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

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)
Publication Information
Journal of Dental Rehabilitation and Applied Science / v.24, no.3, 2008 , pp. 299-310 More about this Journal
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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