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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
41

Material obturador de canal radicular à base de uretano metacrilato : estudo histológico e da infiltração coronária em dentes de cães /

Avendaño Rueda, Julio César. January 2006 (has links)
Orientador: Léa Assed Bezerra da Silva / Resumo: O objetivo deste estudo foi o de avaliar a biocompatibilidade e a infiltração no sentido coroa/ápice de um cimento obturador de canais radiculares à base de uretano dimetacrilato denominado Endo-Rez. Foram utilizados 56 canais radiculares de dentes de cães, os quais foram divididos em 4 grupos experimentais: Grupo I, Endo-Rez com restauração coronária (18 raízes); Grupo II, Sealapex com restauração coronária (10 raízes); Grupo III, Endo-Rez sem restauração coronária (18 raízes) e Grupo IV, canais radiculares obturados com Sealapex sem restauração coronária (10 raízes). Os canais radiculares foram instrumentados pela técnica clássica e obturados pela técnica de condensação lateral ativa (Grupo II e IV) e técnica de cone único (Grupo I e III). Decorridos 90 dias, os animais foram mortos e as peças submetidas ao processamento histológico. A avaliação histopatológica mostrou que os grupos I e III que foram obturados com Endo-Rez com e sem restauração coronária respectivamente, apresentaram semelhante infiltrado inflamatório periapical crônico de grau moderado/severo, severo aumento do espaço periodontal apical e ausência de selamento biológico apical. O grupo IV, obturado com Sealapex, aberto ao meio bucal por 90 dias, apresentou características histopatológicas similares aos grupos I e III. O Grupo II, cujos canais radiculares foram obturados com o Sealapex com restauração coronária ocorreu infiltrado inflamatório moderado e espessamento do espaço periodontal apical predominantemente leve, na maioria dos espécimes, exibindo selamento apical biológico em apenas 1 caso, portanto 10% dos espécimes. / Abstract: The aim of this study was to evaluate in vivo the biocompatibility and coronal leakage of a new urethane metacrylate resin-based sealer, EndoRez. Sixty root canals of dog's teeth were divided into four experimental groups. Group I and III, EndoRez with and without coronal obturation respectively, Group II and IV Sealapex with and without coronal obturation respectively. The teeth were instrumented with a classic technique with Groups II and IV filled by the lateral condensation active technique with gutta percha points, while groups I and III were filled by the single cone technique. After 90 days, the animals were killed and specimens prepared histopathologically. The histopathological evaluation showed in the Groups I and III filled with EndoRez and the Group IV filled with Sealapex, most specimens with severe and moderate chronic inflammatory infiltrate, severe thickness of periodontal ligament and the apical sealing absence, Whereas, in Group II filled with Sealapex, most specimens showed mild and moderate inflammatory infiltrate, less thickness of periodontal ligament, and 30% exhibit biological apical sealing. / Mestre
42

Microleakage in retrograde amalgams measured in vitro with an electrochemical technique a thesis submitted in partial fulfillment ... in endodontics ... /

Cox, Walter W. January 1988 (has links)
Thesis (M.S.)--University of Michigan, 1988.
43

Bacterial penetration of varnish-lined amalgam restorations a thesis submitted in partial fulfillment ... pedodontics /

Harrison, Lee Moncrief. January 1964 (has links)
Thesis (M.S.)--University of Michigan, 1964.
44

Microleakage of bonded amalgam restorations

Al-Jazairy, Yousra H., January 1995 (has links)
Thesis (M. Sc.)--University of Manitoba, 1996. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
45

Bacterial penetration of varnish-lined amalgam restorations a thesis submitted in partial fulfillment ... pedodontics /

Harrison, Lee Moncrief. January 1964 (has links)
Thesis (M.S.)--University of Michigan, 1964.
46

Microleakage in retrograde amalgams measured in vitro with an electrochemical technique a thesis submitted in partial fulfillment ... in endodontics ... /

Cox, Walter W. January 1988 (has links)
Thesis (M.S.)--University of Michigan, 1988.
47

In vitro and in vivo performance of cements for crowns

White, Shane Newport. January 1900 (has links)
Thesis (Ph. D.)--University of Southern California, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
48

Microleakage of bonded amalgam restorations

Al-Jazairy, Yousra H., January 1995 (has links)
Thesis (M. Sc.)--University of Manitoba, 1996. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
49

In vitro and in vivo performance of cements for crowns

White, Shane Newport. January 1900 (has links)
Thesis (Ph. D.)--University of Southern California, 1999. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
50

Resistência de três materiais retrobturadores frente à infiltração microbiana por Enterococcus faecalis / Resistance of three root-end filling materials in teeth submitted to the microbial leakage by Enterococcus faecalis

Marcio Salles Ferreira 13 December 2011 (has links)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O objetivo deste estudo foi comparar a capacidade de selamento apical de três materiais retrobturadores em dentes submetidos à infiltração microbiana por Enterococcus faecalis. Além de analisar a ocorrência da infiltração microbiana em relação à variável tempo. Para tal, foram utilizados 45 incisivos superiores permanentes humanos extraídos, instrumentados com o sistema rotatório ProTaper Universal (MAILLEFER) e obturados pela técnica Híbrida de Tagger, com cimento endodôntico: AH Plus (DENTSPLY). A apicetomia foi realizada com a remoção de 3mm do terço apical e o retropreparo confeccionado com pontas ultrasônicas. As amostras foram subdivididas, aleatoriamente, em três grupos com 15 dentes cada, e dois grupos controles. Os materiais utilizados para a retrobturação foram MTA branco (ANGELUS), Sealer 26 (Dentsply), Palacos-R (HERAEUS KULZER). Foram confeccionados dispositivos para fixação dos dentes aos tubos Eppendorfs. As amostras foram inoculadas com cepas de E. faecalis e incubadas a 37C, por um período de 60 dias, para análise da presença de turvação do meio Enterococosel. Para a realização da análise estatística foram utilizados os seguintes testes: Quiquadrado pela correção de Yates, Prova Exata de Fisher e pela curva de sobrevivência com os testes Mantel-Cox e o Gehan-Breslow-Wilcoxon. Os resultados mostraram que todos os grupos nos quais foi realizada a obturação e a posterior retrobturação apresentaram infiltração. Comparando todos os grupos, houve diferença significativa entre o Palacos-R e o Sealer 26. Mas não houve diferença significativa entre o Palacos-R e o MTA e nem do MTA com o Sealer 26. Em relação aos materiais retrobturadores, o Palacos-R obteve a menor infiltração, seguido do MTA branco e do Sealer 26. / The objective of this study was to compare the apical sealing ability of three root-end filling materials in teeth submitted to the microbial leakage by Enterococcus faecalis. Besides analyzing the occurrence of the microbial leakage in relation to the variable time.For such, 45 incisiv permanent superior teeth extracted from humans were used, which were instrumented with ProTaper Universal system (MAILLEFER) and filled by the Hybrid of Tagger compaction technique, with endodontic sealer: AH Plus (DENTSPLY). The apices were resected with the removal of 3mm of the apical third and the root-end cavities prepared with ultrasonic tips. The samples were subdivided, randomly, in three groups with 15 teeth each, and two control groups. The materials used for the retrofilling were white MTA (ANGELUS), Sealer26 (DENTSPLY), Palacos-R (HERAEUS KULZER). Devices were made for fixation of the teeth to the Eppendorf tubes. The filling samples were inoculated with strains of E. faecalis and incubated at 37C, for a period of 30 days, for analysis of the presence of turbidity of Enterococosel medium. For the accomplishment of the statistical analysis the following tests were used: Quisquare by Yates correction, Fisher Exact Test and survival curve testing Mantel-Cox and the Gehan-Breslow-Wilcoxon. The results showed that all the groups in which the filling was accomplished and the subsequent retrofilling presented leakage. Comparing all the groups, it had significant difference between the Palacos-R and Sealer 26. But it did not have significant difference between the Palacos-R and the MTA and nor of the MTA with Sealer 26. In regard to only the root-end filling materials, Palacos-R obtained the smallest leakage, followed by white MTA and Sealer26.

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