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Consequences of Viscoelastic Behavior in the Human Temporomandibular Joint Disc

J.H. Koolstra^* and T.M.G.J. van Eijden

Department of Functional Anatomy, Academic Centre for Dentistry Amsterdam (ACTA), Meibergdreef 15, 1105 AZ Amsterdam, the Netherlands

View larger version (34K): [in this window] [in a new window]   Figure 1. The model. (A) Antero-lateral view. Red lines: muscle contractile element. Black lines: muscle series-elastic element. Ta: anterior temporalis. Tp: posterior temporalis. Ms: superficial masseter. Mpa: anterior deep masseter. Mpp: posterior deep masseter. Pm: medial pterygoid. Pls: superior lateral pterygoid. Pli: inferior lateral pterygoid. Dig: digastric. GH: geniohyoid. MHa: anterior mylohyoid. MHp: posterior mylohyoid. Thin black lines: part of articular capsule. Dig, GH, and MHp are connected to the hyoid bone (not shown), and MHa is connected to the mylohyoid raphe (black line). (B) Cartilaginous structures of the jaw joint: blue, temporal cartilage layer; orange, articular disc; red, condylar cartilage layer. (C) Sagittal cross-section of the jaw joint.

View larger version (50K): [in this window] [in a new window]   Figure 2. Von Mises’ stress in the articular disc during jaw-closing as a function of jaw gape. (A) Unloaded fast jaw-closing movement. (B) Unloaded slow jaw-closing movement. (C) Fast jaw-closing movement with a 40-N symmetrical load. (D) Slow jaw-closing movement with a 40-N symmetrical load. First columns: sagittal cross-sectional view. Second columns: top view. a: anterior. p: posterior. m: medial. l: lateral. Rows: 1 - maximum open, 2 - 20° open, 3 - 15° open, 4 - 10° open, 5 - 5° open, 6 - closed. Legends: Stress in Pa.

View larger version (16K): [in this window] [in a new window]   Figure 3. Apparent stiffness of the central part of the intermediate zone of the articular disc during 2 subsequent close-open-close cycles. Stiffness in Pa as a function of jaw position. (A) Stiffness in response to the first principal stress. (B) Stiffness in response to the Von Mises’ stress.

View larger version (22K): [in this window] [in a new window]   Figure 4. Decrease of apparent stiffness in the second close-open-close cycles relative to the first ones. Decrease as a function of jaw-opening and as a fraction of the concomitant stiffness in the first cycle. (A) Unloaded fast movement. (B) Unloaded slow movement. (C) Loaded fast movement. (D) Loaded slow movement.

Journal of Dental Research, Vol. 86, No. 12, 1198-1202 (2007)
DOI: 10.1177/154405910708601211


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