上颌弓力/偶系统分析模拟高位尖牙错颌：第 1 部分。被动结扎。
Analysis of maxillary arch force/couple systems for a simulated high canine malocclusion: Part 1. Passive ligation.
机构信息
Department of Dentistry, University of Alberta, Edmonton, Canada.
出版信息
Angle Orthod. 2011 Nov;81(6):953-9. doi: 10.2319/012011-40.1. Epub 2011 Jul 20.
Abstract
OBJECTIVE
To better understand the mechanics of bracket/archwire interaction through analysis of force and couple distribution along the maxillary arch.
MATERIALS AND METHODS
An orthodontic simulator was utilized to study high canine malocclusion. Force/couple distributions, referenced to the center of resistance (CR) of each tooth, produced by passive ligation brackets and round wire were measured. Tests were repeated for 12 bracket sets with 12 wires per set.
RESULTS
Propagation of the force/couple systems around the arch was minimal. Binding was observed only on the teeth adjacent to the displaced canine. For most of the teeth, reduced resistance to sliding of the passive ligation bracket yielded minimal tangential and normal forces at the bracket and contributed to lower moments at CR.
CONCLUSIONS
Some potential mechanical advantages of passive ligation systems are suggested for the case studied. In particular, limited propagation around the arch reduces the occurrence of unwanted force/couple systems.
摘要
目的
通过分析上颌弓上的力和力矩分布，更好地了解托槽/弓丝相互作用的机制。
材料与方法
利用正畸模拟器研究高尖牙错[牙合]。测量被动结扎托槽和圆丝产生的、参考每个牙的阻力中心（CR）的力/力矩分布。每个托槽组重复 12 次测试，每组 12 根弓丝。
结果
力/力矩系统在弓上的传播最小。只有在与移位尖牙相邻的牙齿上观察到了约束力。对于大多数牙齿，被动结扎托槽的滑动阻力减小导致托槽处的切向和法向力最小，并导致 CR 处的力矩降低。
结论
针对所研究的病例，提出了被动结扎系统的一些潜在机械优势。特别是，弓上的力/力矩系统的有限传播减少了不期望的力/力矩系统的发生。
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