Meyer U, Vollmer D, Homann C, Schuon R, Benthaus S, Végh A, Felszegi E, Joos U, Piffkò J
Klinik für Mund-, Kiefer- und Gesichtschirurgie, Universität Münster, Deutschland.
Mund Kiefer Gesichtschir. 2000 Jan;4(1):14-20. doi: 10.1007/s100060050005.
Biomechanical investigations of the mandible are difficult to perform due to a variety of conditions involved. For the appropriate reconstruction of biomechanical properties, a geometrically correct body model has to be established which fits to complex in vivo conditions. The aim of our study was to evaluate the use of finite-element models (FEM) for the assessment of mandibular deformation under mechanical loading. Explanted human mandibles (n = 5) were investigated by strain gauges to determine the individual strain distribution under mechanical loading. FEM analysis based on a computed tomograph (CT) was performed and the results were matched with the test data. Our study demonstrates only minor interindividual differences in the strain distribution for each load studied. The mechanical response in terms of deformation was found to depend mainly on gross geometrical properties and to a minor extent on the various other variables. At all positions the maximum principal strain was tensile, the minimum principal strain was compressive, and the absolute strain values were correlated with the magnitude of the applied force. CT-based FEM analysis revealed the utility of mathematical models to approximate simulated data our experimental results. Hence, FEM analysis is a non-invasive tool in the prediction of biomechanical behaviour of individual mandibles and therefore may help in trauma reconstruction and treatment planning.
由于涉及多种条件，下颌骨的生物力学研究难以进行。为了恰当地重建生物力学特性，必须建立一个几何形状正确的人体模型，该模型要适合复杂的体内条件。我们研究的目的是评估有限元模型（FEM）在机械加载下评估下颌骨变形的用途。通过应变片对取出的人类下颌骨（n = 5）进行研究，以确定机械加载下的个体应变分布。基于计算机断层扫描（CT）进行了有限元分析，并将结果与测试数据进行了匹配。我们的研究表明，对于所研究的每种载荷，应变分布的个体间差异很小。发现变形方面的力学响应主要取决于总体几何特性，在较小程度上取决于各种其他变量。在所有位置，最大主应变为拉伸应变，最小主应变为压缩应变，并且绝对应变值与施加力的大小相关。基于CT的有限元分析揭示了数学模型用于逼近模拟数据和我们实验结果的效用。因此，有限元分析是预测个体下颌骨生物力学行为的一种非侵入性工具，因此可能有助于创伤重建和治疗规划。
