Objectives: The purposes of this study were to investigate the effects of the color of luting cement in factors of the ceramic thickness and the color of the ceramic and an abutment on the final color of all ceramic restorations. Methods: Three luting cement systems (Rely ARC: A3, Panvia 21: white and Nexus 2: yellow) were used. Porcelain specimens were fabricated using IPS Empress system (shade 110 and 310) with three thickness (0.5, 1.0, and 1.5mm). The abutment specimens were fabricated by two shades of the die material (B1 and A3, 5mm thickness). The color measurements using a spectrophotometer were performed for experimented layered samples consisted with the ceramic, the luting cement and the abutment, and also for control layered samples consisted with the ceramic, a glycerin and the abutment. The color difference dE values between each experimented and control samples were calculated and ANOVA and Fisher's PLSD multiple comparison test were performed. Results: The mean dE values were more than 3.6 (linear value of clinical acceptance) for 0.5mm thickness of the ceramic and there was a significant difference between 0.5mm vs. 1.5mm and 0.5mm vs. 1.0mm for the ceramic with shade 110 (p<0.05), and 0.5mm vs. 1.5mm for the shade 310 (p<0.05). On the other hand, there was no significant difference on the mean dE values between two shades of the abutment used in this study. Panavia indicated the highest mean dE values (6.04 for shade 110 ceramic and 4.43 for 310 ceramic) and there was significant difference among three cements (PA vs. NE, p<0.05) applied for shade 110 ceramic. However there was no significant difference among three cements for shade 310 ceramic. Conclusions: In this study, the final color of the ceramic samples was affected by their thickness, shade, and the color of the luting cement.

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