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KMID : 1035320160430020177
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Korean Society for Dental Materials
2016 Volume.43 No. 2 p.177 ~ p.184
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Marginal Accuracy of Three-Unit Bridge Fabricated Using Dental Co-Cr CAD/CAM Soft Metal Block
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Kim Si-Chul
Lee Hae-Hyoung
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Abstract
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Dental CAD/CAM technology have been introduced to the field of dental laboratory processing for fabrication of metallic prosthesis in order to substitute traditional lost-wax technique. The purpose of this study was to investigate the internal adaptation accuracy of 3-unit fixed partial denture (bridge) made of Co-Cr soft metal block with dental CAD/CAM systems. A three-unit bridge model was prepared with two types of margin (knife and chamfer). The master models were used to fabricate three-unit bridge with soft metal block by CAD/CAM system. Internal fit was measured by a replica technique at the areas of marginal opening (MO), marginal gap (MG) of maximum curvature area, axial gap (AG), and occlusal gap (OG). For MO gap, bridge with chamfer margin recorded a significantly higher adaptation accuracy than bridge with knife margin, however, MG gap with knife was significantly smaller than MG gap with chamfer (P＜0.05). The mean gap dimensions of all area measured were under 120 ㎛. Overall results indicate that the CAD/CAM fabricating method for metal restorations can substitute the conventional lost-wax technique in terms of marginal accuracy.
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KEYWORD
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Dental CAD-CAM, Bridge, Co-Cr alloy, Soft metal block, Accuracy of fit
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