출력 지지대 두께가 선택적 레이저 용융법으로 제작된 금속 하부구조물 적합도에 미치는 영향
Effect of support thickness on the adaptation of Co-Cr alloy copings fabricated using selective laser melting
김재홍, 김세연,
소속 상세정보
김재홍 ( Kim Jae-Hong ) -
김세연 ( Kim Se-Yeon ) -
Abstract
Purpose: This in vitro study aimed to evaluate the clinical acceptability of precision of fit of the support thickness of Co-Cr alloy copings fabricated using selective laser melting (SLM).
Methods: Thirty dental stone models of maxillary left molar abutments were manufactured, images were taken using a scanner, and a computer-aided design program was used to design the form of a conventional metal ceramic crown coping. Overall, 30 single copings were made from Co-Cr alloy using SLM and divided into three support radius groups (0.1, 0.25, and 0.35 mm) of 10 for each. Digitized data were superimposed with three-dimensional inspection software to quantitatively obtain the machinability of a ceramic crown coping, and visual differences were confirmed using a color map. The root mean square values of the ceramic crown coping group were statistically analyzed using one-way analysis of variance (α=0.05).
Results: The precision of fit was superior with 0.25 mm compared with 0.1 mm and 0.35 mm, and the results exhibited significant differences (p<0.05). All specimens showed that various support thicknesses did not exceed the clinically permitted value of 120 μm, which mean that more than 0.1 mm and 0.35 mm of support radius for SLM was adequate.
Conclusion: The support thickness of Co-Cr alloy restoration fabricated using SLM is shown to affect the adaptation.
키워드
Co-cr alloy; Precision of fit; Selective laser melting; Support radius
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