Influence of removing excess of resin-based materials applied to eroded enamel on the resistance to erosive challenge

Abstract Objectives The aim of this study was to evaluate the effect of removing excess of resin-based materials applied to eroded enamel, subjected to erosive challenge. Methods Bovine enamel blocks were immersed in HCl 0.01 M, pH 2.3, for 30 s under agitation at 50 rpm in room temperature, in order to form a softened erosion lesion. The blocks were then randomly divided into eight groups ( n  = 12) and treated as follows: Cn- and Ce-control without treatment, Hn- and He-fissure resin sealant (Helioseal Clear ® ), An- and Ae-self-etch adhesive (Adhese ® ), In- and Ie-infiltrant (Icon ® ); being n -with excess removal and e-without excess removal of the material. After application of the materials, the blocks were immersed in HCl for 2 min, followed by immersion in artificial saliva for 120 min. This cycle was repeated four times a day for five days. Material thickness and enamel wear were assessed using profilometry. Data were analyzed by two-way ANOVA and Tukey’s test ( P  Results Groups He, Ae, and Ie resulted in the formation of a layer of material over enamel, being similar effective in inhibiting erosion progression ( P  > 0.05). Groups Hn, An, and In (with excess removal) were similar to controls (Cn, Ce) and resulted in near enamel loss after application and after erosive challenge ( P  > 0.05). Conclusions Resin-based materials are able to protect enamel against erosion only when they are present over enamel, as a physical barrier. Clinical significance The resin-based materials demonstrated potential to prevent the progression of erosion lesions when the material remains on the dental surface.