Dynamic Shear Properties of the Temporomandibular Joint Disc

Tanaka, Eiji; Hanaoka, Koichi; Eijden, T.M.G.J. van; Tanaka, Masao; Watanabe, Mineo; Nishi, Masato; Kawai, Nobuhiko; Murata, Hiroshi; Hamada, Takashi; Tanne, Kazuo

doi:10.1177/154405910308200315

Cited by 48 publications

(39 citation statements)

References 21 publications

(31 reference statements)

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“…40 In this study, the dynamic shear properties were examined only in the anteroposterior direction, which is likely to be the dominant direction for shear deformations. As the dynamic shear moduli of the fibrocartilagious disc of the TMJ were significantly larger in this direction than mediolaterally, 14 a similar directional dependency could be expected in the condylar cartilage. However, both structures differ regarding the orientation of their collagen fibers.…”

Section: Discussionsupporting

confidence: 53%

“…1(B)]. The dynamic viscoelastic behavior of stress and strain can be quantified by the complex shear modulus G*, the shear storage modulus G 0 , the shear loss modulus G 00 , and the loss tangent tan d. 11,14 . The complex modulus G* is a combination of G 0 and G 00 .…”

Section: Dynamic Viscoelastic Parametersmentioning

confidence: 99%

“…In previous studies, it was reported that the shear stress is very sensitive not only to the frequency and direction of the loading but also to the amount of shear and compressive strain. 10,11,[13][14][15] Thus far, however, both the quantitative and qualitative aspects of this relationship have not been assessed for the condylar cartilage of the mandible.…”

Section: Introductionmentioning

confidence: 99%

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Biomechanical response of condylar cartilage‐on‐bone to dynamic shear

Tanaka

Braga

Inubushi

et al. 2007

J Biomedical Materials Res

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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 delta 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.

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Section: Discussionsupporting

confidence: 53%

Section: Dynamic Viscoelastic Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biomechanical response of condylar cartilage‐on‐bone to dynamic shear

Tanaka

Braga

Inubushi

et al. 2007

J Biomedical Materials Res

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“…The current investigation focused on the mechanical characteristics of the disc during cyclic shear Previous investigations by Tanaka and co-workers have shown that the disc experiences shear stiffening, or increase in elastic modulus, as ε or F is increased, and, conversely, shear softening with increasing γ (Tanaka et al, 2003b(Tanaka et al, , 2004. Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have evaluated shear under static shear loading conditions and have shown regional variations of the TMJ disc properties (Lai et al, 1998). Current investigations of the TMJ under dynamic shear conditions have focused on the central region of the disc's intermediate zone (Tanaka et al, 2003b(Tanaka et al, , 2004Koolstra et al, 2007). The relationship between repetitive shear and compressive loading of the intervertebral disc and disc damage has been alluded to by Callaghan and Iatridis and colleagues, who suggested that disc herniation and damage may be more linked to repeated flexion extension and shear motions than to applied joint compression (Callaghan and McGill, 2001;Iatridis and ap Gwynn, 2004).…”

Section: Introductionmentioning

confidence: 99%

Shear Mechanics of the TMJ Disc

2012

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A supplemental appendix to this article is published electronically only at http://jdr.sagepub.com/supplemental. ABSTRACTThe temporomandibular joint (TMJ) is a complex hinge and gliding joint that induces significant shear loads onto the fibrocartilage TMJ disc during jaw motion. The purpose of this study was to assess regional variation in the disc's shear loading characteristics under physiologically relevant loads and to associate those mechanical findings with common clinical observations of disc fatigue and damage. Porcine TMJ discs were compressed between an axially translating bottom platen and a 2.5-cm-diameter indenter within a hydrated testing chamber. Discs were cyclically sheared at 0.5, 1, or 5 Hz to 1, 3, or 5% shear strain. Within the anterior and intermediate regions of the disc when sheared in the anteroposterior direction, both shear and compressive moduli experienced a significant decrease from instantaneous to steady state, while the posterior region's compressive modulus decreased approximately 5%, and no significant loss of shear modulus was noted. All regions retained their shear modulus within 0.5% of instantaneous values when shear was applied in the mediolateral direction. The results of the disc's regional shear mechanics suggest an observable and predictable link with the common clinical observation that the posterior region of the disc is most often the zone in which fatigue occurs, which may lead to disc damage and perforation.

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Influence of additive hyaluronic acid on the lubricating ability in the temporomandibular joint

Kawai

Tanaka

Takata

et al. 2004

J Biomedical Materials Res

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In synovial fluid, hyaluronic acid (HA) is an essential component for the lubrication of joints, thus preventing friction. The relationship between HA and joint friction is not unambiguously established yet. In the present study, the effect of the application of HA on the frictional coefficient in the temporomandibular joint was evaluated. After measuring the frictional coefficient in intact porcine joints (n = 10), the subsequent effect of phosphate-buffered saline (PBS) washing and gauze scouring and the application of HA was examined. Compared with the intact joint, the frictional coefficient was significantly larger after PBS washing and gauze scouring. Subsequent application of HA resulted in a significant decrease (50-75%) of the frictional coefficient. However, it did not recover to the same value as in the intact joints. Observations by scanning electron microscopy showed that after PBS washing, the amorphous layer of the articular cartilage was still intact, whereas it was partially collapsed after gauze scouring. In conclusion, the addition of HA did reduce the coefficient of friction under the experimental conditions in this study; the relevance to the clinical condition and the duration of the treatment effect in vivo require further investigation.

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Dynamic Shear Properties of the Temporomandibular Joint Disc

Cited by 48 publications

References 21 publications

Biomechanical response of condylar cartilage‐on‐bone to dynamic shear

Biomechanical response of condylar cartilage‐on‐bone to dynamic shear

Shear Mechanics of the TMJ Disc

Influence of additive hyaluronic acid on the lubricating ability in the temporomandibular joint

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