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Related Experiment Videos

Disc movements over the condylar head. Radiographical study on autopsy materials.

M Meunissier1, A Meunier, P Carpentier

  • 1Faculté de Médecine Lariboisière-Saint-Louis, CNRS au Laboratoire de Recherche Orthopédique, Paris, France.

Journal of Oral Rehabilitation
|September 1, 1993
PubMed
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This study analyzed temporomandibular joint disc movement during jaw opening. Findings show a 5% width reduction and significant translation between the disc and condyle in the lower compartment.

Area of Science:

  • Temporomandibular Joint (TMJ) biomechanics
  • Radiographic analysis of craniofacial structures

Background:

  • Understanding the dynamic behavior of the temporomandibular joint (TMJ) disc is crucial for diagnosing and treating related disorders.
  • Previous studies have utilized various methods to assess disc-condyle interactions, but precise measurement of posterior band movement during function remains an area of interest.

Purpose of the Study:

  • To radiographically evaluate the positional changes of the disc posterior band relative to the condylar head during mandibular opening.
  • To quantify the linear path and displacement of disc landmarks during jaw excursion.

Main Methods:

  • A radiographic study was conducted on six embalmed human subjects.
  • Micro stainless steel balls were affixed as landmarks to the bone and the disc for precise X-ray identification.

Related Experiment Videos

  • Data was processed across different phases of mandibular movement in selected planes to calculate landmark coordinates and path lengths.

    • Main Results:

    • A 5% reduction in disc width was observed during the mandibular opening movement.
    • Significant translational movement between the disc and the condyle was detected within the lower compartment of the TMJ.

    Conclusions:

    • The study demonstrates measurable changes in disc morphology and position during jaw opening.
    • The findings strongly suggest substantial translation occurs between the articular disc and the condyle in the lower joint compartment, contributing to normal jaw function.