Three-dimensional finite element analysis of the deformation of the human mandible: a preliminary study from the perspective of orthodontic mini-implant stability.
10.4041/kjod.2012.42.4.159
- Author:
Sun Hye BAEK
1
;
Hyun Suk CHA
;
Jung Yul CHA
;
Yoon Shik MOON
;
Sang Jin SUNG
Author Information
1. Division of Orthodontics, Department of Dentistry, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. ssjmail@amc.seoul.kr
- Publication Type:Original Article
- Keywords:
Orthodontic mini-implant;
Stability;
Neuromuscular force;
Anatomy;
Finite element method
- MeSH:
Adult;
Bicuspid;
Finite Element Analysis;
Humans;
Molar;
Sprains and Strains;
Traction
- From:The Korean Journal of Orthodontics
2012;42(4):159-168
- CountryRepublic of Korea
- Language:English
-
Abstract:
OBJECTIVE: The aims of this study were to investigate mandibular deformation under clenching and to estimate its effect on the stability of orthodontic mini-implants (OMI). METHODS: Three finite element models were constructed using computed tomography (CT) images of 3 adults with different mandibular plane angles (A, low; B, average; and C, high). An OMI was placed between #45 and #46 in each model. Mandibular deformation under premolar and molar clenching was simulated. Comparisons were made between peri-orthodontic mini-implant compressive strain (POMI-CSTN) under clenching and orthodontic traction forces (150 g and 200 g). RESULTS: Three models with different mandibular plane angles demonstrated different functional deformation characteristics. The compressive strains around the OMI were distributed mesiodistally rather than occlusogingivally. In model A, the maximum POMI-CSTN under clenching was observed at the mesial aspect of #46 (1,401.75 microstrain [microE]), and similar maximum POMI-CSTN was observed under a traction force of 150 g (1,415 microE). CONCLUSIONS: The maximum POMI-CSTN developed by clenching failed to exceed the normally allowed compressive cortical bone strains; however, additional orthodontic traction force to the OMI may increase POMI-CSTN to compromise OMI stability.
