Effect of time on the post-irradiation curing of six resin-based composites

To evaluate the effect of time on the Vickers microhardness (VH) at the top and bottom surfaces of six conventional resin-based composites (RBCs) up to twelve weeks after light curing. Five specimens of Filtek Supreme Ultra, Herculite Ultra, Mosaic Ultra, Tetric EvoCeram, TPH Spectra HV, and Venus Pearl were packed into opaque molds that were 2.3mm in diameter and 2.5mm deep. The uncured RBC specimens were covered by a polyester strip and photo-cured with an Elipar DeepCure-S light-curing unit (LCU) according to the manufacturer's instructions. After irradiation, the polyester strip was removed, and the Vickers microhardness was measured immediately at top and bottom surfaces. The hardness measurements were repeated after 30min, 1h, 2h, 4h, 24h, 1 week, 4 weeks, and 12 weeks. In between, the specimens were stored in dry and dark conditions at 37°C. Two-way ANOVA (α=0.05) followed by Tukey–Kramer post hoc multiple comparison tests were used to determine where statistically significant differences existed. The micro-hardness values at the top surface always exceeded those at the bottom surface. A significant logarithmic increase of the micro-hardness due to post-irradiation curing took place between 30min and 24h (p