Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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The influence of combining composite resins with different elastic modulus on the stress distribution of class V restoration: A three-dimensional finite element study

탄성계수가 다른 복합레진의 혼합수복이 5급 수복물의 응력분포에 미치는 영향에 관한 3차원 유한요소법적 연구

  • Park, Jeong-Kil (Department of Conservative Dentistry, School of Dentistry, Pusan National University) ;
  • Hur, Bock (Department of Conservative Dentistry, School of Dentistry, Pusan National University) ;
  • Kim, Sung-Kyo (Department of Conservative Dentistry, School of Dentistry, Kyungpook National University)
  • 박정길 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 허복 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 김성교 (경북대학교 치의학전문대학원 치과보존학교실)
  • Published : 2008.05.30
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Abstract

This study was to investigate the influence of combining composite resins with different elastic modulus, and occlusal loading condition on the stress distribution of restored notch-shaped non-carious cervical lesion using 3D finite element (FE) analysis. The extracted maxillary second premolar was scanned serially with Micro-CT. The 3D images were processed by 3D-DOCTOR. ANSYS was used to mesh and analyze 3D FE model. A notch-shaped cavity was modeled and filled with hybrid, flowable resin or a combination of both. After restoration, a static load of 500N was applied in a point-load condition at buccal cusp and palatal cusp. The stress data were analyzed using analysis of principal stress. Results showed that combining method such that apex was restored by material with high elastic modulus and the occlusal and cervical cavosurface margin by small amount of material with low elastic modulus was the most profitable method in the view of tensile stress that was considered as the dominant factor jeopardizing the restoration durability and promoting the lesion progression.

본 연구는 3차원 유한요소분석법적 연구를 통해 쐐기형 비우식성 치경부병소의 복합레진수복에서 다른 탄성계수를 가진 복합레진의 혼합수복이 5급 수복물의 응력분포에 미치는 영향에 대해 알아보고자 하였다. 발거된 상악 제2소구치를 Micro-CT로 스캔한 후 3D-DOCTOR로 3차원유한요소 모형을 제작하였다. 제작된 소구치 모형에 쐐기형 와동과 변형시킨 와동을 형성하고 각 와동을 탄성계수가 서로 다른 혼합형 복합레진 또는 흐름성 복합레진으로 수복하였다. 수복 전, 후 협측교두와 설측교두에 500N의 하중을 가한 후 응력분포를 ANSYS 프로그램을 이용하여 주 응력 분석법으로 평가한 결과 치아 및 수복물에 위해한 인장응력을 고려할 때 탄성계수가 높은 재료로 와동저선각을 수복하고 교합측변연과 치경부측 변연은 탄성계수가 낮은 재료로 수복하는 혼합수복법이 쐐기형 비치경부병소의 수복에 있어 가장 유리하였다.

Keywords

References

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