A Numerical Simulation of Orthodontic Tooth Movement Produced by a Canine Retraction Spring

DOI NDLデジタルコレクション Web Site 被引用文献4件 参考文献35件
  • KOJIMA Yukio
    Department of Mechanical Engineering, Nagoya Institute of Technology
  • MIZUNO Toshihiro
    Department of Mechanical Engineering, Kanagawa Institute of Technology
  • UMEMURA Sachio
    Division of Orthodontics and Dentofacial, Department of Oral Growth and Development, OHU University School of Dentistry
  • FUKUI Hisao
    Department of Dental Materials Science, School of Dentistry, Aichi-Gakuin University

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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.

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