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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 ligament supports the joint when high posterior forces occur and limits the posterior displacement of the mandible. It also constraints the condyle during opening (Osborn et al. 1989). It is composed of two bundles of fibers which attach at the zygomatic arch and the neck of the mandible. The lateral pterygoid muscle attaches to the condyle, and in the majority of cases, also directly to the articular disc. The lateral pterygoid muscle is the main responsible for the anterior incursion of the condyle and the disc.
Head and Neck
Published in Rui Diogo, Drew M. Noden, Christopher M. Smith, Julia Molnar, Julia C. Boughner, Claudia Barrocas, Joana Bruno, Understanding Human Anatomy and Pathology, 2018
Rui Diogo, Drew M. Noden, Christopher M. Smith, Julia Molnar, Julia C. Boughner, Claudia Barrocas, Joana Bruno
The capsule of the temporomandibular joint is loose and its lateral surface is reinforced by the temporomandibular ligament. On the inner aspect of the mandible lie the digastric fossa for the anterior digastric muscle, mylohyoid line for the mylohyoid muscle, lingula for the attachment of the sphenomandibular ligament and submandibular fossa, mylohyoid groove for the mylohyoid nerve and vessels, and mandibular foramen for the inferior alveolar nerve and vessels (Plates 3.8b and 3.28). These neurovascular structures pass distally in the mandibular canal and provide innervation to the mandibular teeth. Within the mandibular canal, the mental nerve branches from the inferior alveolar nerve and exits through the mental foramen to reach the outer surface of the mandible and innervate the chin and lower lip.
Anatomy and Embryology of the Mouth and Dentition
Published in John C Watkinson, Raymond W Clarke, Terry M Jones, Vinidh Paleri, Nicholas White, Tim Woolford, Head & Neck Surgery Plastic Surgery, 2018
The main ligament limiting lateral movement at the TMJ is the lateral ligament (temporomandibular ligament), which cannot be readily separated from the capsule. It runs downwards and backwards from the articular tubercle (a bony protrusion on the lateral surface of the articular eminence) to the lateral surface and posterior border of the neck of the mandibular condyle.19 To help resist posterior movement of the mandibular condyle, the lateral ligament is reinforced by a horizontal band of fibres running from the articular eminence to the lateral surface of the condyle. As there is little evidence of a medial ligament, medial displacement of the TMJ is likely to be prevented by the lateral ligament of the opposite side.
Temporomandibular disorders in growing patients after treatment of class II and III malocclusion with orthopaedic appliances: a systematic review
Published in Acta Odontologica Scandinavica, 2018
Antonio Jiménez-Silva, Romano Carnevali-Arellano, Matías Venegas-Aguilera, Julio Tobar-Reyes, Hernán Palomino-Montenegro
Three studies aimed to establish the relationship between orthopaedic appliances to correct class III malocclusion in growing patients and the development of TMD, considering fixed appliances such as Jasper Jumper (JJ) and removable appliances as: Delaire facemask, cervical headgear and chin cup. It has been assumed that orthopaedic forces applied from the chin to the posterosuperior part of the condyle contribute to the development of TMD [19,73]. However, some TMJ elements, such as the temporomandibular ligament (TML) have not been considered. The backward and upward movement of the condyle generated by the chin cup is inhibited by the horizontal portion of the TML, so this ligament would act as a safety mechanism against this situation [74]. In addition, in a study performed by Gökalp et al. [18], they observed that if the chin cup is used during premature growth periods and if the magnitude of the forces does not exceed the physiological limits, there would be no changes in position and shape of the articular disc. When quality of the evidence was considered, all articles analyzed were exposed to a high risk of bias (Table 6).
The Biomechanical Effects of Sagittal Split Ramus Osteotomy on Temporomandibular Joint
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2018
Zhan Liu, Jingheng Shu, Yuanli Zhang, Yubo Fan
The disc not only had backward and inward displacements, but also clockwise rotated in the outer lateral view. Higher tension occurred in the anterior attachments of the discs, as a result of the backward displacement of the disc relative to the condylar and temporal cartilage. Meanwhile, the inward displacement of the disc resulted in a smaller tension (the magnitude of 10e−3) in the posterior attachments. Under the central occlusion, the temporomandibular ligament and sphenomandibular ligament were subjected to a small tension (of the magnitude of 10e−4 to 10e−3), related to the fact that the ligaments mainly prevent the inward displacement of disc. However the stylomandibular ligament relaxed.
Preliminary simulation model toward the study of the effects caused by different mandibular advancement devices in OSAS treatment
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2018
Agnese Brunzini, Antonio Gracco, Alida Mazzoli, Marco Mandolini, Steve Manieri, Michele Germani
The glenoid fossa and mandible are linked each other by means of the articular disc and the stylomandibular, sphenomandibular and temporomandibular ligaments. Each ligament is connected to the other components of the simulation model through a ‘bonded’ contact model, thus relative motion between the involved surfaces is not allowed.