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Journal of Dental Research
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Biomaterials & Bioengineering

Shear Properties of the Temporomandibular Joint Disc in Relation to Compressive and Shear Strain

E. Tanaka1,*, N. Kawai1, K. Hanaoka1, T. van Eijden2, A. Sasaki1, J. Aoyama1, M. Tanaka3 and K. Tanne1

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;
2 Department of Functional Anatomy, Academic Center for Dentistry Amsterdam (ACTA); and
3 Division of Mechanical Science, Department of Systems and Human Science, Osaka University School of Engineering Science;

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

Shear stress can result in fatigue, damage, and irreversible deformation of the temporomandibular joint disc. Insight into the dynamic shear properties of the disc may give insight into the mechanism inducing tissue failure due to shear. We tested the hypothesis that the dynamic shear properties of the disc depend on the amount of shear and compressive strain. Twenty-four porcine discs were used for dynamic shear tests. The specimens were clamped between the plates of a loading apparatus under compressive strains of 5%, 10%, and 15%. Dynamic shear was applied to the specimen by a sinusoidal strain of, respectively, 0.5%, 1.0%, and 1.5%. Both the dynamic elasticity and viscosity were proportional to compressive strain and inversely proportional to shear strain. These shear characteristics suggest a significant role of compressive and shear strain on the internal friction of the disc.

Key Words: temporomandibular joint disc • dynamic shear • compressive strain

Journal of Dental Research, Vol. 83, No. 6, 476-479 (2004)
DOI: 10.1177/154405910408300608
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G.R. Snider, J. Lomakin, M. Singh, S.H. Gehrke, and M.S. Detamore
Regional Dynamic Tensile Properties of the TMJ Disc
Journal of Dental Research, November 1, 2008; 87(11): 1053 - 1057.
[Abstract] [Full Text] [PDF]