Estimation Of Masticatory Forces For
Patient-specific Analysis Of The Human Mandible
Author(s)
M. Koseki, N. Inou & K.Maki
Abstract
This paper proposes an estimationmethod of themasticatory forces using an objective
function composed of three criteria: efficiency of muscular activities, moment
balance between muscular and biting forces, and reaction forces at condyles. The
method is applied to a patient whose jaw has a severe deformity, and the influence
of the criteria is examined. The muscular forces of the numerical result with the
consideration of all three criteria well agree to the analysis of EMG signals. Individual
stress analysis under the estimated mechanical condition is also performed.
There is no stress concentration and little difference in stress distribution on both
left and right sides in spite of the asymmetrical mandibular shape and masticatory
condition. The numerical result suggests mechanical adaptation of mandible by
the masticatory forces.
Keywords: muscular force, masticatory system, estimation method, finite element
analysis, patient-specific model, objective function.
1 Introduction
Patient-specific simulation with FEM is a significant technique for examination of
biomechanical characteristics of bones. There are three important procedures to
obtain reliable results in the FEM analysis:
• Accurate modeling of the complex bony shape.
• Proper setting of the material property.
• Proper setting of the boundary conditions.
In order to perform the first procedure, we proposed patient-specific modeling
method based on X-ray CT images [1]. For the second procedure, we assigned
Young’s moduli for each element of the model referring to the CT value [2].
Keywords
muscular force, masticatory system, estimation method, finite element
analysis, patient-specific model, objective function.
Related Book
Other papers in this volume
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