Masking ability of monolithic CAD-CAM laminate veneers over different resin cement shades and substrate colors.

Abstract

To compare the masking ability of monolithic CAD-CAM veneers placed over different resin cement shades and substrate colors. Veneers were milled of four different monolithic CAD-CAM restorative materials: feldspathic ceramic (VMII), lithium disilicate ceramic (Emax CAD), zirconia-reinforced lithium silicate ceramic (VS), and high translucency zirconia ceramic (YZ-XT). Veneers (n=9) were luted on natural tooth colored (ND1) or discolored substrates (ND3 or ND5) using two different resin cement shades (white opaque or translucent). Color parameters were obtained using a dental spectrophotometer before and after luting. Color differences (ΔE00) were calculated using CIEDE2000 formula and compared to perceptibility (P =0.81 ΔE00 units) and acceptability (AT=1.77 ΔE00 units) visual thresholds. Color variation data were statistically analyzed using the Kruskal-Wallis and Mann-Whitney U tests with Bonferroni-Holm correction (α=.05). The highest ΔE00 value was obtained in VMII group placed over discolored substrate, followed by the groups of Emax CAD, YZ-XT, and VS. The effect of material types on ΔE00 values was significantly observed when the veneers luted on discolored substrates using translucent resin cement (p<.05). Restorative material type, substrate color, and resin cement shade affect the masking ability of monolithic CAD-CAM laminate veneers.