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Radiographic analysis for jaw motion normalization.

Jeremy J Lemoine1, James J Xia, Jaime Gateno

  • 1Department of Bioengineering, Rice University, Houston, TX 77251, USA.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|July 9, 2005
PubMed
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This study accurately determined the mandible's center of rotation using a custom algorithm. Jaw motion characteristics correlate with mandibular geometry, specifically the rotational arm length, influencing opening mechanics.

Area of Science:

  • Biomechanical analysis of human jaw movement.
  • Computational anatomy and kinematics.

Background:

  • Understanding the mandible's center of rotation is crucial for analyzing jaw function.
  • Previous methods for determining this center have limitations.

Purpose of the Study:

  • To evaluate the physical location of the mandible's center of rotation using a custom algorithm.
  • To compare the calculated center of rotation with the geometric center of the condylar head.
  • To investigate correlations between jaw motion characteristics and mandibular geometry.

Main Methods:

  • Lateral cephalometric radiographs of 9 subjects were analyzed.
  • A custom algorithm calculated the center of rotation for each mandible.
  • Circular templates identified the geometric center of the condyle.

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  • Measurements of mandibular geometry were correlated with motion parameters.

    • Main Results:

    • All calculated centers of rotation were located within the condylar head.
    • The average difference between calculated and geometric centers was 2.87 mm.
    • The length of the mandibular rotational arm correlated with rotational and translational motion, but other parameters did not.

    Conclusions:

    • Mandibular motion analysis accurately determines the center of rotation.
    • Jaw opening involves distinct phases of rotation and translation, varying between individuals.
    • Mandibular geometry, particularly rotational arm length, influences jaw opening mechanics, creating a natural compensatory mechanism.