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The measurement of physiological tooth displacement in function
1Department of Prosthodontics II, Faculty of Dentistry, Tokyo Medical and Dental University, Japan.
Journal of Medical and Dental Sciences
|February 24, 2001
Summary
This study measured physiological tooth displacement using a novel transducer. Findings reveal specific directions and magnitudes of molar movement during clenching and mastication.
Area of Science:
- Biomedical Engineering
- Dental Biomechanics
- Physiology
Background:
- Understanding physiological tooth displacement is crucial for dental biomechanics and treatment planning.
- Previous methods for measuring in vivo tooth movement have limitations in accuracy and scope.
Purpose of the Study:
- To investigate the three-dimensional physiological tooth displacement of upper and lower first molars during function.
- To develop and validate a new device for measuring dynamic tooth movements.
Main Methods:
- A novel tooth displacement transducer (Type M-3) utilizing magnesensors was developed, weighing 48.7g with minimal measuring pressure (<0.4g).
- The transducer was affixed to the labial surface of anterior teeth via a paraocclusal splint.
- Three-dimensional displacements of the upper and lower left first molars were recorded during clenching and mastication, with a linearity error <2% within +/-200 microm.
Main Results:
- During clenching, the upper left first molar displaced palatally and apically (40-136 microm), while the lower left first molar displaced apically and lingually (29-65 microm).
- During mastication, the upper left first molar showed palatal and apical displacement (68-79 microm), with initial apical then labial movement.
- Mastication also induced lingual (11-71 microm) and buccal (17-39 microm) displacement in the lower left first molar.
Conclusions:
- The developed transducer accurately measures physiological tooth displacement in three dimensions during function.
- Distinct patterns of molar displacement occur during clenching and mastication, providing valuable biomechanical data.
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