Porcelain and resin are widely used in esthetic dentistry. In the field of esthetic dentistry, the color and color stability of prosthetic materials are very important in esthetics.
In this study, porcelain and resin with the same color were used to veneer on the 3 different metal alloys. Color was evaluated by the CIE L^* a^*b^* system. The purpose of this study was to evaluate the color difference and color stability of the specimens, according to the veneered materials and types of metal alloys.
Specimens were divided into 6 groups as follows ;
Group 1 ; Porcelain on the precious metal alloy
Group 2 ; Porcelain on the semiprecious metal alloy
Group 3 ; Porcelain on the nonprecious metal alloy
Group 4 ; Resin on the precious metal alloy
Group 5 ; Resin on the semiprecious metal alloy
Group 6 ; Resin on the nonprecious metal alloy
The results obtained were as follows :
1. In porcelain specimens, L^* values showed no significant difference and a^* value of group 2 was lower than that of groups 1, 3 and b^* value of group 2 was higher than that of groups 1, 3. The ΔE^*ab values between group 1-2, group 2-3 were higher than 1.5.
2. In resin specimens, L^* value of group 6 was lower than that of groups 4, 5, a^* value of group 4 was higher than that of group 6, b^* value of group 4 was higher than that of groups 5, 6. The ΔE^*ab values between group 4-5, group 5-6 were higher than 1.5, and between group 4-6 was higher than 3.0.
3. Comparing with veneered materials, L^* values of porcelain were higher than that of resin. In semiprecious metal alloy. a^* values of porcelain were lower than that of resin. In semiprecious and nonprecious metal alloy, b^* values of porcelain were higher than that of resin. The ΔE^*ab values were higher than 6.0.
4. The color stability of resin specimen was relatively inferior to porcelain specimen.
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