Journal of Dental Research, Vol 70, 1545-1548, Copyright © 1991 by International & American Associations for Dental Research Online Journals

ARTICLES

The elastic modulus of the temporomandibular joint disc from adult dogs

K. Tanne, E. Tanaka and M. Sakuda
Department of Orthodontics, Osaka University Faculty of Dentistry, Japan.

The present study was designed to measure the elastic properties of temporomandibular joint (TMJ) discs from six adult dogs. Each disc was divided mediolaterally into medial, middle, and lateral parts. Under tension, the articular disc exhibited a non-linear stress-strain relationship, which could be represented as two lines (two moduli of elasticity) connected at a point of stress around 1.5 MPa. These two elastic moduli of the disc were approximately 44 MPa and 92 MPa in the lower- and higher-stress regions, respectively. Elastic moduli of the articular disc in the middle area were significantly different from that in the lateral area of the disc. The reaction to external force appeared to be different in the medial, middle, and lateral regions of the disc.

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