下颌牙列整体远移的生物力学分析：有限元研究。
Biomechanical analysis for total distalization of the mandibular dentition: A finite element study.
机构信息
Department of Orthodontics, School of Dentistry, University of Wonkwang, Wonkwang Dental Research Institute, Iksan, Korea; Postgraduate Orthodontic Program, Arizona School of Dentistry and Oral Health, A.T. Still University, Mesa, Ariz.
Postgraduate Orthodontic Program, Arizona School of Dentistry and Oral Health, A.T. Still University, Mesa, Ariz; Graduate School of Dentistry, Kyung Hee University, Seoul, Korea.
出版信息
Am J Orthod Dentofacial Orthop. 2019 Mar;155(3):388-397. doi: 10.1016/j.ajodo.2018.05.014.
INTRODUCTION
The aim of this finite element study was to analyze and clarify the mechanics of tooth movement patterns for total distalization of the mandibular dentition based on force angulation.
METHODS
Long-term orthodontic movement of the mandibular dentition was simulated by accumulating the initial displacement of teeth produced by elastic deformation of the periodontal ligament.
RESULTS
Displacement of each tooth was caused by movement of the whole dentition, elastic deflection of the archwire, and clearance gap between the archwire and bracket slot. The whole dentition was rotated clockwise or counterclockwise when the line of action of the force passed below or above the center of resistance. Elastic deflection of the archwire induced a lingual tipping of the anterior teeth. It became larger when increasing the magnitude of angulation. The archwire could be rotated within the clearance gap between the archwire and the bracket slot, and thereby the teeth tipped.
CONCLUSIONS
Mechanics of total mandibular distalization was clarified. Selective use of force angulation with a careful biomechanical understanding can achieve proper distalization of the whole mandibular dentition.
简介
本有限元研究旨在通过力角度分析，阐明下颌牙列整体远移的牙齿移动模式的力学机制。
方法
通过累积牙周韧带弹性变形产生的初始牙齿位移来模拟长期正畸牙齿移动。
结果
每个牙齿的位移是由整个牙列的运动、弓丝的弹性偏斜以及弓丝和托槽槽之间的间隙引起的。当力的作用线通过阻力中心下方或上方时，整个牙列会顺时针或逆时针旋转。弓丝的弹性偏斜导致前牙舌倾。随着角度增大而增大。弓丝可以在弓丝和托槽槽之间的间隙内旋转，从而使牙齿倾斜。
结论
阐明了下颌牙列整体远移的力学机制。选择性使用力角度，并结合仔细的生物力学理解，可以实现整个下颌牙列的适当远移。
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