Strain‐rate effect on the biomechanical response of bovine temporomandibular joint disk under compression

Abstract

This study evaluates the effect of strain rate on the biomechanical responses of bovine temporomandibular joint (TMJ) disk under compression. Ten specimens derived from the central region of bovine TMJ disks were used for compression tests. Each specimen was loaded upto 20% of strain with seven different strain rates: 1, 10, 20, 30, 40, 50, and 60%/s. Although the stress-strain curves presented similar patterns for all the specimens, the strain-rate effect was obvious. The linear modulus by regression fit for the linear part of the curve was significantly larger at 60%/s of strain rate than at the lower strain rates. The "supplemental stress" ratio (SSR) obviously increased with the augmentation of the strain rate. At strain rates of 30-60%/s, the SSR was significantly larger than those at strain rates below 20%/s. These findings indicate that although water easily can move through the TMJ disk at the lower strain rates, the higher strain rates make such movement difficult. It is concluded that the secondary changes of the TMJ disk may be dependent on the pattern and velocity of masticatory mandibular movements directly associated with the dynamic strain rate in the TMJ disk.

Tissue Engineering of the TMJ Disc: A Review

“…Strain rate, level, frequency, and amplitude have all been noted to have significant effects on TMJ disc compression. 50,51,53,58,59 However, these variations, while significant, are unlikely to completely explain the 100-to 1000-fold variations between studies conducted using similar modalities.…”

Impulsive compression influences the viscous behavior of porcine temporomandibular joint disc

“…The loading machine consisted of a rigid frame, a compression round plate (10 mm diameter) and a digital force gage (20,21). The loading machine consisted of a rigid frame, a compression round plate (10 mm diameter) and a digital force gage (20,21).…”

“…Prior to the tensile test, three experimental groups of eight specimens each were impulsively compressed by a loading machine (EZ-test-500N; Shimadzu, Kyoto, Japan) with different strain rates (0.01, 0.1, and 1 s )1 ) to a final strain of 30%. The loading machine consisted of a rigid frame, a compression round plate (10 mm diameter) and a digital force gage (20,21). The compressive forces and the distance between the compression plates were measured instantaneously.…”