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영어

Purpose: In this study, the marginal fitness of ceramic Co-Cr metal crown made by precision casting, milling, and selective laser melting method were compared. Methods: The ceramic Co-Cr metal crown manufactured by precision casting used the lost wax(LC specimen) method. The abutment were scanned and then made by milling(CM specimen), selective laser melting(CS specimen) method. The specimen were cut bucco-lingual and mesio-distal, and absolute marginal discrepancy and marginal gap were measured using a digital microscope. The surface roughness of the crown was also observed. Results: On the bucco-lingual axial, absolute marginal discrepancy was the LC specimen 31.72(±4.58)㎛, the CM specimen 78.29(±3.28)㎛ and the CS specimen 143.13(±3.83)㎛, respectively. On the bucco-lingual axial, marginal gap was the LC specimen 22.70(±1.46)㎛, the CM specimen 22.70(±1.49)㎛ and CS specimen 99.60(±1.57)㎛, respectively. Conclusion: For ceramic Co-Cr metal crowns, LC specimen was superior for absolute marginal discrepancy and marginal gap. The surface of metal crowns by selective laser melting were the roughest.