Jifang Hui, Han Zhang, Xiaodong Qu, Weijun Yan, Ping Shao
Hua Xi Kou Qiang Yi Xue Za Zhi. 2015 Feb;33(1):67-70. doi: 10.7518/hxkq.2015.01.015.
This study aims to do the following: construct a three-dimensional finite element model of an labial inverted impacted maxillary central incisor and its supporting tissues, analyze stress distribution in the periodontal tissue when various tractions are exerted, and provide references for treating impacted maxillary central incisor.
A three-dimensional finite element model oflabial inverted impacted maxillary central incisor and its periodontal tissues was established using Mimics 10.01 and Ansys 14.0 software based on original cone beam computed tomography (CBCT) data. Various traction values (20, 30, 40, 50, 60, and 70 g) were exerted on the incisal margin in the direction perpendicular to the impacted tooth. Different Von Mises stress values were determined.
Stress distribution on the periodontal ligament increased with traction size. When 30 g traction was exerted on the labial inverted impacted maxillary central incisor, the Von Mises stress was 24 919.0 Pa, which was within the range of the optimum force and close to its maximum value.
The optimum traction for early orthodontic treatment of labial inverted impacted maxillary central incisor is nearly 30 g.
本研究旨在进行以下工作：构建唇侧倒置埋伏上颌中切牙及其支持组织的三维有限元模型，分析施加不同牵引力时牙周组织的应力分布情况，为治疗埋伏上颌中切牙提供参考。
基于原始锥形束计算机断层扫描（CBCT）数据，使用Mimics 10.01和Ansys 14.0软件建立唇侧倒置埋伏上颌中切牙及其牙周组织的三维有限元模型。在垂直于埋伏牙的方向上，对切缘施加不同的牵引力值（20、30、40、50、60和70克），测定不同的冯·米塞斯应力值。
牙周膜上的应力分布随牵引力大小增加。当对唇侧倒置埋伏上颌中切牙施加30克牵引力时，冯·米塞斯应力为24919.0帕，处于最佳力的范围内且接近其最大值。
唇侧倒置埋伏上颌中切牙早期正畸治疗的最佳牵引力约为30克。
