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Mandibular kinematics represented by a non-orthogonal floating axis joint coordinate system.
Joseph K Leader1, J Robert Boston, Richard E Debski
1Department of Radiology, University of Pittsburgh, Imaging Research Division, 300 Halket Street, Suite 4200, Pittsburgh, PA 15213, USA. jklst3@pitt.edu
Journal of Biomechanics
|January 28, 2003
Summary
This study introduces a new method for analyzing jaw movement (mandibular kinematics) using a clinician-friendly 3D model. The approach provides reproducible and accurate measurements of jaw motion, improving biomechanical analysis.
Area of Science:
- Biomechanics
- Medical Imaging
- Orthodontics
Background:
- Current methods for representing joint kinematics often rely on indirect measurements.
- Accurate analysis of mandibular kinematics is crucial for understanding jaw function and dysfunction.
Purpose of the Study:
- To develop and validate a novel, clinician-friendly method for representing mandibular kinematics.
- To establish a mathematically rigorous system for describing jaw motion using 3D geometric models and a floating axis coordinate system.
Main Methods:
- Constructed 3D geometric models of the mandible from MRI data.
- Utilized a non-orthogonal floating axis joint coordinate system.
- Registered kinematic data from fiducial markers with geometric models.
Main Results:
- Achieved reproducible measurements for most kinematic parameters across sessions.
- Identified a dominant motion plane with a linear correlation between sagittal rotation and translation (approx. 1.5 degrees/mm).
- Mean absolute maxima for sagittal rotation, coronal rotation, axial rotation, medial-lateral translation, anterior-posterior translation, and inferior-superior translation were 34.10°, 1.82°, 1.14°, 2.31 mm, 21.07 mm, and 6.95 mm, respectively.
Conclusions:
- The combined floating axis system and geometric models offer a succinct and reproducible method for describing mandibular kinematics.
- This novel approach yields clinician-friendly parameters for biomechanical analysis of jaw movement.