Color characteristics of various computerized machinable ceramics veneered to yttria-stabilized tetragonal zirconia polycrystalline upon different hybridized techniques

Different veneering ceramics and hybridized techniques significantly altered color characteristics of ceramic veneered zirconia. Zirconia veneering with either Vm or Em appeared to produce better translucence and opalescence, with less contrast and color alteration than veneering with either Vs or Cd. CAD-fused decreased translucency, opalescence, and intensified color alteration due to t→m transformation. Nevertheless, the color alteration of ceramics veneered zirconia still rendered an acceptable limit, except for both Vs and Cd upon Cf hybridization. <b>Key words:</b>CAD/CAM, color, contrast, hybridized technique, opalescence, translucency.