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Biomaterials & Bioengineering

Dynamic Properties of Bovine Temporomandibular Joint Disks Change with Age

E. Tanaka*, J. Aoyama, M. Tanaka1, H. Murata2, T. Hamada2 and K. Tanne

Department of Orthodontics, Hiroshima University Faculty of Dentistry, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan;
1 Division of Mechanical Science, Department of Systems and Human Science, Osaka University School of Engineering Science;
2 Department of Prosthetic Dentistry, Hiroshima University Faculty of Dentistry;

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

The temporomandibular joint disk exhibits morphological and biochemical age-related changes. However, the possible age-related changes of the dynamic viscoelasticity in the disk are unclear. We tested the hypothesis that the dynamic viscoelastic properties of the disk change with age. Thirty-six disks from young-adult, adult, and mature-adult cattle were used for dynamic tensile tests. In all disks, the magnitudes of the complex modulus, the storage modulus, and the loss modulus increased as the frequency increased. The mature-adult disks had higher values of these moduli than did the younger disks. The loss tangent ranged from 0.1 to 0.3, which means that the disk has relatively large elasticity and relatively small viscosity. It was concluded that both the elasticity and viscosity of the disk increase with age. This may reflect age-related changes in biochemical composition.

Key Words: temporomandibular joint disk • dynamic viscoelasticity • aging

Journal of Dental Research, Vol. 81, No. 9, 618-622 (2002)
DOI: 10.1177/154405910208100908
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