Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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Effects of occlusal load on the stress distribution of four cavity configurations of noncarious cervical lesions: A three-dimensional finite element analysis study

네 가지 형태의 비우식성 치경부 병소의 3차원 유한요소법적 응력분석

  • Jeon, Sang-Je (Department of Conservative Dentistry, College of Dentistry, Pusan National University) ;
  • Park, Jeong-Kil (Department of Conservative Dentistry, College of Dentistry, Pusan National University) ;
  • Kim, Hyeon-Cheol (Department of Conservative Dentistry, College of Dentistry, Pusan National University) ;
  • Woo, Sung-Gwan (Department of Mechanical design engineering, College of Engineering, 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) ;
  • Hur, Bock (Department of Conservative Dentistry, College of Dentistry, Pusan National University)
  • 전상제 (부산대학교 치과대학 치과보존학교실) ;
  • 박정길 (부산대학교 치과대학 치과보존학교실) ;
  • 김현철 (부산대학교 치과대학 치과보존학교실) ;
  • 우성관 (부산대학교 공과대학 기계설계공학과) ;
  • 김광훈 (부산대학교 공과대학 기계설계공학과) ;
  • 손권 (부산대학교 공과대학 기계설계공학과) ;
  • 허복 (부산대학교 치과대학 치과보존학교실)
  • Published : 2006.09.01
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Abstract

The objective of this study was to investigate the effect of excessive occlusal loading on stress distribution on four type of cervical lesion, using a three dimensional finite element analysis (3D FEA). 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. Four different lesion configurations representative of the various types observed clinically for teeth were studied. A static point load of 500N was applied to the buccal and lingual cusp (Load A and B). The principal stresses in lesion apex, and vertical sectioned margin of cervical wall were analyzed. The results were as follows 1. The patterns of stress distribution were similar but the magnitude was different in four types of lesion 2. The peak stress was observed at mesial corner and also stresses concentrated at lesion apex. 3. The compressive stress under load A and the tensile stress under load B were dominant stress. 4. Under the load, lesion can be increased and harmful to tooth structure unless restored.

본 연구의 목적은 네 가지 형태의 비우식성 치경부 병소에 과다한 교합하중을 가했을 때 각 와동에 나타나는 응력 분포를 3차원적으로 조사하고자 하였다. 임상적으로 많이 관찰되는 다양한 형태의 병소 중 4가지 형태의 서로 다른 병소를 대표적으로 선택하여 발치된 상악 제2소구치에 3차원 유한요소 모형을 제작하였다. 형성된 모형에 협측교두와 설측교두에 500 N의 하중을 가한 후 치경부병소 첨부와 수직 절단면의 주 응력을 분석하여 다음과 같은 결과를 얻었다. 1 서로 다른 네 가지 형태의 와동에서 응력분포 양상은 비슷했지만 응력의 크기가 서로 달랐다. 2. 최대치 응력은 근심협측 우각부에서 나타났으며, 또한 병소의 첨부에 응력의 집중을 보였다. 3. 하중 A에서는 주된 응력이 압축 응력이었고 하중 B에서는 주된 응력이 인장 응력이었다. 4. 이러한 하중 하에서 수복치료를 하지 않으면 와동의 크기는 점차 커지고 치아구조에는 유해하게 작용하리라 생각된다.

Keywords

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