Dynamic compressive properties of porcine temporomandibular joint disc

Abstract

This study aimed to evaluate the effect of the strain frequency and amplitude on the compressive properties of the porcine temporomandibular joint disc and to determine the time-dependent changes associated with energy dissipation. Seven discs were used for compressive cycle tests, including various frequencies and magnitudes of compressive strain. Each experiment consisted of 25 cycles of loading and unloading. Hysteresis and the instantaneous and steady moduli were calculated. All specimens showed a clear hysteresis and repeatable stress-strain relationships within 19 cycles. The hysteresis at the initial cycle ranged between 35% and 62%, and gradually decreased in subsequent cycles. The instantaneous modulus became larger when the strain frequency and the strain amplitude increased. The steady modulus was approximately one-third of the instantaneous one. It was concluded that the disc has an energy-dissipating function during dynamic compression.

A mechanical evaluation of three decellularization methods in the design of a xenogeneic scaffold for tissue engineering the temporomandibular joint disc

“…Based on hysteresis analysis, the energy dissipating capabilities of the Triton X-100 discs were approximately one-third that of the native tissue. This result also implies that these samples have inhibited shock-absorbing capabilities leading to an inferior disc construct, as has been previously hypothesized that the shock-absorbing capabilities of the disc are advantageous during sudden impacts to the joint when rapid energy dissipation is crucial [17,28]. Additionally, the instantaneous and steady-state modulus values, which represent the ability of the discs to resist deformation, were less than half of those of the native tissue.…”

“…The TMJ shows remarkable functional and morphological variation among species and TMJ characterization studies have been carried out on a range of animals including: rabbits [21,22], dogs [23], rats [24,25], sheep [26] and pigs [14,27,28]. While each species has been found to have distinctive TMJ adaptations, the pig in general is the only animal studied to show similar levels of loading to that of the human jaw [29].…”

Biomechanical response of condylar cartilage‐on‐bone to dynamic shear

“…11 The dynamic compressive moduli of the two structures were found to be similar. 26,38 These results imply that the mandibular condylar cartilage has sufficient stiffness for shear loading within a physiological range of frequency. It enables to transfer the tractional forces that are applied repeatedly to the surfaces of the joint and are known to be a potential source of mechanical fatigue.…”

Viscoelastic material model for the temporomandibular joint disc derived from dynamic shear tests or strain-relaxation tests

“…Cyclic large strain compression tests (Tanaka et al, 2003b) were performed with a universal testing machine (EZ-test-500N, Shimadzu, Kyoto, Japan) using the same samples. The instantaneous reaction force F and thickness l were measured (sampling rate 50 ms) with a 500 N load cell (accuracy 1%) and a linear transducer (resolution 0.001 mm), respectively.…”

“…Dynamic small-strain shear tests (Tanaka et al, 2003a(Tanaka et al, , 2004 and large-strain compression tests (Tanaka et al, 2003b) were performed on a porcine TMJ disc sample. Storage and loss moduli were derived as a function of the frequency and used to estimate the parameters of a fourmode Maxwell model (Brands et al, 2004;Ferry, 1980 (Allen and Athanasiou, 2006).…”