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RESUMO Foi avaliada a rugosidade superficial de resinas compostas, antes e apos a sua imersao em solucao aquosa com diferentes pHs e solucao enzimatica. Foram confeccionados 60 corpos de prova, 30 para cada material, com auxilio de uma matriz de acrilico com 5mm de diâmetro e 2mm de espessura, as quais foram preenchidas com as resinas compostas Filtek Z350 e Empress Direct, em unico incremento e realizada a fotopolimerizacao por 40segundos. Os corpos de prova foram divididos em06 grupos (n=10) de acordo com a solucao empregada: agua deionizada (Grupos ZA e EA); hidroxido de sodio com pH 13.2 (Grupos ZNa e ENa) e solucao enzimatica de colesterol esterase (Grupos ZE e EE). Para dar acabamento utilizou-se uma sequencia decrescente de granulacao de lixas d’agua: 600, 1000, 1200, 1500 e 2000 e para o polimento, suspensoes de alumina: 1µm, 0,3µm e 0,05µm. Apos o polimento foram armazenados em estufa a 37°C durante 7 dias, para entao realizar 3 medicoes de cada superficie no rugosimetro. Os corpos de prova foram imersos saparadamente nas solucoes por 30 dias e mantidos em estufa a 37°C, a cada 7 dias as solucoes eram trocadas. Apos 30 dias foram realizadas mais 3 medicoes da rugosidade das superficies. Os resultados foram tabulados e submetidos a analise estatistica com os testes ANOVA e Tukey. Pode-se concluir que: As resinas compostas testadas apresentaram degradacao hidrolitica na solucao aquosa apos um periodo de imersao de 30 dias, fato que nao foi observado nas solucoes de NaOH e Esterase. ABSTRACT The surface roughness of resin before and after their immersion in aqueous solutions with different pH and the enzyme solution was evaluated. They were made 60 specimens, 30 for each material with the aid of an acrylic matrix with 5mm diameter and 2mm thick, which were filled with composite resin Filtek Z350 and Empress Direct in single increment and held light curing by 40 seconds. The specimens were divided in 06 groups (n = 10) according to the used solution: deionized water (ZA Groups and EA); sodium hydroxide to pH 13.2 (ZNA Groups ENA) and enzyme solution of cholesterol esterase (ZE and EE groups). To give finishing used a descending sequence of sanding granulation water: 600, 1000, 1200, 1500 and 2000 and for polishing, alumina suspensions: 1μm, 0,3μm and 0,05μm. After polishing were stored in an oven at 37 ° C for 7 days, and then perform three measurements on each surface roughness. The specimens were immersed separately solutions for 30 days and kept in oven at 37°C every 7 days, the solutions were changed. After 30 days there were over 3 measurements of surface roughness. The results were tabulated and statistically analyzed with ANOVA and Tukey tests. It can be concluded that: The composites tested showed hydrolytic degradation in aqueous solution after a period of 30 days immersion, a fact that was not observed in NaOH and Esterase solutions.

INFLUÊNCIA DA ALTERAÇÃO DO pH E DA DEGRADAÇÃO ENZIMÁTICA NA RUGOSIDADE DAS SUPERFÍCIES DE RESINAS COMPOSTAS