Three-dimensional finite element analysis of anchorage micro-implant with different embedding directions
10.3724/SP.J.1008.2008.00829
- Author:
Han-Si WANG
1
Author Information
1. Department of Stomatology
- Publication Type:Journal Article
- Keywords:
Biomechanics;
Dentalimplants;
Embedding direction;
Finite element analysis
- From:
Academic Journal of Second Military Medical University
2010;29(7):829-832
- CountryChina
- Language:Chinese
-
Abstract:
Objective: To establish a simplified three-dimensional finite element model of orthodontic anchorage micro-implant, and to study the biomechanical changes of the micro-implant-bone interface when embedded in different directions,so as to provide a theoretical basis for clinical application of the micro-implant. Methods: I-DEAS finite element analysis software was used to establish a micro-implant and bone finite element model. The micro-implant was embedded into the bone at an angle of 30°. The orientation of the loading force and the embedding angle were kept unchanged; using the embedded point as the center of a circle and the projective line of micro-implant on the bone surface as the radius, 5 different embedding directions, including 0°,45°,90°,135° and1.80°, were chosen. A simulated orthodontic force of 200 g was loaded parallel to the surface of bone in the embedded region, and the stress distribution and displacement changes on the micro-implant-bone interface were analyzed. Results: The changes of stresses and displacement were within the clinicophysiological range in all groups. The embedded region of micro-implant and the cortical bone were stress-focused areas. The changes of Von-mises stress, stretching stress and compressive stress were largely the same; the stress distribution had a decreasing tendency. Under retentive force, the stresses of group 0° and 45° were smaller than those of the other groups, with group 0° having the smallest one. The displacement of group 0° and 45° were evidently larger than those of group 90°, 135° and 180° with that of group 90° having the smallest one. Conclusion: The micro-implant embedded with different directions can safely bear 200 g force parallel to the surface of bone in embedded region. When choose the embedding directions of micro-implant efforts should be made to reduce the retentive effect of the loaded force to keep the stability of micro-implant.
