Effect of three types of rapid maxillary expansion: a three-dimensional finite element study
10.3760/cma.j.issn.1002-0098.2017.11.006
- VernacularTitle: 三种上颌快速扩弓方式扩弓效果的三维有限元分析
- Author:
Menghan WANG
1
;
Zhenlin GE
1
;
Li TIAN
1
;
Peirong LI
1
;
Yuanqian CHE
1
Author Information
1. Department of Orthodontics, School of Stomatology, Lanzhou University, Lanzhou 730000, China
- Publication Type:Journal Article
- Keywords:
Finite element analysis;
Palatal expansion technique;
Orthodontic anchorage procedures;
Mini-screw
- From:
Chinese Journal of Stomatology
2017;52(11):678-683
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To evaluate the transverse displacement, stress distribution and tendency of change in tooth, alveolar bone and mid-palatal suture using three kinds of rapid maxillary expansion methods.
Methods:Cone-beam CT image data was obtained by scanning skulls of a volunteer. Three-dimensional models of maxillary complex were re-established using Mimics and Geomagic Studio and models of Hyrax expander, Haas expander and miniscrew-assisted rapid palatal expander (MARPE) were established using ANSYS Workbench. Stress distribution, displacement and tendency of change in tooth, alveolar bone and mid-palatal suture were evaluated.
Results:Hyrax expander brought 0.105 mm lateral displacement of crown, 0.022 mm mid-palatal suture width increase, wedge opening and clockwise rotation tendency of maxilla. Haas expander created uniform stress distribution, 0.216 mm lateral displacement of crown, and 0.031 mm mid-palatal suture width increase. In MARPE model, the lateral displacement of crown was 0.267 mm, and mid-palatal suture width increased 0.315 mm. The maximum of mid-palatal suture expansion and stress distribution appeared in the middle region, and maxilla had tendency of counterclockwise rotation.
Conclusions:The lateral changes of teeth and bones brought by MARPE were the most significant. Haas expander had some advantages in comparison with Hyrax.
