Marginal Adaptation of Monolithic High-Translucency Versus Porcelain-Veneered Zirconia Crowns

Purpose: To compare the marginal adaptation of monolithic high-translucency zirconia crowns and porcelain-veneered zirconia crowns. Materials and Methods: A master die was scanned to design and produce 10 porcelain-veneered zirconia copings for layering (PVZ group) and 10 monolithic high-translucency zirconia crowns (HTZ group). The mean vertical marginal gap in both groups was measured from eight predetermined points using a digital microscope. Results: The mean marginal gap in the PVZ group (39.62 +/- 18.98 mu m) was significantly higher than in the HTZ group (23.54 +/- 7.57 mu m) (P < .05). Conclusion: High-translucency monolithic zirconia crowns had better marginal fit than porcelain-veneered zirconia crowns. Both groups exhibited clinically acceptable marginal discrepancies.