[Photoelastic analysis of movement tendency of lower teeth using multiloop edgewise archwire with vertical elastics in anterior teeth area].
OBJECTIVE
To investigate the movement tendency of lower teeth using multiloop edgewise archwire (MEAW) with vertical elastics in anterior teeth area by three-dimensions photoelastic analysis.


METHODS
The photoelastical model of full teeth as human body on physical parameter and dimension was established and loaded by MEAW with vertical elastics in anterior teeth area similar with clinic. Every freezing model-tooth was bladed by anteroposterior axes and vertical axes, the stress of every point of alveolar bone was calculated by three-dimensions shear-equation method. The stress distribution regularity of per-tooth was analyzed to describe their move tendency.


RESULTS
The lower second molar was intrused and rotated to distal and inclined as negative torque. The lower first molar moved and rotated to distal, the mesial rotate to buccally and the distal rotate to lingually. The lower second pre-molar was extruded and inclined as crown to mesial and root to distal, inclined as negative torque. The lower canine was intrused slightly and inclined as positive torque. The lower lateral incisor was extruded and moved and inclined as positive torque.


CONCLUSIONS
Using MEAW with several "L" loop can control the movement of every tooth in three dimension.
Hu
Min
M
Department of Orthodontics, Hospital of Stomatology, Jilin University, Changchun 130041, China.
Liu
Lei
L
Zhang
Li-wen
LW
Wu
Hong
H
Yan
Wei-qun
WQ
Kazuto
Terada
T
D006801:Humans; D008963:Molar; D016382:Orthodontic Appliance Design; D009969:Orthodontic Wires; D014070:Tooth; D014087:Tooth Movement Techniques