Clinical Color Effect Investigation of All-ceramic Crowns with Resin Post-cores

Objectives: The objective of the study is to learn the influence of try-in paste and resin cement on the color of IPS Empress 2 all-ceramic crowns and the color harmony between all-ceramic restorations and natural teeth. Methods: The CIEL*a*b* values of 71 Empress 2 all-ceramic restorations of were directly taken in the mouths of 49 patients with Shade Eye Colorimeter (Shofu). The color differences between crowns cemented with transparent resin cement (Variolink ¢ò) and crowns tried-in without try-in paste, with transparent try-in paste or natural control teeth were respectively calculated and analyzed with °÷E 1.8 as a criterion. Results: The average color differences between crowns cemented with transparent resin cement (Variolink ¢ò) and crowns tried-in without try-in paste, tried-in with transparent try-in paste or natural control teeth were respectively 1.66, 1.19, 5.05. Conclusion: Try ¨Cin pastes could help imitate the color effect of corresponding resin cement. In clinical cases the color of crowns had some change after cementation. So it's better to try in the crowns with try-in pastes before cementation, in order to guarantee a satisfactory final color. In clinical cases the Empress 2 all-ceramic crowns had significant color differences with natural control teeth. Most of the difference was caused by the high bright (L*) value of crowns. The discrepancy should be corrected by selecting suitable material and adjusting fabrication technique.