The Effect of Different Chemical Surface Treatments on Resin Cement Bond Durability to a Chair-Side Resin Composite Inlay: An In Vitro Study

Abstract

This study was conducted to evaluate the SBS durability and nanoleakage of the different chemical surface treatments on resin cement to chair side indirect resin composite material. For shear bond strength testing, 200 resin composite discs and 200 cylinders were randomly divided into 20 experimental groups (n = 10) according to the two experimental factors investigated in this study: Factor 1: The resin composite surface treatment, 10 groups and Factor 2: The storage time, 2 groups. Before bonding, the fitting surface of each resin composite specimen was treated with each chemical surface treatment as specified. Resin composite cylinders were bonded to the discs using a dual cure resin cement and light cured. Half of the bonded specimens were stored for 24 hours and the other half was stored for 1-year. SBS test was run at a crosshead speed of 0.5 mm/min. For nanoleakage testing, specimens were assigned into 20 groups (n = 2) as for SBS testing. Specimens were evaluated using SEM operated in the backscattered mode to detect dye penetration. For resin composite/resin cement/resin composite interface and surface topography, specimens were examined using SEM. Surface microhardness was evaluated using Vickers microhardness tester. Statistical analysis was performed using Two-Way ANOVA/ Turkey’s HSD post hoc test. The results showed that Two-Way ANOVA revealed that surface treatment, storage time and their interactions showed a significant effect on shear bond strength (P<0.001). For 24 hours, only, the HP+S showed the highest significant SBS values among all tested groups. All groups were shown statistically significant drop in SBS after 1-year storage period. Nanoleakage results showed tracer penetration at the resin composite resin