시멘트 공간이 캐드캠 시스템으로 제작한 지르코니아 수복물의 변연과 내부 적합도에 미치는 효과
Effect of cement space on the marginal and internal fit of zirconia restorations fabricated by CAD/CAM system
이정환, 안재석,
소속 상세정보
이정환 ( Lee Jung-Hwan ) - 광주보건대학교 치기공과
안재석 ( Ahn Jae-Seok ) - 광주보건대학교 치기공과
Abstract
Purpose: The aim of this study was to evaluate the marginal and internal gap of zirconia copings fabricated by CAD/CAM system and to research the effect of cement space on the fit of zirconia prosthesis.
Methods: Zirconia copings were designed using 3shape software and then milled from presintered zirconia blocks by Kavo dental milling machine. The cement space was set at 0 ㎛ around the margins for all groups, and additional cement space appling 1 mm above the finish lines of tooth. The samples were classified into 4 groups according to the cement space setting(Cs-0, Cs-40, Cs-80, Cs-120). Replica technique used to investigate marginal and internal gap. The silicone film thickness was recorded using a optical microscope with image software analysis system at 75×magnification. The assessment performed on the six points in bucco-lingual and mesio-distal sections(4 groups, 10 copings per group, 12 measuring points per coping). The data were statistically analyzed with one-way ANOVA followed by pair-wise Tukey’s post hoc tests(α<0.05).
Results: Better marginal and internal fit values were exhibited by 80 ㎛ cement space. The results showed that different cement space values had statistically significant effect on the marginal and internal gap of zirconia copings(p<0.001). The gap of margin and axial wall area was smaller than that the gap of occlusal area in all groups(p<0.001).
Conclusion : Effect of different cement spaces on the marginal and internal gap of zirconia copings.
키워드
CAD/CAM; Cement space; Marginal and internal fit; Zirconia coping
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