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KMID : 1023820150070020122
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The Journal of Advanced Prosthodontics
2015 Volume.7 No. 2 p.122 ~ p.128
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Accuracy evaluation of metal copings fabricated by computer-aided milling and direct metal laser sintering systems
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Park Jong-Kyoung
Lee Wan-Sun
Kim Hae-Young
Kim Woong-Chul
Kim Ji-Hwan
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Abstract
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PURPOSE : To assess the marginal and internal gaps of the copings fabricated by computer-aided milling and direct metal laser sintering (DMLS) systems in comparison to casting method.
MATERIALS AND METHODS : Ten metal copings were fabricated by casting, computer-aided milling, and DMLS. Seven mesiodistal and labiolingual positions were then measured, and each of these were divided into the categories; marginal gap (MG), cervical gap (CG), axial wall at internal gap (AG), and incisal edge at internal gap (IG). Evaluation was performed by a silicone replica technique. A digital microscope was used for measurement of silicone layer. Statistical analyses included one-way and repeated measure ANOVA to test the difference between the fabrication methods and categories of measured points (α=.05), respectively.
RESULTS : The mean gap differed significantly with fabrication methods (P<.001). Casting produced the narrowest gap in each of the four measured positions, whereas CG, AG, and IG proved narrower in computer-aided milling than in DMLS. Thus, with the exception of MG, all positions exhibited a significant difference between computer-aided milling and DMLS (P<.05).
CONCLUSION : Although the gap was found to vary with fabrication methods, the marginal and internal gaps of the copings fabricated by computer-aided milling and DMLS fell within the range of clinical acceptance (<120 μm). However, the statistically significant difference to conventional casting indicates that the gaps in computer-aided milling and DMLS fabricated restorations still need to be further reduced.
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KEYWORD
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CAD/CAM system, Cobalt-chromium alloy, Computer-aided milling, Direct metal laser sintering, Marginal and internal fit
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