Viscoelastic behavior of the temporomandibular joint disc during masticatory dynamics

2006 ◽  
Vol 39 ◽  
pp. S204
Author(s):  
J.H. Koolstra ◽  
T.M.G.J. van Eijden
Keyword(s):  
Temporomandibular Joint ◽  
Viscoelastic Behavior ◽  
Temporomandibular Joint Disc

Consequences of Viscoelastic Behavior in the Human Temporomandibular Joint Disc

2007 ◽  
Vol 86 (12) ◽  
pp. 1198-1202 ◽  
Author(s):  
J.H. Koolstra ◽  
T.M.G.J. van Eijden
Keyword(s):  
Temporomandibular Joint ◽  
Viscoelastic Behavior ◽  
Material Model ◽  
Von Mises Stress ◽  
Joint Movement ◽  
Temporomandibular Joint Disc ◽  
Apparent Stiffness ◽  
Linear Viscoelastic Material ◽  
Masticatory System ◽  
Von Mises

The consequences of the viscoelastic behavior of the temporomandibular joint disc were analyzed in simulated jaw open-close cycles. It was hypothesized that viscoelasticity helps protect the underlying bone, while augmenting the smoothness of articular movements. Simulations were performed with a dynamic model of the masticatory system, incorporating the joints’ cartilaginous structures as Finite Element Models. A non-linear viscoelastic material model was applied for the disc. The apparent stiffness of the disc to principal stress was largest when the jaw was closed, whereas, with the Von Mises’ stress, it appeared largest when the jaw was open. The apparent stiffnesses appeared to be dependent on both the speed of the movements and the presence of a resistance between the teeth. It was concluded that the disc becomes stiffer when load concentrations can be expected. During continued cyclic motion, it softens, which favors smoothness of joint movement at the cost of damage prevention.

scholarly journals Biomechanical Behavior of the Temporomandibular Joint Disc

2003 ◽  
Vol 14 (2) ◽  
pp. 138-150 ◽  
Author(s):  
Eiji Tanaka ◽  
Theo van Eijden
Keyword(s):  
Temporomandibular Joint ◽  
Viscoelastic Behavior ◽  
Collagen Fibers ◽  
Extrinsic Factors ◽  
Temporomandibular Joint Disc ◽  
Applied Loading ◽  
Biomechanical Behavior ◽  
Flow Through ◽  
The Difference ◽  
Fiber Mesh

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.

Natural Course of Untreated Symptomatic Temporomandibular Joint Disc Displacement without Reduction

1998 ◽  
Vol 77 (2) ◽  
pp. 361-365 ◽  
Author(s):  
K. Kurita ◽  
P.-L. Westesson ◽  
H. Yuasa ◽  
M. Toyama ◽  
J. Machida ◽  
...  
Keyword(s):  
Temporomandibular Joint ◽  
Natural Course ◽  
Disc Displacement ◽  
Temporomandibular Joint Disc
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