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Related Experiment Videos

Double contours and craniofacial morphology.

Kazuhiro Yamada1, Kooji Hanada, Takafumi Hayashi

  • 1Div. of Orthodontics, Dept. of Oral Biological Science, Section for Oral Life Science, Niigata University Graduate, School of Medical and Dental Sciences, 2-5274 Gakkocho-dori, Niigata 951-8514, Japan. kazuhiro@dent.niigata-u.ac.jp

Cranio : the Journal of Craniomandibular Practice
|May 19, 2005
PubMed
Summary

Double contours in the temporomandibular joint (TMJ) are linked to specific craniofacial morphology in patients with TMJ disorders. Findings reveal distinct mandibular differences in individuals with bilateral condylar bone changes and double contours.

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Area of Science:

  • Dentistry
  • Orthodontics
  • Radiology

Background:

  • Temporomandibular joint (TMJ) disorders affect craniofacial structures.
  • Understanding craniofacial morphology is crucial for diagnosing and treating TMJ disorders.
  • Double contours are a radiographic finding that may indicate underlying bone changes.

Purpose of the Study:

  • To investigate the relationship between double contours and craniofacial morphology in patients with TMJ disorders.
  • To compare craniofacial structures between patients with and without condylar bone changes.
  • To identify specific morphological features associated with double contours.

Main Methods:

  • Cephalometric analysis of 56 pre-orthodontic patients with TMJ disorder symptoms.
  • Comparison of craniofacial structures between a bilateral condylar bone change (BBC) group and a no condylar bone change (NBC) group.

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  • Analysis of specific measurements including antegonial notch depth, ramus height, mandibular plane angle, and Sella-Articulare length.

    • Main Results:

    • The BBC group exhibited significantly greater antegonial and ramus notch depths, more retruded mandibles, shorter ramus heights, and larger mandibular plane angles compared to the NBC group.
    • BBC subjects with bilateral double contours showed significantly more retruded mandibles, larger antegonial notch depth, and shorter Sella-Articulare lengths than BBC subjects without double contours.
    • Significant correlations were found between double contours, mandibular morphology, and TMJ position.

    Conclusions:

    • The presence of double contours is associated with specific mandibular morphology in patients with TMJ disorders.
    • These findings highlight the importance of evaluating craniofacial structures in the context of TMJ health.
    • Double contours may serve as a radiographic indicator of altered mandibular morphology and TMJ positioning.