Three-dimensional finite element analysis of the stress at the interface between micro-implants with dif-ferent screw thread shape and bone
10.3969/j.issn.1001-3733.2025.01.006
- VernacularTitle:不同螺纹形态微种植体-骨界面应力的三维有限元法分析
- Author:
Yanjun HE
1
Author Information
1. 510630 广州,暨南大学附属第一医院口腔修复科
- Publication Type:Journal Article
- Keywords:
Micro-implant;
Three-dimensional finite element;
Stress;
Thread depth;
Thread distance
- From:
Journal of Practical Stomatology
2025;41(1):41-45
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To investigate the impact of thread depth and pitch on the stress magnitude and distribution characteristics at the interface between the mini-implant and bone studied by three-dimensional finite element analysis(3D FEA).Methods:The approach of this study involved the use of CBCT scanning technology in the combination with medical image processing software Mimics,reverse engineering software Geomagic,3D design software SolidWorks and 3D FEA software Ansys Workbench.This methodology was employed to 3D FEA models of mini-implants with various thread morphologies and their supporting bone struc-tures,based on the geometric form of osstem mini-implants.Axial load was applied and the influence of thread depth and thread distance on the stress magnitude and stress distribution pattern of the micro implant bone interface was analyzed.Results:Both thread depth and thread distance affected the stress magnitude at the micro implant bone interface,but do not alter the stress distri-bution pattern.The cortical bone area in the neck of the micro implant and the trabecular bone area at the root apex were both stress concentration areas.The most reasonable conditions for this experiment were a 2.5 mm diameter pure titanium micro implant with a thread height of 0.3 mm and a thread distance of 0.6 mm.Conclusion:The design criteria for threads should avoid excessive or insufficient thread depth and thread distance.
