Translucency Parameters and Masking Abilities of Monolithic CAD/CAM Ceramics.

Abstract

The purpose of the study was to compare the translucency parameters and masking abilities of different monolithic CAD-CAM ceramics placed on different colored substructures. Squared-shaped specimens (12x12x1.5 mm) were prepared from feldspathic (C), leucite (Emp), lithium disilicate (e.max), zirconia reinforced lithium silicate (VS), resin nano ceramic (LU), polymer infiltrated ceramic (VE), nanoparticle resin hybrid (GC), monolithic zirconia (TZI), and composite resin (TC) blocks (n=10). After mechanical polishing, the translucency parameter (TP) was calculated. Then, each ceramic specimen was measured on 8 substructures and the color difference between ND2 and each substrate was calculated with CIEDE2000 formula. TP values were analyzed with 1-way ANOVA and Games-Howell tests and the color differences indicating masking ability were analyzed with 2-way ANOVA and Tukey HSD tests. The highest TP was observed in TC, and followed by LU, Emp, C =GC, e.max, VS, VE, and TZI. The ∆E00 color difference values of TZI, VS, and VE on all abutment colors, except for ND9, were below the acceptable threshold value. All of the monolithic ceramic materials used in the study masked the ND1 and ND3 substrates. The ND9, representing the severely discolored or devitalized preparations, could not be masked by any of the monolithic CAD-CAM ceramics used in the study.