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Previous issue date: 2016-11-30 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / The purpose of this study was to evaluate the influence of Co-Cr dental casting alloys presenting distinct melting ranges for compound casting technique, with lower and higher melting temperature, on the marginal adaptation of prefabricated cast-to implant cylinders for implant support prosthesis. Two cobalt-chromium base metal alloys were cast to prefabricated Co-Cr cast-to implant cylinders. The cylinders were placed in the abutments and mounted in epoxy resin. Three groups were formed according with base alloy. Group 1: Cylinder as manufactured (Control); Group 2: lower melting temperature alloy; Group 3: higher melting temperature alloy. The specimens were ground to their central portion longitudinally by a surface grinding machine, polished and evaluated by optical and scanning electron microscopy. The images were analyzed and the misfit areas between the cylinders and abutments were, if present, measured. For statistical evaluation of misfit areas ANOVA multivariate analysis and Tukey tests were used. Pre-fabricated cast-to cylinders which received higher melting temperature alloy showed significant differences in terms of marginal misfit. No significant differences were observed comparing the control and the lower melting temperature alloy group. Co-Cr casting alloy with a higher melting temperature cast on prefabricated Co-Cr implant cylinders might induce greater marginal misfit areas. The selected alloy for compound casting must not exceed the melting temperature of prefabricated implant cylinder base as recommended by manufactures. / O objetivo desde estudo foi analisar se os diferentes pontos de fus?o de ligas de cobalto-cromo (Co-Cr) para sobrefundi??o podem influenciar na adapta??o marginal de cilindros pr?-fabricados para pr?tese implantossuportada. Duas ligas met?licas de Co-Cr com pontos de fus?o distintos indicados pra t?cnica de sobrefundi??o foram fundidas aos cilindros pr?-fabricados com base de Co-Cr. As amostras foram confeccionadas, fixando os cilindros aos pilares e embutidas em resina ep?xi, formando tr?s grupos de acordo com a liga utilizada. Grupo 1: controle (cilindros de f?brica); Grupo 2: liga de Co-Cr com menor ponto de fus?o (LMT); Grupo 3: liga de Co-Cr com maior ponto de fus?o (HMT). As amostras foram seccionadas longitudinalmente na por??o central do conjunto por uma m?quina de precis?o, polidas e encaminhadas para avalia??o por microscopia eletr?nica de varredura ?ptica. As imagens foram analisadas e verificadas a presen?a de desadapta??es. Cada ?rea de desadapta??o entre cilindro e pilar foram medidas. Os resultados demonstraram signific?ncia (p<0.005) para o grupo em que os cilindros pr?-fabricados foram sobrefundidos com a liga de maior ponto de fus?o apresentando ?reas de desadapta??o marginal ao pilar. O grupo HMT demonstrou valores m?dios para ?rea de 2,489 ?m2 (?1,073), o grupo LMT de 1,536 ?m2 (? 0,375) e enquanto o grupo controle de 1,272 ?m2 (? 0,577). Para as medidas de estabilidade dimensional n?o foram observadas diferen?as estat?sticas (p>0.005) entre os grupos experimentais. Contudo, indica-se que para sobrefundi??o de cilindros pr?-fabricados a liga met?lica utilizada n?o deve possuir ponto de fus?o acima do preconizado pelo fabricante do cilindro.
| Identifer | oai:union.ndltd.org:IBICT/oai:tede2.pucrs.br:tede/7937 |
| Date | 30 November 2016 |
| Creators | Fulginiti, Roberta Limeira |
| Contributors | Teixeira, Eduardo Rolim |
| Publisher | Pontif?cia Universidade Cat?lica do Rio Grande do Sul, Programa de P?s-Gradua??o em Odontologia, PUCRS, Brasil, Escola de Ci?ncias da Sa?de |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Biblioteca Digital de Teses e Dissertações da PUC_RS, instname:Pontifícia Universidade Católica do Rio Grande do Sul, instacron:PUC_RS |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -8096554818733665164, 500, 500, 600, -2070498469879244349, 2075167498588264571 |
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