Tractional forces on porcine temporomandibular joint discs

J. C. Nickel, L. R. Iwasaki, M. W. Beatty, D. B. Marx

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Tractional forces on the temporomandibular joint (TMJ) disc predispose tissue fatigue. This study tested the hypotheses that tractional forces: (1) increased with stress-field velocity (V) and aspect ratio (AR, contact area diameter/cartilage thickness), and compressive strain (μ); and (2) varied depending on cartilage thickness. Porcine TMJ discs (n = 187) received a 10-N vertical static load via an acrylic indenter for 1, 5, 10, 30, or 60 sec, followed by movement. Physical data were recorded and analyzed by quadratic regression relations and a likelihood ratio test. Results showed non-linear increases in tractional forces that were positively correlated with increased V, AR, and μ when the stress-field moved onto relatively thicker (R2 = 0.83) and thinner cartilage (R2 = 0.86). When V was > 27 mm/sec and ARĝ€¢μ3, was > 0.09, tractional forces were significantly higher (ĝ‰Currency sign 12% of peak) when the stress-field moved onto thicker cartilage. Stress-field dynamic mechanics and cartilage thickness significantly affected TMJ disc tractional forces. Abbreviations : LVDT = linear voltage differential transformer, PBS = phosphate-buffered physiological saline solution, TMJ = temporomandibular joint, V = velocity, AR = aspect ratio, μ = compressive strain, UNMC = University of Nebraska Medical Center, 1/4T = tractional coefficient, 1/4 S = static coefficient of friction.

Original languageEnglish (US)
Pages (from-to)736-740
Number of pages5
JournalJournal of dental research
Issue number8
StatePublished - Aug 2009
Externally publishedYes


  • Cartilage
  • Strain
  • TMJ
  • Traction
  • Velocity

ASJC Scopus subject areas

  • Dentistry(all)


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