一阶和二阶三角形弯曲对T形曲弓丝产生的正畸载荷系统的影响。
Effects of first- and second-order gable bends on the orthodontic load systems produced by T-loop archwires.
作者信息
Katona Thomas R, Isikbay Serkis C, Chen Jie
机构信息
a Associate Professor, Department of Orthodontics and Oral Facial Genetics, Indiana University School of Dentistry, and Department of Mechanical Engineering, Purdue University School of Engineering and Technology, IUPUI, Indianapolis, Ind.
出版信息
Angle Orthod. 2014 Mar;84(2):350-7. doi: 10.2319/031413-219.1. Epub 2013 Aug 29.
OBJECTIVE
To measure the effects of first- and second-order gable bends on the forces and moments produced by a commercially available closing T-loop archwire.
MATERIALS AND METHODS
A dentoform-simulated space closure case was mounted on an orthodontic force tester. Sixteen gable bend combinations were placed in the archwires, which were then activated using standard clinical procedures. At each activation, the three force components and three moment components on the maxillary left lateral incisor and canine were simultaneously measured.
RESULTS
The first- and second-order gable bends showed low load coupling effects when used independently, but the load systems became unpredictable when bends were combined. Gable bends affect the magnitudes and directions of the forces and moments that are applied to teeth. The resulting moment to force ratios are sensitive to the bends.
CONCLUSION
Gable bends alter the orthodontic load systems; however, the three-dimensional interactions produce complex and unpredictable tradeoffs.
目的
测量一阶和二阶三角形曲对市售闭合T形曲弓丝产生的力和力矩的影响。
材料与方法
将一个牙模模拟的间隙关闭病例安装在正畸力测试仪上。在弓丝中放置16种三角形曲组合，然后使用标准临床程序激活。每次激活时，同时测量上颌左侧侧切牙和尖牙上的三个力分量和三个力矩分量。
结果
一阶和二阶三角形曲单独使用时显示出低负荷耦合效应，但当曲组合时，负荷系统变得不可预测。三角形曲会影响施加于牙齿的力和力矩的大小和方向。由此产生的力矩与力的比值对曲很敏感。
结论
三角形曲会改变正畸负荷系统；然而，三维相互作用会产生复杂且不可预测的权衡。
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