Efeito da termociclagem e desinfecção sobre a microdureza e estabilidade de cor de resinas acrílicas para base de prótese total

• Autor(a) principal: Baptista, Gabriella Trunckle [UNESP]
• Data de Publicação: 2010
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149310; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-25/000850928.pdf
• topic: Resinas acrílicas; Desinfecção; Cor; Acrylic resins

The hygiene care of dentures and oral mucous tissue in edentulous has a great importance in both general health and social intimacy. However, physical qualities such as color and microhardness of the acrylic resins of dentures can be altered through either its continuous use or the disinfection methods. Thus, the purpose of this work is to assert the influence of the thermal cycling and the disinfection on the color stability and microhardness of acrylic resins used in dentures. Four different types of acrylic resins were evaluated: Onda Cryl, QC 20, Classic and Lucitone. Each resin was divided into 4 groups (n=7). Each group was submitted to a type of disinfection (efferdent, hypochlorite 1%, chlorhexidine 4%; microwave energy). After the polymerization, all the samples were submitted to thermal cycling for 1,000 cycles, with 60-second alternating baths between 5±1°C e 55±1°C. After this period the samples were stored and disinfected for 60 days, when a new thermal cycling procedure for 1,000 was carried out. The microhardness was measured through a microdurometer and the color reading was done by a spectrophotometer, using the CIE L*a*b* system. The color reading and the microhardness measurement were made in the initial period and after each thermal cycling and disinfection period. The obtained data were submitted to analysis of variance (ANOVA), in order to verify the existence of differences among the variables of this study and if any difference were recognized, an appropriate test would have been applied to identify the group in which the difference occurred