Document Detail

Three-dimensional finite-element model of the human temporomandibular joint disc during prolonged clenching.
MedLine Citation:
PMID:  17026512     Owner:  NLM     Status:  MEDLINE    
In the temporomandibular joint (TMJ), overloading induced by prolonged clenching appears to be important in the cascade of events leading to disc displacement. In this study, the effect of disc displacement on joint stresses during prolonged clenching was studied. For this purpose, finite-element models of the TMJ, with and without disc displacement, were used. Muscle forces were used as a loading condition for stress analysis during a time-period of 10 min. The TMJ disc and connective tissue were characterized as a linear viscoelastic material. In the asymptomatic model, large stresses were found in the central and lateral part of the disc through clenching. In the retrodiscal tissue, stress relaxation occurred during the first 2 min of clenching. In the symptomatic model, large stresses were observed in the posterior part of the disc and in the retrodiscal tissue, and the stress level was kept constant through clenching. This indicates that during prolonged clenching the disc functions well in the asymptomatic joint, meanwhile the retrodiscal tissue in the symptomatic joint is subject to excessive stress. As this structure is less suitable for bearing large stresses, tissue damage may occur. In addition, storage of excessive strain energy might lead to breakage of the tissue.
Miho Hirose; Eiji Tanaka; Masao Tanaka; Reiji Fujita; Yukiko Kuroda; Eizo Yamano; Theo M G J van Eijden; Kazuo Tanne
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  European journal of oral sciences     Volume:  114     ISSN:  0909-8836     ISO Abbreviation:  Eur. J. Oral Sci.     Publication Date:  2006 Oct 
Date Detail:
Created Date:  2006-10-09     Completed Date:  2007-01-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9504563     Medline TA:  Eur J Oral Sci     Country:  Denmark    
Other Details:
Languages:  eng     Pagination:  441-8     Citation Subset:  D; IM    
Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima, Japan.
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MeSH Terms
Bite Force
Bruxism / physiopathology*
Dental Stress Analysis
Dislocations / etiology
Finite Element Analysis*
Imaging, Three-Dimensional
Models, Anatomic
Stress, Mechanical
Temporomandibular Joint / physiopathology*
Temporomandibular Joint Disk / injuries,  physiopathology*
Temporomandibular Joint Disorders / physiopathology*

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