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Transcranial radiography and linear tomography: a comparative study.

K L Knoernschild1, S A Aquilino, A Ruprecht

  • 1University of Iowa, College of Dentistry, Iowa City.

The Journal of Prosthetic Dentistry
|August 1, 1991
PubMed
Summary
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Radiographs often inaccurately show mandibular condyle position in the glenoid fossa for temporomandibular disorders. Only corrected linear tomographs accurately reflected condyle-fossa relationships, unlike transcranial radiographs.

Area of Science:

  • Dentistry
  • Radiology
  • Anatomy

Background:

  • Controversy exists regarding the accuracy of radiographs for assessing temporomandibular joint (TMJ) disorders.
  • Determining the precise position of the mandibular condyle within the glenoid fossa is crucial for diagnosis and treatment planning.

Purpose of the Study:

  • To compare joint space measurements from transcranial radiographs and linear tomographs with actual anatomic joint spaces.
  • To evaluate the accuracy of radiographic methods in determining condylar position within the glenoid fossa.

Main Methods:

  • Measurements of anterior, superior, and posterior joint spaces were taken from radiographs using a sonic digitizer.
  • Anatomic joint spaces were measured using polyether impressions.
  • Relative condylar position was classified using posterior/anterior joint space ratios.

Related Experiment Videos

  • Pearson correlations were used to assess consistency between radiographic and anatomic measurements.

    • Main Results:

    • Standard and corrected transcranial projections failed to accurately reproduce anatomic joint spaces and relative condylar positions.
    • Corrected linear tomographic projections demonstrated accuracy in reflecting condyle-fossa relationships.
    • Transcritical radiographs showed significant discrepancies compared to actual joint anatomy.

    Conclusions:

    • Transcritical radiography is unreliable for assessing condylar position in the glenoid fossa for TMJ disorder diagnosis.
    • Corrected linear tomography offers a more accurate radiographic method for evaluating condyle-fossa relationships.
    • Accurate assessment of condylar position is vital for effective TMJ disorder management.