Recently patients demand their esthetics on their dentition more severely. Dentists have to reveal natural color on their metal ceramic restorations in limited thickness. The purpose of this investigation is to spectrophotometrically evaluate the effects by varying opaque thickness and shade.
Conclusion: 1. The masking effects by only opaque porcelain were adequate on all samples of 0.3 mm opaque thickness. Some were adequate and the others were inadequate on samples of 0.2 mm opaque thickness.
They were inadequate on all samples of 0.1 mm opaque thickness.
2. CIE Lab color coordinates of each opaque material were not so characteristic as they were told up to date.
3. The color of A 1 (D 3), B 1 and C 1 opaque materials was alike.
