Investigation on Masticatory Muscular Functionality Following Oral Reconstruction – An Inverse Identification Approach
Zheng, K; Liao, Z; Yoda, N; et al.Fang, J; Chen, J; Zhang, Z; Zhong, J; Peck, C; Sasaki, K; Swain, MV; Li, Q
Date: 10 April 2019
Article
Journal
Journal of Biomechanics
Publisher
Elsevier
Publisher DOI
Abstract
The human masticatory system has received significant attention in the areas of
biomechanics due to its sophisticated co-activation of a group of masticatory muscles which
contribute to the fundamental oral functions. However, determination of each muscular force
remains fairly challenging in vivo; the conventional data available ...
The human masticatory system has received significant attention in the areas of
biomechanics due to its sophisticated co-activation of a group of masticatory muscles which
contribute to the fundamental oral functions. However, determination of each muscular force
remains fairly challenging in vivo; the conventional data available may be inapplicable to
patients who experience major oral interventions such as maxillofacial reconstruction, in which
the resultant unsymmetrical anatomical structure invokes a more complex stomatognathic
functioning system. Therefore, this study aimed to (1) establish an inverse identification
procedure by incorporating the sequential Kriging optimization (SKO) algorithm, coupled with
the patient-specific finite element analysis (FEA) in silico and occlusal force measurements at
different time points over a course of rehabilitation in vivo; and (2) to evaluate muscular
functionality for a patient with mandibular reconstruction using a fibula free flap (FFF)
procedure. The results from this study proved the hypothesis that the proposed method is of
certain statistical advantage of utilizing occlusal force measurements, compared to the
traditionally adopted optimality criteria approaches that are basically driven by minimizing the
energy consumption of muscle systems engaged. Therefore, it is speculated that mastication may
not be optimally controlled, in particular for maxillofacially reconstructed patients. For the
abnormal muscular system in the patient with orofacial reconstruction, the study shows that in
general, the magnitude of muscle forces fluctuates over the 28-month rehabilitation period
regardless of the decreasing trend of the maximum muscular capacity, which implies that the
reduction of the masticatory muscle activities on the resection side might lead to nonphysiological oral biomechanical responses, which can change the muscular activities for
stabilizing the reconstructed mandible.
Engineering
Faculty of Environment, Science and Economy
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