3종의CAD/CAM 시스템에서 지르코니아 코어의 파절 강도에 관한 비교 연구
Comparative study in fracture strength of zirconia cores fabricated with three different CAD/CAM systems
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초록
최근 CAD/CAM 시스템을 이용하여 제작된 지르코니아 코어의 사용이 증가하고 있다. 하지만 국내 기술력을 이용한 제품에 대한 연구는 아직 미흡한 단계이다. 본 연구의 목적은 3종의 CAD/CAM 시스템에서 단일 전부 도재관을 위한 지르코니아 코어의 파절 강도를 비교하는 것이다. 본 연구를 위해 상악 중절치 부위의 전부도재관을 위한 30개의 지르코니아 코어를 제작하였다. 각 군은 다음과 같다. 1. Adensဂ CAD/CAM 시스템 군, 2. Cerasysဂ CAD/CAM 시스템 군, 3. Lavaဂ CAD/CAM 시스템 군. 모든 시편은 두께 0.5mm, relief 40㎛로 일관성 있게 제작하였다. 시편은 Z250/SN5S을 이용하여 파절 강도를 측정하였다. 각 군의 평균과 표준편차를 구하고, 각 군간의 유의성을 알아보기 위해 Kruskal waillis test와 Wilcoxon Rank Sum test를 시행하였다. 본 연구 결과, 각 군의 파절 강도는 Adensဂ 시스템은 615.89±156.1N, Cerasysဂ 시스템은 863.98±151.5N, 3M Lavaဂ 시스템은 1143.1±286.6N 이었다. 각 군의 파절 강도는 3M Lavaဂ 시스템, Cerasysဂ 시스템, Adensဂ 시스템 순으로 통계학적으로 유의한 수준의 차이를 보였으나, 세 그룹 모두 임상적으로 사용 가능한 결과를 나타냈다. 실제 임상에서 장기간의 사용에 대한 연구가 필요할 것이다.
Abstract
The purpose of this study is to compare three different CAD/CAM systems through the fracture strength of zirconia core and to evaluate the clinical availability of each system. Material and methods: The following three groups of 30 maxillary mesial incisor core for all-ceramics(each group 10) were fabricated as follows: group 1. Adensဂ CAD/CAM system, group 2. Cerasysဂ CAD/CAM system, group 3. 3M LAVAဂ CAD/CAM system. All specimens were manufactured consistently thickness 0.5mm and relief 40μm. Specimens were subjected to compressive loading on the lingual area by Z250/SN5Sဂ. Each group’s mean and standard deviation were calculated and Kruskal Waillis test, Wilcoxon Rank Sum test were utilized to find out the relationship among the groups. Results: The results were as follows: 1. The mean fracture strength of Adensဂ system was 615.89±156.1N, the Cerasysဂ system was 863.98±151.5N, and the 3M LAVAဂ system was 1143.1±286.6N. 2. The fracture strength of the systems showed the significant statistical differences in order of 3M LAVAဂ system, Cerasysဂ system, Adensဂ system. Conclusion: In this study, in spite of the differences among the groups, every group showed clinically useful results. It is necessary to study further clinical experiments on a long term basis.
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