Document Detail

Stress-field translation in the healthy human temporomandibular joint.
MedLine Citation:
PMID:  11077988     Owner:  NLM     Status:  MEDLINE    
Movement over the surface of the temporomandibular joint (TMJ) disc produces tractional forces. These forces potentially increase the magnitude of shear stresses and contribute to wear and fatigue of the disc. Theoretically, tractional forces in all synovial joints are the result of frictional forces, due to rubbing of the cartilage surfaces, and plowing forces, due to translation of the stress-field through the cartilage matrix as the joint surface congruency changes during motion. For plowing forces to occur in the TMJ, there must be mediolateral translation of the stress-field as the condyle moves dorsoventrally during jaw function. To test whether mediolateral stress-field translation occurs in the intact TMJ, we measured stress-field position and translation velocities in ten normal individuals during rhythmic jaw opening and closing. Magnetic resonance imaging and jaw tracking were combined to animate the three-dimensional position of the stress-field between the articulating surfaces. This allowed for mediolateral translation velocity measurements of the centroid of the stress-field. The results showed that during jaw opening and closing at 0.5 Hz, the average peak mediolateral translation velocity was 35 +/- 17 mm/sec. When opening and closing increased to 1.0 Hz, the average peak velocity was 40 +/- 19 mm/sec. Theoretical model estimates of the work done during such translation ranged from 6 to 709 mJ between the individual joints studied. The potential clinical importance of this measure is that long-term exposure of the TMJ disc to high work may result in fatigue failure of the TMJ disc.
L M Gallo; J C Nickel; L R Iwasaki; S Palla
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dental research     Volume:  79     ISSN:  0022-0345     ISO Abbreviation:  J. Dent. Res.     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2000-12-04     Completed Date:  2000-12-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0354343     Medline TA:  J Dent Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1740-6     Citation Subset:  D; IM    
Clinic for Masticatory Disorders, Center for Oral Medicine, Dental and Maxillo-Facial Surgery, University of Zürich, Switzerland.
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MeSH Terms
Cartilage, Articular / physiology
Computer Simulation
Dental Stress Analysis*
Imaging, Three-Dimensional
Jaw Relation Record
Magnetic Resonance Imaging
Mandibular Condyle / physiology
Models, Biological
Statistics, Nonparametric
Stress, Mechanical
Temporomandibular Joint / anatomy & histology,  physiology*
Temporomandibular Joint Disk / anatomy & histology,  physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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