Function of digastric muscle as regards the controllability of temporomandibular joint loading : A static 2-D analysis using a rigid-body spring model
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概要
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In order to clarify the control mechanisms of temporomandibular joint (TMJ) loading during a static bilateral bite, we have been numerically analyzing the controllability of TMJ loading through coordinative activities of the masticatory muscles, employing a static two-dimensional (2-D) jaw model, which consists of a rigid-body model of the jaws with a rigid-body spring model of the TMJ and masticatory muscles, such as the masseter, the anterior portion of the temporalis and the lateral pterygoid. These muscles were all simulated as force vectors applied to the mandible. Bite force was applied to a single point on the lower first molar, and its direction was set so as to be perpendicular to the occlusal plane. Numerical simulations verified that TMJ loading can be minimized by simply adjusting the activities of the masseter and temporalis muscles. The direction of the minimum TMJ-loading vector nearly agrees with the direction from the intermediate zone of the ariticular disk to the condylar center. Our previous model, however, neglected the digastric muscle, even though it functions during a bilateral bite. This paper then attempts to analyze the effects of the digastric force on the afore-mentioned controllability of TMJ loading, employing an updated jaw-model that includes the digastric muscle. Through numerical experiments, the activation of this muscle was verified to slightly increase the minimum TMJ-loading and to be completely independent of the direction of the minimum TMJ-loading vector. Thus, the digastric muscle is believed to play no significant role in the control of TMJ loading, and its activation had no discernible effect on our previous findings, with respect to the minimization of TMJ loading.
- 日本顎口腔機能学会の論文
- 2002-11-30
著者
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NAKAMURA Yasuo
Department of Biocybernetics, Faculty of Engineering, Niigata University
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Hayashi Toyohiko
Department Of Biocybernetics Faculty Of Engineering Niigata University
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Itoh Ken-ichi
Department Of Electrical And Computer Engineering Faculty Of Technology Kanazawa University
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Itoh Ken-ichi
Department Of Information And Electronics Engineering Faculty Of Engineering Niigata Institute Of Te
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Abe Makoto
Graduate School of Science and Technology, Niigata University
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Abe Makoto
Graduate School Of Science And Technology Niigata University
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Nakamura Yasuo
Department Of Biocybernetics Faculty Of Engineering Niigata University
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Nakamura Yasuo
Niigata Univ.
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ABE Makoto
Graduate School of Engineering, Tohoku University
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