title: A numerical simulation of orthodontic tooth movement produced by a canine retraction spring.
abstract: Tooth movements produced by a canine retraction spring were calculated. Although a gable bend and an anti-rotational bend were incorporated into the spring, the canine tipped and rotated initially. Retraction force decreased and moment-to-force ratio increased after the spring legs closed. Then, the initial tipping and rotation began to be corrected. As a result, the canine moved almost bodily after a prolonged period of time. Such tooth movements cannot be estimated from the initial force system. The gable bend decreased tipping movement, but increased rotational movement. On the other hand, the anti-rotational bend decreased rotational movement but increased tipping movement. In other words, one bend decreased the effect of the other, when both bends were incorporated in the spring.
authors: Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan. kojima.yukio@nitech.ac.jp
authors: Yukio
authors: Y
authors: Kojima
authors: Toshihiro
authors: T
authors: Mizuno
authors: Sachio
authors: S
authors: Umemura
authors: Hisao
authors: H
authors: Fukui
mesh_terms: D003481:Cuspid; D003799:Dental Stress Analysis / Q000379:methods*; D020342:Finite Element Analysis; D006801:Humans; D012399:Rotation; D014087:Tooth Movement Techniques / Q000295:instrumentation* / Q000379:methods