Journal of Technologic Dentistry (대한치과기공학회지)

Korean Academy of Dental Technology (대한치과기공학회)
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Effect of support thickness on the adaptation of Co-Cr alloy copings fabricated using selective laser melting

출력 지지대 두께가 선택적 레이저 용융법으로 제작된 금속 하부구 조물 적합도에 미치는 영향

  • Jae-Hong Kim (Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan) ;
  • Se-Yeon Kim (Department of Dental Laboratory Science, College of Health Science, Catholic University of Pusan)
  • 김재홍 (부산가톨릭대학교 보건과학대학 치기공학과) ;
  • 김세연 (부산가톨릭대학교 보건과학대학 치기공학과)
  • Received : 2023.08.14
  • Accepted : 2023.09.21
  • Published : 2023.09.30
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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 ㎛, 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.

Keywords

Acknowledgement

This paper was supported by 2021 RESEARCH FUND offered from Catholic University of Pusan.

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