설측 슬롯을 부여한 임플란트 고정성 보철물에서 내면 간격이 유지력에 미치는 영향
Effect of internal gap on retentivity in implant fixed prosthesis with lingual slot
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목적: 최근 임플란트 고정성 보철물 제작 시 나사 유지형 보철물의 교합적, 심미적 단점을 해결하고, 시멘트 유지형 보철물에서 착탈 용이성을 확보하기 위하여 보철물 설측에 슬롯을 형성하는 방법이 소개되었다. 이 연구의 목적은 설측 슬롯을 부여한 시멘트 유지형 임플란트 보철물 제작 시에 내면 간격이 보철의 제거에 어떤 영향을 미치는지 알아보는 것이다. 재료 및 방법: 티타늄 지대주와 상부에 합착할 지르코니아 보철물 내면 간격을 30, 35, 50 μm의 3종류로 설정하여 종류별로 3개씩 총 15개를 제작하였다. 지르코니아 보철물은 티타늄 지대주의 선반 부위와 만나는 위치에서 1 mm의 공간이 생기도록 하여 탈착을 위한 슬롯(retrievable cement-type slot, RCS)을 형성하였다. 지대주와 지르코니아 보철물의 합착에는 자가 중합 레진 시멘트를 이용하였고, 합착 된 시편을 맞춤 제작된 장비를 이용하여 최대 제거 응력 값을 Ncm단위로 측정하였다. 통계적 분석으로 세 그룹을 비교하기 위해 Kruskal-Wallis 검정을 시행하였고 (α = .05), 사후검정으로 수정된 Mann-Whitney U-test와 Bonferroni correction 방법을 이용하여 차이를 보았다 (α = .017). 결과: 내면 간격이 30 μm 군과 35 μm 군간의 비교에 있어서 제거 응력에 통계학적으로 유의한 차이가 없었고 (P = .032), 30 μm군과 50 μm군, 35 μm군과 50 μm군간을 비교 할 때 유의한 차이가 나타났다 (P < .017). 결론: 그러므로 내면 간격은 지르코니아 보철물과 티타늄 지대주 사이의 유지력에 영향을 미쳤다.
Abstract
Purpose: Recently, a method of forming a slot in the prosthesis lingual has been introduced to solve the occlusal and aesthetic disadvantages of screw-retained prosthesis in the manufacture of implant-fixed prosthesis and to ensure retrievability in cement retained prostheses. The purpose of this study is to investigate the effect of the internal gap on the removal of the prosthesis in the preparation of cement-retained implant prostheses with lingual slots. Materials and methods: Titanium abutment and internal gap of the zirconia prosthesis to be attached to the upper part were set to 30, 35, and 50 μm, respectively. Three for each type total 15 were produced for each type. The zirconia prosthesis formed a retrievable cement-type slot with a space of 1 mm at the location where the titanium abutment meets the shelf area. Autocatalytic resin cement was used for bonding of abutment and zirconia prosthesis, and the maximum removal stress value was measured in units of Ncm by using the customized equipment of the cemented specimen. The Kruskal-Wallis test was used to compare the three groups by statistical analysis (α = .05), modified by post hoc test the Mann-Whitney U-test and the Bonferroni correction method were used to compare the two methods (α = .017). Results: There was no statistically significant difference in removal stress between the 30 μm group and the 35 μm group in the internal gap (P = .032), and there was a significant difference between the 30 μm group and the 50 μm group, between the 35 μm group and the 50 μm group (P < .017). Conclusion: Thus, the internal gap of computer-aided design affected the retention between the zirconia prosthesis and the titanium abutment.
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