Abstract
Knowledge of the relationship between thickness and shade of body porcelain and incisal porcelain is essential for producing esthetic porcelain restoration. We thus performed an experimental study to clarify the effect of thickness on shade of body porcelain and incisal porcelain. The main results were: 1) In a two-layered restorstion of opaque porcelain and body porcelain, the values of L*, a* and b* decreased with increasing thickness of body porcelain. The effect of the thickness of body porcelain on shade was strongest in A1 and weakest in C4. 2) The effect of the thickness of two-layered restoration on shade was stronger as the color number of the restoration was decreased. 3) With a three-layered restoration of opaque porcelain, body porcelain and incisal porcelain, the values of L*, a* and b* decreased with the increased thickness of inisal porcelain. The effect of incisal porcelain on shade was greater in C4 than in A1. 4) For three-layered restoration, and the thickness of incisal porcelain had a greater effect on shade than that of body porcelain.
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