Influence of fluoride-releasing materials in the inhibition of enamel and dentin demineralization around restoration

Objective: The aim was to evaluate the influence of fluoride-releasing restorative materials in enamel and dentinmicrohardness. Material Methods: 40 blocks (5x5x3 mm) from cervical third human molars received a cavitypreparation between dentin, restorations were subjected vitro caries model. Specimenswere randomly restored with (n=10): conventional glass ionomer cement (Ketac Cem, 3M ESPE); polyacid-modifiedcomposite resin (Ionoseal, VOCO); resin-modified (Ionofast, Biodinâmica); or microhybridcomposite (Filtek Z250, ESPE). specimens sectioned longitudinally dentinKnoop microhardness determined at different distances material (100, 200 300 um)and depth surface (20, 60 um). data submitted three-way repeated measures ANOVA andTukey´s test (a=0.05). Results: For enamel, double interactions x distance xdepth statistically significant. In all depths distances, highest values wereobserved for Ketac Cem. differed each other, Ionoseal obtained highermicrohardness than those found Ionofast. Conclusion: Conventional is more effectivein preventing demineralization around restoration followed by polyacid-modified composite resin. Indentin, better performance cement.KEYWORDSCompomers; Dental caries; Glass cements; Hardness tests; Composite Resins.