Abstract
ObjectivesTo 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. MethodsFive 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. ResultsThe 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<0.05). There was no significant increase in the VH after 24h. Depending on the RBC, compared to the immediate values the hardness 24h post-irradiation had increased by 11–27% at the top surface and by 21–58% at the bottom. SignificanceEven after 12 weeks, the bottom hardness values never reached the top microhardness values. The results of studies that wait 24h or longer before measuring the properties of RBC specimens will be significantly enhanced by the impact of post-irradiation curing. Especially within the first 4h, the time when specimens are measured is critical information and should be reported.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call