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Previous issue date: 2008-04-09 / A frequently encountered difficulty in oral prosthetics is associated with the loss of metallic alloys during the melting stage of the production of metal-ceramic replacement systems. Remelting such materials could impar their use in oral rehabilitation due to loss in esthetics, as well as in the chemical, physical, electrochemical and mechanical properties. Nowadays, the Ni-Cr-Mo-Ti alloy is widely used in metal-ceramic systems. Manufacturers state that this material can be remelted without significant alterations in its behavior, however little has been established as to the changes in the performance of this alloy after successive
remelting, which is common practice in oral prosthetics. Therefore, the objective of this study was to evaluate possible changes in the esthetics and associated properties of metalceramic samples consisting of Ni-Cr-Mo-Ti and dental porcelain. Three to five remelting steps were carried out. The results revealed that Ni-Cr-Mo-Ti can be safely used even after three remelting steps. Further remelting significantly affect the characteristics of the alloys and should not be recommended for the manufacture of metal-ceramic systems / Uma dificuldade frequente encontrada na pr?tese dent?ria est? associada com a perda de ligas met?licas durante o est?gio de fundi??o na confec??o de sistemas
metalocer?micos. A refundi??o de alguns materiais pode impedir seu uso na reabilita??o oral devido ? perdas nas propiedades est?ticas, como tamb?m, nas qu?micas, f?sicas,
eletroqu?micas e mec?nicas. Atualmente a liga Ni-Cr-Mo-Ti ? bastante usada em sistemas metalocer?micos. O fabricante afirma que esse material pode ser refundido sem causar
significantes altera??es na sua qualidade, no entanto pouco foi estudado quanto ?s mudan?as nas propriedades dessa liga ap?s sucessivas fundi??es, como ? comum na pr?tica
nos laborat?rios dent?rios. Com base nisso, o objetivo desse estudo foi avaliar poss?veis mudan?as est?ticas e das propriedades das amostras metalocer?micas fabricadas com a liga Ni-Cr-Mo-Ti e porcelana odontol?gica. De tr?s a cinco etapas de fundi??o foram realizadas. Os resultados revelaram que a liga Ni-Cr-Mo-Ti pode ser usada mesmo ap?s
subemtida ? tr?s fundi??es. Refundi??es adicionais afetam significantemente as caracter?sticas da liga e n?o s?o recomendadas para a confec??o de sistemas
metalocer?micos
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12706 |
| Date | 09 April 2008 |
| Creators | Vilar, Caroline Dantas |
| Contributors | CPF:15724520800, http://lattes.cnpq.br/0022988322449627, Nascimento, Rubens Maribondo do, Martinelli, Ant?nio Eduardo |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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