Investigation of the Regression Analysis Method for a Quantitative Evaluation of Implant Crestal Bone Stresses

회귀분석법에 의한 임플란트 경부골 응력의 정량적 분석에 대한 연구

  • Kim, Woo-Shik (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Jo, Kwang-Hun (Department of Prosthodontics, School of Dentistry, Kyungpook National University) ;
  • Lee, Kyu-Bok (Department of Prosthodontics, School of Dentistry, Kyungpook National University)
  • 김우식 (경북대학교 치의학전문대학원 치과보철학교실) ;
  • 조광헌 (경북대학교 치의학전문대학원 치과보철학교실) ;
  • 이규복 (경북대학교 치의학전문대학원 치과보철학교실)
  • Received : 2008.06.21
  • Accepted : 2008.09.25
  • Published : 2008.09.30

Abstract

In this study, the regression analysis method was tested for the estimation of peak stress at stress concentration area in the cervical bone. Submerge type EZ plus implant (Megagen. Daegu, Korea), 4.1 mm in cervical diameter and 9.6 mm in endosseous length, were axisymmetrically modelled together with surrounding alveolar bone of which the width was 10 mm. Vertical force of 100 N was applied to a head of crown above 8.5 mm from the outer surface of the cortical bone. Four different mesh models were composed of differently sized elements in vicinity of sharp corners, and they include 6 stress monitoring points that are located in the same geometrical points regardless of the differences in the meshes. Primary consideration was given to the stresses in the cortical bone surrounding the implant neck. The results showed that virtually all the stresses were concentrated in the cortical bone regardless of mesh designs. The peak stresses were successfully calculated by a regression analysis in a stable manner, as far as the mesh is designed to represent the acute gradient of stresses near the sharp corner.

Keywords

finite element analysis;implant crestal bone stresses;regression analysis

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