Effects of opaque and porcelain surface texture on the color of ceramometal restorations.

This study demonstrated the difference between Hue, Chroma, and Value between Ceramco shades A3 and B1 when the porcelain and opaque textures were modified. Porcelain surface texture, whether rough or smooth, did not make a difference in Hue. However, the glossy type surface in the opaque layer shifted for shade A3 from yellow toward yellow-red, and toward yellow for shade B1. This study demonstrated that Chroma is greater for dull opaque than for glossy opaque with shade B1, but for shade A3 the statistical interaction between dull opaque and smooth porcelain texture decreased the Chroma. Value had essentially an additive effect of opaque and porcelain textures for shade A3. The smooth surface porcelain texture increased the Value of shade B1 compared to the rough porcelain surface. The interactions that occur between the texture of porcelain and opaque affecting color are complex phenomena. They may be related to the modification of light by transmission, absorption, refraction, scattering, and reflection.