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http://dx.doi.org/10.5762/KAIS.2015.16.10.6611

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

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)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.16, no.10, 2015 , pp. 6611-6617 More about this Journal
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 (< $38{\mu}m$).
Keywords
marginal gap; internal gap; CAD/CAM;
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