The effects of the periodontal ligament on mandibular stiffness: a study combining finite element analysis and geometric morphometrics
The effects of the periodontal ligament on mandibular stiffness: a study combining finite element analysis and geometric morphometrics
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DOI：
10.1016/j.jbiomech.2011.01.008
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发表时间：
2011-04-29
影响因子：
2.4
通讯作者：
O'Higgins, P.
中科院分区：
文献类型：
--
作者：
Groening, F.;Fagan, M. J.;O'Higgins, P.
牙周膜在牙合力向牙槽骨的传递中起着重要的作用。使用有限元分析（FEA）的研究有助于更好地理解这一作用，并表明牙槽骨中的应力和应变受PDL是否以及如何包含在FE模型中的影响。然而，当颅骨和下颌骨的应力和应变的整体分布感兴趣时，PDL通常不包括在FE模型中，尽管很少有人知道这如何影响结果。在这里，我们研究的效果表示PDL作为一层固体材料的各向同性均匀属性的有限元模型中的人类下颌骨使用一种新的应用几何形态测量学。结果表明，PDL的建模不仅影响咬合牙齿周围的牙槽骨的变形和应变大小，而且影响整个下颌骨在载荷下的不同变形。结果，当PDL被包括时，下颌体中的应变显著增加，而咬合牙齿下方的骨中的应变减小。这些结果表明PDL在FE研究中的重要性。因此，我们建议，PDL应包括在有限元模型的咀嚼装置，与测试，以评估结果的敏感性变化的PDL材料的杨氏模量。(C)2011爱思唯尔有限公司保留所有权利。
It is generally accepted that the periodontal ligament (PDL) plays a crucial role in transferring occlusal forces from the teeth to the alveolar bone. Studies using finite element analysis (FEA) have helped to better understand this role and show that the stresses and strains in the alveolar bone are influenced by whether and how PDL is included in FE models. However, when the overall distribution of stresses and strains in crania and mandibles are of interest, PDL is often not included in FE models, although little is known about how this affects the results. Here we study the effect of representing PDL as a layer of solid material with isotropic homogeneous properties in an FE model of a human mandible using a novel application of geometric morphometrics. The results show that the modelling of the PDL affects the deformation and thus strain magnitudes not only of the alveolar bone around the biting tooth, but that the whole mandible deforms differently under load. As a result, the strain in the mandibular corpus is significantly increased when PDL is included, while the strain in the bone beneath the biting tooth is reduced. These results indicate the importance of the PDL in FE studies. Thus we recommend that the PDL should be included in FE models of the masticatory apparatus, with tests to assess the sensitivity of the results to changes in the Young's modulus of the PDL material. (C) 2011 Elsevier Ltd. All rights reserved.