[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.
Liu
Dong-xu
DX
Department of Orthodontics, School of Stomatology, Shandong University, Jinan, Shandong 250012, China. Liudongxu@sdu.edu.cn
Fu
Chuan-yun
CY
Wang
Chun-ling
CL
Zhang
Xiao-yan
XY
Tang
Wei-xiao
WX
Zheng
Xiao-zhong
XZ