MAD/MAM을 이용한 치과용 지르코니아 코어의 변연 적합도
Marginal fidelity of zirconia core using MAD/MAM system
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초록
연구 목적: 본 연구에서는 MAD/MAM 시스템으로 제작된 지르코니아 코어를 통상적인 방법으로 제작된 금속-도재관 코어와CAD/CAM 시스템으로 제작된 코어와의 변연부 적합도를 비교?분석해 보고자 한다. 연구 재료 및 방법:레진치를 전부 도재관 제작을 위한 형태로 삭제하고, 이를 복제하여 석고 모형을 제작하였다. 석고 모형에 대해 금속-도재관, CAD/CAM (Cercon(R)), 3종의 MAD/MAM 시스템 (Ceramill(R), RainbowTM, Zirkonzhan(R))으로 각각 10개의 코어를 제작하였다. 제작된 코어를 다이에 합착하여 광학 현미경 상에서 50배율로 변연 간격을 관찰, 계측하였다. 측정된 결과는 one-way ANOVA test로 분석하고, Tukey’s HSD test로 사후검정 하였다. 결과: 각 시스템에서 변연 간격의 평균과 표준 편차는 금속-도재관 코어 51.97 ± 23.38 μm, Cercon(R) 62.16 ± 25.88 μm, Ceramill(R) 67.64 ± 40.38 μm, RainbowTM 125.07 ± 42.19 μm, Zirkonzhan(R) 105.02 ± 44.61 μm로 측정되었다. 결론: 금속-도재관 코어나 CAD/CAM에 비해 MAD/MAM 방식으로 제작된 코어의 변연 간격이 큰 것으로 나타났다 (P < .05). MAD/MAM 시스템 내에서도 Ceramill(R), Zirkonzhan(R), RainbowTM 순으로 변연 간격이 작은 것으로 측정되었으며, 이중 Ceramill(R)은 CAD/CAM 시스템인 Cercon(R)과 변연 간격에 유의차가 없었다.
Abstract
Purpose: The purpose of this study was to evaluate the fit of zirconia core using MAD/MAM system comparing to that of conventional metal-ceramic and CAD/CAM system. Materials and methods: Duplicating the prepared resin tooth, 50 improved stone dies were fabricated. These dies are classified as a group of 5 to create the core. The groups were composed of metal-ceramic, Cercon(R)., Ceramill(R)., RainbowTM, and Zirkonzhan(R). Each core was cemented to stone die, and then, absolute marginal discrepancy was measured with microscope at a magnification of ×50. Statistical analysis was done with one-way ANOVA test and Tukey’s HSD test. Results: The mean absolute marginal discrepancy for metal-ceramic was 51.97 ± 23.38 μm, for Cercon(R) was 62.16 ± 25.88 μm, for Ceramill(R) was 67.64 ± 40.38 μm, for RainbowTM was 125.07 ± 42.19 μm, and for Zirkonzhan(R) was 105 ± 44.61 μm. Conclusion: 1. Fit of margin was identified as in the order of metal-ceramic, Cercon(R), Ceramill(R), Zirkonzhan(R), and RainbowTM. 2. Absolute marginal discrepancy of the zirconia core that designed by MAD/MAM system had significant differences in order of Ceramill(R) 7, Zirkonzhan(R), and RainbowTM. 3. The mean absolute marginal discrepancy between Cercon(R) and Ceramill(R) did not show significant differences.
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