Análise da rugosidade e morfologia superficial de resinas compostas microhíbrida e nanoparticulada submetidas a degradação em substâncias ácidas e alcoólicas

Abstract

Composite resins have been modified in terms of their composition, seeking to improve both aesthetics and their properties. These modifications can occur in the organic and/or inorganic portion of the material. The aim of this study was to evaluate the surface roughness and morphology of micro-hybrid and nanoparticulate composite resins stored for 60 days in acidic and alcoholic solutions present in the diet. One hundred specimens, fifty of each resin, were made using individualized Teflon matrices. The composite resins were inserted into the matrices and photoactivated, obtaining the specimens, which were divided into two groups: Filtek Z250 XT (micro-hybrid) and Filtek Z350 XT (nanoparticulate). Each group was subdivided into five, according to the tested solutions: artificial saliva, orange juice, cola-based soda, red wine and whiskey. The specimens were evaluated initially and after 15, 30, 45 and 60 days of storage for surface roughness. Data were statistically evaluated using the Kruskal-Wallis analysis (p<0.05) complemented by the ANOVA test and the Tuckey post-test (α= 0.05). The specimens from both groups did not observe a statistically significant increase in surface roughness in any of the solutions. Artificial saliva was the medium that promoted more stability to the resins (p=0.09). Despite the absence of roughness found, further studies are needed to evaluate the results in longer exposure times, as well as simulating the protective factors of saliva in the oral environment. Based on the results obtained, it is concluded that the microhybrid composite resins Filtek Z250 XT and nanoparticulate Filtek Z350 XT did not increase their roughness after exposure to acidic and alcoholic solutions present in the diet at the end of 60 days of evaluation.