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The purpose of this study was to fabricate all-ceramic crbwn with a target color. The color of all-ceramic crown was analyzed by measuring the color of all-ceramic specimens made by the refractory model technique (G-Cera), and lost wax technique (IPS Empress). The ceramometal specimen was used for the target color. The color of all-ceramic specimens was measured with a small area colorimeter by translucent and reflecting methods and evaluated by the CIE L* a* b* color system.The results were as follows:1. The color of each system was different, though the same shade of porcelain was used. Both systems showed lower L* and higher b* than the target color.2. The layer of enamel porcelain had an influence on the L* value, and the layer of dentine porcelain had an influence on the L* and b* values.3. The system using the layering technique had greater changeability of colors than the system using the lost wax technique.4. It can be concluded that the luminous value must be adjusted after reproducing the yellowness to fabricate all-ceramic crown with the target color.

The Influence of the Porcelain Layering on the Color of All Ceramic Crowns.