ObjectiveTo evaluate the effect of erosive challenges on the tooth- restoration interface of deciduous teeth treated with different adhesive protocols.Material and MethodsDeciduous molars were cut mesiodistally, then embedded, abraded and polished (n=80). Samples were randomly divided according to the adhesive system used into: G1 (Adper Single Bond2®, etch-and-rinse), G2 (Universal Single Bond®, self-etching), G3 (OptibondFL®, etch-and-rinse with Fluoride) and G4 (BondForce®, self-etching with Fluoride). After standardized cavity preparation (2 mm diameter x 2 mm depth), adhesive systems were applied and samples were restored (composite resin Z350®). Half of the samples were exposed to erosive/abrasive cycles (n = 10, each adhesive group), and the other half (control group; n = 10) remained immersed in artificial saliva. For microleakage analysis, samples were submersed in methylene blue and analyzed at 40x magnifications. Cross-sectional microhardness (CSMH) was carried out (50 g/5 s) at 25 μm, 50 μm, and 100 μm from the eroded surface and at 25 μm, 75 μm, and 125 μm from the enamel bond interface.ResultsRegarding microleakage, 7.5% of the samples showed no dye infiltration, 30% showed dye infiltration only at the enamel interface, and 62.5% showed dye infiltration through the dentin-enamel junction, with no difference between groups (p≥0.05). No significant difference was observed in CSMH at different depths (two-way ANOVA, p≥0.05).ConclusionsWe did not observe significant changes in microleakage or CSMH after erosive/abrasive challenges in deciduous teeth treated with different adhesive protocols (etch-and-rinse and self-etching adhesives, with and without fluoride).

MSc,%Department%of%Conservative%Dentistry,%Federal%University%of%Rio%Grande%do%Sul,%Porto%Alegre,%RS,%Brazil*% MSc,%Department%of%Conservative%Dentistry,%Federal%University%of%Rio%Grande%do%Sul%(UFRGS),%Porto%Alegre,%RS,%Brazil**% MSc,%PhD,%Assistant%Professor,%Department%of%Conservative%Dentistry,%Federal%University%of%Rio%Grande%do%Sul%(UFRGS),%Porto%Alegre,%RS,%Brazil***% Correspondence:%grs.marcelo@gmail.com%(GOULART%M)%|%Received%30%Oct%2013%Received'in'revised'form%03%Nov%2013%Accepted%06%Nov%2013% % %

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Objective: The incorporation of thiourethane prepolymer (TU) into either the organic phase or as a surface treatment for filler particles in composites reduces polymerization stress and improves fracture toughness. The...