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KMID : 1035320200470010001
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Korean Society for Dental Materials
2020 Volume.47 No. 1 p.1 ~ p.10
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Evaluation of marginal and internal gap of metal substructures fabricated by the state-of-the-art manufacturing technologies
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Kim Jae-Hong
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Abstract
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This study was aimed to evaluate the marginal and internal gap of metal substructure with Co-Cr alloys for metal-ceramiccrown fabricated by the newly developed CAD/CAM manufacturing technologies. Thirty metal substructures were fabricatedand divided into one control group (conventional lost wax technique, CT) and two experimental groups according to the state-of-the-artmanufacturing technologies (substrative technique, ST and addtive technique, AT). The marginal and internal gaps of the substructurewere evaluated with a silicone replica technique. Each silicone replica was measured with digital microscope at a magnificationof 160 X. The one-way ANOVA with post-hoc analysis of Tukey’s HSD test were performed (corrected α error level=0.05).
The mean marginal and internal gap were differed significantly with manufacturing technologies. The results indicate that thegap in the ST and AT groups is significantly larger than that in the CT group (P<0.05). Although the gap was found to bevaried with manufacturing technologies, the marginal and internal gaps of the metal substructure fabricated by ST and AT fellwithin the range of clinical acceptance (<120 μm).
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KEYWORD
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Co-Cr alloys, Metal-ceramic, Lost wax technique, The state-of-the-art manufacturing technologies, Marginal and internal gap
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