Biomechanical effects of clear aligner with different shape design at extraction space area during anterior teeth retraction

IF 2.4 3区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

Orthodontics & Craniofacial Research Pub Date : 2024-04-23 DOI:10.1111/ocr.12795

Bochun Mao, Yajing Tian, Yujia Xiao, Jiayi Liu, Dawei Liu, Jing Li, Yanheng Zhou

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引用次数: 0

Abstract

Objective

This study aimed to investigate the biomechanical effects of clear aligner (CA) with different shape designs at extraction space (CAES) area during space closing.

Materials and Methods

A finite-element method (FEM) model of mandibular dentition, periodontal ligaments, attachments, and corresponding CA was established. The connecting rod design of CAES was modelled for the control group. Eight test groups with different heights of CAES from −4 mm to +4 mm were designed. Tooth displacement tendencies were calculated. The maximum principal stress in PDLs, teeth, and CAs was analysed. Both global coordinate system and local coordinate system were also used to evaluate individual tooth movements.

Results

Across all groups, stresses concentrated on the lingual outer surface of CAESs. For the lowered CAES groups, both the stress value and the stress distribution area at CAESs were increased. The lowered CAES groups showed reduced movement in anterior teeth and less tipping tendency of the canines.

Conclusion

The shape of CAES has a biomechanical impact on anterior teeth movement and should be considered in aligner design. The results suggest that increasing the height of CAES can enhance anterior teeth retraction, while lowered CAES may facilitate controlled root movement. Changes in the shape of CAES represent a potential direction for biomechanical improvement of clear aligner in extraction cases and are worth exploring.

查看原文本刊更多论文

不同形状设计的透明矫治器在前牙牵引过程中对拔牙间隙区域的生物力学影响。

材料和方法建立了下颌牙体、牙周韧带、附着体和相应CA的有限元法（FEM）模型。为对照组建立了 CAES 的连杆设计模型。设计了八组不同高度的 CAES（-4 毫米至 +4 毫米）。计算了牙齿的位移趋势。分析了 PDL、牙齿和 CA 的最大主应力。结果所有组的应力都集中在 CAES 的舌外侧表面。在降低 CAES 的组别中，CAES 的应力值和应力分布面积都有所增加。结论 CAES 的形状对前牙的移动有生物力学影响，在设计矫治器时应加以考虑。结果表明，增加CAES的高度可以增强前牙的回缩，而降低CAES的高度可以促进牙根的可控移动。在拔牙病例中，改变CAES的形状是改善透明矫治器生物力学的一个潜在方向，值得探讨。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Orthodontics & Craniofacial Research 医学-牙科与口腔外科

CiteScore

5.30

自引率

3.20%

发文量

审稿时长

>12 weeks

期刊介绍： Orthodontics & Craniofacial Research - Genes, Growth and Development is published to serve its readers as an international forum for the presentation and critical discussion of issues pertinent to the advancement of the specialty of orthodontics and the evidence-based knowledge of craniofacial growth and development. This forum is based on scientifically supported information, but also includes minority and conflicting opinions. The objective of the journal is to facilitate effective communication between the research community and practicing clinicians. Original papers of high scientific quality that report the findings of clinical trials, clinical epidemiology, and novel therapeutic or diagnostic approaches are appropriate submissions. Similarly, we welcome papers in genetics, developmental biology, syndromology, surgery, speech and hearing, and other biomedical disciplines related to clinical orthodontics and normal and abnormal craniofacial growth and development. In addition to original and basic research, the journal publishes concise reviews, case reports of substantial value, invited essays, letters, and announcements. The journal is published quarterly. The review of submitted papers will be coordinated by the editor and members of the editorial board. It is policy to review manuscripts within 3 to 4 weeks of receipt and to publish within 3 to 6 months of acceptance.