阻力中心是否取决于牙齿的移动方向？
Does the center of resistance depend on the direction of tooth movement?
机构信息
Department of Mechanical Engineering and Department of Orthodontics and Oral Facial Genetics, Indiana University Purdue University Indianapolis, Indianapolis, IN 46202, USA.
出版信息
Am J Orthod Dentofacial Orthop. 2010 Mar;137(3):354-61. doi: 10.1016/j.ajodo.2008.03.029.
INTRODUCTION
The objective of this study was to compare the locations of the centers of resistance (CRes) in the buccolingual (BL) and mesiodistal (MD) directions of the mandibular central incisors of 6 dogs.
METHODS
Based on microcomputed tomography images of the teeth and their supporting tissues, solid models were used to build finite element models.
RESULTS
The CRes locations for the 6 specimens were determined for displacements in the BL and MD directions with finite element calculations. Measured from the alveolar crest, the BL and MD locations were 43% to 51% and 31% to 43% of root length, respectively. Their average locations, 46.2% and 38.3%, were statistically different at the 95% CI.
CONCLUSIONS
The CRes location for BL tooth movement is significantly more apical than its MD counterpart.
简介
本研究的目的是比较 6 只狗下颌中切牙颊舌（BL）和近远中（MD）方向阻力中心（CRes）的位置。
方法
基于牙齿及其支持组织的微计算机断层扫描图像，使用实体模型构建有限元模型。
结果
通过有限元计算确定了 6 个标本在 BL 和 MD 方向的 CRes 位置。从牙槽嵴测量，BL 和 MD 位置分别为根长的 43%至 51%和 31%至 43%。它们的平均位置分别为 46.2%和 38.3%，在 95%置信区间内有统计学差异。
结论
BL 牙齿移动的 CRes 位置明显比 MD 更根尖。
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