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Abstract Summary and conclusion This is invitro study was carried out to evaluate the translucency and color stability of bleached veneer shades with different resin cement. 42 IPS E-max Cad discs were fabricated with cad/cam according to manufacture’s instructions. their dimension was 10 mm in diameter and 0.5mm in thickness. They were divided into two main groups 21 each as the following: group 1: IPS E.max CAD discs shade BL1 Sub groups: “7 for each” 1. Control group samples without cement. 2. Samples with underlying resin cement shade +2. 3. Samples with underlying resin cement shade clear. group 2: (n=21): IPS E.max CAD discs shade BL3. Sub groups: “7 for each” 1. Control group without resin cement. 2. With underlying resin cement shade +2. 3. With underlying resin cement shade Clear. Samples Preparation: 42 discs shaped specimens of IPS E-max CAD with BL1 & BL3 shades will be milled by CAD\CAM 0.5 mm thickness10 mm diameter. Samples had been finished crystallization and glazing. In this study 2 different shades of resin cement NLC (+2, Clear). The specimens were cemented on PMMA discs 1mm thickness10 mm diameter shade A2 to mimic tooth, with uniform thickness of resin cement (0.1 mm) Translucency and color of all specimens was measured three times before cementation and after cementaion with two different shades of resin cement by using Cary 5000 spectrophotometer. The spectrophotometer measured color changes (ΔE) of ceramic discs according to CIE (Commission Internationale de l’Eclairage) L*a*b* system with a standard illuminant D65 in reflectance mode. Translucency parameter analysis is calculated by color difference between black (B) and white (W) background readings. TP was calculated according to the following equation: TP= [(L*B–L*W)2 + (a*B–a*W)2+(b*B–b*W)2] ½. It was found that the highest TP recorded with IPS E-max Cad shade BL1 without cement (15.19±0.61) while the lowest TP recorded with IPS Emax cad shade BL3 with cement shade +2 (10.59±0.52) the masking ability of cement is better while using IPS Emax cad shade BL1 with underlying cement shade +2 while using cement shade clear gave almost close results whether it had been used under BL1 or BL3 IPS E-max cad discs |