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Updated: Aug 23, 2026

Force System with Vertical V-Bends: A 3D In Vitro Assessment of Elastic and Rigid Rectangular Archwires
Published on: July 24, 2018
[The three-dimensional nonlinear finite element analysis of force system of the "rocking-chair archwire"]
Li Chen1, Ding Zhang, Min-kui Fu
1Department of Orthodontics, Beijing Hospital for Stomatology, Capital University of Medical Sciences, Beijing 100050, China.
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.
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