口腔医学研究

口腔医学研究 ›› 2023, Vol. 39 ›› Issue (4): 345-349.DOI: 10.13701/j.cnki.kqyxyj.2023.04.012

• 口腔正畸学研究 • 上一篇    下一篇

不同前牙唇倾度及内收压低步距下隐形矫治器作用的比较:三维有限元研究

康芙嘉, 吴聿淼, 刘心雨, 余磊, 李欣怡, 张皓岩, 朱宪春*   

  1. 吉林大学口腔医院正畸科 吉林 长春 130021
  • 收稿日期:2022-10-25 出版日期:2023-04-28 发布日期:2023-04-19
  • 通讯作者: *朱宪春,E-mail:15344310555@163.com
  • 作者简介:康芙嘉(1998~ ),女,内蒙古呼伦贝尔人,硕士在读,医师,研究方向:口腔正畸生物力学。
  • 基金资助:
    吉林省科技厅科技计划项目(编号:20210203064SF)

Comparison of Clear Aligners under Different Anterior Lip Inclines and Adduction Compression Steps: A Three-dimensional Finite Element Study

KANG Fujia, WU Yumiao, LIU Xinyu, YU Lei, LI Xinyi, ZHANG Haoyan, ZHU Xianchun*   

  1. Department of Orthodontics, Stomatological Hospital of Jilin University, Changchun 130021, China
  • Received:2022-10-25 Online:2023-04-28 Published:2023-04-19

PDF (PC)

154

摘要： 目的: 应用有限元分析法探究使用隐形矫治器治疗不同前牙唇倾度以及不同内收压低移动步距下,以分步法内收前牙的牙齿移动特点。方法: 建立使用隐形矫治器分步法内收上颌前牙的有限元模型,依据中切牙及侧切牙的唇倾度分为工况1:U1-SN=105°、工况2:U1-SN=115°、工况3:U1-SN=125°,牙齿移动总步距为0.2 mm,包括沿牙合平面的内收以及沿牙体长轴方向的压低,每组工况以内收量a:0.18 mm、b:0.14 mm、c:0.10 mm进行分组,分析上述不同情况下的牙齿移动特点。结果: 在不同前牙唇倾度以及内收模式下,中切牙、侧切牙均表现为牙冠向舌侧、牙根向唇侧的倾斜移动,第二前磨牙至第二磨牙表现为牙冠向近中的倾斜移动。内收步距越大,前牙冠舌向位移量越大,前牙转矩改变量越大,第二前磨牙至第二磨牙牙冠近中移动量越大。结论: 无托槽隐形矫治器在内收前牙时引起前牙的舌倾及伸长、后牙的近中倾斜,其移动量与内收步距呈正比,预设计的前牙绝对压低量无法抵消由牙齿内收引起的相对伸长量。

关键词: 三维有限元研究, 隐形矫治, 分步内收, 拔牙矫治

Abstract: Objective: To investigate the tooth movement characteristics in the treatment of different anterior tooth lip inclination and different adduction movement step with the clear gligner by finite element analysis. Methods: The finite element model of maxillary anterior adduction with the step method of clear aligner was established. According to the lip inclination of central incisor and lateral incisor, it was divided into working condition 1: U1-SN=105°, working condition 2: U1-SN=115°, and working condition 3: U1-SN=125°. The total step distance of tooth movement was 0.2 mm, including the adduction along the occlusion plane and the compression along the long axis of the tooth body. The internal adduction a: 0.18 mm, b: 0.14 mm, c: 0.10 mm in each group of working conditions were divided into groups to analyze the tooth movement characteristics under the above different conditions. Results: Under different anterior lip inclination and adduction modes, the crown of the central incisor and lateral incisor were inclined to move to the lingual side and the root to the labial side, while the crown of the second premolar to the second molars was inclined to move to the proximal center. The greater the adduction step distance, the greater the lingual displacement of the anterior tooth crown, the greater the torque change of the anterior tooth, and the greater the mesial movement of the crown from the second premolar to the second molar. Conclusion: When the anterior teeth are adducted by the invisible orthodontic device without bracket, the lingual inclination and elongation of the anterior teeth and the mesial inclination of the posterior teeth are caused by the displacement of the anterior teeth, which is proportional to the distance of the adduction step. The pre-designed absolute compression of the anterior teeth cannot offset the relative elongation caused by the tooth adduction.

Key words: three-dimensional finite element study, clear aligner, stepwise adduction, extraction orthodontics