Dynamic Properties of the Human Temporomandibular Joint Disc

Beek, Maarten; Aarnts, Maxim P.; Koolstra, J.H.; Feilzer, Albert J.; Eijden, T.M.G.J. van

doi:10.1177/00220345010800030601

Cited by 110 publications

(124 citation statements)

References 22 publications

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“…Maximum peak of the von Mises stress observed in the intermediate zone was also mentioned in previous studies (10,11,14,22). And an anatomical study with a cadaver showed maximum pressure signals during mandibular movements in discs located in the intermediate zone (23).…”

Section: Fm Ferreira Et Alsupporting

confidence: 79%

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Effect of Occlusal Splints on the Stress Distribution on the Temporomandibular Joint Disc

et al. 2017

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Conservative approach, including occlusal splint therapy, is the first option to treat temporomandibular disorders (TMD), because of its reversibility. The present study analyzed the effect of the articular disc position and occlusal splints use on the stress distribution on this disc. A two-dimensional (2D) finite element (FE) model of the temporomandibular joint with the articular disc at its physiologic position was constructed based on cone-beam computed tomography. Three other FE models were created changing the disc position, according to occlusal splint use and anterior disc displacement condition. Structural stress distribution analysis was performed using Marc-Mentat package. The equivalent von Mises stress was used to compare the study factor. Higher stress concentration was observed on the intermediate to anterior zone of the disc, with maximum values over 2MPa. No relevant difference was verified on the stress distribution and magnitude comparing disc positions and occlusal splint use. However, there was stress reduction arising from the use of the occlusal splints in cases of anterior disc displacement. In conclusion, based on the generated FE models and established boundary conditions, the stress increased at the intermediate zone of the TMJ disc during physiological mandible closure. The stress magnitude was similar in all tested situations

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Section: Fm Ferreira Et Alsupporting

confidence: 79%

“…The articular disc was shown to have both viscoelastic and hyperelastic properties and undergoes large deformation (22). Therefore, another form of representation is to consider soft tissues as viscoelastic structures.…”

Section: Discussionmentioning

confidence: 99%

Effect of Occlusal Splints on the Stress Distribution on the Temporomandibular Joint Disc

et al. 2017

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“…The abundance of chondrocyte-like cells in the center of the TMJ disc compared with the periphery corresponds well to the elevated levels of chondroitin sulfate and higher compressive stiffness reported for the center of the disc. [20][21][22][23][24] Moreover, the higher relative number of chondrocyte-like cells on the inferior surface compared with the superior surface of the disc may shed light on functional differences between the inferior and superior joint spaces of the TMJ. These results may suggest a more mechanically demanding environment in the inferior joint space, which is supported by the observed increased levels of degeneration in the inferior space in cases of TMJ disorders.…”

Section: Discussionmentioning

confidence: 99%

Cell Type and Distribution in the Porcine Temporomandibular Joint Disc

Detamore¹,

Hegde²,

Wagle³

et al. 2006

Journal of Oral and Maxillofacial Surgery

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Purpose-Surprisingly little is known about the cellular composition of the temporomandibular joint (TMJ) disc, which is a crucial piece of the puzzle in tissue engineering efforts. Toward this end, cell types were identified and quantified regionally in the TMJ disc.Materials and Methods-Porcine TMJ discs were examined by histology, electron microscopy, and immunohistochemistry. Histology consisted of hematoxylin and eosin staining to identify regional variation of cell type and cell numbers. Transmission electron microscopy was used to elucidate differences in organelle content and pericellular matrix between TMJ disc cells and chondrocytes from hyaline cartilage. Immunohistochemistry was used to assess the presence of smooth and skeletal muscle character in the TMJ disc.Results-The overall ratio of fibroblasts to chondrocyte-like cells in the TMJ disc was approximately 2.35 to 1, with the highest relative number of chondrocyte-like cells in the intermediate zone. Electron microscopy revealed distinct differences between TMJ disc chondrocyte-like cells and chondrocytes from hyaline cartilage with respect to organelles and the

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“…Consequently, the reaction forces attempt to perform a closing jaw rotation about this axis (Koolstra and van Eijden, 1995). The cartilaginous temporomandibular joint disc and the cartilage lining of the articular surfaces are deformable, with a finite and non-linear elasticity (Beek et al, 2001). This elasticity causes the joint reaction force to be dependent on the deformation.…”

Section: Articular Surfacesmentioning

confidence: 99%

Dynamics of the Human Masticatory System

Koolstra

2002

Critical Reviews in Oral Biology & Medicine

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206

110

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ABSTRACT:In this review, the movement characteristics of the human masticatory system are discussed from a biomechanical perspective. The discussion is based upon the three fundamental laws of mechanics applied to the various anatomical structures that are part of the masticatory system. An analysis of the forces and torques applied to the mandible by muscles, joints, articular capsules, and teeth is used to assess the determinants of jaw movement. The principle of relating the interplay of forces to the center of gravity of the lower jaw, in contrast to a hinge axis near its joints, is introduced. It is evident that the muscles are the dominant determinants of jaw movement. The contributions of the individual muscles to jaw movements can be derived from the orientation of their lines of action with respect to the center of gravity of the lower jaw. They cause the jaw to accelerate with six degrees of freedom. The ratio between linear and angular accelerations is subtly dependent on the mass and moments of inertia of the jaw, and the structures that are more or less rigidly attached to it. The effects of articular forces must be taken into account, especially if the joints are loaded asymmetrically. The muscles not only move the jaw but also maintain articular stability during midline movements. Passive structures, such as the ligaments, become dominant only when the jaw reaches its movement boundaries. These ligaments are assumed to prevent joint dislocation during non-midline movements.

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Dynamic Properties of the Human Temporomandibular Joint Disc

Cited by 110 publications

References 22 publications

Effect of Occlusal Splints on the Stress Distribution on the Temporomandibular Joint Disc

Effect of Occlusal Splints on the Stress Distribution on the Temporomandibular Joint Disc

Cell Type and Distribution in the Porcine Temporomandibular Joint Disc

Dynamics of the Human Masticatory System

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