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A precise and useful method for coordinating computed tomography and jaw movement frames of reference.

Akiko Hosogai¹, Toyohiko Hayashi, Shoji Kohno

¹Division of Removable Prosthodontics, Department of Oral Biological Science, Section for Oral Life Science, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan. hosogai@dent.niigata-u.ac.jp

Nihon Hotetsu Shika Gakkai Zasshi

|November 28, 2008

Summary

This study developed a method to precisely analyze 3-D condylar movements by coordinating helical computed tomography (CT) data with six-degrees-of-freedom (6-DOF) jaw movement analysis. The multi-point approach offers accurate condylar motion analysis, crucial for understanding complex jaw dynamics.

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Area of Science:

Biomedical Engineering
Medical Imaging
Biomechanics

Background:

Accurate 3D analysis of temporomandibular joint (TMJ) condylar movement is essential for diagnosing and treating jaw disorders.
Existing methods may lack precision in correlating morphological data with dynamic jaw motion.

Purpose of the Study:

To develop a system for coordinating 3D helical CT morphological data with 6-DOF jaw movement data.
To enable multi-point movement analysis of the TMJ condyle.

Main Methods:

Utilized a customized facebow to integrate CT-derived morphology with 6-DOF jaw movement recordings.
Computed total uncertainty according to ISO standards.
Visualized working condyle trajectory during lateral excursion to demonstrate multi-point analysis.

Main Results:

Achieved an overall uncertainty of 0.38 mm (antero-posterior), 0.19 mm (lateromedial), and 0.50 mm (supero-inferior) at the condylar center (95% coverage).
Demonstrated the feasibility of precise 3D condylar movement analysis.

Conclusions:

Developed a clinically operable system using facebow-based X-ray markers to correlate helical CT and 6-DOF jaw movement systems.
A multi-point approach is superior for precise 3D condylar movement analysis, minimizing the impact of measurement errors.