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Comparison of the fit of the coping pattern constructed by manual and CAD/CAM, depending on the margin of the abutment tooth

지대치 변연 형태에 따른 수작업과 CAD/CAM으로 제작한 coping 패턴의 적합도 비교

  • Han, Min-soo (Dept. of Dental Laboratory technology, Hyejeon College) ;
  • Kwon, Eun-Ja (Dept. of Dental Laboratory technology, Hyejeon College) ;
  • Chio, Esther (Dept. of Dental Laboratory technology, Hyejeon College) ;
  • Kim, Si-chul (Dept. of Dental Laboratory technology, Hyejeon College)
  • Received : 2015.07.01
  • Accepted : 2015.10.08
  • Published : 2015.10.31

Abstract

The purpose of this study is to compare the marginal and internal fit of metal and zirconia coping which is fabricated by manual and CAD/CAM(Computer Aided Design/Computer Aided Manufacturing). The model is prepared with Urethane material and two abutment teeth are fabricated with a knife and chamfer margin. Silicon replica technique is used to measure the marginal fit of manually fabricated and the CAD/CAM coping. Internal fitting level is measured with a microscope and the image is captured with a CCD camera. The distance between abutment teeth and coping is measured with a callibrated image analyzer software; marginal opening (MO), marginal gap (MG), internal gap (IG) at maximum curvature area, axial gap (AG), and occlusal gap (OG). Two-way ANOVA test is applied to compare fabrication technique and to analysis of abutment pattern. In addition, one-way ANOVA and Scheffe's test is used to analyze each parameter of the test. The result shows that the fit is < $120{\mu}m$ except OG of CAD/CAM and MO of knife margin. The CAD/CAM fabricated coping showed higher fit level at chamfer margin. However, knife margin showed better fitness compared to chamfer margin at MG. AG showed the minimum dimension with a constant result (< $38{\mu}m$).

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