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J Dent Res 18(3): 203-211, 1939
© 1939 International and American Associations for Dental Research
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DENSITY AND REFRACTIVE INDEX STUDIES OF DENTAL HARD TISSUES

II. DENSITY DISTRIBUTION CURVES

RICHARD S. MANLY PH.D.1, HAROLD C. HODGE PH.D.1, and LOUISE E. ANGE B.A.1

1 Department of Biochemistry and Pharmacology, School of Medicine and Dentistry, The University of Rochester, Rochester, New York

1. The density distribution curves of enamel, dentin and cementum were investigated by a centrifugal flotation method.

2. Ninety per cent of dried enamel has a density between 2.89 and 3.00 grams per cc., with the 2 maxima in the distribution curve at 2.91 and 2.97.

3. The density of air-dried dentin was found to occur between 2.00 and 2.30 with a mean density at 2.14 grams per cc.

4. Most of the cementum exhibited a density of from 2.01 to 2.05 grams per cc.




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