Biomechanical analysis of the effect of Class II traction configurations and aligner overtreatment on molar distalization: a finite-element study.

IF 2.8 3区 医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE European journal of orthodontics Pub Date : 2024-12-01 DOI:10.1093/ejo/cjae055
Jialun Li, Yi Yang, Ziwei Tang, Qi Fan, Omar M Ghaleb, Xian He, Wenli Lai, Hu Long
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Abstract

Objective: This study aimed to evaluate the biomechanical effects of aligner overtreatment on molar distalization using clear aligners.

Methods: Various models were created and integrated into finite-element software. Six distinct study models were devised for analysis. The first three models examined second molar distalization with different configurations of attachments, i.e. no attachment, horizontal or vertical attachment on the second molar. For the fourth and fifth models, Class II elastic traction, either implemented via a precision cut or button on canines, was applied. Lastly, aligner overtreatment with varying degrees of root distal tipping (0°, 2°, 4°, 6°, 8°, 10°, and 12°) for the second molar was designed in the last study model.

Results: Distalization of the second molar produced buccal tipping, distal tipping and intrusion of the second molar, and labial proclination and intrusion of the central incisor. These displacement tendencies were enhanced by adding attachments on the second molar, especially the vertical attachment. Class II elastic tractions enhanced molar distalization and diminish anchorage loss, with the precision-cut configuration being biomechanically superior to the button design. Aligner overtreatment produced bodily molar distalization and mitigated adverse biomechanical effects on anchorage teeth.

Limitations: The study's limitations include the use of finite-element models, which may not fully represent real clinical scenarios, and the lack of consideration for individual patient variability.

Conclusions: We suggest that Class II elastic traction via the precision-cut configuration and the design of vertical attachment on the second molar be applied for molar distalization. Appropriate aligner overtreatment helps achieve bodily molar distalization and minimizes adverse biomechanical effects on anchorage teeth.

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二类牵引配置和矫治器过度治疗对臼齿远化影响的生物力学分析:有限元研究。
研究目的本研究旨在评估矫治器过度治疗对使用透明矫治器的臼齿远化的生物力学影响:方法:创建各种模型并将其整合到有限元软件中。设计了六个不同的研究模型进行分析。前三个模型研究了不同附着体配置下的第二磨牙远化情况,即第二磨牙上无附着体、水平或垂直附着体。在第四和第五个模型中,应用了第二类弹性牵引,通过精确切割或在犬齿上使用按钮来实现。最后,在最后一个研究模型中,对第二磨牙设计了不同程度的牙根远端倾斜(0°、2°、4°、6°、8°、10°和12°)的矫治器过度治疗:结果:第二磨牙的远端化产生了第二磨牙的颊侧倾斜、远端倾斜和内陷,以及中切牙的唇侧倾斜和内陷。在第二磨牙上增加附着体,尤其是垂直附着体,会增强这些移位趋势。II类弹性牵引增强了臼齿的远端化,减少了锚固力的损失,精密切割结构在生物力学上优于按钮设计。矫治器过度治疗会导致磨牙远化,并减轻对锚定牙的不利生物力学影响:该研究的局限性包括使用了有限元模型,该模型可能无法完全代表真实的临床情况,而且没有考虑患者的个体差异:我们建议通过精确切割配置和第二磨牙垂直附着设计进行第二类弹性牵引,以实现磨牙远端化。适当的矫治器过度治疗有助于实现磨牙体远端矫治,并将对锚定牙的不利生物力学影响降至最低。
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来源期刊
European journal of orthodontics
European journal of orthodontics 医学-牙科与口腔外科
CiteScore
5.50
自引率
7.70%
发文量
71
审稿时长
4-8 weeks
期刊介绍: The European Journal of Orthodontics publishes papers of excellence on all aspects of orthodontics including craniofacial development and growth. The emphasis of the journal is on full research papers. Succinct and carefully prepared papers are favoured in terms of impact as well as readability.
期刊最新文献
Comprehensive clinical evaluation of indirect and direct bonding techniques in orthodontic treatment: a single-centre, open-label, quasi-randomized controlled clinical trial. Palatal canine impaction is associated with craniofacial shape in humans. Spontaneous space closure after extraction of permanent first molars in children and adolescents: a systematic review and meta-analysis. Biomechanical analysis of the effect of Class II traction configurations and aligner overtreatment on molar distalization: a finite-element study. Correction to: Influence of vitamin D in orthodontic tooth movement-a systematic review and meta-analysis of randomized controlled trials in humans.
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