Three-dimensional finite element analysis of the mechanical effects of different heights of micro-implant anchorage on maxil-lary anterior teeth retraction in clear aligner treatment
10.13591/j.cnki.kqyx.2025.10.004
- VernacularTitle:无托槽隐形矫治中微种植体支抗高度对上颌前牙内收力学影响的三维有限元分析
- Author:
Chi ZHANG
1
;
Leheng ZHANG
;
Youran XU
;
Fengyang ZHAI
;
Peiyu ZHANG
;
Liying PIAO
;
Minxuan HAN
;
Shu LOU
Author Information
1. 南京医科大学附属口腔医院正畸科,江苏南京(210029);口腔疾病研究与防治国家级重点实验室培育建设点,江苏南京(210029);江苏省口腔转化医学工程研究中心,江苏南京(210029)
- Publication Type:Journal Article
- Keywords:
three-dimensional finite element analysis;
micro-implant anchorage;
clear aligner
- From:
STOMATOLOGY
2025;45(10):742-748,800
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the mechanical effects of various height combinations of canine long-arm hooks and micro-im-plant anchorage on the retraction of maxillary anterior teeth in clear aligner treatment.It focuses on analyzing the stress distribution within the periodontal ligament and the movement tendencies of the anterior teeth,providing scientific evidence for optimizing orthodon-tic treatment strategies.Methods Three-dimensional finite element models were developed using CBCT scan data of patients and soft-ware including Mimics,Geomagic Studio,and Hypermesh.The models incorporated 16 different configurations of canine long-arm hooks(4,6,8,10 mm)and micro-implant anchorage(6,8,10,12 mm).Elastic traction forces of 3/16,3.5 oz were applied to these models.Simulations assessed how these variables influenced periodontal ligament stress distribution and the movement patterns of the maxillary anterior teeth.Results Stress during anterior teeth retraction was predominantly concentrated in the cervical and apex re-gions of the periodontal ligament,where it interfaced with the alveolar bone,indicating significant local concentration.Increasing the height of micro-implant anchorage and traction hooks markedly reduced positional changes in both the crown and apex.Specifically,when hooks exceeded 8 mm and anchorage heights surpassed 10 mm,canine movement became more uniform,preventing extrusion and minimizing the deepening of the overbite.Additionally,combinations of high traction hooks and high micro-implant anchorage promoted more uniform tooth movement,reducing unnecessary tipping and rotation.Conclusion In the retraction of maxillary anterior teeth with clear aligners,using high-position micro-implant anchorage and high-position traction hooks significantly enhances torque control of anterior teeth and effectively prevents deepening of the overbite.
