title: Investigation of the effects of graded models on the biomechanical behavior of a bone-dental implant system under osteoporotic conditions.
abstract: OBJECTIVE
  To investigate the effects of graded models on the biomechanical behavior of a bone-implant system under osteoporotic conditions. Methodology : A finite element model (FEM) of the jawbone segments with a titanium implant is used. Two types of models (a graded model and a non-graded model) are established. The graded model is established based on the graded variation of the elastic modulus of the cortical bone and the non-graded model is defined by homogeneous cortical bone. The vertical and oblique loads are adopted. The max von Mises stresses and the max displacements of the cortical bone are evaluated.
  
  
  RESULTS
  Comparing the two types of models, the difference in the maximum von Mises stresses of the cortical bone is more than 20%. The values of the maximum displacements in the graded models are considerably less than in the non-graded models.
  
  
  CONCLUSIONS
  These results indicate the significance of taking into account the actual graded properties of the cortical bone so that the biomechanical behavior of the bone-implant system can be analyzed accurately.
authors.affiliation: Ying Li, DDS, Institute of Hard Tissue Development and Regeneration, the Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Li
authors.affiliation: Zhong Shuang Liu, DDS, Institute of Hard Tissue Development and Regeneration, the Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China.
authors.forename: Zhong
authors.initials: Z
authors.lastname: Shuang Liu
authors.affiliation: Xiao Ming Bai, PhD, Department of Astronautic Science and Mechanics, Harbin Institute of Technology, Harbin 150001, China.
authors.forename: Xiao
authors.initials: X
authors.lastname: Ming Bai
authors.affiliation: Bin Zhang, PhD. DDS, Institute of Hard Tissue Development and Regeneration, the Second Affiliated Hospital of Harbin Medical University, Harbin 150001, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Zhang
keywords: Biomechanical behavior; Cortical bone; Finite element analysis; Graded model