dos canais radiculares de molares permanentes de humanos“. [s.n.], 2005. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289994.
Der volle Inhalt der QuelleDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O presente estudo teve como objetivo investigar a moriologia dos canais radiculares dos molares permanentes de humanos, identificando a configuração dos canais radiculares (classificação de WEINE modificada), os istmos, canais em C, e a correlação entre anatomia externa e interna. Foram utilizados 131 dentes: primeiros e segundos molares superiores (1°Se 2°SMS) e primeiros e segundos molares inferiores (1°Se 2°8 MI), obtidos em Maceió, AL. Os dentes tiveram as suas características externas registradas, para aí serem seccionados na junção amelo-cementária (JAC), para a visualização dos soalhos e das entradas dos canais radiculares. As raízes foram seccionadas transversalmente a 1; 2,5; 4; 5,5 e 7 mm do ápice e examinadas pelo lado apical no estereomicroscópio. Os dados obtidos foram submetidos ao teste do qui-quadrado com significância de 5%. Encontraram-se todos os tipos estudados de canais radiculares nas raízes mésiovestibulares (MV) dos MS. As raízes palatinas (P) dos 1°SMS e distais (O) de 2°S MI só tiveram um canal, enquanto que esta configuração não foi encontrada nas raízes mesiais (M) de 1°SMI. Os istmos estiveram presentes nas raízes MV dos MS em 98,5%, disto-vestibulares (OV) de MS em 10,4% e nos MI, em 91,1% das raizes mesiais (M) e 46,4% das raizes (O). Seis dentes tiveram canais em C, desses, só um não apresentava fusionamento radicular. O soalho da câmara pulpar nos 1°SMS foi trapezoidal em 75% dos casos e triangular no 2° MS em 53,6% dos casos. Os MS com projeções de cúspides MV apresentaram 81,3% de casos nos 1°SMS e 60,7% nos 2°SMS com mais de um canal na raiz MV. Pode-se concluir que as raizes MV de MS e M de MI têm maior probabilidade de possuírem dois canais. Quanto aos istmos, exceto as raízes P e eventuais raízes V dos MS, todas as outras raízes apresentaram istmos nos canais radiculares, porém a maior incidência apareceu nas raizes MV dos 1°SMS, e nas raízes M dos MI. Quanto ao canal em C, todos os molares, exceto os 1°SMI, mostraram esta configuração anatômica ao nível de raiz, sendo isto mais encontrado nas raízes fusionadas. Os MS, principalmente os primeiros molares, com projeções de cúspides MV apresentam maior possibilidade de ter mais de um canal na raiz MV
Abstract: The aim of this study was to investigate the root canais morphology of permanent human molars, to identify the root canal configuration (Weine modified), to verify the presence of isthmus and C-shapes configuration in root canais, and to establish a correlation between internal/external anatomies. One hundred and thirty-one first and second upperllower molars obtained from Maceio, AL, Brazil, were used. Teeth were sectioned in the enamel- cement junction to investigate pulp canal chamber floar and orifice shapes. Then, the roots were transversally sectioned at 1; 2,5; 4; 5,5 and 7 mm from the apex. Afterwards, they were investigated in stereomicroscopy from an apex side view. Data obtained were submitted to chi-square test. The major diversity of root canal types was found in mesial-buccalroots of the uppermolars. Palatal roots of 1st upper molar and distal roots of 2nd lower molars presented only one root canal, while it did not happen in mesial roots of 1st lower molars. Isthmus were presentin mesial-buccalrootsof the upper molars (98,5%), distal-buccal roots of the upper molars (10,4%), mesial root of the lower molars (91,1%) and distal root of the lower molars (46,4%) of the cases. C-shape root canais were found in 6 teeth, in which, only one did not show root-fusion. Most chamber floar shapes were trapezoidal in 1st (75%) and triangle in the 2nd upper molars (53,6%). First upper molars presented in 81,3% a projection of the mesial-buccal cusps, and 60,7% of the 2nd upper molars showed greater possibility of presenting more than one canal in the mesial-buccal root. In conclusion, mesial-buccal roots in upper molars and mesial roots in lower molars presented more often two root canais. Isthmus was found in ali root canais, except from palatine and eventually buccal roots of upper molars. C-shape root canal morphology were found in ali molars besides first lower ones; being frequently found in teeth with fusioned roots. First upper molars with an overprojected mesial buccal cusp showed more frequently two root canais
Mestrado
Endodontia
Mestre em Clínica Odontológica
Ribeiro, Rafael Rezende. „Avaliação das alterações morfológicas em canais radiculares curvos, promovidas pela instrumentação reciprocante, associada à instrumentação rotatória. Análise por microtomografia“. Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-20032014-110028/.
Der volle Inhalt der QuelleThe purpose of this study was to evaluate the two- and three-dimensional morphological changes, and the transportation that occurs in the mesial canals of mandibular molars with severe curvature. Molars were selected with two independent canals and foramina, no pulpal nodules, internal resorptions, previous endodontic treatment or root fracture and within the standard radius and angle of curvature evaluated by radiographs, cone-beam tomography and microtomography. From the 393 teeth initially selected, 15 fulfilled the selected parameters. The teeth were subjected to microtomography before instrumentation, after instrumentation with Reciproc® R25 and after preparation with each file of the complementary systems (MTwo and K3). The morphometric data were analyzed by CTAn software and the statistical analysis was performed using the SPSS software where the following results were observed. The two-dimensional morphometric analysis showed that the area and the perimeter presented a gradual increase for every evaluated millimeter, starting from the first apical millimeter. There was also a gradual increase in area and perimeter with each change of instrument according to the biomechanical within the sets of groups. There was a statistically significant difference in area and perimeter of root canals after the preparation with the instruments #40 taper 04 and taper 02 (P <0.05). Regarding the distance from the apex area, there was statistically difference among all evaluated millimeters (P <0.05). Regarding the perimeter, there was no difference between 1 and 2 mm, and 4 or 5 (P> 0.05), however with a difference between the third millimeter and the others (P <0.05). The three-dimensional morphological analyses of volume, surface area and root canal SMI (Structural Model Index) of the root canal showed a similar behavior among the groups. The specimens subjected to complementation to the instrumentation with instruments of tapers 04 and 02 showed no statistically significant difference after preparation (P> 0.05), with significant difference between the original and prepared canals (P <0.05). When comparing the sets of groups, no analogue group presented a statistically significant difference (P> 0.05). Transport was analyzed by thirds (cervical, middle and apical) and throughout the canal there, without statistically difference (P> 0.05) among the thirds or between groups with complementation with taper 04 (MTwo) and taper 02 (K3) instruments.
Almeida, Marcela Milanezi de. „Estudo da anatomia radicular de segundos molares superiores por meio da Microtomografia Computadorizada“. Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25147/tde-14102013-163556/.
Der volle Inhalt der QuelleThe aim of this study was to evaluate qualitatively and quantitatively the anatomy of the root canal system of maxillary second molars using computerized microtomography.One hundred samples were scanned at microCT (SkyScan 1174) using a resolution of 19.7 μm and reconstructed in two-dimensional slices to determine the number of main canals and branches, root canal diameter (B-P) and lower diameter (M-D) direction at 1, 2, 3, 4 and 5mm from the apical foramen. Also, the area (mm2) of the mesiobuccal, distobuccal and palatal roots was analyzed. The classification of the root canal system was performed according to Vertucci and additional authors classifications. The results showed that at the apical third, the mesiobuccal root showed a higher frequency of root canals and ramifications. In overall, the bucco-palatal diameter (B-P) and mesio-distal diameter (M-D) gradually increased from the apical to the cervical third. Threedimensional analysis revealed that 98% of disto-buccal and palatal canals fits in the Vertuccis classification. In the mesiobuccal canal 64% of the anatomies could be described by the Vertucci classification. Other authors classifications were found in 18% of mesiobuccal roots, 2% on distobuccal roots and 1% on palatal roots. This study found new types of root canal anatomies that were not previously described, mainly, in the mesiobuccal and palatal roots (19%). It can be concluded that the mesial buccal roots in maxillary second molars show a higher complexity in comparison to the distobuccal and palatal root.
Beleza, Anabela de Jesus Borges. „Anatomia interna dos canais radiculares dos pré-molares inferiores“. Master's thesis, [s.n.], 2014. http://hdl.handle.net/10284/4587.
Der volle Inhalt der QuelleO tratamento endodôntico tem como objectivo restaurar a função e a forma próprias de um dente, mantendo uma condição perirradicular saudável. O objectivo deste trabalho baseia-se numa breve revisão da literatura com a intenção de reforçar a estreita relação entre o conhecimento da anatomia interna do sistema de canais radiculares e o sucesso no tratamento endodôntico. São relatadas nesta monografia as características da anatomia interna no grupo dos pré-molares inferiores. Os dentes pré-molares são um grupo dentário que pode apresentar variações na anatomia interna dos canais radiculares. Uma raiz com apenas um canal único e forâmen único são uma excepção e não a regra. A pesquisa bibliográfica foi realizada nas bibliotecas da Universidade Fernando Pessoa e Faculdade de Medicina Dentária da Universidade do Porto e nos motores de busca da internet Pubmed, Science Direct e Scielo, entre Abril e Junho de 2014. Novos recursos estão ao dispor dos Médicos Dentistas para facilitar o trabalho e aumentar o conhecimento dos canais, tais como, a tomografia computorizada de feixe cónico, a tomografia micro-computorizada ou o microscópio operativo. As alterações anatómicas quando desconsideradas podem dificultar o tratamento endodôntico. É essencial que os Médicos Dentistas tenham uma ideia clara e conhecimentos acerca da anatomia do sistema de canais dos pré-molares. A resolução de casos com anatomia incomum exige, consequentemente, mudanças não só como no diagnóstico, como também no tratamento. Endodontic treatment aims to restore tooth’s function and form as well as mantaining a healthy periradicular condition. This presente work is based on a brief review of the literature with the intent to reinforce the close link between knowledge of internal anatomy of the radicular canal systems and the achievement of succes in endodontic treatment. In this monography are reported characteristic of the internal anatomy in the dental group of mandibular premolars. The dental group of the premolars can present themselves with a variable internal root canal anatomy. One root with one single canal and one single foramen is the exeption and not a rule. The bibliographic research was realized in the libraries of Fernando Pessoa University, in the Dental Medicine College from the Oporto University and in the internet search engines Pubmed, Science Direct and Scielo, between April and June 2014. New features are available for dentists for a better work and increase of knowledge, such as, computed come beam tomography, microcomputed tomography or surgical operative microscope. The anatomical changes when ignored can complicate the endodontic therapy. It is essential for the clinicians to have a clear picture and understanding of the canal anatomy of premolars and its variations. The resolution of unusual cases demands, therefore, not only changes in the diagnosis, but in the treatment, as well.
Rosalem, Cíntia Gonçalves Carvalho. „Influência do tratamento endodôntico sobre a espessura dentinária na região da concavidade mesial do 1o . pré-molar superior“. Universidade Federal do Maranhão, 2015. http://tedebc.ufma.br:8080/jspui/handle/tede/1370.
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Fundação de Amparo à Pesquisa e ao Desenvolvimento Científico e Tecnológico do Maranhão (FAPEMA)
Introduction: The root concavities may influence the dental treatment. Variations in root morphology are suggested as the main cause of perforations and other types of failures. The decrease in dentin thickness in the wall of the root canal in teeth subjected to endodontic treatment can be aggravated by procedures such as scaling and root planing and preparation for intracanal posts, especially in areas where the concavity is present. Objective: To evaluate the influence of root concavity mesial on the thickness and volume of dentin of maxillary first premolars before and after endodontic instrumentation and scaling and root planing. Methods: Twenty-seven firts premolars were analyzed for the presence of the proximal concavity. The teeth were then evaluated using the method of computed microtomography (micro-CT), where the thickness and the volume of dentin was examined. The teeth were scanned again after endodontic instrumentation and scaling and root planing. The data were submitted to descriptive statistical analysis. To evaluate the dentin thickness was used t test for paired samples and to evaluate the dentin volume, the Wilcoxon test (p <0.05). Results: The root concavities were present in all mesial surfaces of teeth examined. The dentin thickness in the region of the concavities decreased in millimeters, of 1.81 ± 0.25 to 1.55 ± 0.26 (p <0.001) and decreased dentin volume in cubic millimeters of 148.37 ± 43 53 to 140.36 ± 37.09 (p <0.001) after endodontic instruments and scaling and root planing. Conclusion: It can be concluded that the root concavities were present in 100% of the analyzed teeth. The dentin thickness in the region of the concavities decreased considerably after endodontic instruments and scaling and root planing, and the volume of dentin at the cervical third of the root also reduced after the treatments.
Introdução: As concavidades radiculares podem ter influência no tratamento odontológico. Variações na morfologia radicular são sugeridas como a principal causa de perfurações e outros tipos de falhas. A diminuição da espessura dentinária na parede do canal radicular, em dentes submetidos a tratamentos endodônticos, pode ser agravada por procedimentos como raspagem e alisamento radicular e preparos para pinos intrarradiculares, especialmente em áreas onde a concavidade está presente. Objetivo: avaliar a influência da concavidade radicular da face mesial dos primeiros pré-molares superiores na espessura e no volume de dentina antes e após instrumentação endodôntica e raspagem e alisamento radicular. Métodos: Vinte e sete primeiros pré-molares superiores foram analisados quanto à presença de concavidade proximal. Os dentes foram então avaliados, através do método da microtomografia computadorizada (Micro-CT), onde foi analisada a espessura e o volume de dentina. Os dentes foram novamente digitalizados após instrumentação endodôntica e raspagem e alisamento radicular. Os dados foram submetidos à análise estatística descritiva. Para avaliação da espessura dentinária foi utilizado o teste t para amostra pareadas e para avaliação do volume dentinário, o teste de Wilcoxon (p<0,05). Resultados: As concavidades radiculares estavam presentes em todas as faces mesiais dos dentes avaliados. A espessura de dentina na região da concavidade diminuiu, em milímetros, de 1,81±0,25 para 1,55±0,26 (p<0,001) e o volume dentinário diminuiu, em milímetros cúbicos, de 148,37±43,53 para 140,36±37,09 (p<0,001) após a instrumentação endodôntica e raspagem e alisamento radicular. Conclusão: Pode-se concluir que as concavidades radiculares estiveram presentes em 100% dos dentes analisados. A espessura de dentina na região da concavidade diminuiu consideravelmente após a instrumentação endodôntica e raspagem e alisamento radicular, assim como o volume de dentina no terço cervical da raiz também diminuiu após os tratamentos realizados.
Dantas, Jacqueline Garcia Fernandes. „Comprova??o da real comunica??o entre o endodonto e o periodonto atrav?s do canal cavo inter-radicular e sua preval?ncia em molares inferiores humanos“. Universidade Federal do Rio Grande do Norte, 2006. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17081.
Der volle Inhalt der QuelleThe neurovascular system of the pulp and of the periodontium is interconnected and among the possible intercommunications between these two tissues, there is the cavo inter-radicular canal. It is a small canal that goes through any inter-radicular dentine and arises in the furca region of the multi-radicular teeth. Its predominance has been studied in the literature, by several methodologies, with divergent results. The objective of this work was to establish, in vitro, the predominance of the cavo inter-radicular canal, in human lower molars, through the diaphanization technique and dye leakage. For this research, 140 teeth (100 first and second 40 lower molars) were selected, extracted due to different reasons, belonging to a teeth bank of the Endodontics discipline of the Dentistry College at Federal University of Rio Grande do Norte. The teeth were preserved in formol until the moment of use and immersed in physiological solution. Had the endodontic access fulfilled and the whole external surface, except for the furcation, sealed with two layers of nail enamel. The cleaning of the pulpar chamber floor was carried out with sodium hypochlorite solution 5%, being this solution renewed every 5 minutes, during 1 hour. The teeth were immersed in Indian dye and, after drying of the dye, they had their crowns split up in the amelo-cemental junction. Then, they were examined in a stereomicroscope, where marks of the coloring were observed in the furcation and on the pulpar floor. After this recording, the sample was diaphanized and with the transparent teeth, it was possible to observe in the stereomicroscope, the true inter-radicular canals. As a result of this experiment, the presence of these canals was observed in 13 % of the first and 7, 5 % of the second evaluated molars. The study showed that both the presence of the cavo inter-radicular canal is real and the diaphanization and dye leakage is an efficient method for this type of research
O sistema neurovascular da polpa e do periodonto ? interligado e, dentre as poss?veis intercomunica??es entre esses dois tecidos, tem-se o canal cavo inter-radicular. Trata-se de um pequeno canal que percorre toda dentina inter-radicular e se exterioriza na regi?o de furca dos dentes multirradiculares. Sua preval?ncia foi estudada na literatura, por diversas metodologias, com resultados divergentes. O objetivo desse trabalho foi estabelecer, in vitro, a preval?ncia do canal cavo inter-radicular, em molares inferiores humanos, atrav?s da t?cnica de infiltra??o de corante e diafaniza??o. Para a pesquisa foram selecionados 140 dentes (100 primeiros e 40 segundos molares inferiores), extra?dos por raz?es diversas, pertencentes ao estoque de dentes da disciplina de Endodontia da Faculdade de Odontologia da Universidade Federal do Rio Grande do Norte. Os dentes anteriormente mantidos em formol foram lavados em ?gua corrente e conservadps em soro fisiol?gico at? o momento de uso. Nesse momento os mesmos tiveram os acessos endod?nticos realizados e toda a superf?cie externa, exceto a furca, impermeabilizada com duas camadas de esmalte de unha. A limpeza do assoalho da c?mara pulpar foi feita com solu??o de hipoclorito de s?dio a 5%, sendo essa solu??o renovada a cada 5 minutos durante 1 hora. Os dentes foram imersos em tinta nanquim e, ap?s secagem do corante, tiveram suas coroas seccionadas na jun??o amelocement?ria. Foram ent?o examinados em um estereomicrosc?pio, onde se observou marcas do corante na furca e ou assoalho pulpar. Feito esse registro, a amostra foi diafanizada e, com os dentes transparentes, p?de-se observar no estereomicrosc?pio, os verdadeiros canais cavo inter-radiculares. Como resultado desse experimento, foi verificada a presen?a desses canais em 13% dos primeiros e 7,5% dos segundos molares avaliados. O estudo demonstrou que a presen?a do canal cavo inter-radicular ? real e a diafaniza??o associada ? infiltra??o de corante um m?todo eficaz para esse tipo de pesquisa
Sauaia, Tetis Serejo. „Estudo morfometrico da raiz mesial do primeiro molar inferior permanente com diferentes comprimentos : estudo in vitro“. [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/289820.
Der volle Inhalt der QuelleTese (doutorado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba
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Resumo: O objetivo deste estudo foi realizar, in vitro, um estudo morfométrico das raízes mesiais de primeiros molares inferiores extraídos, com diferentes comprimentos. Após secção transversal a 2 mm da bifurcação radicular, as medidas foram realizadas na superfície frontal do segmento coronário e compreenderam a menor espessura de dentina entre os canais e a face distal, na zona de risco, a distância entre os canais, a profundidade da concavidade (sulco da face distal), e as distâncias entre as faces vestibular e lingual e mesial e distal. Com base nos comprimentos médios e desvios padrão, os dentes foram divididos em três grupos de estudo: Grupo I: dentes longos (n = 25), Grupo II: dentes médios (n = 28) e Grupo III: dentes curtos (n = 39). Os dentes foram incluídos em resina, vazados em mufla, seccionados transversalmente a 2 mm abaixo da furca. As imagens foram obtidas através de lupa estereoscópica com lente de 10X, transferidas ao computador e analisadas pelo programa Imagelab, utilizando uma escala construída para o experimento. Os dados foram submetidos à análise de variância usual, com a utilização do teste F, seguido, quando necessário, do teste de Tukey. Os resultados mostraram que, o grupo dos dentes longos, apresentou significância nas distâncias entre o canal mésio-vestibular e a face distal, na medida da profundidade da concavidade (face distal) e na distância entre as faces vestibular e lingual (p Y 5%). Os dentes curtos, apresentaram diferença estatística significante na distância entre os canais mesiais (p Y 5%). Foi concluído que, a espessura da parede dentinária na zona de risco é menor nos dentes longos em relação aos dentes curtos; a profundidade da concavidade (face distal) é maior nos dentes longos do que nos dentes curtos; a distância entre os canais mesiais é menor nos dentes curtos em relação aos dentes médios e longos; e, a distância entre as faces vestibular e lingual é maior nos dentes longos, em relação aos outros dois grupos
Abstract: The purpose of this in vitro study was to perform morphometry on the mesial root of extracted mandibular first molars, with different lengths. Measurements were taken on the 2 mm cross-section surface below the bifurcation. The measurements recorded were the minimum dentin thickness between mesial canals and the distal surface, the distance between the root canals, the depth of the concavity (distal ridge surface) and the buccal-lingual and mesio-distal distances. Based on the median of the length and standard deviation, the teeth were divided into three groups: Group I: long teeth (n = 25), Group II: medium teeth (n = 28) and Group III: short teeth (n = 39). The teeth were embedded in resin blocks; placed in a muffle, and then 2 mm cross-sections were made below the bifurcation. Images were obtained by a 10X stereoscopic loupe, transferred to a computer and then analyzed by the Imagelab software using a scale made for this experiment. The data was analysed for normal variance using the F test, followed, when necessary, by the Tukey test. The results had shown that the group of long teeth showed significance in distances between the mesio-buccal canal and the distal surface, in the depth measurement of the distal surface and the in measurement between the vestibular and lingual surfaces (p Y 5%). The short teeth showed statistical difference in the distance between the mesial canals (p Y 5%). In conclusion, the dentin wall on the risk zone is thicker in long teeth than in short teeth; the depth of the concavity (distal surface) is bigger in long teeth than in short teeth; the distance between the mesial canals is shorter in the short teeth group than in long and medium teeth; and the distance between the buccal and lingual surfaces is bigger in long teeth, than in the two other groups
Doutorado
Endodontia
Doutor em Clínica Odontológica
Biagi, Amanda Buosi de. „Avaliação, por meio de microtomografia computadorizada, da anatomia interna e externa de primeiros pré-molares superiores“. Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-04022015-090126/.
Der volle Inhalt der QuelleThe aim of this study was to evaluate the anatomy of the root canal system (RCS) of 72 maxillary first premolars (32 single-rooted, 30 two-rooted with radicular grooves and 10 three-rooted), using computed microtomography (μTC). The specimens were scanned with the SkyScan 1174v2 microtomography device and the images were reconstructed for analysis of two-dimensional parameters (number, area, roundness, major diameter, minor diameter, and form factor) at 1, 2 and 3 mm of the apical foramen, and three-dimensional parameters (volume, surface area, structure model index - SMI, number and location of accessory canals), as well as examination of external anatomic characteristics of the roots (presence, location, depth and extension of the grooves, and internal and external dentin thickness) and qualitative analysis of the three-dimensional models. No more than three canals were found in the apical third. At 1 mm from the apical foramen in single-rooted teeth, mean values of the major diameter were twice as higher than those of the minor diameter. The roundness pattern of the canals revealed a round shape with a tendency to flattening in the single-rooted premolars, and a shape with more accentuated roundness in the two- and three-rooted premolars, mainly in the palatal roots. The form factor results confirmed the more circular shape of all teeth. In the three-dimensional analysis, the highest values of mean volume (14.84±10.78mm³) and surface area (83.65±48.26mm²) were found in the canals of the single-rooted premolars, and the lowest values of mean volume (3,78±1,61mm³) and surface área (25,11±6,17mm²) were observed in the distobuccal root of the three-rooted premolars. The mean SMI values were similar in all roots of the three groups of premolars, indicating a tendency to a 3D cylinder-like geometry of the canals. The presence of one accessory canal ranged from 45 to 100% in the apical third and 15 to 100% in the middle third in all evaluated roots. In the examination of the external root surface, 35 radicular grooves (23 singles and 12 doubles) were found, with prevalence (100%) in the palatal face of the buccal root in two-rooted premolars. The radicular groove depth presented higher mean value (0.57±0.27mm) in the cross-section corresponding to 1 mm above the middle point of the full length of the groove. The correlation test showed that in the cross-sections more coronal to the groove, the greater the depth, the more accentuated the flattening and the greater the occurrence of division of the canals within the root. The analysis of the tree-dimensional models demonstrated the prevalence of Vertucci\'s type IV configuration. In conclusion, the use of μCT provided a detailed evaluation of the internal and external anatomy of the RCS in singlerooted, two-rooted and three-rooted maxillary first premolars.
Wilson, G. B. „Small scale evolutionary changes in the molar crown of rodents from the Isle of Wight, England and Masada del Valle, Spain : a multivariate morphometric study“. Thesis, University of Bristol, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355145.
Der volle Inhalt der QuelleGranda, Morón Germán Augusto. „Estudio de la anatomía de las raíces y conductos radiculares en segundas molares permanentes mandibulares mediante tomografía computarizada de haz cónico“. Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2016. http://hdl.handle.net/10757/621709.
Der volle Inhalt der QuelleObjective: Determine the anatomy of roots and root canals in mandibular second permanent molars by cone beam computed tomography Materials and Methods: 400 mandibular second permanent molars views in CT of patients treated at the Instituto de Diagnóstico Maxilofacial (IDM) in a period January - June 2015. The anatomy of the pieces was analyzed in the axial and sagittal planes, which determined the number of roots and root canals, canals type according to the classification of Vertucci in the mesial and distal root, the presence of C-shaped canals and type of C-shaped canals according to the classification of Melton. Results: SMMP was found with two roots 287 (71.75%). On the other hand, three Canals was observed in 282 (70.50%) teeth. It was also noted that for the type of canals in the mesial root of Type II showed 66 (16.50%) and Type III showed 66 (16.50%). Also, in distal root was found Type I 357 (89.25%). In addition to the presence of C-shaped root canals system was observed in 113 (28.25%) pieces and in 287 (71.75%) was absent. Finally, for the type of C-shaped canals the most predominant type was "c3" 61 (15.25%). Conclusion: We conclude that the SMMP have two roots with three root canals and canals settings in the mesial root is Type II and III, while the distal root is the type I. There is also a high prevalence of ducts C-shaped, being the most prevalent type "c3".
FERRARI, V. B. C. „Estudo In Vitro da Anatomia dos Canais da Raiz Mesiovestibular em Primeiros Molares Superiores Utilizando Diferentes Métodos“. Universidade Federal do Espírito Santo, 2009. http://repositorio.ufes.br/handle/10/8142.
Der volle Inhalt der QuelleO presente estudo teve o objetivo de avaliar in vitro as variações na anatomia interna da raiz mesiovestibular (MV) de primeiros molares superiores, por meio de raios X, microscopia operatória, tomografia computadorizada de feixe cônico (TCFC) e diafanização. Utilizaram-se 50 dentes os quais foram acessados dentro dos padrões endodônticos, radiografados, tomografados, fotografados (soalho) e diafanizados. Os resultados demonstraram que a prevalência de canais MV2 (segundo canal na raiz MV) foi de 70% na diafanização e na TCFC; já na microscopia operatória, foi semelhante, 66%, mostrando-se um importante método. Nas análises radiográficas, os índices de kappa foram baixo a moderado, indicando um limitado valor dos raios X na detecção do MV2 comparados à diafanização. As configurações tipo I (um canal e um forame) e II (dois canais e um forame) foram as mais encontradas. Em relação ao número de forames, os resultados da diafanização e TCFC também foram idênticos: 40% dois forames e 60% um forame. Já em relação à posição dos forames, quando único, a TCFC mostrou 53,3% dos forames coincidindo com o ápice e 46,7% para-apical. Na diafanização, esses valores foram de 70% e 30% respectivamente. Quando a raiz apresentava dois forames apicais, o forame MV1 apresentou-se para-apical na TCFC em 20% dos casos e, na diafanização, todos os forames coincidiram com o ápice (100%). O MV2 apresentou-se para-apical na TCFC em 10% e, na diafanização, em 75% dos casos. Um terceiro canal esteve presente tanto na diafanização como na TCFC em 8% das amostras, sendo que, desses 8% vistos, 75% apresentaram-se com dois forames apicais e 25% com um forame apical. As ramificações anatômicas como deltas apicais (28%), canais secundários (38%), acessórios (10%), recorrentes (6%) e intercanais (24%) foram visualizadas com bastante nitidez na diafanização e em apenas alguns dentes na TCFC. Considerando a diafanização como padrão referencial na avaliação da anatomia interna dos canais, a TCFC, quando comparada àquele método laboratorial, pode constituir-se em uma ferramenta clínica importante para a terapia endodôntica tanto no diagnóstico como no tratamento da raiz MV dos MS.
Boschetti, Emanuele. „Avaliação, por meio de microtomografia computadorizada, da anatomia externa e interna de pré-molares inferiores com sulcos radiculares“. Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-07022014-152818/.
Der volle Inhalt der QuelleThe study of the internal anatomy of the complex root canal system (RCS) is of utmost importance for the diagnosis, planning and endodontic treatment plan. The aim of this study was to evaluate the anatomy of the RCS of mandibular premolars with radicular grooves by computed microtomography (μTC). Image acquisition of 69 mandibular first premolars (1PM) and 14 mandibular second premolars (2PM) was performed using the SkyScan 1174 microtomography device. The specimens were scanned and images were reconstructed in order to analyze two-dimensional parameters (number, area, roundness, major diameter, minor diameter, and shape factor) at 1, 2 and 3 mm of the apical foramen; three-dimensional parameters (volume, surface area, SMI, number and location of accessory canals), and the external anatomic characteristics of the roots (presence, location, depth and extension of grooves and internal and external root dentin thickness). A qualitative analysis of the internal anatomy of the three-dimensional models was also performed. In the apical third, it was found up to four root canals; the major diameter presented values, on average, twice greater than those of the minor diameter in both dental groups; the values of roundness and shape factor ranged from 0.43±0.25 to 0.61±0.17, and from 0.59±0.26 to 0.80±0.13, respectively, demonstrating the slightly flattened shape with circular tendency of these canals, in the 1MP and 2MP. The three-dimensional analysis showed that the mean volume (mm³), SMI and surface area (mm²) were, respectively, 10.78±5.42, 2.84±0.61 and 58.51±16.41 for the 1MP and 10.89±5.77, 2.46±0.31 and 60.64±17.46 for the 2MP. The accessory canals were observed mostly in the apical and middle third in 56.62% of 1MP and 64.28% of 2MP. In the analysis of the external root surface, 182 radicular grooves were observed in the 1MP and 44 in the 2MP, with prevalence in the mesial face of the examined roots. The deepest groove was found in the region corresponding to half of its total length and the dentin thickness on the internal and external faces of the roots in the region of the radicular grooves decreased in a corono-apical direction, the smallest internal thickness being 1 mm, which characterizes the presence of a danger zone. The three-dimensional models showed a prevalence of single canals leaving the pulp chamber and dividing into two distinct and separate canals (type 1-2) (59.42%) in the 1MP and single canals starting from the pulp chamber up to the apex (type 1) (35.70%) in 2MP. It may be concluded that μTC allowed the study of the internal and external anatomy of the roots, with identification of two new morphological types of SCR in mandibular premolars.
Justiniano, Navarro Carlos Alberto. „Evaluación del grosor dentinario de primeros molares deciduos a nivel de las paredes de los conductos radiculares en tomografía computarizada de haz cónico“. Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/654956.
Der volle Inhalt der QuelleObjective: To evaluate the dentin thickness in cervical, middle and apical third of deciduous first molars at the level of the root canal walls by using cone beam computed tomography. Materials and Methods: The sample consisted of 30 Cone Beam tomography. The analysis unit was made up of deciduous first molars, which were divided into two groups (n=15), the group of upper and lower deciduous first molars. To take the measurements of the dentin thickness of the walls of each canal, 3 axial views were made on the tomography in the cervical, middle and apical third. Then each third was divided into 4 surfaces (distal, mesial, lingual / palatal and vestibular), which served to take the measurements and make the sum of the 4 surfaces of the dentin thickness in millimeters to obtain the final average of the third. Data were analyzed using descriptive statistics (mean, median, standard deviation and interquartile range). Results: The means for the upper and lower deciduous first molar group were obtained, in which different measures were observed at the level of the three-thirds and evaluated surfaces. Conclusion: It is important know more about anatomy of the first deciduous molar, due to the various characteristics that it presents compared to the molars of the permanent dentition.
Tesis
Ceperuelo, Sánchez Mª Dolors. „Anatomía de los conductos radiculares de los molares a través de los restos fósiles de la cueva del Mirador (Atapuerca)“. Doctoral thesis, Universitat Internacional de Catalunya, 2015. http://hdl.handle.net/10803/368201.
Der volle Inhalt der QuelleLa anatomía y la morfología de los conductos radiculares de los molares, presentan unas características determinadas. Existen numerosas clasificaciones en la especialidad de la endodoncia (odontología), que nos describen el recorrido del tejiido pulpar desde la zona más coronal al ápice de un diente. Una de la más utilizadas actualmente, es la clasificación de Vertucci. Pero, ¿cómo eran los molares de hace más de 4.000 años? ¿Es aplicable esta clasificación en restos fósiles? Con la llegada de las nuevas tecnologías como el Cone Bean Computer Tomography (CBCT) existe la posibilidad de estudiar internamente, los restos fósiles de una muestra como la perteneciente a la Cueva de El Mirador (Atapuerca), con la gran ventaja de no destruirla. Se tratan de restos arqueológicos pertenecientes al Calcolítico y a la Edad de Bronce, cuya cronología va del 4.760-4.200 cal. A.P. El estudio interno de los conductos radiculares, nos mostraran si han habido cambios significativos hasta el llegar al hombre actual, si los resultados los podemos relacionar con corrientes migratorias, y si presentan rasgos característicos de raza.
Souday, Caroline. „Analyse morphométrique des molaires déciduales et définitives dans le genre Homo : perspectives phylogénétiques et biogéographiques“. Paris, Muséum national d'histoire naturelle, 2008. http://www.theses.fr/2008MNHN0006.
Der volle Inhalt der QuelleWorks concerning hominid phylogeny are confronted to a major problem : the representativeness of the fossil record. In that context, dental remains are of a great interest as they are the best preserved anatomical elements. The morphology of permanent and deciduous molar crowns in the Homo genus was thus analysed by geometric morphometrics approach : radial Fourier transform. The originality of the postcanine teeth morphology among Neandertal has been demonstrated by this approach, as well as their morphological proximity with older European fossils. These results allow us to consider a morphological differentiation from the early middle Pleistocene,eventually earlier, in Europe. In addition, a more detailed analysis on Neandertal variability enabled to show a correlation between morphological distances and geographical distances for the first superior molars
Ialea, Darío E. „Conducto medio-mesial“. Trabajo final de especialización, Universidad Nacional de Cuyo. Facultad de Odontología, 2020. http://bdigital.uncu.edu.ar/15324.
Der volle Inhalt der QuelleFil: Ialea, Darío E.. Universidad Nacional de Cuyo. Facultad de Odontología.
Pérez, Avila Luis Ronald. „Posición de terceras molares mandibulares, según la clasificación de Pell y Gregory, y su relación con el biotipo facial, en pacientes de 18 a 40 años, del servicio de ortodoncia, del Hospital Santa Rosa, años 2008- 2016“. Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2018. https://hdl.handle.net/20.500.12672/9729.
Der volle Inhalt der QuelleTesis
Gutiérrez, Navarro Yamili Eliana. „Morfología mandibular según el biotipo facial en pacientes de 18 a 35 años de la Clínica de Imagenología de la Facultad de Odontología de la Universidad Nacional Mayor de San Marcos“. Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2019. https://hdl.handle.net/20.500.12672/11397.
Der volle Inhalt der QuelleTesis
Mezomo, Maur?cio Barbieri. „Avalia??o tomogr?fica das dimens?es alveolares da zona retromolar superior em pacientes com e sem terceiros molares“. Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2017. http://tede2.pucrs.br/tede2/handle/tede/7324.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
Introduction: this thesis aimed to evaluate bone anatomy of the of the maxillary tuberosity in patients with and without upper third molars, besides evaluating the maxillary sinus pneumatization in this region, in cone beam computed tomography (CBCT) and reconstructed panoramic radiography (RPR). Methods: in study 1, 40 CBCT of individuals without upper third molar (Group 0) and 40 CBCT of individuals with upper third molar (Group 1) were evaluated. The height and radicular width of the upper second molar (USM), the height, width and bone length of the maxillary tuberosity were measured, in addition to the pneumatization of the maxillary sinus in this region. In study 2, 21 CBCT were evaluated, the height of the disto-buccal root of the USM and height and length of the tuberosity bone at different locations was measured. In addition, the pneumatization of the maxillary sinus in this region was scored. Measurements were performed on tomographic slices and on the RPR. Results: in study 1, there was no significant difference between the groups for the gender (p = 0.85), for age (p = 0.07) and for dental measurements (p> 0.58). Bone height was lower (p = 0.023) in group 0 only in the measurement performed 7mm distally to the second molar. The tuberosity width was higher in group 1 (p <0.0001) in all measurements, with the exception of measurement 1mm distally to the second molar. Buccal bone length was significantly lower (p <0.005) in group 0. The maxillary sinus pneumatization in the maxillary tuberosity region was significantly higher in group 0. In study 2, the radicular height showed a high correlation between the groups (ICC = 0.929). A moderate to low correlation (ICC <0.603) was observed for bone heights on comparison between tomographic slices and RPR. The correlation for bone length was high in central (ICC> 0.921) and palatal (ICC> 0.732) regions of the tuberosity, but low in the buccal region (ICC <0.441) when the measure of the RPR was compared to the measurements of tomographic slices. The maxillary sinus pneumatization scores for the maxillary tuberosity region were quite similar in both groups (kappa = 0.970). Conclusion: in study 1, the dimensions of the maxillary tuberosity presented individual variation. Group 0 presented smaller dimensions than group 1, mainly regarding tuberosity width and buccal bone length. Group 0 showed higher scores of maxillary sinus pneumatization towards the tuberosity. In study 2, measurements of the height of the distobuccal root of the USM, central and palatal length of the tuberosity and pneumatization of the maxillary sinus to the tuberosity region obtained in the tomographic slices presented a high correlation with the RPR measurements. However, the measurements of vestibular length showed a low correlation between both techniques.
Introdu??o: o objetivo desta tese foi avaliar a anatomia ?ssea da regi?o da alveolar da tuberosidade maxilar de pacientes com e sem terceiros molares superiores, al?m de avaliar a pneumatiza??o do seio maxilar nesta regi?o, em tomografia computadorizada de feixe c?nico (TCFC) e em radiografia panor?mica reconstru?da (RPR) M?todos: no estudo 1, avaliou-se 40 TCFC de indiv?duos sem terceiro molar superior (Grupo 0) e 40 TCFC de indiv?duos com terceiro molar superior (Grupo 1). Mediu-se a altura e largura radicular do segundo molar superior (2MS), a altura, largura e comprimento ?sseo da tuberosidade maxilar, al?m da pneumatiza??o do seio maxilar nesta regi?o. No estudo 2 foram utilizadas 21 TCFC. Mediu-se a altura da raiz disto-vestibular do segundo molar superior (2MS), altura e comprimento ?sseo da tuberosidade maxilar em diferentes localiza??es. Tamb?m foi mensurada a pneumatiza??o do seio maxilar nesta regi?o. As medi??es foram realizadas em cortes tomogr?ficos espec?ficos e na RPR para compara??o entre as t?cnicas. Resultados: no estudo 1, n?o houve diferen?a significativa entre os grupos para o g?nero (p=0,85), para a idade (p=0,07) e para as medidas dent?rias (p>0,58). Em rela??o ?s medidas ?sseas, a altura ?ssea foi menor (p=0,023) no grupo 0 apenas na mensura??o realizada 7mm distalmente ao 2MS, a largura da tuberosidade foi maior no grupo 1 (p<0,0001) em todas as mensura??es, com exce??o da medi??o realizada 1mm distalmente ao segundo molar, o comprimento ?sseo vestibular foi significativamente menor (p<0,005) no grupo 0. A pneumatiza??o do seio maxilar na regi?o da tuberosidade maxilar foi significativamente maior no grupo 0. No estudo 2, encontrou-se alta correla??o entre os grupos (ICC=0,929) para a altura radicular. A correla??o foi moderada a baixa (ICC<0,603) na compara??o entre as medidas nos cortes tomogr?ficos e na RPR para a altura ?ssea. A correla??o para a medida de comprimento ?sseo foi alta na regi?o central (ICC>0,921) e moderada na palatina (ICC>0,732), mas baixa na regi?o vestibular (ICC<0,441) quando comparada a medida da RPR ?s medidas dos cortes tomogr?ficos. Os escores de pneumatiza??o do seio maxilar para a regi?o da tuberosidade maxilar foram bastante similares em ambos os grupos (kappa=0,970). Conclus?o: a partir do estudo 1 concluiu-se que as dimens?es da tuberosidade maxilar apresentaram varia??o individual, o grupo 0 apresentou dimens?es menores que o grupo 1, principalmente quanto ? largura da tuberosidade e comprimento ?sseo vestibular, o grupo 0 apresentou ?ndices maiores de pneumatiza??o do seio maxilar em dire??o ? tuberosidade. No estudo 2 as medidas da altura da raiz disto-vestibular do 2MS, comprimento central e palatino da tuberosidade e pneumatiza??o do seio maxilar para a regi?o da tuberosidade obtidas nos cortes tomogr?ficos apresentam alta correla??o com as medidas da RPR. Por?m a medida de comprimento vestibular, nos cortes tomogr?ficos, apresenta baixa correla??o com a medida de comprimento na RPR.
Cecchin, Doglas. „Influência do alargamento cervical na determinação do instrumento apical inicial utilizado para instrumentação dos canais radiculares de primeiros molares superiores: análise por microscopia eletrônica de varredura“. Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-19022009-164349/.
Der volle Inhalt der QuelleThe aim of this study was to investigate ex vivo the influence of cervical preflaring on determination the initial apical file (IAI), in the working length (WL), of the root canals of the maxillary first molars and to determine the shape of the canal at 1 mm from the apex. Fifty teeth were randomly divided into 5 groups (n=10) in accordance with the preflaring of the cervical and middle thirds of the canal: GI - without preflaring; GII - Gates-Glidden burs (#2, #3) (GG); GIII - AET (S1, SC, S2 and S3); GIV - GT Rotary File (20/06, 20/08, 20/10 and 20/10) (GT); GV - LA Axxess burs (20.06, 35.06) (LA). The canals were sized with the type K-file, passively inserting the file 08 in the WL and files with successively greater diameters until a binding sensation was felt. Cross sections were made in the WL, analyzed by SEM and the IAI area and the area of the root canal were measured to verify the percentage that the IAI occupied inside the canal in each sample. The shape of the root canal was classified as circular, oval and flattened. The analysis of variance indicated a statistically significant difference between the area occupied by the IAI and the experimental groups (p<0.0001). The results showed that for the mesiobuccal canal, the decreasing values by percentage that the IAI occupied inside the canal were: LA Axxess (66.70 ± 7.10) > GT (44.16 ± 9.35) = AET (44.10 ± 8.88) > GG (33.17 ± 6.68) = without preflaring (23.85 ± 6.86); for the distobuccal canal: LA Axxess (75.12 ± 8.56) > GT (58.68 ± 7.70) = AET (54.66 ± 7.12) > GG (39.76 ± 7.52) > without preflaring (26.90 ± 6.10); and for the palatal canal: LA Axxess (66.55 ± 11.40) > AET (51.98 ± 10.67) = GT (49.50 ± 10.05) > GG (35.70 ± 7.62) > without preflaring (21.43 ± 2.79). The shape of the canal was predominantly flattened for the mesiobuccal canal, circular for the distobuccal canal and oval for the palatal canal. It may be concluded that the preflaring of the cervical and middle thirds of the root canal allows better determination of the IAI and that the cervical preflaring with LA Axxess burs presented better adaptation of the IAI in the WL.
Tafforeau, Paul. „Aspects phylogénétiques et fonctionnels de la microstructure de l'émail dentaire et de la structure tridimensionnelle des molaires chez les primates fossiles et actuels : Apports de la microtomographie à rayonnement X synchrotron“. Montpellier 2, 2004. http://www.theses.fr/2004MON20116.
Der volle Inhalt der QuelleFerreira, Tiago André Leal. „Estudo transversal da anatomia endodôntica de pré-molares e molares inferiores por meio de CBCT“. Master's thesis, 2021. http://hdl.handle.net/10400.14/34803.
Der volle Inhalt der QuelleIntroduction: Knowledge of the anatomy of the root canal system is important for a correct diagnosis and related treatment, influencing its level of success. There are anatomical variations for each type of tooth, and it is noteworthy that the morphology of the root and canal varies greatly between populations, within populations and even within the same individual. Objectives: Descriptive analysis of the internal dental anatomy of mandibular premolars and molars in a population, using cone beam computed tomography from the FMDUCP Clinic database. Materials and Methods: Tomographic images in which the lower premolars and molars were in the mouth were selected. The images included in the study were correlated according to the Vertucci classification and analyzed the prevalence of extra roots and canals, molars with Cshaped canals, presence of Radix entomolaris and paramolaris. A descriptive analysis of the types of teeth evaluated and the characteristics mentioned above of each group of teeth was carried out. Results: In a sample of 40 CBCTs, 151 teeth were analyzed. Most of the 1st and 2nd premolars had only one canal and most of them had a Vertucci type I morphology; The 1st and 2nd molars had mostly 3 canals, type IV according to Vertucci's classification, in the mesial root and in the distal root type I; Most of the 3rd molars had 3 canals with a canal morphology of the mesial Vertucci root type II and on the distal root all teeth were Vertucci type I. The incidence of C-Shaped teeth in the first and second premolars was the same, with the mandibular second molars showing the highest incidence of this variation. It was not possible to observe the presence of Radix Entomolaris and Paramolaris. Conclusions: Adequate knowledge of the canal anatomy is very important for the success of endodontic treatment. The dentist must be aware of the complexity of the root canal anatomy using the latest and most reliable diagnostic tools to achieve more reliable and favorable treatment results.
Fernandes, Cristóvão Luís Rodrigues. „Anatomia do primeiro molar inferior“. Master's thesis, 2019. http://hdl.handle.net/10284/8414.
Der volle Inhalt der QuelleIntroduction: The correct endodontic treatment depends not only on the skill and technique of the dentist, but also on the anatomical scientific knowledge of all different types of teeth. Objective and Methodology: A narrative bibliographic review will be done on the main anatomical characteristics and methods of study of the anatomy of the first mandibular molar, as well as their anatomical variations, both at the root level and at the level of the root canal system. Being one of the teeth with the highest incidence of endodontic treatment, it is essential to have a great knowledge of its internal and external anatomy, thus increasing the effectiveness of its treatment and reducing the iatrogenic risks. Conclusions: The internal and external anatomical knowledge of the first mandibular molar is imperative, as well as its therapeutic approach, thus optimizing endodontic success.
Moreira, Sara Sofia Braz. „Anatomia interna do primeiro molar maxilar“. Master's thesis, 2018. http://hdl.handle.net/10284/7440.
Der volle Inhalt der QuelleIntroduction: the first upper molar is the most complex tooth and the one with the most anatomical variations of the human dental arch. Objective: the elaboration of this bibliographic review intends to demonstrate the intimate relationship between dental morphology, namely the internal anatomy of the root canal system of the first maxillary molar, and successful endodontic treatment. Methods: a bibliographic review was made using computer databases such as PubMed, Google Scholar, B-ON and Science Direct, and were included review articles and clinical cases with relevance to the scientific domain of the topic. Conclusions: the unidentified root canals during treatment become a reservoir of bacteria, so their identification being of great importance for the success of the endodontic treatment, thus demonstrating that the study of the internal anatomy of dental pieces is fundamental.
Madureira, David Eduardo Cruz. „Localização do forâmen apical do canal meso-vestibular em dentes molares maxilares e mandibulares“. Master's thesis, 2017. http://hdl.handle.net/10284/6441.
Der volle Inhalt der QuelleEndodontics is an opportunity to recover the aesthetics and functionality of a tooth that is severely damaged and is a highly recommended procedure to prevent tooth loss. Objectives: This study aims was estimate the percentage in which the distance between the anatomical apex and the apical foramen is bigger than 1mm, and evaluating the distance in statistical terms. Methods: The teeth were disinfected and prepared through the opening of an access cavity, negotiated and permeabilized with K10 lime and 5% sodium hypochlorite that allowed the blue-methylene dye to be injected into the mesiobuccal canal in maxillary and mandibular molar teeth. They were measured, stabilized and cut 1 mm from the anatomic apex. They were divided into two groups and analysed using a magnifying glass. Results: Of the 60 teeth analysed, 93.3% of the upper teeth and 96.7% of the lower teeth had a canal 1mm from the anatomic apex, P=1,000 (Fisher's exact test). The average distance in millimetres was for Me=0.5mm (95% CI:0.2-0.5) and for Me=0.2mm (95% CI:0-0.5). The minimum distance was 0.0mm and the maximum 1.7mm and 1.1mm for the upper and lower molars, respectively. Conclusions: There is no significant difference in the proportion of cases in which the distance is bigger than 1mm in both groups. The distance from the anatomical foramen of the mesiobuccal canal to the anatomic apex in the lower molars is closer (Me=0.2mm) than in the maxillary molars (Me=0.5mm).
Lucido, Vanessa. „Revisão bibliográfica sobre a anatomia pulpar da raiz mesio vestibular dos primeiros molares superiores“. Master's thesis, 2017. http://hdl.handle.net/10400.26/18919.
Der volle Inhalt der QuelleO conhecimento da anatomia radicular interna e as suas variações é fundamental para o sucesso do tratamento endodôntico. O primeiro molar superior, e principalmente a sua raiz mesio-vestibular, é um dos dentes que pode apresentar mais variação na sua anatomia interna. O comprimento da raiz mesio-vestibular, no sentido vestíbulo-palatino, e as suas concavidades relacionadas à superfície mesial e distal são características presentes na maioria das raízes mesio-vestibulares. Estas apresentam geralmente dois canais, enquanto nas raízes disto-vestibular e palatina é frequente encontrar um só canal. Podemos encontrar na literatura uma grande variação no que diz respeito à frequência do número de canais na raiz mesio-vestibular dos primeiros molares superiores. Estas variações podem ocorrer por diversos motivos como a etnia, idade, sexo e a população em estudo. Além destes factores, existe também uma grande variedade de métodos utilizados que contribuem para variações nos resultados observados. Uma das principais causas de insucesso do tratamento endodôntico é a falha na identificação adequada de todos os canais e como consequência a sua deficiente limpeza e desinfecção dos mesmos. Assim sendo, o médico dentista tem de ter conhecimentos específicos da anatomia radicular, como identificar o número de canais, detectar a sua localização, estudar a sua orientação, forma e diâmetro, a fim de poder alcançar os objectivos pretendidos de um correto tratamento endodôntico. Este conhecimento é especialmente importante em dentes cujas variações anatómicas têm sido estudadas como o caso dos primeiros molares superiores e no que diz respeito principalmente à raiz mesio-vestibular. Pretende-se com esta tese fazer uma revisão bibliográfica sobre a anatomia pulpar e suas variações na raiz mesio-vestibular dos primeiros molares superiores.
Chuang, Fu-Hsiung, und 莊富雄. „Root form and canal anatomy of mandibular second molar with C- shaped root--- The evaluations of clearing technique and radiographic examination“. Thesis, 1998. http://ndltd.ncl.edu.tw/handle/81802917803953957268.
Der volle Inhalt der Quelle高雄醫學院
牙醫學研究所
86
The mandibular second molar has many root canal varition, and theC-shaped root canal is the most interesting one. Although the reportedincidence of the C-shaped canal in the mandibular second molar is 32.9%in Chinese, the criteria for its recognition, particularly clinically, are ambuguous. To data, there has been no morphological or radiographic examinations of the C-shaped root in mandibular second molar. The purpose of this study was to use two different methods of evaluation to study this specific canal variation. Total 100 extracted human mandibularsecond molars with C-shaped root were classified and prepared as theaccess opening. After the radiographic examination at two direction withfile negotiated the canal, the teeth were dimineralized and rendedtransparent by clearing agent. Ink was injected to canal system todetermine the root canal morphology. The results illustrated that C-shapedcanals in mandibular second molars with C-shaped roots can vary innumber and shape. Five types of C-shaped root was established. Eighty- nine percent of the C-shaped teeth have continuous C or semicolon pulp chamber floor configuration. Thirty-two percent of the samples havesemicolon canal, and contiunous C type existed twenty-six percentage.Thirty-nine percent of the C- shaped teeth without C-shaped orifice examined were found to have C-shaped canal.Fifty-six percent of thesamples displayed two apical foramen. The radiographic examinationcannotbe the guide alone for the diagonsis of C-shaped canals.
Garbedian, Justin. „The Relationship of the Lingual Nerve to the 3rd Molar Region: A Three Dimensional Analysis“. Thesis, 2009. http://hdl.handle.net/1807/18305.
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