Abstract
BackgroundIntra-articular disorders (ID) or anterior and/or medial displacement of the temporomandibular joint disorder (TMJ) disc are the most common form of TMJ dysfunction (TMD). TMD causes changes in the friction coefficient during TMJ movement. Herein, we provided a three-dimensional (3D) finite-elements model (FEM) including the maxilla, disc, and mandible and evaluated the stress distribution with different friction coefficient.MethodsFourteen volunteers without TMD and 20 patients with MRI-diagnosed TMD were selected. CT and MRI data were collected to build the 3D FEA model of the mandible and TMJ disc. Stress distribution with different friction coefficient was measured.ResultIn the normal model, stress distribution on the TMJ disc was 2.07 ± 0.17, 1.49 ± 0.14, and 1.41 ± 0.14 MPa with 0.001, 0.3, and 0.4 friction coefficient, respectively. In the TMD model, stress distribution was 3.87 ± 0.15, 7.23 ± 0.22, and 7.77 ± 0.19 MPa respectively.ConclusionWhen the friction coefficient of the side with anterior displacement increased, stress on the disc, condyle and mandible of the opposite side increased. Simultaneously, stress values of the disc, condyle and mandible were higher than those of the normal lateral joint.
Highlights
Intra-articular disorders (ID) or anterior and/or medial displacement of the temporomandibular joint disorder (TMJ) disc are the most common form of TMJ dysfunction (TMD)
Finite element analysis (FEA) has been widely used for research on medical biomechanics, especially that of orthopaedic devices under various loading conditions [5,6,7]
The following patients were excluded: (1) those who had undergone any maxillo-facial surgery; (2) those with a history of mental illness; (3) volunteers who were diagnosed with TMJ disorder (TMD) by at least one MRI specialist; and (4) those diagnosed with TMD by two MRI specialists and who had experienced pain with coexisting clicking for > 1 year as well as limitation of mouth opening were included in the study population
Summary
Intra-articular disorders (ID) or anterior and/or medial displacement of the temporomandibular joint disorder (TMJ) disc are the most common form of TMJ dysfunction (TMD). TMD causes changes in the friction coefficient during TMJ movement. We provided a three-dimensional (3D) finite-elements model (FEM) including the maxilla, disc, and mandible and evaluated the stress distribution with different friction coefficient. TMJ disorder (TMD) is a common condition with an estimated incidence of 20–25% [3, 4]. Anterior and/or medial displacement of the articular disc or intraarticular disorders (ID) are the most common form of TMJ dysfunction. Exact causes of TMD are Research on biomechanics of TMJ is limited by the complicated structure of the joint. Traditional biomechanics can cause trauma and have several disadvantages such as non-repeatability and presenting difficulty in comparing different force distributions.
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