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Related Experiment Videos

Geometric considerations of disk repositioning procedures

L B Heffez1, S L Jordan, G L Crawford

  • 1University of Illinois, College of Dentistry, Department of Oral and Maxillofacial Surgery, Chicago 60612.

Cranio : the Journal of Craniomandibular Practice
|April 1, 1993
PubMed
Summary

Surgical repositioning of the temporomandibular joint (TMJ) disk is complex. Geometric analysis indicates insufficient viable tissue for routine disk repositioning in TMJ internal derangements.

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Area of Science:

  • Oral and Maxillofacial Surgery
  • Biomechanical Engineering
  • Medical Imaging

Background:

  • Internal derangements of the temporomandibular joint (TMJ) often involve disk displacement.
  • Surgical intervention, including disk repositioning, is a treatment option.
  • Understanding the geometric and mechanical feasibility of such procedures is crucial.

Purpose of the Study:

  • To analyze the geometrical and mechanical implications of surgical disk repositioning in TMJ internal derangements.
  • To evaluate the sufficiency of viable joint tissue for routine disk repositioning procedures.

Main Methods:

  • Histological analysis of four TMJ joints with disk displacement.
  • Magnetic Resonance Imaging (MRI) analysis of five TMJ joints with disk displacement.

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  • Geometric assessment of required disk repositioning and tissue modification.

    • Main Results:

    • Significant posterior repositioning of the disk (6.9 mm) was geometrically indicated.
    • Substantial removal of retrodiskal tissue (5.2 mm) and disk trimming (2.1 mm) were required.
    • Calculations suggest a lack of adequate viable tissue for routine surgical repositioning.

    Conclusions:

    • Gross geometric considerations indicate insufficient viable tissue for routine TMJ disk repositioning.
    • Disk repositioning may not be a universally recommended procedure for TMJ internal derangements.
    • Further research into alternative TMJ treatments is warranted.