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J Dent Res 39(3): 608-618, 1960
© 1960 International and American Associations for Dental Research
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Measurement of the Physiological Mobility of Individual Teeth in an Axial Direction

GILBERT J. PARFITT 1

1 School of Dentistry, University of Alabama, Birmingham, Alabama

1. A machine for the measurement of the physiological mobility of teeth, suitable for clinical use, is described. This machine utilizes rectilinear transducers and is capable of measuring axial tooth movements with an accuracy of 0.001 mm. ± 7 per cent and, simultaneously, the force applied to the tooth. The time of displacement and of recovery of position of the tooth when force is removed or varied is also recorded.

2. Calibration of the machine is described.

3. Clinical measurements on one individual over a period of 12 months show that the tooth is supported by several distinct and independently variable systems. Two systems behave like displaceable fluids, and one like an elastic material.

4. Variations in mobility are described and discussed.

5. Similar force-movement curves were obtained on the teeth of several individuals.

Submitted on November 27, 1959




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