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Mechanical properties of human articular disk and its influence on TMJ loading studied with the finite element method
Author(s) -
TANAKA E.,
SASAKI A.,
TAHMINA K.,
YAMAGUCHI K.,
MORI Y.,
TANNE K.
Publication year - 2001
Publication title -
journal of oral rehabilitation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.991
H-Index - 93
eISSN - 1365-2842
pISSN - 0305-182X
DOI - 10.1111/j.1365-2842.2001.tb01699.x
Subject(s) - materials science , elastic modulus , temporomandibular joint , condyle , ultimate tensile strength , stiffness , composite material , finite element method , stress (linguistics) , orthodontics , structural engineering , medicine , linguistics , philosophy , engineering
SUMMARY The present study was designed to investigate the elastic modulus of human temporomandibular joint (TMJ) disk under tension and its influences on TMJ loading. Seven human TMJ disks served as specimens. Continuous tensile stress was applied to each specimen, and the elastic moduli of human TMJ disks were calculated at 2% strain. Furthermore, using a three‐dimensional finite element model of the mandible including the TMJ, changes in the TMJ stresses during clenching were evaluated in association of varying elastic moduli of the articular disk determined by the tensile tests. The elastic moduli at 2% strain varied from 27·1 to 65·2 MPa with a mean of 47·1 MPa. A significant correlation was found between the elastic moduli and age ( P < 0·01). On the surface of condyle, compressive stress in the anterior area and tensile stress in the posterior area increased when the elastic moduli of the TMJ disk was varied from 25 to 65 MPa. In the TMJ disk, shear stresses in all the areas became larger with greater stiffness. In conclusion, it is shown that the elastic modulus of human TMJ disk is increased with age and that higher stiffness of the disk exerts substantial influences on mechanical loading for the TMJ structures.