Human temporomandibular joint eminence shape and load minimization

L. R. Iwasaki, M. J. Crosby, D. B. Marx, Y. Gonzalez, W. D. McCall, R. Ohrbach, J. C. Nickel

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Analysis of previous data suggested the hypothesis that temporomandibular joint (TMJ) eminence shapes develop ideally to minimize joint loads. Hence, we tested this hypothesis in nine females and eight males in each of two groups, with and without TMJ disc displacement. Participants provided anatomical data used in a joint load minimization numerical model to predict, and jaw-tracking data used to measure, eminence shapes. Coordinate data (x,y) of shapes were fit to third-order polynomials for two sessions, sides, and methods (predicted, measured) for each participant. Inter-session data were reliable and averaged. Those with, compared with those without, disc displacement had higher measured shape range (5:1) and left-right asymmetry prevalence (4:1). In 29 symmetrical individuals, ANCOVA and Bonferroni tests compared vertical dimensions (y) at 11 posteroanterior points (x), 0.5 mm apart. Model-predicted and measured shapes were significantly different (P ≤ 0.01) near the eminence crest, but joint load minimization was consistent with eminence shape for x < 3.0 mm.

Original languageEnglish (US)
Pages (from-to)722-727
Number of pages6
JournalJournal of dental research
Issue number7
StatePublished - Jul 2010
Externally publishedYes


  • Human
  • Jaw tracking
  • Numerical modeling
  • TMJ

ASJC Scopus subject areas

  • General Dentistry


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