Effect of Thickness on Translucency and Masking Ability of a Effect of Thickness on Translucency and Masking Ability of a Recently Developed Single-Shade Resin Composite with Recently Developed Single-Shade Resin Composite with Enhanced Opacity: An In Vitro Comparative Study

Objective: This study aimed to evaluate the effects of thickness changes on translucency and masking ability of a recently developed single shade resin composite material with enhanced opacity comparing it with a traditional opaque-shade one. Material and methods: Two brands of composite resins; Omnichroma blocker (OCB) and G-aenial Anterior (GA) in opaque A2 (OA2) shade were selected to enroll the study. Color coordinates of each composite were determined at 0.5, 1, and 1.5mm thicknesses (n=10/thickness) on four different backgrounds (white baking, black baking, C4 shade porcelain baking and the backing of material itself) by using a spectrophotometer to determine the translucency parameter (TP) and masking ability of the study materials. Data were statistically analyzed using One-way ANOVA, T-test and Tukey HSD as a post hoc for multiple comparisons (P < .05). Results: TP and ΔE* values obtained between specimens on different backgrounds decreased as thickness increased. For both materials, a black backing was masked by thicknesses of 1.5 mm, whereas a C4 porcelain backing was masked by all resin thicknesses. Conclusion: In relatively thin thicknesses (≤1mm), both composites could not mask the black background color. On the other hand, they could mask C4 porcelain background color at all thicknesses