Currently, manufacturers of dental resins aim to obtain a resin which can involve greater durability, with an effective dentin-resin bond. The dental resin can absorb water and chemicals from the environment, and release components for the surrounding environments. The intrusion of water in dental materials can cause deterioration of physical and mechanical properties, thus decreasing the life of the resin. Thus, both sorption and solubility leads to a variety of chemical and physical processes that can result in harmful effects in the structure and function of polymer. This study is refers to the verification of sorption and solubility g/mm 3 of two commercial resins of different compositions, as a function of immersion time, the specimen diameter and immersion environment for a period of 60 days. With the results of mass variation curves were obtained curves for sorption and solubility for each condition analyzed, whose values found for these two parameters were consistent with the limit of ISO 4049/2002. From the results obtained, analysis of the specimens by SEM were performed to follow the surface modification, in addition to thermal analysis, TGA, DTG and DSC to verify the behavior of the specimens after several immersion times with increasing temperature. HPLC analysis of immersion media of Filtek Supreme resin were done after dipping ever sample of it to check the amount and which of the unreacted monomers migrated during immersion. From the variations of mass obtained, were made correlations in order to reproduce the experimental data by equations with the variables used in this thesis; it was also made, from the variations of mass, a mathematical model for the diffusion coefficients of each resin and changing their experimental conditions. It is concluded that there was sorption of water or alcohol in the specimen and that the surface damage of the samples in ethanol was more evident compared to the water. There was also a mass loss with increasing temperature and migration of unreacted monomers specimen for the environment. With the correlation, we were able to get the equations that reproduce the experimental data and, with the aid of the mathematical modeling we found values of the diffusion coefficients ranging from 3,65 10 10 to 42,68 10 -10 cm 2 s -1 , depending on the resin, the immersion medium and the diameter of the specimen. The values found are consistent with the literature.
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