Finite Element Analysis of Maxillary Anterior Dentition During Retraction with Varying Level of Bone Support

J. Biswas, Rururaj Pradhan, N. Mondal, Sejuti Ballav, Masud Rana
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Abstract

This study is being carried out to evaluate and compare the stress along the root surfaces of anterior maxillary dentition during retraction in labial and lingual mechanics with varying level of bone support. Eight 3D Finite Element models (FEM) were created with normal periodontium and different levels of alveolar bone loss; four with labial brackets and four with lingual brackets. Sliding mechanics were simulated as en-masse retraction of the anterior dentition. The equivalent stresses along the roots of six anterior maxillary teeth were measured in all the models. Equivalent stresses generated at the root surfaces of central incisors are always higher in labial technique and of canines are always higher in lingual technique, suggesting the increased vulnerability towards root resorption in both cases. Stresses at the root apices of all the teeth are increasing progressively when the bone loss is progressively more than 2mm in labial technique. In labial technique, the stresses at the root apices of all the teeth are increasing progressively when the bone loss is progressively more than 2mm. In Lingual technique, equivalent stresses generated at the root surfaces of canines are more than central and lateral incisors irrespective of the alveolar bone loss, suggesting increased susceptibility to root resorption.
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上颌前牙列在不同骨支持水平下后缩的有限元分析
本研究旨在评估和比较上颌前牙列在不同骨支持水平下,在唇和舌力学中,沿根表面的应力。建立正常牙周组织和不同程度牙槽骨丢失的8个三维有限元模型;四个有唇托四个有舌托。滑动力学模拟为前牙列的大规模内缩。所有模型均测量了6颗上颌前牙沿牙根方向的等效应力。中切牙根面产生的等效应力在唇部技术上总是更高,而犬科在舌部技术上总是更高,这表明在这两种情况下,对根吸收的脆弱性都增加了。在唇部技术中,当骨质流失逐渐超过2mm时,所有牙齿的根尖应力逐渐增加。在唇部技术中,当骨质流失逐渐超过2mm时,所有牙齿的根尖应力逐渐增加。在舌技术中,与牙槽骨丢失无关,犬牙根表面产生的等效应力大于中门牙和侧门牙,这表明牙根吸收的易感性增加。
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