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首页> 外文期刊>Orthodontics & craniofacial research >Strains in periodontal ligament and alveolar bone associated with orthodontic tooth movement analyzed by finite element
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Strains in periodontal ligament and alveolar bone associated with orthodontic tooth movement analyzed by finite element

机译：牙周韧带和牙槽骨中与正畸牙移动有关的应变的有限元分析

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Introduction-Orthodontic tooth movement (OTM) is achieved by applying an orthodontic force system to the brackets. The (re)modeling processes of the alveolar support structures are triggered by alterations in the stress ? strain distribution in the periodontium. According to the classical OTM theories, symmetric zones of compression and tension are present in the periodontium, but these do not consider the complex mechanical properties of the PDL, the alveolar structures' morphology, and the magnitude of the force applied. Materials and Methods - Human jaws segments obtained from autopsy were microCT-scanned and sample-specific finite element (FE) models were generated. The material behavior of the PDL was considered to be nonlinear and non-symmetric and the alveolar bone was modeled according to its actual morphology. A series of FEanalyzes investigated the influence of the moment-to-force ratio, force magnitude, and chewing forces on the stress / strain in the alveolar support structures and OTM. Results - Stress / strain findings were dependent on alveolar bone's morphology. BecauseofthenonlinearbehaviorofthePDL,distinctareasof tension,andcompression could not be detected. Secondary load transfer mechanisms were activated and the stress / strain distribution in the periodontium was concealed by occlusal forces. Conclusions - We could not confirm the classical ideas of distinct and symmetrical compressive and tensile areas in the periodontium in relation to different OTM scenarios. Light continuous orthodontics forces will be perceived as intermittent by the periodontium. Because roots and alveolar bone morphology are patientspecific, FE-analysis of orthodontic loading regime should not be based on general models.
机译：简介-正畸牙齿移动（OTM）是通过将正畸力系统应用于托槽来实现的。牙槽支撑结构的（重塑）过程是由应力变化引起的。牙周组织中的应变分布。根据经典的OTM理论，牙周膜中存在对称的压缩和拉伸区域，但这些区域并未考虑PDL的复杂机械性能，牙槽结构的形态以及所施加力的大小。材料和方法-从尸检获得的人类颌骨节段进行microCT扫描，并生成样本特定的有限元（FE）模型。 PDL的材料行为被认为是非线性和非对称的，并且根据其实际形态对牙槽骨进行了建模。一系列有限元分析研究了力矩比，力大小和咀嚼力对牙槽支撑结构和OTM中应力/应变的影响。结果-应力/应变结果取决于牙槽骨的形态。由于PDL的非线性行为，无法检测到张力和压缩率的明显差异。激活了次级载荷传递机制，并通过咬合力隐藏了牙周组织中的应力/应变分布。结论-我们无法确认与不同OTM场景相关的牙周膜中不同且对称的压缩区和拉伸区的经典思想。轻连续的牙齿矫正力会被牙周膜断断续续地感知。由于根和牙槽骨的形态是患者特定的，因此正畸加载方案的有限元分析不应基于一般模型。

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