Some chemical components from liquid diet, month washes and dental bleaching agents can alter the superficial microhardness of laboratory composite resins. This issue is not widely explored in the literature. Therefore, the present study will investigate the effect of different solutions on the superficial microhardness of laboratory composite resins. Five different brands of laboratory composite resins will be assessed: Adoro, Resilab, Cristobal, Sinfony and Epricord. For each type of resin, 10 samples will be submitted to eleven different types of solutions: 4 month washes (Listerine, Oral-B, Plax, Periogard), 4 liquid diet (coke, wine, coffee, and orange juice) and 3 dental bleaching agents (16% carbamide peroxide, 7.5% and 38% hydrogen peroxides), and artificial saliva (control). Microhardness (Knoop) will be tested using a microdurometer at baseline, and after 12, 24, 36 and 60 hours of immersion in month washes; after 7, 14 and 21 days of immersion in liquid diet; and after 7 and 14 days of immersion in bleaching agents. Data will be submitted to the adherence test to the normal curve, and an appropriate statistical test will be used to compare the mean values of the variables (Knoop) among the groups.
News published in Agência FAPESP Newsletter about the scholarship: