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Clinical determination of chewing side
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
I. Fediv, A. Carvalho, A. Correia, P. Fonseca
Oral rehabilitation should balance and functionally restore the stomatognathic system, emphasizing its main function: chewing. It was proved that the simple and rapid clinical determination of the FMA indicates the patient PCS and consequently helps the clinician to prevent some musculoskeletal conditions, as well as to diagnosis and plan treatment in oral rehabilitation.
Temporomandibular Joint Dysfunction
Published in Mark V. Boswell, B. Eliot Cole, Weiner's Pain Management, 2005
The importance of occlusion in the etiology of TMD is controversial. Occlusion, from an epidemiology standpoint, does not as a whole play a dominant role in TMD. Occlusal factors should be considered, although as possible contributing factors, when developing a differential diagnosis on an individual basis (McNeill, 1993). Occlusal factors may place the patient at a higher risk for dysfunctions and parafunctional activities, which may result in orofacial pain. Occlusion may play a major role in a given individual and his or her painful state. Another person suffering from similar symptoms may not have occlusion as an etiology. The treating doctor, however, must have a thorough understanding of occlusion to help provide a differential diagnosis. Malocclusion, like all other variables, may be a subset of pain etiologies that needs to be understood and analyzed. The kinematics of the stomatognathic system requires harmony of all components for normal pain-free function. Any aspect of the system at any give time may dominate causing dysfunction with resulting pain. Therefore, a multidisciplinary approach usually yields the best clinical results.
Temporomandibular disorders and neck pain in primary headache patients: a retrospective machine learning study
Published in Acta Odontologica Scandinavica, 2023
Martina Ferrillo, Mario Migliario, Nicola Marotta, Francesco Fortunato, Marino Bindi, Federica Pezzotti, Antonio Ammendolia, Amerigo Giudice, Pier Luigi Foglio Bonda, Alessandro de Sire
Temporomandibular disorders (TMD) is an umbrella term that refers to disorders associated with the masticatory muscles of the stomatognathic system, temporomandibular joint (TMJ), or both [1]. Painful TMD are considered as the main cause of non-odontogenic pain in the orofacial region [2] and it is estimated that 25% of the adult population presents signs and/or symptoms of TMD, with a female/male ratio ranging from 1.5 to 2.5 [3]. The aetiology is not clear, considering the complexity of TMD that have a multitude of risk factors, including oral parafunctions, trauma, and psychological factors [4,5]. According to Diagnostic Criteria for TMD (DC/TMD) Axis I, TMD could be divided in muscle disorders or intra-articular disorders [6]. Indeed, in addition to muscle and joint involvement, neck pain and headache are considered as frequent clinical manifestations of TMD that should be taken into consideration for conservative treatment (e.g. occlusal splints, laser therapy, transcutaneous electrical nerve stimulation, physical therapy, oxygen-ozone therapy, and behavioural therapies) [7–10].
Effect of the dimensions of implant body and thread on bone resorption and stability in trapezoidal threaded dental implants: a sensitivity analysis and optimization
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2020
Mohammad Reza Niroomand, Masoud Arabbeiki
The tooth in the first molar segment in mandible is the first permanent tooth being encountered to the oral environment, hence, it is a common tooth being lost by dental cavities (Chidagam et al. 2017). Failure to replace a missing molar will trigger the consequence of damages to the stomatognathic system by affecting occlusion, arch form, gingival, and periodontal health of adjacent teeth eventually leading to temporomandibular joint (TMJ) issues. Therefore, the mandibular first molar is selected as a basis of solid modeling. The model is designed using ANSYS Workbench 19.1 and includes titanium threaded dental implant (ITI, Institute Straumann, Basel, Switzerland), ceramic prosthetic crown with 2 mm occlusal thickness and a cancellous bone which is covered by a layer of cortical bone (Figure 1). The type of B/2 bone is selected according to the Lekholm and Zarb classification (Lekholm 1985). The thickness of the cortical layer varies within 1.3–2.0 mm range and does not cover the distal and mesial sides.
Analysis of temporomandibular joint dysfunction in paediatric patients with unilateral crossbite using automatically generated finite element models
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2020
Javier Ortún-Terrazas, José Cegoñino, Edson Illipronti-Filho, Amaya Pérez del Palomar
To this end, we propose a methodology that combines AAMs and automated modelling techniques and that it can be divided in 3 main steps. First, an image recognition algorithm recognises the TMJ shape in an area of a panoramic radiograph using an alternative of the IC algorithm that varies the shape and appearance parameters of a previously trained AAM. Next, the landmarks of the recognised shape are used to construct a parametric FE model using a modelling script. The 2 main TMJ movements (working and balancing) are then automatically computed for each patient-specific 2D model. Additionally, four 3D models of the stomatognathic system of 4 subjects were developed from the CBCT images and the lateral chewing was simulated. Finally, the differences between 2D and 3D modelling are evaluated by comparing the mechanical results produced by the 2D and 3D models of the same patient.