Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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STRESS ANALYSIS OF MAXILLARY PREMOLARS WITH COMPOSITE RESIN RESTORATION OF NOTCH-SHAPED CLASSⅤCAVITY AND ACCESS CAVITY ; THREE-DIMENSIONAL FINITE ELEMENT STUDY

쐐기형 5급 와동과 근관와동을 복합레진으로 수복한 상악 소구치에 대한 응력 분석: 3차원 유한요소법적 연구

  • Lee, Seon-Hwa (Department of Conservative dentistry, School of Dentistry, Pusan National University) ;
  • Kim, Hyeon-Cheol (Department of Conservative dentistry, School of Dentistry, Pusan National University) ;
  • Hur, Bock (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)
  • 이선화 (부산대학교 치의학전문대학원 보존학교실) ;
  • 김현철 (부산대학교 치의학전문대학원 보존학교실) ;
  • 허복 (부산대학교 치의학전문대학원 보존학교실) ;
  • 김광훈 (부산대학교 공과대학 기계설계공학과) ;
  • 손권 (부산대학교 공과대학 기계설계공학과) ;
  • 박정길 (부산대학교 치의학전문대학원 보존학교실)
  • Published : 2008.11.30
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Abstract

The purpose of this study was to investigate the distribution of tensile stress of canal obturated maxillary second premolar with access cavity and notch-shaped class V cavity restored with composite resin using a 3D finite element analysis. The tested groups were classified as 8 situations by only access cavity or access cavity with notch-shaped class V cavity (S or N), loading condition (L1 or L2), and with or without glass ionomer cement base (R1 or R2). A static load of 500 N was applied at buccal and palatal cusps. Notch-shaped cavity and access cavity were filled microhybrid composite resin (Z100) with or without GIC base (Fuji II LC). The tensile stresses presented in the buccal cervical area, palatal cervical area and occlusal surface were analyzed using ANSYS. Tensile stress distributions were similar regardless of base. When the load was applied on the buccal cusp, excessive high tensile stress was concentrated around the loading point and along the central groove of occlusal surface. The tensile stress values of the tooth with class Ⅴ cavity were slightly higher than that of the tooth without class V cavity. When the load was applied the palatal cusp, excessive high tensile stress was concentrated around the loading point and along the central groove of occlusal surface. The tensile stress values of the tooth without class V cavity were slightly higher than that of the tooth with class V cavity.

이 연구의 목적은 쐐기형 5급 와동과 근관와동을 복합레진으로 수복한 상악 제2소구치에 대한 응력 분포를 3차원 유한요소법으로 분석하여 평가하기 위한 것이다. 발치된 상악 제2소구치를 이용하여 Micro-CT로 스캔한 후 3D-DOCTOR로 3차원 유한요소 모형을 제작하였다. 제작된 소구치 모형에 근관 와동을 형성하고 쐐기형 5급 와동과 글래스 아이오노머 기저재의 사용 여부를 구분하여 근관 와동을 혼합형 복합레진으로 충전하였다. 협측 교두 또는 설측 교두에 500 N의 하중을 가하고, ANSYS 8.0 프로그램으로 인장 응력의 분포를 분석하여 평가한 결과 베이스 사용유무에 따른 응력 분포의 차이는 없었다. 협측 교두에 하중이 가해질 때, 하중점과 교합면의 중심구, 구개측 백악법랑경계부에 과도한 인장 응력이 집중되었으며, 5급 와동이 없는 경우보다 5급 와동이 있는 경우에 약간 더 높았다. 설측 교두의 협측 경사면에 하중이 가해질 때, 하중점과 교합면의 중심구, 협측 치경부에 과도한 인장 응력이 집중되었으며, 5급 와동이 있는 경우가 5급 와동이 없는 경우보다 약간 더 낮았다.

Keywords

References

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