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1 The Departments of Anatomy, College of Dentistry and The Graduate School of Arts and Science, New York University, New York, N. Y.
1. A study of the relative amount of radioactive phosphorus which is absorbed by enamel and different topographic and morphological varieties of dentin has been ascertained.
2. Both in vitro and in vivo preparations show a direct relationship between variation in the morphology of dentin and the absorption of radioactive phosphorus. It has also been shown that the absorption of P32 is inversely related to the density of the dentin.
3. The relative amounts of P32 absorbed under conditions of in vivo and in vitro experimentation were observed to be similar for the enamel and the several topographical and morphological varieties of dentin which were studied.
Submitted on October 30, 1944
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