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Biomechanical response of condylar cartilage‐on‐bone to dynamic shear
Author(s) -
Tanaka Eiji,
Rego Emanuel B.,
Iwabuchi Yasunori,
Inubushi Toshihiro,
Koolstra Jan Harm,
van Eijden Theo M. G. J.,
Kawai Nobuhiko,
Kudo Yasusei,
Takata Takashi,
Tanne Kazuo
Publication year - 2008
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.31500
Subject(s) - materials science , shear (geology) , shear stress , simple shear , condyle , cartilage , shear modulus , composite material , pure shear , shear rate , anatomy , viscosity , medicine
Shear stress can result in fatigue, damage, and irreversible deformation of the mandibular condylar cartilage. However, little information is available on its dynamic properties in shear. We tested the hypothesis that the dynamic shear properties of the condylar cartilage depend on the frequency and amplitude of shear strain. Ten porcine mandibular condyles were used for dynamic shear tests. Two cartilage‐bone plugs were dissected from each condyle and tested in a simple shear sandwich configuration under a compressive strain of 10%. Sinusoidal shear strain was applied with an amplitude of 1.0, 2.0, and 3.0% and a frequency range between 0.01 and 10 Hz. The magnitudes of the shear dynamic moduli were found to be dependent on the frequency and the shear strain amplitude. They increased with shear strain. tan δ ranged from 0.2 to 0.4, which means that the cartilage is primarily elastic in nature and has a small but not negligible viscosity. In conclusion, the present results show that the shear behavior of the mandibular condylar cartilage is dependent on the frequency and amplitude of the applied shear strain. The observed shear characteristics suggest a significant role of shear strain on the interstitial fluid flow within the cartilage. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2008