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The position and function of the mandibular hinge axis

R I Nairn1

  • 1Department of Prosthetic Dentistry, United Medical and Dental Schools, London, England.

Australian Prosthodontic Journal
|January 1, 1994
PubMed
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The mandibular hinge axis, commonly thought to be on the condylar head, is actually located near the condyle

Area of Science:

  • Anatomy
  • Biomechanics
  • Orthodontics

Background:

  • The precise anatomical location of the human mandibular hinge axis is a subject of ongoing debate.
  • Current understanding often places the hinge axis on or superior to the condylar head.
  • Accurate identification of the hinge axis is crucial for understanding temporomandibular joint (TMJ) function and for orthodontic treatment planning.

Purpose of the Study:

  • To investigate and accurately determine the anatomical location of the mandibular hinge axis.
  • To challenge the conventional belief regarding the hinge axis's position.
  • To correlate the anatomical findings with the functional role of the temporo-mandibular ligament.

Main Methods:

  • Placement of markers on the average hinge axis point before imaging.

Related Experiment Videos

  • Analysis of lateral skull cephalometric radiographs.
  • Skull extrapolation techniques were employed to refine the anatomical localization.

    • Main Results:

    • The study demonstrated that the mandibular hinge axis is not located on the condylar head.
    • Findings indicate the hinge axis is situated remotely from the condylar head, specifically in the region of the condyle's neck.
    • This newly identified location aligns with the anatomical considerations of temporo-mandibular ligament function.

    Conclusions:

    • The conventional anatomical location of the mandibular hinge axis requires revision.
    • The mandibular hinge axis is anatomically located in the neck of the condyle.
    • This finding supports the functional role of the temporo-mandibular ligament in mandibular movement.