Maxillofacial Plastic and Reconstructive Surgery

Korean Association of Maxillofacial Plastic and Reconstructive Surgeons (대한악안면성형재건외과학회)
권호 표지

INFLUENCE OF MINIPLATE SHAPES AS SKELETAL ANCHORAGE FOR APPLICATION OF ORTHOPEDIC FORCE: A THREE-DIMENSIONAL FINITE ELEMENT ANALYSIS

악정형력 적용을 위한 골내 고정원으로서 미니플레이트 형상의 영향: 3차원 유한요소법적 연구

  • Lee, Nam-Ki (Department of Orthodontics, College of Dentistry, Kangnung National University) ;
  • Baek, Seung-Hak (Department of Orthodontics, School of Dentistry, Seoul National University) ;
  • Choi, Dong-Soon (Department of Orthodontics, College of Dentistry, Kangnung National University) ;
  • Park, Young-Wook (Department of Oral and Maxillofacial Surgery, College of Dentistry, Kangnung National University) ;
  • Kim, Ji-Hyuck (Department of Oral and Maxillofacial Surgery, College of Dentistry, Kangnung National University) ;
  • Cha, Bong-Kuen (Department of Orthodontics, College of Dentistry, Kangnung National University)
  • 이남기 (강릉대학교 치과대학 교정학교실) ;
  • 백승학 (서울대학교 치의학전문대학원 교정학교실) ;
  • 최동순 (강릉대학교 치과대학 교정학교실) ;
  • 박영욱 (강릉대학교 치과대학 구강악안면외과학교실) ;
  • 김지혁 (강릉대학교 치과대학 구강악안면외과학교실) ;
  • 차봉근 (강릉대학교 치과대학 교정학교실)
  • Published : 2008.07.31
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Abstract

Purpose: This study was performed to evaluate the stress distribution in the bone and the displacement distribution of the miniscrew under orthopedic force with two different types of miniplate design as skeletal anchorage for orthopedic treatment. Materials and methods: Finite element models were made for 6-hole miniplate (0.8mm in thickness), which were designed in two different shapes-one is curvilinear shaped (C plate, Jeil Medical Co., Korea) and another, Y shaped (Y plate), fixed with 3 pieces of miniscrew 2mm-diameter and 6mm-long respectively. A traction force of 4 N was applied in $0^{\circ}$, $30^{\circ}$ and $60^{\circ}$ to imaginary axis connecting two unfixed distalmost holes of the miniplate. Results: The maximum von Mises stress in the bone was much greater in the cortical portion rather than in the cancellous portion. C plate showed greater maximum von Mises stress in the cortical bone than Y plate. The maximum displacement of the miniscrew was greater in C plate than Y plate. The more increased the angle of the applied orthopedic force, the greater maximum von Mises stress in the bone and maximum displacement of the miniscrew. It was observed that in C plate, the von Mises stress in the bone and displacement of the miniscrew were distributed around the distalmost screw-fixed area. Conclusions: The results suggest that Y plate should have the advantage over C plate and in the placement of the miniplate, its imaginary axis should be placed as parallel as possible to the direction of orthopedic force to obtain its primary stability.

Keywords

References

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