Realistic kinetic loading of the jaw system during single chewing cycles: a finite element study
Realistic kinetic loading of the jaw system during single chewing cycles: a finite element study
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DOI：
10.1111/joor.12501
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发表时间：
2017-05-01
影响因子：
2.9
通讯作者：
Schindler, H. J.
中科院分区：
文献类型：
--
作者：
Choy, S. E. Martinez;Lenz, J.;Schindler, H. J.
虽然在咀嚼过程中拮抗牙齿之间的短程动力学相互作用的知识是至关重要的，以确保无干扰的固定牙重建，很少有信息可用。在这项研究中，力和位移的牙齿在动力磨牙咬合模拟咀嚼周期的动力冲程进行了研究，通过使用有限元模型，包括所有的基本组成部分的人类咀嚼系统，包括一个弹性的食物团。我们假设，该模型可以近似的负载特性的牙列在以前的实验研究中发现。该模拟是瞬态分析，也就是说，它考虑了钳口的动态行为。特别是，牙齿和关节上的反作用力来自接触，而不是节点力或约束。为了计算牙齿的位移，牙周膜（PDL）建模使用奥格登材料模型校准的基础上，在以前的实验中获得的结果。在动力冲程的初始保持阶段期间，咬合力与臼齿的根部对齐，直到大丸发生实质性变形。力使磨牙在颊舌和近远中方向倾斜，但随着侵入力的增加，牙齿恢复到其初始构型。用于PDL的Ogden材料模型能够准确预测实验测试中观察到的位移。总之，综合动力学有限元模型再现了以前的实验研究的运动学和负载特性。
Although knowledge of short-range kinetic interactions between antagonistic teeth during mastication is of essential importance for ensuring interference-free fixed dental reconstructions, little information is available. In this study, the forces on and displacements of the teeth during kinetic molar biting simulating the power stroke of a chewing cycle were investigated by use of a finite-element model that included all the essential components of the human masticatory system, including an elastic food bolus. We hypothesised that the model can approximate the loading characteristics of the dentition found in previous experimental studies. The simulation was a transient analysis, that is, it considered the dynamic behaviour of the jaw. In particular, the reaction forces on the teeth and joints arose from contact, rather than nodal forces or constraints. To compute displacements of the teeth, the periodontal ligament (PDL) was modelled by use of an Ogden material model calibrated on the basis of results obtained in previous experiments. During the initial holding phase of the power stroke, bite forces were aligned with the roots of the molars until substantial deformation of the bolus occurred. The forces tilted the molars in the bucco-lingual and mesio-distal directions, but as the intrusive force increased the teeth returned to their initial configuration. The Ogden material model used for the PDL enabled accurate prediction of the displacements observed in experimental tests. In conclusion, the comprehensive kinetic finite element model reproduced the kinematic and loading characteristics of previous experimental investigations.