Premium
Fluid pressurization and tractional forces during TMJ disc loading: A biphasic finite element analysis
Author(s) -
Wu Y.,
Cisewski S. E.,
Wei F.,
She X.,
Gonzales T. S.,
Iwasaki L. R.,
Nickel J. C.,
Yao H.
Publication year - 2017
Publication title -
orthodontics and craniofacial research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 55
eISSN - 1601-6343
pISSN - 1601-6335
DOI - 10.1111/ocr.12147
Subject(s) - finite element method , cabin pressurization , orthodontics , fluid pressure , geology , engineering , medicine , structural engineering , mechanics , physics , mechanical engineering
Structured Abstract Objectives To investigate the ploughing mechanism associated with tractional force formation on the temporomandibular joint ( TMJ ) disc surface. Setting and Sample Population Ten left TMJ discs were harvested from 6‐ to 8‐month‐old male Yorkshire pigs. Materials and Methods Confined compression tests characterized mechanical TMJ disc properties, which were incorporated into a biphasic finite element model ( FEM ). The FEM was established to investigate load carriage within the extracellular matrix ( ECM ) and the ploughing mechanism during tractional force formation by simulating previous in vitro plough experiments. Results Biphasic mechanical properties were determined in five TMJ disc regions (average±standard deviation for aggregate modulus: 0.077±0.040 MP a; hydraulic permeability: 0.88±0.37×10 −3 mm 4 /Ns). FE simulation results demonstrated that interstitial fluid pressurization is a dominant loading support mechanism in the TMJ disc. Increased contact load and duration led to increased solid ECM strain and stress within, and increased ploughing force on the surface of the disc. Conclusion Sustained mechanical loading may play a role in load carriage within the ECM and ploughing force formation during stress‐field translation at the condyle–disc interface. This study further elucidated the mechanism of ploughing on tractional force formation and provided a baseline for future analysis of TMJ mechanics, cartilage fatigue and early TMJ degeneration.