Tensile Properties of the Porcine Temporomandibular Joint Disc

[+] Author and Article Information
Michael S. Detamore, Kyriacos A. Athanasiou

Department of Bioengineering, Rice University, Houston, TX 77251

J Biomech Eng 125(4), 558-565 (Aug 01, 2003) (8 pages) doi:10.1115/1.1589778 History: Received July 25, 2002; Revised April 01, 2003; Online August 01, 2003
Copyright © 2003 by ASME
Topics: Stress , Disks , Tension , Fibers , Stiffness
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Superior view of the isolated TMJ disc, distinguishing the anterior band, intermediate zone, and posterior band
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Schematic of a section of a TMJ disc, from which tensile specimens were obtained. A superior view of a right disc is shown here. From each disc section, exactly three specimens could be prepared, either in the mediolateral direction or the anteroposterior direction. In the mediolateral direction (shading=\\), specimens were obtained from the anterior band, intermediate zone, and posterior band. In the anteroposterior direction (shading=//), specimens were obtained from the medial, central and lateral regions
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Schematic of the custom-made bath/grip assembly mounted into the Instron. B/G, custom-made bath/grip assembly; G, grips; TC, temperature controller; I, immersion heater. Bath diameter is 8 in.
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Example of incremental stress relaxation, whereby a succession of stress relaxation responses is produced via a series of 15 min constant-strain increments. The specimen provided here was from the posterior band, tested in the mediolateral direction
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Stress-strain plots constructed with incremental stress relaxation points from Fig. 4, demonstrating a clear linear region
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Polarized light micrographs depicting the collagen fibers of the TMJ disc (400×). The top and bottom of this figure represent anterior and posterior, respectively, whereas left and right represent medial and lateral, respectively. Note the ringlike orientation of fibers around the disc periphery and anteroposterior fiber alignment in the center of the disc. The schematic diagram of the disc shows the regions A–E where micrographs were taken. (A) Anterior band—note the merging of anteroposterior fibers with mediolateral fibers. (B) Medial region and (D) Lateral region—note the continuation of a ring-like orientation of collagen fibers around the periphery of the disc; fiber density appears to be similar between these regions, but medial fibers appear to have larger diameters. (C) Intermediate zone—note the predominantly anteroposteriorly aligned fibers. (E) Posterior band—note the predominantly mediolateral fibers.




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