Stress analysis in human temporomandibular joint affected by anterior disc displacement during prolonged clenching

Summary Parafunctional habits, such as prolonged clenching and bruxism, have been associated with dysfunctional overloading in the temporomandibular joint (TMJ). In this study, stress distributions in the TMJ were analysed during prolonged clenching, using three‐dimensional finite element (FE) model...

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Bibliographic Details
Published in:	Journal of oral rehabilitation Vol. 40; no. 4; pp. 239 - 246
Main Authors:	Abe, S., Kawano, F., Kohge, K., Kawaoka, T., Ueda, K., Hattori-Hara, E., Mori, H., Kuroda, S., Tanaka, E.
Format:	Journal Article
Language:	English
Published:	England Blackwell Publishing Ltd 01-04-2013
Subjects:	Adult Algorithms Biomechanical Phenomena Cartilage, Articular - pathology Cartilage, Articular - physiopathology Computer Simulation Dentistry Elastic Modulus Female Finite Element Analysis Friction Humans Imaging, Three-Dimensional - methods Joint Dislocations - pathology Joint Dislocations - physiopathology Magnetic Resonance Imaging Mandibular Condyle - pathology Mandibular Condyle - physiopathology Masticatory Muscles - physiopathology Models, Biological Muscle Contraction - physiology parafunction Stress, Mechanical Temporal Bone - pathology Temporal Bone - physiopathology Temporomandibular Joint - pathology Temporomandibular Joint - physiopathology Temporomandibular Joint Disc - pathology Temporomandibular Joint Disc - physiopathology temporomandibular joint disorders Temporomandibular Joint Disorders - pathology Temporomandibular Joint Disorders - physiopathology Young Adult
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Summary:	Summary Parafunctional habits, such as prolonged clenching and bruxism, have been associated with dysfunctional overloading in the temporomandibular joint (TMJ). In this study, stress distributions in the TMJ were analysed during prolonged clenching, using three‐dimensional finite element (FE) models of the TMJ with and without disc displacement. The aim of this study was to investigate stress distribution of the cartilaginous tissues in the TMJ with and without disc displacement. Finite element models were developed on the basis of magnetic resonance images from two subjects with and without anterior disc displacement. Condylar movements recorded during a 5‐min clenching were used as the loading condition for stress analysis. In the asymptomatic model, the highest von Mises stresses were located in the lateral area (4·91 MPa) of the disc surfaces, and after 5‐min clenching, the higher stresses were still located at the lateral area (3·65 MPa). In all the cartilaginous tissues, 30–50% of stress reduction occurred during 5‐min clenching. In contrast, the von Mises stress in the cartilaginous tissues of the symptomatic model with disc displacement was markedly lower, compared with the asymptomatic model. However, in the condylar cartilage, stress relaxation during clenching was not recognised. Furthermore, relatively high stresses were observed in the retrodiscal tissues throughout clenching. The present results indicate that disc position could be involved in the stress distribution of the TMJ components during prolonged clenching.
Bibliography:	ark:/67375/WNG-4BRS43JD-M Ministry of Education, Science and Culture, Japan ArticleID:JOOR12036 istex:D2CCF04B5AFDA53AE7A668F74F51055B6C56F0DC ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0305-182X 1365-2842
DOI:	10.1111/joor.12036