无托槽隐形矫治不同控根附件对磨牙近中移动力学影响的三维有限元分析

doi:10.19439/j.sjos.2018.02.006

上海口腔医学 ›› 2018, Vol. 27 ›› Issue (2): 139-145.doi: 10.19439/j.sjos.2018.02.006

无托槽隐形矫治不同控根附件对磨牙近中移动力学影响的三维有限元分析

曾红¹, 王超^1,2,3, 周建萍^1,2, 吴艳^1,2, 戴红卫¹

1.重庆医科大学附属口腔医院,2.口腔疾病与生物医学重庆市重点实验室, 3.重庆市高校市级口腔生物医学工程重点实验室,重庆 401147

收稿日期:2017-09-11 修回日期:2017-12-05 出版日期:2018-04-25 发布日期:2018-05-14
通讯作者: 戴红卫,E-mail：dai_tg@163.com
作者简介:曾红（1990-）,女,在读硕士研究生,E-mail：960114401@qq.com
基金资助:
重庆市渝北区科学技术委员会自然科学基金[2014（社）10号)]; 重庆市渝中区科学技术委员会自然科学基金（2015.No.16）

Effect of different root control attachments on the mesially movement of upper molar with plastic aligner

ZENG Hong¹, WANG Chao^1,2,3, ZHOU Jian-Ping^1,2, WU Yan^1,2, DAI Hong-Wei¹

1.Stomatological Hospital of Chongqing Medical University, 2. Chongqing Key Laboratory of Oral Disease and Biomedicine, 3.Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education. Chongqing 401147, China

Received:2017-09-11 Revised:2017-12-05 Online:2018-04-25 Published:2018-05-14

摘要/Abstract

摘要： 目的:利用三维有限元分析,探讨无托槽隐形矫治中不同控根附件在磨牙近中移动过程中的力学影响。方法:利用锥形束CT（CBCT）扫描获取上颌骨数据,采用Mimics、Geomagic、Solidworks和Ansys等软件建立包括左侧上颌第一磨牙及其牙周组织、隐形矫治器和不同控根附件的4个三维有限元模型,即模型A-无附件;模型B-颊侧垂直矩形附件;模型C-颊侧单个半圆柱形优化附件;模型D-颊侧双半圆柱形优化附件。模拟上颌第一磨牙在隐形矫治器作用下的近中移动,比较其周围牙周膜应力分布、位移模式和牙槽窝近中内表面应力分布。结果:颊侧双半圆柱形优化附件模型的近中牙周膜压力分布和近中牙槽窝应力分布最广泛,旋转中心最靠近根尖孔,其控根效果最好。颊侧垂直矩形附件牙周膜近中面压力分布靠颊侧明显比靠腭侧广泛,颊侧位移旋转中心比腭侧明显靠近根尖孔,说明此附件对颊侧控根效果优于腭侧。单个颊侧半圆柱形优化附件的牙周膜受力及位移模式与无附件相比无显著差别,但位移最大值更大。结论:添加控根附件后,增加了上颌第一磨牙近中移动的效率。颊侧双半圆柱形优化附件控根的作用优于传统矩形附件,但是所有的附件组合均使磨牙发生近中倾斜移动。

关键词: 无托槽隐形矫治, 上颌磨牙, 控根附件, 倾斜移动

Abstract: PURPOSE: Three-dimensional (3D) finite element analysis (FEA) was used to explore the mechanical effect of the upper molar with different root control attachment in plastic aligner-based orthodontic technology. METHODS: A three-dimensional(3D) finite element model was derived from a cone-beam CT(CBCT) scan data and then built in the software of Mimics, Geomagic, Solidworks and Ansys. A model with an upper left first molar and its periodontal apparatus, different types of light-cured composite attachments and thermoformed plastic aligners were constructed. Four models were constructed: model A without composite attachments, model B with vertical rectangular attachment, model C with one optimized semiterete attachment, model D with two optimized semiterete attachments. Four FE models were used to analyze the effects of initial force system and displacement pattern of the molar in plastic aligner-mediated simulating mesial movement with different attachments. The initial tooth displacement, tension-compression pattern at the PDL and Von Mises stress in mesial alveolar fossa of different FE models were compared. RESULTS: In model D with two optmisied semiterete attachments, the compression stress of mesial periodontal ligament and the stress of mesi alveolar fossa were most widely distributed. The rotation axis was closest to the apical foramen, the root control effect of the molar was the best. In model B with buccal vertical rectangular, the compression stress of mesial periodontal ligament closer to buccal side was obviously wider than that of the palate. The rotation center of the buccal side was obviously near the apical foramen than the palatal side. The effect of buccal root control was better than that of palatal side. In model C with one semiterete optimized attachment, the stress pattern of the periodontal ligament in the mesial surface and the displacement patterns were not significantly different from those of model A with no attachments, but the maximum displacement of model C was greater than that of model A. CONCLUSIONS: The addition of attachments increased the molar's movement efficiency. Two semiterete optimized attachments on the buccal side had the best root control effect during mesial movement of the molar, but all attachments achieved tipping movement of the molar.

Key words: Plastic aligner, Upper molar, Root control attachment, Tipping movement

中图分类号:

R783.5

曾红, 王超, 周建萍, 吴艳, 戴红卫. 无托槽隐形矫治不同控根附件对磨牙近中移动力学影响的三维有限元分析[J]. 上海口腔医学, 2018, 27(2): 139-145.

ZENG Hong, WANG Chao, ZHOU Jian-Ping, WU Yan, DAI Hong-Wei. Effect of different root control attachments on the mesially movement of upper molar with plastic aligner[J]. Shanghai Journal of Stomatology, 2018, 27(2): 139-145.

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无托槽隐形矫治不同控根附件对磨牙近中移动力学影响的三维有限元分析

Effect of different root control attachments on the mesially movement of upper molar with plastic aligner

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