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Related Experiment Videos

The kinematic center: a reference for condylar movements

M Yatabe1, A Zwijnenburg, C C Megens

  • 1First Department of Prosthodontics, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.

Journal of Dental Research
|October 1, 1995
PubMed
Summary
This summary is machine-generated.

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The kinematic center of the temporomandibular joint (TMJ) is located posterior and superior to the palpated condyle. Its movement path during opening is longer than the palpated condyle, offering greater consistency.

Area of Science:

  • Biomechanics
  • Craniofacial Anatomy
  • Dental Research

Background:

  • The temporomandibular condyle's kinematic center is crucial for understanding mandibular movement.
  • Previous studies have not precisely defined the kinematic center's location relative to anatomical landmarks.
  • Accurate identification of the kinematic center is essential for modeling TMJ function.

Purpose of the Study:

  • To investigate the location of the kinematic center relative to the palpated lateral pole of the temporomandibular condyle.
  • To compare the lengths of condylar movement paths reconstructed using the kinematic center versus the palpated condyle.
  • To analyze the reproducibility and laterality of the kinematic center's position and movement path.

Main Methods:

  • Recorded mandibular movements with 6 degrees of freedom in 20 healthy subjects.

Related Experiment Videos

  • Utilized a software procedure to calculate the kinematic center based on minimal differences between protrusive and opening movement paths.
  • Averaged kinematic center locations from 16 pairs of protrusive and opening movements per subject.

    • Main Results:

    • The kinematic center was consistently located posteriorly and superiorly to the palpated condylar point (p < 0.0001).
    • The anterior-posterior coordinate of the kinematic center showed less variation than the superior-inferior coordinate (p < 0.0001).
    • The kinematic center's opening movement path length was significantly longer than that of the palpated lateral pole (p < 0.0001).
    • No significant left-right differences were observed for the kinematic center's path length, unlike the palpated condyle.

    Conclusions:

    • The kinematic center represents a more stable and consistent point for describing temporomandibular condyle movement than the palpated lateral pole.
    • The findings provide a more precise anatomical reference for kinematic center location in biomechanical models of the TMJ.
    • This improved understanding can enhance diagnostic accuracy and treatment planning for temporomandibular disorders.