Computational model of the movement of the human muscles of mastication during opening and closing of the jaw

Abstract

Muscle fibre bundles comprising the four major muscles of mastication in the human being were studied in cadavers. Markers were placed along each muscle fibre bundle by means of serial dissections. The 3D coordinates of each marker were tabulated and imported to Cinema 4D, a software animation program. Origins and insertions of each fibre bundle were also digitized and imported, as were the coordinates of the surface of the skull, the mandible and temporomandibular joint. It was then possible to visualize the movement of all relevant fibre bundles during the passive motions of the mandible. An animated film depicts the positions of all relevant muscle fibres during passive movement of the mandible. The properties of the masseter muscle were documented as a prototype for the eventual study of all the muscles of mastication. One can now proceed to study the inverse problem, namely the forces within each fibre bundle that actively generate mandibular motion. It is hoped that these studies will aid in the management of conditions affecting the temporomandibular joint.

A dynamic model of jaw and hyoid biomechanics during chewing

“…Other limitations included simplified Table 1. tooth guidance and bolus properties, sparse representation of the infra-hyoid muscles, and omission of the tongue. Models of the human jaw are difficult to validate (Hannam, 2005;Leon et al, 2006;Peck and Hannam, 2007;de Zee et al, 2007) since detailed exploration of the muscles and joints is restricted technically and ethically. Like others, our model is at best a working hypothesis strengthened by its performance of tasks with outcomes falling within normal ranges (Hannam, 2005;Peck and Hannam, 2007).…”

“…As jaw biomechanics are difficult to study directly, modelling has become an important investigative tool (van Eijden, 2000;Koolstra, 2002;Hannam, 2005;Koolstra and van Eijden, 1995, 1997, 2005Peck and Hannam, 2007;van Eijden and Koolstra, 1998;Peck et al, 2000Peck et al, , 2002Sanguineti et al, 1998;Hansma et al, 2006;Stavness et al, 2006;Leon et al, 2006;de Zee et al, 2007). Simulations of the chewing cycle are rare however.…”

Determination of three‐dimensional muscle architectures: validation of the DTI‐based fiber tractography method by manual digitization

“…The purpose of this study is to validate the DTI method to reconstruct muscle architecture. An established manual method for reconstruction is the dissection of fiber bundles from a fixated muscle and the subsequent digitization of their position (Loh et al 2003;Leon et al 2006;Kim et al 2007;Rosatelli et al 2008;Fung et al 2009;Mihata et al 2009;Powers et al 2010;Ravichandiran et al 2010). To validate the DTI method, we measured the architecture of one muscle applying (i) the DTI method and (ii) the manual digitization method and compared the results.…”

Skeletal Muscle Fascicle Arrangements Can Be Reconstructed Using a Laplacian Vector Field Simulation

“…[7]–[9], are mostly limited to a few sparse locations in the muscle while only a few studies have conducted a detailed dissection, e.g. [10], [11]. Ultrasound imaging is now frequently used for in vivo measurements because of its fast acquisition time and accessibility, e.g.…”