Mechanical response of the porcine temporomandibular joint disc to an impact event and repeated tensile loading

Mark W. Beatty, Jeffrey Nickel, Laura Iwasaki, Mark Leiker

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Aims: To test for orthotropy in the stress-strain behavior of the temporomandibular joint (TMJ) disc under repeated physiologic loading before and after an impact event. Methods: Two groups, each consisting of 10 discs, were subjected to repeated tensile cycling in the dorsoventral (group 1) and mediolateral (group 3) direction. Two additional groups, each consisting of 10 discs, had preconditioning in the form of a 1.18 N·s impulsive load before tensile cycling in either the dorsoventral (group 2) or mediolateral (group 4) direction. Physiologic loads of 1 to 3 N were cycled at 0.1 Hz, and stress-strain responses were recorded every cycle between 1 to 10 cycles, and then periodically at 50, 100, 500, 750, and 1,000 cycles. The properties of elastic modulus, residual strain upon unloading, and area contained within the hysteresis loop were measured. Results: Dorsoventral loading produced 5-fold higher elastic modulus, 5-fold lower residual strain, and 5-fold lower hysteresis compared to mediolateral tensile loading (P ≤ .001). Repeated loading effectively reduced the viscous response for all discs, as the elastic modulus increased while residual strain and hysteresis decreased. Impulsive loading caused elastic modulus to increase for dorsoventrally cycled discs, whereas hysteresis decreased for mediolaterally cycled discs (P ≤ .05). Conclusion: The findings suggest that damage from the impact load may have increased the porosity of the extracellular matrix, which ultimately resulted in additional stress transfer to the collagen fibers during loading. Impulsive loads may be an important preconditioning factor in the fatigue failure of the TMJ disc in vivo.

Original languageEnglish (US)
Pages (from-to)160-166
Number of pages7
JournalJournal of Orofacial Pain
Volume17
Issue number2
StatePublished - Sep 29 2003
Externally publishedYes

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Temporomandibular Joint Disc
Elastic Modulus
Swine
Porosity
Fatigue
Extracellular Matrix
Collagen

Keywords

  • Cartilage
  • Fatigue
  • Stress-strain
  • TMJ disc
  • Viscoelasticity

ASJC Scopus subject areas

  • Dentistry(all)
  • Clinical Neurology
  • Anesthesiology and Pain Medicine

Cite this

Mechanical response of the porcine temporomandibular joint disc to an impact event and repeated tensile loading. / Beatty, Mark W.; Nickel, Jeffrey; Iwasaki, Laura; Leiker, Mark.

In: Journal of Orofacial Pain, Vol. 17, No. 2, 29.09.2003, p. 160-166.

Research output: Contribution to journalArticle

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