Stress analysis during jaw movement based on vivo computed tomography images from patients with temporomandibular disorders |
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| Authors: | H.-Y. Cheng P.-W. Peng Y.-J. Lin S.-T. Chang Y.-N. Pan S.-C. Lee K.-L. Ou W.-C. Hsu |
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| Affiliation: | 1. Department of Mechanical Engineering, College of Engineering, National Taiwan University, Taipei 106, Taiwan;2. Research Center for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei 110, Taiwan;3. Research Center for Biomedical Implants and Microsurgery Devices, Taipei Medical University, Taipei 110, Taiwan;4. School of Dental Technology, Taipei Medical University, Taipei 110, Taiwan;5. Graduate Institute of Biomedical Engineering, National Taiwan University of Science and Technology, Taipei 110, Taiwan;6. Department and Graduate Institute of Physical Education and Health, Taipei Physical Education College, Taipei 111, Taiwan;7. Department of Physical Medicine and Rehabilitation, Tri-Service General Hospital, National Defense Medical Center, Taipei 114, Taiwan;8. Graduate Institute of Biomedical Materials and Engineering, Taipei Medical University, Taipei 110, Taiwan |
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| Abstract: | The purpose of this study is to develop three-dimensional (3D) finite element models of temporomandibular joints (TMJs) and to investigate stress distributions. To determine the causes of temporomandibular disorders (TMDs), the magnitude and location of the maximum stresses under physiological loading must be considered. Stress analysis TMD models were reconstructed from computed tomography (CT) data. Several studies have investigated finite element TMJ models, but few have used a bilateral mandible model that includes jaw closing and maximum opening. In this study, the authors defined an asymmetry index for the different stress values on each side joint; this index has not yet been investigated. According to clinical observation, one joint affects the other side joint during mastication. Three symptom-free volunteers and three symptomatic patients were selected as the control group (CG) and TMD group (TG), respectively. For the TG, data analysis indicated that the condyle was asymmetrical during jaw closing, while both the condyle and disc were slightly asymmetrical during jaw opening. The maximum stresses did not significantly differ between the CG and TG for either closing or opening of the jaw. The results of this study have a potential clinical benefit in terms of proving superior biomechanical behaviour. |
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