Influence of depth and translucency on the color matching of single-shade resin composites: An in vitro study

Abstract

Objectives To evaluate whether the depth and translucency of the restoration influence the color matching of single-color composite resins. Materials and methods Cylindrical cavities (2-and-4 mm depths) were prepared in acrylic teeth (n=10). Restorations were performed with single-shade resin composites (OC: Omnichroma, Tokuyama; VU: Vittra APS Unique, FGM) and a control multi-shade (EO: Estelite Omega, Tokuyama). The color matching was measured in instrumental analysis (CIEDE2000 color difference formula (ΔE00)) and visual analysis. The translucency of discs (2-and-4mm thickness) was obtained by ΔE00. Results Restoration depths affected the ΔE00 values of OC and VU (p<0.05). The ΔE00 values were lower for 4-mm depth and higher for OC and VU (p< 0.05). In the visual analysis, the restoration depths did not influence the color matching. No statistically significant differences were found for each resin at different depths. VU and OC showed higher translucency scores than EO. At 2 mm, OC showed higher translucency values and there was no difference between OC and VU at 4 mm (p <0.05). Conclusions The color matching of OC and VU was influenced by depth (instrumental analysis). While the OC had a similar color matching to EO at both depths, VU had the best color matching in both depths in the visual analysis. Single-shade materials had greater translucency than EO at different depths, and the translucency decreased with increasing depth. Clinical significance The results of the instrumental and translucency analysis suggest that the color matching may vary with increasing depth of the single-shade resin.