Finite Element Analysis of Stress Distribution in using Face Mask according to Traction Point

훼이스 마스크의 견인위치에 따른 응력분포에 관한 유한요소법적 연구

  • Oh, Kyo-chang (Department of Orthodontics, School of Dentistry, Dankook University) ;
  • Cha, Kyung-Suk (Department of Orthodontics, School of Dentistry, Dankook University) ;
  • Chung, Dong-hwa (Department of Orthodontics, School of Dentistry, Dankook University)
  • 오교창 (단국대학교 치과대학 교정학교실) ;
  • 차경석 (단국대학교 치과대학 교정학교실) ;
  • 정동화 (단국대학교 치과대학 교정학교실)
  • Received : 2009.02.10
  • Accepted : 2009.06.25
  • Published : 2009.06.30

Abstract

The objective of this study was to analyse stress distribution of maxillary complex by use of face mask. The construction of the three-dimensional FEM model was based on the computed tomography(CT) scans of 13.5 years-old male subject. The CT image were digitized and converted to the finite element model by using the mimics program, with PATRAN. An anteriorly directed force of 500g was applied at the first premolar 45 degrees downwards to the FH plane and at the first molar 20 degrees downwards to the FH plane. When 45 degrees force was applied at maxillary first premolar, there were observed expansion at molar part and constriction at premolar part. The largest displacement was 0.00011mm in the x-axis. In the y-axis, anterior displacement observed generally 0.00030mm at maximum. In the z-axis, maxillary complex was displaced 0.00036 mm forward and downward. When 20 degrees force was applied at maxilla first molar, there were observed expansion at lateral nasal wall and constriction at molar part. The largest displacement was 0.001mm in the X-axis. In the Y-axis, anterior displacement observed generally 0.004mm at maximum. In the Z-axis, ANS was displaced upward and pterygoid complex was displaced downward. The largest displacement was 0.002mm.

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