[The three-dimensional nonlinear finite element analysis of force system of the "rocking-chair archwire"].
OBJECTIVE
The purpose of this study was to qualitatively and quantitatively analyze the initial force system of "rocking-chair archwire" on every tooth.


METHODS
Three-dimensional finite element model of "rocking-chair archwire" was set up, and nonlinear method was used to analyze the force system.


RESULTS
The archwire exerted intruding force, labial force, lingual-root torque and mesial-labial moment on incisors; Extruding force, lingual-root torque and mesial-labial moment were applied on canines and premolars; The archwire also created intruding force, buccal force, buccal-root torque and mesial-labial moment on molars.


CONCLUSIONS
"rocking-chair archwire" produced a complicated force system. While intruding incisors, molars and extruding premolars. It has a tendency to induce tooth rotation and tipping.
Chen
Li
L
Department of Orthodontics, Beijing Hospital for Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
Zhang
Ding
D
Fu
Min-kui
MK
Sun
Shu-li
SL
Liang
Ying
Y
D003799:Dental Stress Analysis; D020342:Finite Element Analysis; D006801:Humans; D008310:Malocclusion / Q000628:therapy*; D016382:Orthodontic Appliance Design; D009969:Orthodontic Wires; D009971:Orthodontics, Corrective / Q000379:methods*