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JRM Vol.10 No.6 pp. 499-504
doi: 10.20965/jrm.1998.p0499
(1998)

Paper:

Development of 2-D Jaw Movement Simulator (JSN/S1)

Shin-ichi Nakajima*, Toyohiko Hayashi** and Hiroshi Kobayashi***

*Department of Mechanical and Control Engineering, Niigata Institute of Technology, 1719 Fujihashi, Kashiwazaki, Niigata 945-1195, Japan

**Department of Biocybernetics, Faculty of Engineering, Niigata University, 2-8050 Ikarashi, Niigata 950-2181, Japan

***Department of Removable Prosthodontics, School of Dentistry, Niigata University, 2-5274 Gakko-cho, Niigata 951-8514, Japan

Received:
May 1, 1998
Accepted:
August 6, 1998
Published:
December 20, 1998
Keywords:
Jaw-movement simulator, Mastication, Muscle actuator, Neural networks
Abstract

Human mastication is performed by coordinated activities of several jaw muscles. To clarify functions of these muscles, we developed a jaw movement simulator (JSN/Sl) consisting of a 2 degrees of freedom (2DOF) mechanism and five muscle actuators able to reproduce jaw movements on a sagittal plane. The actuator is a cable-tendon driven by a DC servomotor controlled by a compliance control scheme to obtain viscoelastic muscle characteristics. To simulate life-like clenching, we controlled occlusal position and force by incorporating position and force sensors, using neural network learning control. Occlusal force successfully converged to a desired value through learning. Tension patterns of muscle actuators during clenching well coincided with human jaw activities.

Cite this article as:
Shin-ichi Nakajima, Toyohiko Hayashi, and Hiroshi Kobayashi, “Development of 2-D Jaw Movement Simulator (JSN/S1),” J. Robot. Mechatron., Vol.10, No.6, pp. 499-504, 1998.
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