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Effects of introducing gap constraints in the masticatory system: A finite element study
Published in J. Belinha, R.M. Natal Jorge, J.C. Reis Campos, Mário A.P. Vaz, João Manuel, R.S. Tavares, Biodental Engineering V, 2019
S.E. Martinez Choy, J. Lenz, K. Schweizerhof, H.J. Schindler
The temporomandibular joint (TMJ) is a synovial joint which articulates the jaw to the skull. It is composed principally by the mandibular condyle, the mandibular fossa, the articular disc, the capsule, the ligaments and the lateral pterygoid muscle. The articulating surfaces of the condyles and the mandibular fossa are covered with articular cartilage, which together with the synovial fluid allows for a very low coefficient of friction and a uniform transmission of compressive forces to the bone (Radin et al. 1971). The articular cartilage of the TMJ contains both collagen fibers type I and type II, which classifies it as fibrocartilage. Due to the low permeability of the tissue, compression forces rapidly increase fluid pressure, which in turn carries the major part of the load through hydrostatic pressurization (Mow et al. 2005). The collagen fibers of the cartilage, on the other hand, resist the stretching of the tissue from tensile forces (Hukins et al. 1984). The articular disc, also composed of fibrocartilage, lies between the mandibular condyle and the fossa, dividing the synovial joint in two. It distributes loads and dissipates the energy caused from impact loads. The disc allows for relative motion between the condyle and the temporal bone. In the case of the condyle, both translational and rotational motions are possible. The articular disc is connected to the articular surfaces through the joint capsule. The attachments of the joint capsule can be divided as shown in Figures 1–2 into medial, lateral, anterior and posterior attachments. These attachments give the disc a range of movement and at the same time avoid extreme displacements that may result in the dislocation of the disc.
Finite element analysis of 3D-printed personalized titanium plates for mandibular angle fracture
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2023
Yan Li, Hui Li, Qingguo Lai, Runqi Xue, Kaiwen Zhu, Yanwei Deng
Setting freedom constrains on the anatomical attachment points of the mandibular temporal muscle, masseter muscle, medial pterygoid muscle and lateral pterygoid muscle, ignoring the surrounding attachment ligaments and smaller muscles of the mandibular (Sun et al. 2004). The muscle strength is 1/2 of the maximum occlusal force and decomposed according to the coordinate axis (Quiroga and Garcia 2003; Thresher and Saito 1973) by simulating central occlusion and healthy side molar occlusion (Figure 5). The specific occlusal force is shown in Table 2.
Morphological analysis of the temporomandibular joint in patients with anterior disc displacement
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2023
Tinghui Sun, Bingmei Shao, Desmond Y. R. Chong, Zhan Liu
As for the treatment of ADD, obviously conservative approaches would be more acceptable than surgery. Occlusal splint treatment is a safe and effective way for ADDwR to reposition the mandible and therefore alter the interactions among the condyle, articular disc, articular fossa-eminence, lateral pterygoid muscle and retrodiscal tissue (Klasser and Greene 2009; Poluha et al. 2019).