title: Three-dimensional finite element modelling of muscle forces during mastication.
abstract: This paper presents a three-dimensional finite element model of human mastication. Specifically, an anatomically realistic model of the masseter muscles and associated bones is used to investigate the dynamics of chewing. A motion capture system is used to track the jaw motion of a subject chewing standard foods. The three-dimensional nonlinear deformation of the masseter muscles are calculated via the finite element method, using the jaw motion data as boundary conditions. Motion-driven muscle activation patterns and a transversely isotropic material law, defined in a muscle-fibre coordinate system, are used in the calculations. Time-force relationships are presented and analysed with respect to different tasks during mastication, e.g. opening, closing, and biting, and are also compared to a more traditional one-dimensional model. The results strongly suggest that, due to the complex arrangement of muscle force directions, modelling skeletal muscles as conventional one-dimensional lines of action might introduce a significant source of error.
authors.affiliation: Bioengineering Institute, The University of Auckland, Private Bag 92019, Auckland 1, New Zealand. o.rohrle@auckland.ac.nz
authors.forename: Oliver
authors.initials: O
authors.lastname: Röhrle
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Pullan
mesh_terms: D001696:Biomechanical Phenomena; D020342:Finite Element Analysis; D006801:Humans; D021621:Imaging, Three-Dimensional; D008409:Mastication; D008954:Models, Biological; D009132:Muscles / Q000502:physiology*