Dynamic occlusal loading during mastication is clinically relevant in the design and functional assessment of dental restorations and removable dentures, and in evaluating temporomandibular joint dysfunction. The aim of this study was to develop a modelling framework to evaluate subject-specific dynamic occlusal loading during chewing and biting over the entire dental arch. Measurements of jaw motion were performed on one healthy male adult using low-profile electromagnetic field sensors attached to the teeth, and occlusal anatomy quantified using an intra-oral scanner. During testing, the subject chewed and maximally compressed a piece of rubber between both second molars, first molars, premolars and their central incisors. The occlusal anatomy, rubber geometry and experimentally measured rubber material properties were combined in a finite element model. The measured mandibular motion was used to kinematically drive model simulations of chewing and biting of the rubber sample. Three-dimensional dynamic bite forces and contact pressures across the occlusal surfaces were then calculated. Both chewing and biting on the first molars produced the highest bite forces across the dental arch, and a large amount of anterior shear force was produced at the incisors and the second molars. During chewing, the initial tooth-rubber contact evolved from the buccal sides of the molars to the lingual sides at full mouth closure. Low-profile electromagnetic field sensors were shown to provide a clinically relevant measure of jaw kinematics with sufficient accuracy to drive finite element models of occlusal loading during chewing and biting. The modelling framework presented provides a basis for calculation of physiological, dynamic occlusal loading across the dental arch.

咀嚼过程中的动态咬合负荷在牙科修复体和活动义齿的设计和功能评估以及评估颞下颌关节功能障碍方面具有临床意义。本研究的目的是开发一个建模框架，以评估在整个牙弓上咀嚼和咬合期间特定主题的动态咬合负荷。使用附着在牙齿上的低剖面电磁场传感器对一名健康男性成人进行下颌运动测量，并使用口腔内扫描仪量化咬合解剖结构。在测试过程中，受试者咀嚼并最大限度地压缩第二磨牙、第一磨牙、前磨牙及其中切牙之间的一块橡胶。咬合解剖学，橡胶几何形状和实验测量的橡胶材料特性结合在一个有限元模型中。测量的下颌运动用于动态驱动橡胶样品咀嚼和咬合的模型模拟。然后计算咬合面的三维动态咬合力和接触压力。第一磨牙的咀嚼和咬合在整个牙弓上产生的咬合力最高，切牙和第二磨牙产生了大量的前切力。在咀嚼过程中，牙齿与橡胶的最初接触从臼齿的颊侧发展到全口闭合时的舌侧。低剖面电磁场传感器被证明可以提供临床相关的颌运动学测量，其精度足以驱动咀嚼和咬合过程中咬合载荷的有限元模型。所呈现的建模框架为计算整个牙弓的生理、动态咬合载荷提供了基础。