Abstract
The accuracy of the partial veneer crown margins is very important to dentists, and especially in the case of partial veneer crown which has longer margin, an incomplete or inaccurate marginal fit can be key to the longevity of case gold restorations.Thirty extracted maxillary premolars with smooth axial surface free of defects were selected. An MOD onlay preparation was completed in each specimen, and a wax pattern was fabricated directly on the tooth. A type IV casting alloy was used. The effectiveness of four different marginal finishing techniques was evaluated. The results of this study indicate:1) The adaptation of horizontal margins was significantly inferior to that of vertical margins prior to cementation.2) About 2 μ for marginal opening was obtained by using the burnishing technique with Spratley knife and white polishing stone.3) Burnishing produced a significant improvement in marginal adaptation when compared with the untouched margin. The burnishing technique with Spratley knife and white polishing stone was significantly superior.4) Burnishing during cementation with Spratley knife and white polishing stone was not significantly effective.
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