title: 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.
authors: Department of Orthodontics and Craniofacial Developmental Biology, Hiroshima University Graduate School of Biomedical Sciences, 1-2-3 Kasumi, Minami-Ku Hiroshima 734-8553, Japan. etanaka@hiroshima-u.ac.jp
authors: Eiji
authors: E
authors: Tanaka
authors: Rodrigo
authors: R
authors: del Pozo
authors: Masao
authors: M
authors: Tanaka
authors: Junko
authors: J
authors: Aoyama
authors: Koichi
authors: K
authors: Hanaoka
authors: Akira
authors: A
authors: Nakajima
authors: Shinichi
authors: S
authors: Inuzuka
authors: Kazuo
authors: K
authors: Tanne
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D002417:Cattle; D019245:Compressive Strength; D012212:Rheology; D013314:Stress, Mechanical; D019224:Temporomandibular Joint Disc / Q000502:physiology*; D014867:Water / Q000378:metabolism
chemical_list: D014867:Water