시멘트의 종류 및 임플란트 지대주 높이가 지르코니아 수복물의 제거력에 미치는 영향
Influence of varying cement types and abutment heights on pull-off force of zirconia restorations
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목적: 본 연구의 목적은 세 가지 높이를 가진 티타늄 베이스 임플란트 지대주에서 세 종류의 시멘트가 지르코니아 수복물에서 가지는 제거력을 비교하는 것이다. 연구 재료 및 방법:. 90개의 직경 4.0 mm 임플란트 아날로그가 레진 블록에 식립되었다. 이후 3 mm, 5 mm, 7 mm의 높이를 가지도록 임플란트 지대주를 30개씩 제작하였고, 각 지대주를 스캔하여 지르코니아 수복물 시편을 제작하였다. 임시 시멘트(TB), 반영구 시멘트(CI), 영구 시멘트(FC)를 각자 제조사의 지시에 따라 지대주에 접착하였다. 제작된 90개의 시편은 만능시험기에서 제거력을 시험하였으며, 모든 제거력은 부하량이 하락하기 직전 가장 높은 값에서 측정되었다. 통계 분석은 지대주의 높이, 시멘트의 종류에 대해 각각 Kruskal-Wallis test (P = 0.05) 후 Mann-Whitney U test (P = 0.0167)로 사후 검정 시행하였다. 결과: 임플란트 지대주의 높이에 상관없이 TB에 비해 FC의 제거력이 높았다. CI와 FC간에는 3 mm와 7 mm에서는 유의미한 차이가 있었으나 5 mm에서는 유의미한 차이가 없었다. TB와 CI간에는 5 mm에서만 유의미한 차이가 있었다. 결론: 시멘트의 종류는 지르코니아 수복물의 제거력에 유의미한 영향을 끼쳤으나, 임플란트 지대주의 높이는 유의미한 영향을 주지 않았다.
Abstract
Purpose: The purpose of this study is to evaluate Ti-base abutment’s three different heights and three different cement types on the pull-off force of zirconia-based restorations. Materials and Methods: A total of 90 fixture lab analogs were embedded in auto polymerizing resin bloack. 90 Ti-base abutments heights of 3 mm, 5 mm, 7 mm were scanned and zirconia restoration were prepared from scanned files. Zirconia restoration were cemented with three different types of cements (temporary, semi-permanent, permanent) following manufacturer’s instructions. All 90 specimens were placed and tested in a universal testing machine for pull-out testing. Retention was measured by recording the force at load drop. Statistical analysis was performed using Kruskal-Wallis test for detecting whether there are any statistical significance along cement types or abutment heights. After that, Mann-Whitney test was used for figuring out differences regarding abutment height and the comparison between 3 cements. Results: Temp bond showed significantly lower pull-off force compared to Fujicem regardless of any abutment height. However, there were significant differences between Cem-implant and Fujicem in abutment height of 3 mm and 7 mm, but there was no significant difference in 5 mm. Temp bond and Cem-implant had significant differences only in abutment height of 5 mm. Conclusion: Although Ti-base abutment height did not influenced zirconia restorations’ retentiveness, cement types showed significant differences.
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