MICROSHEAR BOND STRENGTH OF SELF-ADHESIVE RESIN COMPOSITE TO DENTIN

Abstract

The objective of this research was to compare the microshear bond strength (μSBS) of a self-adhesive resin composite (SimpliShade™ Self-Adhesive Flow) to dentin following three different surface treatment methods. Three groups were tested: 1) no surface treatment (NS), 2) etching with 37% phosphoric acid (ES), and 3) application of OptiBondTM Universal in self-etch mode (OS). Sound-extracted human premolars were sectioned horizontally 2 mm from the central groove. The teeth were randomly allocated into three groups according to the assigned dentin surface treatment. Dentin surfaces were prepared according to the designated method, then restored with the self-adhesive resin composite, SimpliShade™ Self-Adhesive Flow. All specimens were stored in distilled water at 37°C for 24 hours. μSBS testing was performed using a universal testing machine with a wire loop method at a crosshead speed of 1 mm/min. Data were analyzed using one-way analysis of variance (ANOVA), followed by Bonferroni post hoc comparisons. The results demonstrated that dentin surface treatment had a significant influence on microshear bond strength (p < 0.001). The OS group exhibited significantly the highest μSBS compared with both the ES and NS groups (p<0.001), while the ES showed significantly higher μSBS than NS (p<0.001). The results of this study concluded that the use of SimpliShade™ Self-Adhesive Flow in combination with an adhesive system provides the highest dentin bond strength.