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

Abstract

ObjectivesThe aim of this study was to evaluate the effect of removing excess of resin-based materials applied to eroded enamel, subjected to erosive challenge. MethodsBovine enamel blocks were immersed in HCl 0.01M, pH 2.3, for 30s under agitation at 50rpm 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 2min, followed by immersion in artificial saliva for 120min. 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<0.05). ResultsGroups 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). ConclusionsResin-based materials are able to protect enamel against erosion only when they are present over enamel, as a physical barrier. Clinical significanceThe resin-based materials demonstrated potential to prevent the progression of erosion lesions when the material remains on the dental surface.