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Abstract
Purpose
The purpose of this in vitro study was to compare the marginal adaptation of a ceramic-pressed-to-metal restoration with traditional metal-ceramic restoration.
Materials and methods
Duplicating the prepared resin tooth, 20 metal dies were fabricated. Twenty metal copings of 2 groups which were metal ceramic restoration and pressed to metal restoration were fabricated. The marginal opening of each coping was measured with Microscope (BX 60M-36E 41D®: Olympus, Japan). After porcelain build-up, the marginal opening of metal ceramic restoration and pressed to metal restoration (PoM®: Ivoclar vivadent., Liechtenstein) were also evaluated in the same method. The measurements were analyzed using Wilcoxon Signed Ranks test and Mann-Whitney U test.
Results
Within the limits of this study, the results were as follows. 1. Metal-ceramic restorations in coping state (64.93 ± 12.48 μ m) in compared with Metal ceramic restorations after porcelain build-up (63.43 ± 12.86 μ m) had no significant difference in marginal adaptation. 2. Pressed-metal-ceramic restorations in coping state (50.00 ± 12.28 μ m) in compared with Pressed metal ceramic restorations after porcelain build-up (56.72 ± 13.80 μ m) had no significant difference in marginal adaptation. 3. Metal-ceramic restorations in compared Pressed-metal-ceramic restorations had no significant difference in marginal adaptation.
Conclusion
Pressed-metal-ceramic restorations have the advantage of being technically less change through using of the lost-wax technique and this allows for the convenience of a full-contour ceramic wax-up as opposed to the more technique-sensitive layering method. Pressed-metal-ceramic restorations may be considered in clinic on the basis of the result of this study and the advantage of this system. (J Korean Acad Prosthodont 2010;48:273-9)
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