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Biomechanical influence of anchorages on orthodontic space closing mechanics by sliding method.
Medical & Biological Engineering & Computing ( IF 3.2 ) Pub Date : 2020-03-11 , DOI: 10.1007/s11517-020-02149-1
Zhan Liu 1 , Tinghui Sun 1 , Yubo Fan 2, 3, 4
Affiliation  

This study aims to analyse the stress distributions and initial displacements of teeth during the space closing stage through a three-dimensional finite element method. Computed tomography images of a patient were used to reconstruct the detailed teeth and alveolar bone, and brackets with stainless steel archwire were modelled according to the orthodontic prescriptions. The second premolars and first molars were chosen as the anchorages in the model 6-force, with buccal tubes attached to the second molars in the model 6-force-7, and the second molars as additional anchorages in the model 7-force. The results indicated that a movement of lingual lateral inclination occurred on the incisors during the retraction, and the frictional force between the teeth and the archwire significantly reduced the stress on the teeth and periodontal structures. Graphical abstract Malocclusion is one of the most common issue in dentistry with high prevalence and orthodontic treatment need. The extraction of first premolar teeth was normally needed at the beginning of the treatment. And the straight wire appliance together with the sliding mechanics was used for space closure at the end of the treatment. However, side effects like root resorption also found after the surgery. Biomechanically, the stress distributions and initial displacements of teeth during space closing stage might be a crucial factor contributed to those undesirable side effects. And different selections of anchorages might alter the biomechanical environment during the treatment. Thus, the purpose of the current study was to analyse the stress distributions and initial displacements, with the different anchorage selections, of teeth during space closing stage through 3D finite element method.

中文翻译:

滑动方法对锚固对正畸空间闭合力学的生物力学影响。

本研究旨在通过三维有限元方法分析空间闭合阶段牙齿的应力分布和初始位移。使用计算机断层扫描图像来重建详细的牙齿和牙槽骨,并根据正畸处方对带有不锈钢弓丝的支架进行建模。选择第二前磨牙和第一磨牙作为模型6力的锚固,颊管连接到模型6力7的第二磨牙,第二磨牙作为模型7力的附加锚固。结果表明,在回缩过程中,门牙发生了舌侧向倾斜运动,牙齿与弓丝之间的摩擦力显着降低了牙齿和牙周结构上的应力。图形化抽象咬合不良是牙科中最普遍的问题之一,具有很高的患病率和正畸治疗需求。在治疗开始时通常需要拔除第一颗前磨牙。在治疗结束时,将直线器械与滑动机构一起用于空间封闭。但是,手术后也发现了诸如根吸收的副作用。从生物力学上讲,在空间闭合阶段牙齿的应力分布和初始位移可能是导致这些不良副作用的关键因素。在治疗过程中,不同的锚固选择可能会改变生物力学环境。因此,本研究的目的是分析不同锚固选择的应力分布和初始位移,
更新日期:2020-03-11
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