Does Low LED Power Density Affect Wear Resistance of Composite?

Objective: This in vitro study assesses the initial curing light intensity effect on resin composite wear resistance. Methods: Device Ultra blue IS (DMC), that it makes possible independent commands of power density and time was selected. Four different photo activation methods were investigated: Conventional A (CA: 600mW/cm2 X 40s), Conventional B (CB: 300mW/cm2 X 80s), Pulse-delay (PD: 300mW/cm2 X 3s 3 min wait 600mW/cm2 X 37s), and Soft-start (SS: 300mW/cm2 X 10s 600mW/ cm2 X 30s). Samples were prepared and stored in the dark for one week in distilled water at 37°C prior to simulated tooth brushing. The data were analyzed by statistical tests one-way ANOVA and Tukey. Results: Ranking the abrasive wear values were as follows: CA>CB>PD>SS. Conclusion: The findings indicated that a low initial curing light intensity did not compromised the abrasive resistance of the resin composite tested.