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Precision of the jaw tracking system JAWS-3D
R L Airoldi1, L M Gallo, S Palla
1Department of Masticatory Disorders and Complete Dentures, Dental School, University of Zurich, Switzerland.
Journal of Orofacial Pain
|January 1, 1994
Summary
The JAWS-3D jaw-tracking system
Area of Science:
- Biomedical Engineering
- Biomechanics
- Optoelectronics
Background:
- Accurate jaw movement tracking is crucial for diagnosing and treating various dental and neurological conditions.
- Existing systems face challenges in precision and reliability, necessitating rigorous evaluation.
Purpose of the Study:
- To evaluate the noise level and accuracy of the JAWS-3D optoelectronic jaw-tracking system.
- To assess the system's performance in measuring mandibular positions, angles, and velocities under laboratory conditions.
Main Methods:
- Laboratory-based noise level measurement of the JAWS-3D system.
- Accuracy assessment of position, angle, and velocity measurements using extraoral landmarks.
Main Results:
- JAWS-3D accuracy decreased with increased distance from extraoral landmarks (0.11% near, 1.33% far).
- Maximum angular error was 0.7 degrees.
- Velocity error was minimal (3 mm/s up to 80 mm/s) but increased significantly at higher speeds (26 mm/s at 210 mm/s).
Conclusions:
- The JAWS-3D system demonstrates good accuracy for jaw tracking, particularly for points closer to landmarks.
- The system's velocity measurement accuracy is reliable for moderate speeds but requires consideration for high-speed movements.