주조에 의한 Core와 CAD-CAM에 의한 Core의 적합도 비교평가
Comparison of the Marginal and Internal Fit on the Cast and CAD-CAM Cores
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참고문헌
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초록
제한된 조건 하에서 수행된 본 연구에서 다음과 같은 결론을 얻었다. 1. 치과용 캐드캠을 이용하여 제작된 지르코니아 코어의변연 및 내면 적합도보다 전통적인 방식을 이용하여 제작한금속 코어가 모든 부위에서 우수하였다(p＜.001). 2. 두 그룹 모두에서 적합도가 가장 미흡한 부분은 절단부였고, 축벽부가 가장 우수한 것으로 확인되었다. 본 연구 결과를 볼 때 아직까지는 치과용 캐드캠을 이용하여 보철물을 제작하는 것이 기존의 기공 방식을 이용하여제작된 보철물의 적합도만큼 만족스럽지는 못하였으나 임상적 허용 범위 안에 존재하였다는 점에서 치과용 캐드캠은임상적으로 사용이 가능한 것으로 판단된다. 앞으로 기계가개선되고 가공 방식이 지금보다 발전한다면 기존의 기공 방식을 이용하여 제작되는 보철물의 완성도를 능가할 것으로생각된다.
Abstract
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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