Análise da penetração de H2O2 em dentes desmineralizados e submetidos a tratamento clareador

• Autor(a) principal: Costa, Fernanda Bernardi da [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/11449/149490; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-27/000856903.pdf
• topic: Clareamento dental; Peróxido de hidrogênio; Cárie dentária; Teeth bleaching

This study evaluated the H2O2 penetration and the evolution of demineralization in teeth with incipient lesions submitted to bleaching treatment. Among the selected 60 teeth, 30 had the enamel surface submitted to a cariogenic challenge in demineralizing solution and the rest remained sound. To analyze the H2O2 penetration, 15 enamel/dentin discs of each group received treatment with bleaching product based on hydrogen peroxide at 35%. During the procedure, the discs were placed in artificial pulp chambers containing acetate buffer solution. This solution was collected, processed, and submitted for analysis of optical density in Ultraviolet Visible reflectance spectrophotometer. Subsequently, three discs from each group were used for surface analysis with SEM and two others for the analysis of polarized light microscopy. The 10 remaining discs of each group were sectioned and polished for cross-sectional hardness analysis (CSH) at different depths. The data were submitted to ANOVA Repeated Measure and PLSD Fisher test at 5%. It was observed that previously demineralized teeth showed greater penetration of hydrogen peroxide (p <0.0001). After analyzing the CSH of the enamel, it was observed that bleaching caused changes to a depth of 20 μm in sound substrate, while in demineralized substrate the bleaching decreased the CSH of the enamel to a depth of 90 μm. It was concluded that the degree of the enamel mineralization could be a modulator of the bleaching agent's penetration in dental tissues and that bleaching agents contribute to the development of an incipient lesion's demineralization