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首页> 外文期刊>Journal of Biomechanics >The effects of the periodontal ligament on mandibular stiffness: a study combining finite element analysis and geometric morphometrics.
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The effects of the periodontal ligament on mandibular stiffness: a study combining finite element analysis and geometric morphometrics.

机译：牙周膜对下颌僵硬的影响：结合有限元分析和几何形态学的研究。

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摘要

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.
机译：人们普遍认为牙周膜（PDL）在将咬合力从牙齿传递到牙槽骨中起着至关重要的作用。使用有限元分析（FEA）进行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FE模型中是否包含PDL以及如何包含PDL的影响。但是，当对颅骨和下颌骨中的应力和应变的总体分布感兴趣时，FE模型通常不包括PDL，尽管对其影响如何的结果知之甚少。在这里，我们使用几何形态计量学的新型应用，研究了将PDL表示为具有各向同性均质特性的固体材料层在人类下颌骨的FE模型中的作用。结果表明，PDL的建模不仅影响咬合齿周围的牙槽骨的变形，从而影响其应变幅度，而且整个下颌骨在载荷作用下的变形也不同。结果，当包含PDL时，下颌体的应变显着增加，而在咬合牙下方的骨骼中的应变降低了。这些结果表明PDL在有限元研究中的重要性。因此，我们建议将PDL包含在咀嚼装置的FE模型中，并进行测试以评估结果对PDL材料的杨氏模量变化的敏感性。

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