Avaliação da microdureza do esmalte dental exposto a dentifrícios clareadores

• Autor(a) principal: Tosti, Simone Cristina [UNESP]
• Data de Publicação: 2012
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/149464; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2017-01-27/000855840.pdf
• topic: Dentifrícios; Esmalte dentário; Clareamento dental; Dentifrices

This study aimed to evaluate the effect of carbamide peroxide, hydrogen peroxide and silica based toothpastes on the microhardness of bovine enamel. A total of 48 dental fragments with the dimensions of 4 x 4 mm were polished. Their microhardness was initially measured (baseline) and the samples were randomly divided into four groups: GI - conventional toothpaste; GII - hydrogen peroxide based toothpaste; GIII - carbamide peroxide based toothpaste and GIV - artificial saliva immersion. After samples' polishing, they received five indentations with a static load of 25 grams during 5 seconds. Then, samples of groups GI, GII and GIII were immersed in a suspension containing toothpaste and distilled water in a ratio of 1:2 by weight during 15 minutes daily. Afterwards, the fragments were washed with running water and stored in artificial saliva at 37°C. This treatment was repeated during 21 days and then, the final microhardness of the samples was carried out. Data were submitted to ANOVA and Fisher test at 5% of significance. It was concluded that all samples treated with toothpaste exhibited microhardness reduction in which those containing peroxide had the highest reduction in microhardness