The adhesives and restorative materials have been modified to improve the quality of marginal sealing of restorations. However, the clinical performance of restorations with these materials, when evaluating the longevity and the development of caries around restoration is still unclear. This project aims to evaluate the restoration-dentin bonds and the behavior of the dentin adjacent to the restorations, which will be submitted to cariogenic challenge in vitro. This study will use human teeth and 4 restorative materials (glass ionomer resin modified, as the control group and three adhesives / composite resins). For the bond strength test, it will be used coronary dentin and the microtensile test will be conducted immediately after specimen preparation and 1 year after storage in artificial saliva. For the dentin longitudinal microhardness (or internal) and for polarized light microscopy analysis, the cavity preparation will be done in the cervical region (class V), which will be restored with the 4 restorative systems proposed. The teeth will be submitted to pH cycling for 8 days. Afterwards, they will be subjected to measurement of dentin microhardness (3 distances from the cavity wall and 6 depths from the surface that was treated by pH cycling) and evaluation of the depth and area of demineralization from the images obtained by polarized light microscopy.
News published in Agência FAPESP Newsletter about the scholarship: