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Critical Reviews in Oral Biology & Medicine
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14(2):138-150 (2003)     Crit Rev Oral Biol Med
© 2003 International and American Associations for Dental Research

BIOMECHANICAL BEHAVIOR OF THE TEMPOROMANDIBULAR JOINT DISC

Eiji Tanaka1,* and Theo van Eijden2

1 Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan; and
2 Department of Functional Anatomy, Academic Center for Dentistry Amsterdam, Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands;

Correspondence: *corresponding author, etanaka{at}hiroshima-u.ac.jp

The temporomandibular joint (TMJ) disc consists mainly of collagen fibers and proteoglycans constrained in the interstices of the collagen fiber mesh. This construction results in a viscoelastic response of the disc to loading and enables the disc to play an important role as a stress absorber during function. The viscoelastic properties depend on the direction (tension, compression, and shear) and the type of the applied loading (static and dynamic). The compressive elastic modulus of the disc is smaller than its tensile one because the elasticity of the disc is more dependent on the collagen fibers than on the proteoglycans. When dynamic loading occurs, the disc is likely to behave less stiffly than under static loading because of the difference of fluid flow through and out of the disc during loading. In addition, the mechanical properties change as a result of various intrinsic and extrinsic factors in life such as aging, trauma, and pathology. Information about the viscoelastic behavior of the disc is required for its function to be understood and, for instance, for a suitable TMJ replacement device to be constructed. In this review, the biomechanical behavior of the disc in response to different loading conditions is discussed.

Key Words: Stress and strain • viscoelasticity • elastic modulus

Critical Reviews in Oral Biology & Medicine, Vol. 14, No. 2, 138-150 (2003)
DOI: 10.1177/154411130301400207
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