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research-article

Experimental and numerical characterization of the mechanical masseter muscle response during mastication

[+] Author and Article Information
Johannes Weickenmeier

Department of Mechanical Engineering, Stanford University, Stanford 94305, USA; Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
weickenj@stanford.edu

Mahmood Jabareen

Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa, Israel
cvjmah@tx.technion.ac.il

Benjamin J.D. Le Révérend

Nestlé Research Center, Rte du Jorat 57, CH-1000 Lausanne 26, Switzerland
Benjamin.LeReverend@rdls.nestle.com

Marco Ramaioli

Department of Chemical and Process Engineering, University of Surrey, Guildford, UK
m.ramaioli@surrey.ac.uk

Edoardo Mazza

Swiss Federal Laboratories for Materials Science and Technology - EMPA, Duebendorf, Switzerland; Department of Mechanical and Process Engineering, ETH Zurich, Zurich, Switzerland
mazza@imes.mavt.ethz.ch

1Corresponding author.

ASME doi:10.1115/1.4037592 History: Received April 08, 2017; Revised July 28, 2017

Abstract

Predictive simulations of the mastication system would significantly improve our understanding of temporomandibular joint disorders and the planning of cranio-maxillofacial surgery procedures. Respective computational models must be validated by experimental data from in-vivo characterization of the mastication system's mechanical response. The present work introduces a combined experimental and numerical procedure for the validation of a computer model of the masseter muscle during biting. The proposed experimental setup enables simultaneous bite force measurements and ultrasound-based visualization of masseter deformation for the direct comparison with the numerically predicted masseter response. Differences between molar and incisor biting are investigated; and muscle deformation is recorded for three different bite forces in order to capture the effect of increasing muscle fiber recruitment. The three-dimensional muscle deformation at each bite position and force-level is approximatively reconstructed from ultrasound measurements in five distinct cross-sectional areas (four horizontal and one vertical cross section). The experimental work is accompanied by numerical simulations to validate the predictive capabilities of a constitutive muscle model previously formulated. An anatomy-based, fully three-dimensional model of the masseter muscle is created from magnetic resonance images of the same subject. The direct comparison of experimental and numerical results revealed good agreement for maximum bite forces and masseter deformations in both biting positions. The present work therefore presents a feasible in-vivo measurements system to validate numerically predicted masseter muscle contractions during mastication.

Copyright (c) 2017 by ASME
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