Constructing Detailed Subject-Specific Models of the Human Masseter

We investigate the structural details of the human masseter and their contribution to force-transmission necessary for mastication through a computational modelling study. We compare two subject-specific models, constructed using data acquired by a dissection and digitization procedure on cadaveric specimens. Despite architectural differences between the two masseters, we find that in both instances it is necessary to capture the combination of the multipennate nature of the muscle fibres, as well as the increased aponeurosis stiffness, in order to reproduce adequate clenching forces. We also demonstrate the feasibility of deformably registering these architectural templates to target muscle surfaces in order to create new subject-specific models.

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