Department of Anthropology, University of Vienna, Austria.
Am J Phys Anthropol. 2012 Jan;147(1):128-34. doi: 10.1002/ajpa.21607. Epub 2011 Sep 27.
Finite element analysis (FEA) is a widespread technique to evaluate the stress/strain distributions in teeth or dental supporting tissues. However, in most studies occlusal forces are usually simplified using a single vector (i.e., point load) either parallel to the long tooth axis or oblique to this axis. In this pilot study we show how lower first molar occlusal information can be used to investigate the stress distribution with 3D FEA in the supporting bone structure. The LM(1) and the LP(2) -LM(1) of a dried modern human skull were scanned by μCT in maximum intercuspation contact. A kinematic analysis of the surface contacts between LM(1) and LP(2) -LM(1) during the power stroke was carried out in the occlusal fingerprint analyzer (OFA) software to visualize contact areas during maximum intercuspation contact. This information was used for setting the occlusal molar loading to evaluate the stress distribution in the supporting bone structure using FEA. The output was compared to that obtained when a point force parallel to the long axis of the tooth was loaded in the occlusal basin. For the point load case, our results indicate that the buccal and lingual cortical plates do not experience notable stresses. However, when the occlusal contact areas are considered, the disto-lingual superior third of the mandible experiences high tensile stresses, while the medio-lingual cortical bone is subjected to high compressive stresses. Developing a more realistic loading scenario leads to better models to understand the relationship between masticatory function and mandibular shape and structures. Am J Phys Anthropol, 2012. © 2011 Wiley Periodicals, Inc.
有限元分析（FEA）是一种广泛用于评估牙齿或牙齿支持组织中应力/应变分布的技术。然而，在大多数研究中，通常使用单个向量（即点载荷）来简化咬合力，该向量要么与长牙轴平行，要么与该轴成斜角。在这项初步研究中，我们展示了如何使用下颌第一磨牙的咬合信息来研究支持骨结构中的三维 FEA 中的应力分布。通过 μCT 在最大咬合接触时扫描了一个现代人类干颅骨的 LM(1)和 LP(2)-LM(1)。在咬合指纹分析器 (OFA) 软件中对 LM(1)和 LP(2)-LM(1)之间的表面接触进行了运动学分析，以在最大咬合接触时可视化接触区域。将这些信息用于设置咬合磨牙加载，以使用 FEA 评估支持骨结构中的应力分布。将输出与在牙齿长轴平行加载点力时获得的输出进行比较。对于点载荷情况，我们的结果表明颊舌皮质板不会经历明显的应力。然而，当考虑咬合接触区域时，下颌骨的远中舌侧上三分之一经历高拉伸应力，而中舌侧皮质骨则承受高压缩应力。开发更现实的加载方案可以得出更好的模型，以了解咀嚼功能与下颌形状和结构之间的关系。美国人类生物学杂志，2012 年。©2011 年 Wiley 期刊公司。
