단일 절삭가공용 왁스 디스크 내에서 순차적 절삭가공 순서에 따른 크라운의 내면 및 변연 적합도 비교
Comparison of internal and marginal fit of crown according to milling order in a single machinable wax disc
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초록
목적: 본 연구의 목적은 절삭가공이 순차적으로 진행됨에 따른 왁스 디스크의 구조적 안정성의 변화가 보철물의 적합도에 미치는 영향을 평가하는 것이다. 재료 및 방법: 삭제된 상악제1대구치 인공치아를 이용하여 Ni-Cr 합금 표준모형을 제작하였고, 이를 스캔하여 크라운을 디자인한 뒤 왁스 디스크를 절삭가공하고 매몰 및 Ni-Cr 합금으로 주조하여 보철물을 제작하였다. 단일 왁스 디스크 내에서 중앙에 일렬로 위치한 납형들은 가장 처음 절삭가공 되는 WM1군부터 마지막에 절삭가공 되는 WM5군으로 총 5개의 군을 설정하였고 각 군의 수는 10개로 하였다. 적합도는 실리콘 레플리카 방법을 이용하여 변연 간극, 축면 간극, 선각간극, 교합면 간극을 측정하였다. 측정값은 일원배치분산분석(one-way ANOVA)을 사용하여 유의 수준은 95%로 그룹 간의 차이를 평가한 뒤, 사후 분석을 위해 Tukey HSD test를 시행하였다(α = .05). 결과: 각 군의 변연 간극은 WM1군(40.41 ± 2.15 μm), WM2군(40.44 ± 2.23 μm), WM3군(39.96 ± 2.25 μm), WM4군(39.96 ± 2.48 μm), WM5군(40.57 ± 2.53 μm)으로 각 군간에 유의한 차이를 보이지 않았다. 축면 간극, 선각 간극, 교합면 간극에서도 각 군간에 유의한 차이를 보이지 않았다. 결론: 단일 절삭가공용 왁스 디스크 내에서 순차적 절삭가공 시 크라운의 내면 및 변연 적합도는 절삭 순서에 영향 받지 않는것으로 보인다.
Abstract
Purpose. The purpose of present study was to evaluate the effect of changing structural stability of wax disc on the fit of prosthesis when the milling proceeded in order. Materials and methods. Prepared maxillary left first molar was used to fabricate a Ni-Cr alloy reference model. This was scanned to design crown and then wax pattern was milled, invested and cast to fabricate prosthesis. The wax patterns located in a row centrally within a single wax disc were set into a total of five groups ranging from WM1 group that was first milled to WM5 group that was last milled and the number of each group was set as 10. Silicone replica technique was used to measure the marginal gap, axial internal gap, line angle internal gap, occlusal internal gap. Data was evaluated with one-way ANOVA with significance level set at α = .05 and then Tukey HSD test was conducted for post analysis. Results. Marginal gap measured in each group, it was 40.41 ± 2.15 μm in WM1 group, 40.44 ± 2.23 μm in WM2 group, 39.96 ± 2.25 μm in WM3 group, 39.96 ± 2.48 μm in WM4 group, and 40.57 ± 2.53 μm in WM5 group. No significant difference was found between groups. The significant difference between the groups was also not found in the axial internal gap, line angle internal gap, and occlusal internal gap. Conclusion. Internal and marginal fit of single crown to the sequential order of milling processing in the single machinable wax disc did not seem to be affected by the sequence.
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