Objective: The aim of this study was to analyze the influence of the amount of shade pigment and opacifying components in the polymerization and mechanical properties in two brands of Brazilian dental resin composites.
Material and Methods: Master Fill microhybrid resin for enamel (colorless and shades A2, A4), and Opallis for enamel and dentine, both shades A2. The composite resins were photopolymerized by a LED device at 19.7 J. The mechanical properties were obtained through flexural resistance (FR), compression strength (CS) and Vickers microhardness (VM); the degree of conversion (DC) was obtained by FTIR and translucence was obtained by sphere espectrometer.
Conclusion: The analysis indicated that resin with more color pigments (MA4) or more opacity components (ODA2) had low polymerization and poor mechanical properties than clearer (M) or more translucent (OEA2) resins, indicating that better performance can be obtained by increasing the radiation dose.