[Study of tooth movement under different loading force system by FEM].
OBJECTIVE
To investigate different type of tooth movement under different force systems by simulating clinical loading force systems.


METHODS
Develop a three-dimensional finite element model of upper central incisor, which consists of 945 isoparametric elements, 1245 nodes. Analyse the types of tooth movement under different force system with a horizontal force of 1 N being applied at the upper central incisor.


RESULTS
Different force systems(M/F) lead to different types of tooth movement. This study showed the relation between them. When M/F =-9.15:1,it bringed the result of the controlled tipping movement, When M/F=-10.30 -10.50:1, it bringed the bodily movement; While M/F=-10.90:1, it lead to the root movement.


CONCLUSIONS
This study suggested that it is necessary to adopt different loading force systems in order ot obtain determined tooth movement.
Department of Orthodontics, School of Stomatology, Shandong University, Jinan, Shandong 250012, China. Liudongxu@sdu.edu.cn
Dong-xu
DX
Liu
Chuan-yun
CY
Fu
Chun-ling
CL
Wang
Xiao-yan
XY
Zhang
Wei-xiao
WX
Tang
Xiao-zhong
XZ
Zheng