금속 밀링과 직접 금속 레이저 소결 방식으로 제작한 3본 코발트-크롬 구조물의 변연 및 내부 적합도 비교 평가
Comparative evaluation of marginal and internal fit of three-unit Co-Cr frameworks fabricated by metal milling and direct metal laser sintering methods
안재석, 이정환,
소속 상세정보
안재석 ( Ahn Jae-Seok ) - Gwangju Health University Department of Dental Laboratory Technology
이정환 ( Lee Jung-Hwan ) - Gwangju Health University Department of Dental Laboratory Technology
Abstract
Purpose: This in vitro study was conducted to evaluate the marginal and internal fit of three-unit Co-Cr frameworks fabricated by computer-aided metal milling and direct metal laser sintering(DMLS) systems in comparison to conventional casting method.
Methods: Three-unit Co-Cr frameworks were fabricated by conventional wax up with casting(CWC), computer-aided metal milling(MM) and direct metal laser sintering(DMLS)(n=10 each). The marginal and internal fit of specimens were examined using a light-body silicone impression material. The thickness of light-body silicone was measured at eight reference points each, divided in the mesio distal and bucco lingual directions. All measurements were conducted by a stereomicroscope. Digital photos were taken at 150× magnification and then analyzed using a measurement software. The Kruskal-Wallis test and Bonferroni correction were used for analyzing the results.
Results: The mean(SD) is ㎛ for fabrication methods, the mean marginal fit were recorded respectively, DMLS 39(27), followed by CWC 63(38), MM 220(128). and the mean internal fit CWC 95(47), DMLS 116(49), MM 210(152). In addition, the largest gap was found in the occlusal surface area among the internal measurement areas of all groups.
Conclusion: As a result, the direct metal laser sintering method showed better marginal and internal fit than the metal milling method. The marginal and internal fit were statistically different according to the three fabrication methods(p<0.001). Except the MM group, the marginal fit of the CWC and DMLS groups was below the clinical standard of 120 ㎛. Based on the results of this study, it can be applied to clinical use in the future.
키워드
Computer-aided milling; Direct metal laser sintering; Marginal and internal fit; Marginal gap
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