Lacoursiere Ryan A, Nobes David S, Homeniuk Darren L N, Carey Jason P, Badawi Hisham H, Major Paul W
Orthodontic Graduate Program, Department of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, AB, Canada T6G 2N8.
J Dent Biomech. 2010;2010. doi: 10.4061/2010/397037. Epub 2009 Dec 13.
Orthodontic lingual root movement (torque) is an important aspect of treatment biomechanics and is typically achieved by torsion of a rectangular wire within the orthodontic bracket slot which introduces a force couple. The magnitude of the force moment achieved by wire torsion may be influenced by deformation of the orthodontic bracket. A device utilizing an optical image correlation technique has been developed to accurately quantify bracket slot dimensional changes during application of wire torsion. Simultaneous torque moment magnitude, degrees of wire twist, and bracket slot dimension data can be gathered. Bracket tie wing elastic deformation when loaded was demonstrated and plastic deformation was also observed with a single rotation of the wire.
正畸舌向牙根移动（转矩）是治疗生物力学的一个重要方面，通常通过在正畸托槽槽沟内扭转矩形弓丝来实现，这会产生一个力偶。弓丝扭转所产生的力力矩大小可能会受到正畸托槽变形的影响。已开发出一种利用光学图像相关技术的装置，以准确量化弓丝扭转过程中托槽槽沟尺寸的变化。可以同时收集转矩力矩大小、弓丝扭转度数和托槽槽沟尺寸数据。结果表明，加载时托槽结扎翼会发生弹性变形，并且在弓丝单次旋转时也观察到了塑性变形。
