松质骨和皮质骨厚度对种植体周围应力分布的影响

doi:10.13481/j.1671-587x.20160203

Abstract

Abstract:

Objective: To investigate the stress distribution surrounding an implant under different thickness of cancellous bone and cortical bone, and to analyze the influence of thickness ratio and total thickness of bone tissues on the reliability of an implant.Methods: By using the commercial finite element method software Abaqus, a simplified three-dimensional model of a jawbone consisting of a cancellous bone, a cortical bone, an implant, and a ceramic crown was constructed, and then the computation was performed.Under the condition that the system was loaded by lateral and normal stresses, the influence of thickness ratio and total thickness of cancellous bone and cortical bone in the stress distribution surrounding the implant was studied, where the thickness ratios were 3:1, 2:1, 1:1, 1:2, and 1:3; the total thickness were 0.5, 1.0, 2.0, 3.0 and 4.0 mm, respectively.Results: The maximum stresses on the cortical bone, the cancellous bone as well as the implant were all found to decrease with the increasing of the total thickness of cortical and cancellous bones, with a higher decreasing rate in the range between 0.5-2.0 mm and a lower decreasing rate between 2.0-4.0 mm.More importantly, the maximum value of stress in the cortical bone within the neck region of the implant was observed to increase dramatically via reducing the total thickness below 2 mm, while it was increased insignificantly when the total thickness was above 2.0 mm.Conclusion: The thickness ratio and the total thickness of cancellous bone and cortical bone have strong influence in the stress distribution surrounding the implant. In dental implantation surgery, the total thickness of cancellous bone and cortical bone should be at least 2 mm, and therefore 2 mm is an optimal value.

Key words: cancellous bone, cortical bone, implant, finite element analysis, bone thickness, thickness ratio

CLC Number:

R783

CHEN Qingsheng, CHEN Xiaofeng, SHAN Yejie, DING Xi, WANG Huiming. Influence of thickness of cancellous bone and cortical bone in stress distribution in vicinity of an implant[J].Journal of Jilin University Medicine Edition, 2016, 42(02): 204-209.

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Influence of thickness of cancellous bone and cortical bone in stress distribution in vicinity of an implant

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