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주조에 의한 Core와 CAD-CAM에 의한 Core의 적합도 비교평가
김기백 ( Man So Han ),한만소 ( Ki Baek Kim ) 한국치위생과학회 2012 치위생과학회지 Vol.12 No.4
Dental CAD (computer-aided design)/CAM (computer-aided manufacturing) systems facilitate the use of zirconia core for all-ceramic crown. The purpose of this study was to evaluate the marginal and internal fit of zirconia core fabricated using a dental CAD/CAM system and to compare the fit of metal cores by a conventional method. Ten identical cases of single coping study models (abutment of teeth 11) were manufactured and scanned. Ten zirconia cores were fabricated using dental CAD/CAM system. An experienced dental technician fabricated 10 samples of metal cores for the control group using the lost wax technique. Marginal and internal fit was measured by the silicone replica technique. Fit was measured with magnification of 160 using a digital Microscope. Margin, rounded chamfer, axial wall and incisal fits were measured for comparison. T-test of independent sample for statistical analysis was executed with SPSS 12.0 for Windows (SPSS Inc., Chicago, IL, USA) (a=0.05). The mean (SD) for marginal, rounded chamfer, axial wall and incisal were: 97.0 (25.3) mm, 104.0 (22.0) mm, 59.6 (21.4) mm and 124.8 (33.3) mm for the zirconia core group, and 78.2 (18.4) mm, 83.8 (15.1) mm, 42.7 (9.6) mm and 83.4 (14.4) mm for the metal core group. T-test showed significant differences between groups for margin (p<.001), rounded chamfer (p<.001), axial wall (p<.001) and incisal (p<.001). But zirconia core group observed that the marginal and internal fit values in the present study were within clinically acceptable range.
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