上海口腔医学

上海口腔医学 ›› 2022, Vol. 31 ›› Issue (2): 162-166.doi: 10.19439/j.sjos.2022.02.009

• 论著 • 上一篇    下一篇

个性化舌侧上颌前牙滑动内收三维有限元构建与分析

徐子卿, 王特, 蒋健羽, 沈刚   

  1. 上海泰康拜博口腔医院,上海 200001
  • 收稿日期:2021-11-18 修回日期:2022-01-10 出版日期:2022-04-25 发布日期:2022-05-16
  • 通讯作者: 沈刚,E-mail:shengang03@bybo.com.cn
  • 作者简介:徐子卿（1987-）,男,博士,主治医师,E-mail:orthoxu@qq.com

Establishment of a 3-dimentional finite element system simulating En masse retraction implemented by customized lingual appliances

XU Zi-qing, WANG Te, JIANG Jian-yu, SHEN Gang   

  1. Shanghai Tai Kang ByBo Dental Hospital. Shanghai 200001, China
  • Received:2021-11-18 Revised:2022-01-10 Online:2022-04-25 Published:2022-05-16

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摘要： 目的： 以牙槽性前突患者为研究对象,应用逆向工程软件构建个性化舌侧正畸滑动内收阶段上颌牙列的三维有限元模型,运用有限元分析软件进行不同滑动内收加力模式的模拟,探讨前牙转矩控制和牙弓形态的变化,为临床舌侧正畸提供理论依据和数据基础。方法： 选择牙槽性前突成年女性患者1例,采用eBrace个性化舌侧技术拔牙矫正,获取该患者滑动内收前颌面部锥形束CT（CBCT）数据,使用Mimics 15.0软件进行三维重建。采用Pro/E 4.0软件对三维模型进行修整,生成牙周膜、舌侧托槽、舌侧弓丝、种植钉及其他附件的模拟结构。使用Geomagic Studio 13.0软件将模型整合,建立复合结构三维实体模型。将实体模型导入Ansys Workbench 15.0软件平台进行网格划分,设定材料属性和接触性质,完成三维有限元模型的构建。结果： 三维有限元系统包括4组模型,即①不同内收加力模式的力学模型—种植钉分别放置于第二前磨牙与第一磨牙之间,以及第一、第二磨牙之间; ②不同弓丝尺寸的力学模型—分别建立0.016英寸×0.022英寸、0.017英寸×0.022英寸、0.016英寸×0.024英寸及0.017英寸×0.025英寸弓丝的加力模拟;③不同弓丝截面形态的加力模型—分别建立扁平弓及带状弓2种弓丝形态的加力模拟;④不同转矩预置的力学模型—在右侧上颌中切牙舌侧托槽中分别预置0°、4°、7°、10°及13°的转矩量,建立不同转矩状态下的加力模拟。结论： 根据牙槽性前突患者的CBCT数据,建立了4组个性化舌侧正畸滑动内收阶段的三维有限元模型,用于分析不同内收模式、不同补偿设计时的力学差异。所建立的模型几何相似性强,能模拟内收阶段前牙转矩控制和牙弓形态的变化趋势。

关键词: 个性化舌侧技术, 有限元建模, 加力模型, 滑动内收

Abstract: PURPOSE: This study was designed to establish a 3-dimentional finite element system to simulate the clinical scenario where labial segment was retracted with sliding mechanism in extraction cases treated by individualized lingual orthodontics. METHODS: A typical clinical case was selected. The subject was diagnosed with Class I malocclusion with alveolar protrusion and treated with extraction of 4 first premolars. The subject was under the treatment stage of frontal retraction by eBrace system, an individualized lingual appliance. The subject was also taken cone-beam CT (CBCT) based on which digital 3D reconstruction of dentition structures was formed with Mimics software. With the aid of software platform Pro/E 4.0, the important anatomical structures were defined, and relevant lingual devices, including lingual brackets, arch-wires, mini-screws and other accessories were formed. With the aids of software platform Geomagic Studio 13.0, the 3-dimentional structural mode, featuring maxillary alveolar, upper dentition, periodontal ligament, miniscrew and lingual applicance, were constructed. With the assistance of Ansys Workbench 15.0, 3D model for finite element system was finalised by conducting model meshing and defining the mechanical properties and the interface relations of the selected materials. RESULTS: Based on the digital information drawn from CBCT image, a 3-dimentional finite element system was successfully created, featuring all the elements mimicking the clinical scenario for En masse retraction. This system enabled an insight study on the effects of various retraction modes controlling the incisal torque and maintaining the dental arch integrity. CONCLUSIONS: The creation of a finite element system in this study is based on the digital data from the CBCT image of a real patient diagnosed with prognathic malocclusion and treated by lingual appliance. The clinical scenario of labial segment retraction via sliding mechanism is simulated in this finite element model.

Key words: Individualized lingual orthodontics, Finite element system, Force loading model, En masse retraction

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