Objective: The international standard organization (ISO) evaluated the accuracy of the computer-aided-design and computer-aided-manufacturing (CAD-CAM) systems using their unique symmetry taper abutment. This study evaluated the effect of abutment shape on the accuracy of two CAD-CAM systems by using symmetry cylindrical taper die (ISO) compared with normal tooth preparation by marginal gap measurement.
Methods: The ISO taper die (ISO 12836; 2012) and plastic tooth form abutment (maxillary second premolar) were duplicated and casted with nichrome (Ni-Cr) alloy, then used as master die. Both dies were scanned and the zirconia crown coping was fabricated by two CAD-CAM systems, Cerec InLab (Dentsply Sirona Inc) and Ceramill (Amann Girrbach). The absolute marginal discrepancy (AMD) of the crowns were measured. The data were statistically analyzed by two-way Analysis of Variance (ANOVA) and Tukey’s test (α = 0.05).
Results: Cerec InLab showed a marginal discrepancy of the crown of 0.20 ± 0.03 mm in both abutment forms, and this was statistically larger than the Ceramill system (0.09 ± 0.04 mm and 0.07 ± 0.03 mm for ISO abutment and tooth form abutment, respectively).
Conclusion: The different abutment shapes did not affect the accuracy of the crown coping produced from the CAD-CAM system, whereas the different CAD-CAM systems affected the accuracy of the crown.
Cite this article as: Urapepon S, Leelanarathiwat K. Effect of abutment shape on the accuracy of two dental computer-aided-design and computer-aided-manufacturing systems. Essent Dent. 1(1): 38-42.