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Quintessence Publishing: Journals: OFPH
Journal of Oral & Facial Pain and Headache

Edited by Barry J. Sessle, BDS, MDS, BSc, PhD, FRSC

Official Journal of the American Academy of Orofacial Pain,
the European, Asian, and Ibero-Latin Academies of Craniomandibular
Disorders, and the Australian Academy of Orofacial Pain

ISSN 2333-0384 (print) • ISSN 2333-0376 (online)

Publication:
Spring 1998
Volume 12 , Issue 2

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Evaluation of Shear Stress of the Human Temporomandibular Joint Disc

Lai/Bowley/Burch

Pages: 153-159
PMID: 9656893

The aim of this study was to determine the shear stress of the human postmortem temporomandibular joint (TMJ) disc. Correlation of shear stress with age or with the region of the disc was determined. Nine discs were removed unilaterally from postmortem humans, ages 36 yo 76 years. Disc s were sectioned into lateral (eight), central (eight), and medial (eight) specimens. Each specimen was attached by cyanoacrylate adhesive to a servohydraulic test system aparatus within 48 hours of retrieval. Shear properties were measured under quasistatic conditions with a linear increase of displacement until the specimen failed to maintain maximum resistance to the applied force. The shear moduli were analyzed by means of the Wilcoxon’s signed ranks test. The results shoed that values of shear moduli on peripheral portions (lateral and medial) were significantly higher than on central portions (P = 0.0013). The correlation between the shear moduli of TMJ discs and age showed a regression slope for shear module of -0.326 + 0.0341 x age (r = 0.769; P < 0.01). Periphe ral portions (lateral and medial) have a higher shear moduli and are stiffer than the central portions of discs and shear moduli or stiffness of TMJ discs increase with age.

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