Three-dimensional finite element analysis of human temporomandibular joint with and without disc displacement during jaw opening

Tanaka, Eiji; Pozo, Rodrigo del; Tanaka, Masao; Asai, Daisuke; Hirose, Miho; Iwabe, Tatsunori; Tanne, Kazuo

doi:10.1016/j.medengphy.2004.03.001

Cited by 92 publications

(64 citation statements)

References 19 publications

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“…This deterioration of biomechanical properties of discs could be an indication of early degeneration, and is consistent with changes in articular cartilage due to inflammation (Silver et al, 2002). During mandibular movements, discs often endure and absorb peak loads by deformation in a certain area (Tanaka et al, 2004). In the present study, to observe biomechanical properties under significant deformation, we set 40% strain of compression and 30% strain of tension as loading limits.…”

Section: Discussionsupporting

confidence: 63%

Deterioration of Mechanical Properties of Discs in Chronically Inflamed TMJ

Wang¹,

Cui²,

Liu³

et al. 2014

J Dent Res

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Temporomandibular joint (TMJ) discs frequently undergo degenerative changes in arthritis. However, the biomechanical properties of pathogenic discs remain to be explored. In this study, we evaluated the effects of chronic inflammation on the biomechanical properties of TMJ discs in rats. Chronic inflammation of TMJs was induced by double intra-articular injections of complete Freund's adjuvant for 5 weeks, and biomechanical properties and ultrastructure of the discs were examined by mechanical testing, scanning electron microscopy, and transmission electron microscopy. The instantaneous compressive moduli of the anterior and posterior bands of discs in inflamed TMJs were decreased significantly compared with those in the control group. The instantaneous tensile moduli of the discs of inflamed TMJs also showed significant decreases in both the anteriorposterior and mesial-lateral directions. The relaxation moduli of the discs of inflamed TMJs showed nearly the same tendency as the instantaneous moduli. The surfaces of the discs of inflamed TMJs became rough and porous due to the loss of the superficial gel-like stratum, with many collagen fibers exposed and degradation of the sub-superficial collagen fibrils. Our results suggested that chronic inflammation of TMJ could lead to deterioration of mechanical properties and alteration of disc ultrastructure, which might contribute to TMJ disc displacement.

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Section: Discussionsupporting

confidence: 63%

Deterioration of Mechanical Properties of Discs in Chronically Inflamed TMJ

Wang¹,

Cui²,

Liu³

et al. 2014

J Dent Res

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“…Upon reconstruction of the condyle hard tissue and articular eminence from CT data, the soft tissue of the disc was detected using MRI data. A condyle cartilage layer with a uniform thickness of 0.2 mm was added to the bony surface of the mandibular condyle [18], and the friction coefficient inside the TMJ was assumed to be 0.01 [19]. The structures of the condyle, disc, and articular eminence were regarded as a continuous integer.…”

Section: Ingestion and Transformation Of Tmj Numerical Imagesmentioning

confidence: 99%

Research on Biomechanical Behavior of Temporomandibular Joint Disorders Using Occlusal Splint Treatment: Computed-Aided Analysis

Tsai¹

2015

J Biomed Sci

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The purpose of this study is to develop a three-dimensional (3D) finite element model of the temporomandibular joint (TMJ) and to further investigate the stress distributions after occlusal splint therapy. Six patients with anterior disc displacement without reduction were reconstructed before and after six months of occlusal splint treatments from computed topography (CT) and magnetic resonance imaging (MRI). One must focus on the magnitude and location of the maximum stresses under physiological loading. In the 3D model studies, each mandibular condyle, disc, and articular eminence was divided into five regions: anterior, posterior, central, medial, and lateral. The results of this study show that the abnormal von Mises stresses occurred in the condyle during jaw closing, and overloading of the anterior condyle and posterior disc during jaw opening occurred before treatment. Stresses of all regions became well distributed after treatment, and an approximately 30% stress reduction in the condyle and a 35% stress reduction in the disc were found during jaw opening (p < 0.05), a remarkable difference. This result shows the potential clinical benefits in terms of proven superior biomechanical behavior according to occlusal splint treatment.

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“…Vollmer et al (2000) conducted experimental and finite element study of human mandible to investigate its complex biomechanical behavior. Tanaka et al (2001Tanaka et al ( , 2004) developed a 3D model to investigate the stress distribution in the TMJ during jaw opening, analyzing the differences in the stress distribution of the disc between subjects with and without internal derangement. Tanaka et al (2008c) suggested, from the results of finite element model of the TMJ based on magnetic resonance images, that increase of the frictional coefficient between articular surfaces may be a major cause for the onset of disc displacement.…”

Section: In-vitro Assessment -Mechanical Testing and Finite Element Mmentioning

confidence: 99%