Adhesion evaluation of a new self-cured resin to sclerotic dentin

Recently, a self-curing dental composite (Stela) was developed, promising several advantages and indications. One of them includes the restoration of Class V cavities. However, non-carious cervical lesions (NCCLs) frequently present sclerotic dentin as a substrate for adhesion. Thus, the objective of this in vitro study was to evaluate the bond strength of this material on bovine sclerotic dentin through a shear bond test (SBS), comparing it with a universal self-etching adhesive system with 10-MDP, which is considered to have the best adhesive performance in this situation (Single Bond Universal). In parallel, the effect of airborne-particle abrasion (APA) on the performance of the two adhesive systems was evaluated and whether it affected them differently. Four groups were tested: Stela (S), APA + Stela (APAS), Universal (U), and APA + Universal (APAU), each one with 12 specimens. In addition, the type of fracture and scanning electron microscopy (SEM) of representative specimens of the groups were evaluated. Shapiro-Wilk indicated a normal distribution of the data. The results were evaluated using two-way ANOVA, with a significance level of 5%. The analysis showed no statistically significant difference in the performance of the two adhesives. Additionally, APA increased the adhesive strength of both adhesives, and there was no significant interaction between APA and the two adhesives tested. The results obtained by analyzing the fracture type and SEM also showed a similar pattern. Stela Primer showed SBS values to sclerotic dentin similar to Single Bond Universal.