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J Dent Res 19(4): 413-423, 1940
© 1940 International and American Associations for Dental Research
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CHEMICAL ANALYSES OF DECIDUOUS ENAMEL AND DENTIN

M. J. BIRD B.A.1, ETHEL L. FRENCH PH.D.1, MARIAN R. WOODSIDE B.A.1, MARTHA I. MORRISON 1, and HAROLD C. HODGE PH.D.1

1 Department of Biochemistry and Pharmacology, School of Medicine and Dentistry, and the Department of Chemistry, College of Arts and Science, the University of Rochester, Rochester, N. Y.

1. The composition of deciduous teeth is very similar to that of adult teeth.

2. The calcium/phosphorus ratio of the inorganic part of deciduous teeth falls between those for fetal and adult teeth, indicating that the principal inorganic molecule is probably the same (hydroxylapatite) in each.

3. Calcium/phosphorus ratios are 2.06 for deciduous enamel and 2.08 for deciduous dentin.

4. Normal values for deciduous teeth are as follows: moisture, enamel 2.8 per cent, dentin 11.1 per cent; organic matter, enamel 4.9 per cent, dentin 24.0 per cent; calcium, enamel 36.0 per cent, dentin 33.3 per cent; phosphorus, enamel 17.8 per cent, dentin 16.5 per cent.

5. Deciduous enamel and dentin composition does not vary significantly when teeth are classified according to caries class, tooth location, age and sex of subject.






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