Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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The influence of occlusal loads on stress distribution of cervical composite resin restorations: A three-dimensional finite element study

교합력이 치경부 복합레진 수복물의 응력분포에 미치는 영향에 관한 3차원 유한요소법적 연구

  • Park, Chan-Seok (Department of Conservative Dentistry, School of Dentistry, Pusan National University) ;
  • Hur, Bock (Department of Conservative Dentistry, School of Dentistry, Pusan National University) ;
  • Kim, Hyeon-Cheol (Department of Conservative Dentistry, School of Dentistry, Pusan National University) ;
  • Kim, Kwang-Hoon (Department of Mechanical Design engineering, College of Engineering, Pusan National University) ;
  • Son, Kwon (Department of Mechanical Design engineering, College of Engineering, Pusan National University) ;
  • Park, Jeong-Kil (Department of Conservative Dentistry, School of Dentistry, Pusan National University)
  • 박찬석 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 허복 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 김현철 (부산대학교 치의학전문대학원 치과보존학교실) ;
  • 김광훈 (부산대학교 공과대학 기계설계공학과) ;
  • 손권 (부산대학교 공과대학 기계설계공학과) ;
  • 박정길 (부산대학교 치의학전문대학원 치과보존학교실)
  • Published : 2008.05.30
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Abstract

The purpose of this study was to investigate the influence of various occlusal loading sites and directions on the stress distribution of the cervical composite resin restorations of maxillary second premolar, using 3 dimensional (3D) finite element (FE) analysis. Extracted maxillary second premolar was scanned serially with Micro-CT (SkyScan1072; SkyScan, Aartselaar, Belgium). The 3D images were processed by 3D-DOCTOR (Able Software Co., Lexington, MA, USA). HyperMesh (Altair Engineering, Inc., Troy, USA) and ANSYS (Swanson Analysis Systems, Inc., Houston, USA) was used to mesh and analyze 3D FE model. Notch shaped cavity was filled with hybrid (Z100, 3M Dental Products, St. Paul, MN, USA) or flowable resin (Tetric Flow, Vivadent Ets., FL-9494-Schaan, Liechtenstein) and each restoration was simulated with adhesive layer thickness ($40{\mu}m$). A static load of 200 N was applied on the three points of the buccal incline of the palatal cusp and oriented in $20^{\circ}$ increments, from vertical (long axis of the tooth) to oblique $40^{\circ}$ direction towards the buccal. The maximum principal stresses in the occlusal and cervical cavosurface margin and vertical section of buccal surfaces of notch-shaped class V cavity were analyzed using ANSYS. As the angle of loading direction increased, tensile stress increased. Loading site had little effect on it. Under same loading condition, Tetric Flow showed relatively lower stress than Z100 overall, except both point angles. Loading direction and the elastic modulus of restorative material seem to be important factor on the cervical restoration.

이 연구의 목적은 3차원 유한요소분석법을 사용하여 교합력의 위치와 방향이 상악 제2소구치의 치경부 복합레진 수복물의 응력분포에 미치는 영향에 대해 평가해 보고자 하였다. 발치된 상악 제2소구치를 이용하여 micro-CT (SkyScan1072; SkyScan, Aartselaar, Belgium)로 스캔한 후 HyperMesh Ver 6.0 (Altair Engineering, Inc., Troy, USA)와 3D-DOCTOR (Able Software Co., Lexington, MA, USA)로 3차원 유한요소 모형을 제작하였다. 제작된 소구치 모형에 쐐기형 와동을 형성하고 탄성계수가 서로 다른 혼합형 복합레진과 흐름성 복합레진으로 각각 수복하였다. 수복 후 설측교두의 협측사면 세 위치에 각각 수직, 20도, 40도의 각도로 하중을 가한 후 응력분포를 ANSYS Ver. 9.0 (Swanson Analysis Systems. Inc., Houston, USA) 프로그램을 이용하여 인장 응력의 분포를 분석한 바 하중 위치와 관계없이 하중방향의 각도가 증가할수록, 또한 수복재료의 탄성계수가 높을수록 인장응력도 증가하는 것으로 보아 교합력의 방향과 수복재료의 탄성계수가 치경부 수복물의 응력분포에 중요한 영향을 미치는 요소로 사료된다.

Keywords

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