Thesis (M.S.)--University of Michigan, 2007. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 40-42, 81-83).

Thesis (M.S.)--University of Michigan, 2004. / Includes bibliographical references.

published_or_final_version / Dentistry / Master / Master of Dental Surgery

published_or_final_version / Paediatric Dentistry / Master / Master of Dental Surgery

Microleakage is an important topic in restorative dentistry. A large number of different techniques have been developed for the investigation of microleakage. However, these methodologies have been considered less reliable due to the nature of specimen preparation. The major objective of this investigation was to introduce a non-destructive technique for the study of microleakage. This objective has been partly met with the use of micro-computed tomography. By scanning the whole restoration with high spatial resolution, microleakage could be detected non-destructively and three dimensionally. In order to detect microleakage by micro-computed tomography, an X-ray contrast dye solution was developed to reveal microleakage at the tooth/restoration interface. In addition, a suitable model of tooth/cavity complex was designed in order to gain the best resolution from micro-computed tomography. Finally, with the application of advanced image analysis software, three-dimensional analysis of microleakage was achieved quantitatively and qualitatively. / http://proxy.library.adelaide.edu.au/login?url= http://library.adelaide.edu.au/cgi-bin/Pwebrecon.cgi?BBID=1295242 / Thesis (M.Sc.Dent.) -- University of Adelaide, School of Dentistry, 2007

Thesis (M.D.S.)--University of Hong Kong, 1992. / Also available in print.

Thesis (MChD(Chir. Max. Fac.-Med.))--Universiteit van Pretoria, 2000. / Also available online.

Thesis (M.Sc.Dent.)--University of Adelaide, Dental School, 2004. / "April 2004" Includes bibliographical references (leaves 73-87).

Resumo: O objetivo deste estudo foi verificar os procedimentos realizados pelos cirurgiões-dentistas durante a seleção de cor dental, analisar a prática de utilização do método visual para a seleção da cor, avaliar a diferença de cor entre a escala Vitapan Classical e diversas resinas compostas e a fluorescência de diferentes cores de uma resina composta e da estrutura dental. Sessenta cirurgiões-dentistas foram selecionados para responder um questionário referente à seleção de cor dental. Observou-se que todos os profissionais utilizavam o método visual, apenas 2 utilizavam o método digital e 52% desconheciam o método digital. Para a análise da prática de utilização do método visual de seleção da cor com o auxílio da escala Vitapan Classical foi verificada a concordância nas classificações de cor entre o consenso de dois observadores e a dada pelo fabricante da resina composta Helio Fill (Vigodent), obtendo um nível de concordância "sofrível" (k = 0,3774). Por meio do sistema CIE L*a*b* foram calculadas as diferenças de cor entre a escala Vitapan Classical e cada uma das diversas resinas compostas avaliadas. Observou-se que oito resinas compostas não diferem visualmente da escala Vitapan Classical e duas apresentaram esta diferença. Para a análise da fluorescência foram coletadas 16 imagens para cada uma das 11 cores da resina composta Helio Fill (Vigodent) e estrutura dental sob iluminação UV. Estas processadas matematicamente, quantificando a intensidade de fluorescência. Verificou-se que a cor A1 apresentou maior média de intensidade de fluorescência e a tonalidade C3 apresentou a menor. Porém, a estrutura dental apresentou valor médio inferior a todas as cores avaliadas. (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: The purpose of this study was to evaluate the procedures carried out by dentists during dental shade selection, assess the practice of the visual method to select dental shade, to evaluate the shade difference between Vitapan Classical shade guide and several composite resins, to evaluate the fluorescence in different shades of a composite resin and dental structure. Sixty professionals were selected, who answered to questions of the form about to select dental shade. The totality of the professionals selected dental shade by visual method; only 2 used digital methods; 52% did not know about the digital method. To assess the practice of the use of visual method to select dental shade, it was observed the agreement in shade classification between two examiners and the classification established by the composite resin manufacturer Helio Fill (Vigodent) which resulted in a "suffering" level of agreement (k = 0.3774). Through CIE L*a*b* system the difference of the total shade between Vitapan Classical shade guide and the composite resin was calculated and it was observed that eight of the composite resins assessed do not differ visually from Vitapan Classical shade guide, and two showed a perceptive difference to human eye. For the fluorescence analysis sixteen images were captured by the camera for the different shades of Helio Fill (Vigodent) composite resin and dental structure under UV LED illumination, and they were processed mathematically, quantifying the fluorescence intensity. It was observed that A1 shade showed the higher mean of fluorescence intensity, whereas C3 shade showed the lower mean among the composite resin shades. However, the mean intensity of dental structure was lower than those related to all the shades evaluated. (Complete abstract, click electronic access below) / Orientador: Leonor de Castro Monteiro Loffredo / Coorientador: Alessandra Nara de Souza Rastelli / Banca: Marcelo Ferrarezi de Andrade / Banca: Mônica Campos Serra / Mestre

Made available in DSpace on 2015-01-26T13:21:25Z (GMT). No. of bitstreams: 0 Previous issue date: 1997-04-11Bitstream added on 2015-01-26T13:30:30Z : No. of bitstreams: 1 000098945.pdf: 1230870 bytes, checksum: b95c5b3b1dd40f455b53a4a6753f6e98 (MD5) / Os anestésicos locais devido ao seu grande uso na odontologia, têm sido causa de inúmeros estudos na literatura odontológica, contudo a grande maioria destes avalia tão somente o tempo de duração destas drogas, ou tece comentários sobre seus efeitos tóxicos e interações sistêmicas. Com este estudo procura-se observar a existência de alteração na variação do tempo de duração de dois anestésicos, quando usados com a mesma técnica anestésica, porém em procedimentos odontológicos distintos. A metodologia consistiu na formação de dois grupos com 14 pacientes cada, sendo que o grupo um era formado por pacientes que necessitavam de bloqueio ptérigo-mandibular para exodontia dos terceiros molares inferiores, e o grupo dois constituía-se de 14 pacientes que foram submetidos à mesma técnica anestésica com intuito de tratamento em dentística restauradora. Os resultados foram analisados segundo o diagrama Blox-Plot, teste “t de Student e Mann-Whitney. A análise dos resultados revelou que: a variabilidade no tempo de duração da Bupivacaína (Neocaína) e da Prilocaína (Citocaína) é grande, porém todos os valores se incluem nas suas respectivas amostras; o tempo de duração do dois anestésicos não se encaixam na curva de distribuição normal; o tempo de duração anestésica da Bupivacaína a 0,5% com adrenalina a I:200.000 é, através do estudo das medianas, 2,2 vezes maior que da Prilocaína a 3% com Felipressina a 0,03 UI/ml; e que o tipo de procedimento odontológico, cirúrgico ou restaurador, não influi na variabilidade do tempo de duração dos dois anestésicos utilizados neste estudo / The local anesthetics due to because of the large use in dentistry have been motive of a great number of researchs, however the focus of these studies is the duration time, toxic effects and sistemic interactions. With this research we have the pourpose to observe if have alteration in the time of duration between two anesthetics when used with the same anesthetics techinic, but with distinct dental procedure. Two groups with 14 subjects each were formed: one with a necessity of lower wisdom teeth surgery, and the other that need restourative dentistry. The results obtained were analysed by the Blox-Plot diagram, t test of Student and Mann-Whitney test. The data analysis show that have a significative variability of the duration time of bupivacaine and prilocaine, but all the datas are include in the same group; the duration time of both anesthetics don't follow the normal distribution courve; the anesthetic duration of bupivacaine 0,5% with epinephrine I: 200.000 is, in the median study, 2,2 major time that the prilocaine 3% with felipressin 0,03 UI/ml; and that the odontologic procedure mode, make no difference in the variability of duration time of two anesthetics used in this study