단일구조 지르코니아 크라운의 소결 후 추가 소성 과정이 변연 및 내면 적합도에 미치는 영향
Effect of additional firing process after sintering of monolithic zirconia crown on marginal and internal fitness
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목적: 본 연구는 단일구조 지르코니아 크라운의 소결 후 소성 과정이 변연 및 내면 적합도에 미치는 영향에 대하여 3차원으로 평가해 보고자 하였다. 재료 및 방법: 타이타늄 지대치 모형을 제작하여 10개의 단일구조 지르코니아 크라운을 제작하였다. 제작된 단일구조 지르코니아 크라운을 소결 한상태를 대조군으로, 소결 후 광택을 위해 추가적인 소성단계를 거친 후를 실험군으로 설정하였다. 각 군에서 triple-scan protocol을 이용하여 협설과 근원심으로 단면을 형성하고 변연 및 내면 적합도를 계측하여 통계 분석하였으며, 삼차원 표면 비교를 시행하였다 (α = .05). 결과: 변연과 내면 적합도를 분석한 결과 근심 축벽에서 대조군(32.0 ± 24.3 μm)과 실험군 간(17.0 ± 10.8 μm)의 통계적 유의한 차이가 있었고 (P <.020), 원심 축벽에서 대조군(60.2 ± 24.3 μm)과 실험군(71.8 ± 21.5 μm)간의 통계적으로 유의한 차이가 있었다 (P < .01). 나머지 측점지점에서는 통계적으로 유의한 차이가 없었다. 결론: 단일구조 지르코니아 크라운에서의 소결 후 추가적인 소성은 내면의 변형에 큰 영향을 미치지 않았고 임상적으로 허용 가능한 범위에 있었다.
Abstract
Purpose: To evaluate an effect of additional firing process after sintering of monolithic zirconia crown on marginal and internal fit through three-dimensional analysis. Materials and methods: Ten monolithic zirconia crowns were fabricated using titanium abutment model. Monolithic zirconia crowns were designed, milled, and sintered as a control group, and additional firing with coloring was performed as a test group. Three dimensional analysis were performed by using triple-scan protocol, and cross-section analysis on mesio-distal and disto-lingual section was evaluated to measure marginal and internal fitness. Then, three-dimensional surface difference on between two groups was evaluated (α=.05). Results: There was statistically significant difference between the control group (32.0 ± 24.3 μm) and the test group (17.0 ± 10.8 μm) in the mesial axial wall (P < .02) and the control group (60.2 ± 24.3 μm) and the test group (71.8 ± 21.5 μm) in the distal axial wall (P < .01). There was no statistically significant difference at the remaining point. Conclusion: There was no statistical significance on the deviation of inner surface of crown according to firing number, and the results of both group were considered clinically acceptable.
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