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KMID : 1004520130290040366
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Journal of Dental Rehabilitation and Applied Science
2013 Volume.29 No. 4 p.366 ~ p.376
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Marginal and Internal Fit of Copings Made by CAD/CAM using Different Scanning Methods
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Cho Young-beom
Chung Chae-Heon
Kim Hee-Jung
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Abstract
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The purpose of this study is to evaluate the marginal and internal fit of coping made by CAD/CAM using different scanning methods. Zirconia coping was made by each CAD/CAM system followed by intra-oral scanning, model optical scanning and model contact scanning. It was embedded into Epoxy Resin and was cut by buccal to lingual. AMD (Absolute marginal discrepancy), MG (Marginal gap), GA (Gap of axial), GL (Gap of line angle) and GO (Gap of occlusal) of each sample were measured. The result is as followed; 1. The mean value of AMD in Group 1, Group 2, Group 3 are 141.21±42.94 ㎛m, 140.63±31.64 ㎛, 109.37±28.42 ㎛. The averages of MG in Group 1, Group 2, Group 3 are 82.52±43.99 ㎛, 90.28±27.93 ㎛, 66.55±28.77 ㎛. Statistically there is no difference in AMD and MG among the three Groups (Anova, >0.05).
2. GA of Group 2 revealed statistically difference compared with Group 1 and Group 3 (Anova, P<0.05). 3. GL and GO of Group 1 showed statistically significant differences compared with Group 2 and Group 3 (Mann-whitney test (P<0.05). Zirconia copings made by 3 ways of scanning methods have no difference with conventional ceramics in AMD and MG which are known as the most important factors.
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KEYWORD
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Sacnning methods, Zirconia coping, AMD, MG, Fit
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