Objective: To evaluate the accuracy of occlusal surface design methods for Cerec2 CAD/CAM all-ceramic coping crown.
Methods: Ten first molar all-ceramic crown preparations were made. Five were normal occlusion, and five were abnormal. The crown was designed by Cerec 2 CAD/CAM using three methods, namely Extrapolation, Correlation and Function, for every preparation. The Z values of mesiobuccal, mesiolingual, distobuccal, distolingual angle in marginal ridge were recorded.
Results: In the normal occlusion group, there was no statistical difference among the three occlusal surface design methods (P > 0.05). In the abnormal occlusion group, there were statistical differences between the occlusal surface design methods (P < 0.05); the function method was noted to be more accurate than the others.
Conclusion: The results indicate that the extrapolation method can be applied to patients with normal occlusion and the function method can be applied to patients with abnormal occlusion.
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