Orientador: Cassio Menezes Raposo do Amaral / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Ciências Médicas / Made available in DSpace on 2018-07-22T06:33:15Z (GMT). No. of bitstreams: 1 Julio_GersonLuiz_M.pdf: 7919698 bytes, checksum: f5d5850d539fb8cc26a5f9155f7be8b9 (MD5) Previous issue date: 1996 / Resumo: Realizou-se um estudo experimental comparativo com minipróteses de silicona, cotejando-se duas superficies de revestimento, o elastômero e o poliuretano, para verificar as respostas histológicas ocasionadas por cada uma delas. Foram utilizadas 144 minipróteses de silicona, com 2ml de silicona gel no interior, metade delas cobertas com poliuretano e a outra metade, com elastômero. Foram utilizados 36 ratos Wistar e em cada animal foram implantadas quatro minipróteses, sendo duas de superficie de elastômero e duas de elastômero revestido de poliuretano. Os animais foram separados em quatro grupos e observados, respectivamente por 2, 5, 8 e 11 meses. Durante esses períodos, foram mantidos em biotério, depois foram sacrificados e o material recolhido submetido à análise histológica. Concluíu-se que as minipróteses de poliuretano promovem uma resposta celular ativa, com presença de células gigantes, processo inflamatório crônico e disposição anárquica das fibras de colágeRo. As minipróteses revestidas de elastômero promovem uma resposta celular estável, com disposição linear das fibras de colágeno. Observou-se também, na cápsula proveniente das minipróteses de poliuretano, a presença de material amorfo, compatível com cristais deste polímero / Abstract: We did a experimental study with miniprosthesis of silicone, comparing two specific covers, elastomer and polyurethane; observed the histologic responses each one, with comparative analyses. We used 144 miniprosthesis with two mililiters of silicone gel, 77 with polyurethane cover and 77 with elastomers coveF in 36 rats. Each animal received four prosthesis, two of poliurethane cover and two of elastomer cover . The animaIs were observed for 2, 5, 8, 11 months. During that time they stayed in the bioterio and after were 'sacrified and the material analysed by optic microscopy. We conclued that miniprosthesis with< polyurethane cover, had the active tissular and celular responses, with giant cells, cronic inflamatory process and anarquic disposition of colagen fibers. In the capsula we observed the specif material, like the poliuerathne crystal. The elastomers cover results in the stable celular and tissular responses, and the linear disposition of colagen fibers / Mestrado / Mestre em Cirurgia

No description available.

No description available.

Orientador: Marcelo Coelho Goiato / Abstract: The purpose of this study was to analyse the influence of time exposure to the environmental factors, chemical disinfection with 2% chlorhexidine-based solution and two distincts pigments about dimensional changing and maintenance of details of two silicones for use in maxillofacial prosthesis. Thirty specimens were fabricated for each silicone using a matrix, conformed closely to the specifications for nonaqueous, elastomeric dental impression materials established by the Revised American Dental Association n° 19 and the ISO 4823:1984. Specimens were separated in three groups: control (colourless), pigmented with commercial cosmetic (makeup powders) and pigmented with iron oxid. Specimens were analysed in a comparator microscopic (Carl Zeiss) and stereoscopic loupe. The readings were realized after polymerization of the specimens, and after 30 and 60 days, with and 157 without disinfection. The data were submited to the statistic analysis, by the Tukey's Test. The results indicated that all groups presented contraction; the chemical disinfection only changed the dimensional stability of the Silastic cosmetic pigmented group; the dimensional stability of Silastic was affected after 60 days of exposition in all groups. For the Brascoved silicone, the chemical disinfection only didn't have influence about dimensional stability in initial period; the exposition factor had influence about the dimensional stability of Brascoved in all periods and groups. The details were maintained in all specimens for both silicones, independent of the exposition time, of the pigments or disinfection. / Mestre

Orientador: Marcelo Coelho Goiato / Banca: José Eduardo Rodrigues / Banca: Humberto Gennari Filho / Banca: Mário Alexandre Coelho Sinhoreti / Banca: Aimée Maria Guiotti / Resumo: Este estudo teve como objetivo avaliar a absorção, solubilidade, dureza e alteração de cor de reembasadores resilientes após termociclagem. Foram utilizados 4 materiais reembasadores resilientes, sendo 1 à base de resina (Trusoft) e 3 à base de silicone (Dentusil, Ufi Gel P e Ufi Gel SC). Foram confeccionadas 80 amostras no total, sendo que metade delas foi submetida ao teste de absorção e solubilidade e a outra metade, aos testes de dureza Shore A e alteração de cor. Todas as amostras foram submetidas à 2000 ciclos de termociclagem. O Dentusil apresentou os seguintes valores: Shore A (40,50); ΔE (0,83); absorção (0,30); solubilidade (0,01). Já o Trusoft apresentou os seguintes valores: Shore A (18,50); ΔE (3,92); absorção (1,48); solubilidade (1,26). O UfiGel P e SC apresentaram resultados semelhantes e intermediarios para os 3 testes. Portanto conclui-se que todas as propriedades estão intimamente relacionadas e que quanto maior for a dureza inicial do material, menor será a absorção e solubilidade e consequentemente menor será a alteração de cor. / Abstract: The purpose of this study was to investigate absorption, solubility, hardness and colour change of 4 soft liners after thermocycling. A resin base (Trusoft) and three silicone base (Dentusil, Ufi Gel P e Ufi Gel SC) were used on this research. A total of eighty samples were manufactured: forty for absorption and solubility test and forty for both hardness and colour change tests. All samples were subjected to 2000 hours of thermocycling. Dentusil showed the following values: Shore A hardness (40.50), colour change (ΔE=0.83), absorption (0.30) and solubility (0.01). Trusoft, on the other hand, showed the following values: Shore A hardness (18.50), colour change (ΔE=3.92), absorption (1.48) and solubility (1.26). Both UfiGel P and SC showed similar results for all three tests. All properties are linked and as big is the initial hardness, small will be both absorption and solubility and consequently small will be the colour change. / Doutor

No description available.

No description available.

Thesis (Ph.D.)--McMaster University, 2005. / Supervisor: Michael A. Brook. Includes bibliographical references. Also available online.

Thesis (M.S.)--California Polytechnic State University, 2009. / Mode of access: Internet. Title from PDF title page; viewed on October 14, 2009. Major professor: David Clague, Ph.D. "Presented to the faculty of California Polytechnic State University, San Luis Obispo." "In partial fulfillment of the requirements for the degree [of] Master of Science in Engineering, with specializations in Biomedical Engineering." "September 2009." Includes bibliographical references (p. 125-127).

Thesis (Ph.D.)--McMaster University, 2005. / Advisor: Michael A. Brook. Includes bibliographical references. Also available via World Wide Web.