The Effect of Resin Composite Inlay thickness on Dentin Bond Strength and Nano-Leakage of a Dual-Cure Resin Cement

Abstract

This study was conducted to evaluate the effect of different thicknesses of chair-side resin composite inlay material on shear bond strength and nano-leakage of chemically-cured adhesive/dual-cured resin cement. For shear bond strength testing, 100 bovine permanent anterior teeth were used. Subsequent to teeth grinding and formation of smear layer, the teeth were randomly divided into four experimental groups (n= 25 teeth/group). For Groups 1-3, the resin cement was light cured through 2 mm, 4 mm and 6 mm thick resin composite cylinder respectively. While Group 4, the resin cement was left to cure chemically with the self-etching adhesive (Co-cure). After adhesive application, each dentin specimen received one pre-cured resin composite cylinder. Specimens were stored in 100% relative humidity for 48 hours. SBS test was run at a crosshead speed of 0.5 mm/min using a universal testing machine. For nano-leakage testing, 12 bovine teeth were assigned into 4 groups (n = 3) as for SBS testing. Each bovine tooth received one pre-cured resin composite disc. Specimens were immersed in silver nitrate solution and were evaluated using SEM operated in the backscattered mode to detect dye penetration. For resin dentin interface, specimens were examined using SEM. Statistical analysis was performed using One-Way ANOVA/ Turkey’s HSD post hoc test.