Efeito dos agentes clareadores na microdureza e rugosidade de compósitos restauradores selados

• Autor(a) principal: Fernandes, Renan Aparecido [UNESP]
• Data de Publicação: 2013
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149519; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-27/000857135.pdf
• topic: Clareamento dental; Resinas compostas; Clareadores dentários; Teeth bleaching

The aim of this study was to evaluate the microhardness and surface roughness of composite resins before and after tooth bleaching procedures. Sixty specimens were prepared for each composite (Supreme XT and Opallis), and in half of the specimens Biscover LV surface sealant was applied. Thirty enamel samples were obtained from the buccal and lingual surfaces of molars and were used as control. The surface roughness and microhardness were perfomed before and after bleaching procedures with 35% hydrogen peroxide or 16% carbamide (n=10). Data were analyzed by two-way repeated measure ANOVA and Fisher PLSD test (p<0,05). The results show that hydrogen or carbamide peroxide did not cause significant change in the hardness or surface roughness of composite resins, regardless of surface sealant application (p>0.05), and cased a significantly decreased in the hardness values for the tooth samples (p<0,05). In the surface roughness, it can be observed that the bleaching processes did not promoted any change (p>0.05), with the exception of Opallis composite, which showed an increase in the surface roughness after bleaching with carbamide peroxide. Dental bleaching did not cause modifications in hardness or surface roughness of composites, independent of surface sealant application. The microhardness and surface roughness of teeth and composite resin Opallis were influenced by whitening procedures