Fit of metal-ceramic crowns

Aim: To evaluate the influence of cobalt-chromium (Co-Cr) coping fabrication methods and ceramic application on marginal internal fit metal-ceramic crowns. Methods: Co-Cr copings for crowns were prepared by lost wax casting or CAD-CAM machining sintered blocks. The was analyzed using silicone replica technique at four assessment points: gap (MG), axial wall (AW), axio-occlusal (AO) angle, central occlusal (CO) wall. After initial analysis, ceramic-veneered with layering technique, again determined. Data statistically paired unpaired Student’s-t test (α=0.05). Results: Marginal before according to manufacturing method showed significant differences only CO (p < 0.001), milled (137.98±16.71 μm) showing higher values than cast (112.86±8.57 μm). For copings, there MG (before 109.13±8.79 μm; after 102.78±7.18 112.86±8.57 104.07±10.63 when comparing firing. difference AO 116.39±9.64 108.54±9.26 Conclusion: This study demonstrated that influenced fit. Ceramic firing maintained improved discrepancy all restorations, firing, can be considered clinically acceptable.