Leicester, H.M.: Biochemistry of the Teeth, St. Louis, 1949, The C. V. Mosby Co., ch. 1, p. 31.
2.
Brudevold, F., and Steadman, L. T.: Unpublished data.
3.
Manly, R.S., and Bibby, B.G.: Substances Capable of Decreasing the Acid Solubility of Tooth Enamel, J. D. Res. 28: 160, 1949.
4.
Miller, W.D. : Deposits Upon Teeth With Special Reference to Green and Metallic Deposits, D. Cosmos36: 253, 1894.
5.
Ayers, P.: Green Stains, J. A. D. A. 26: 3, 1939.
6.
Leung, Wah S.: Naturally Occurring Stains on the Teeth of Children, J. A. D. A. 41: 191, 1950.
7.
Shay, D.E., Haddox, J.H., and Richmond, J.L.: An Inorganic Qualitative and Quantitative Analysis of Green Stain, J. A. D. A. 50: 156, 1955.
8.
Shapiro, M., and Hood, J.S.: Discoloration of Gingiva and Teeth by Stannous Fluoride, J. California D. A. & Nevada D. Soc. 32: 174, 1956.
9.
Brudevold, F. , Steadman, L.T., Gardner, D.E., Rowley, J., and Little, M.F.: Uptake of Tin and Fluoride by Intact Enamel , J. A. D. A. 53: 159, 1956.
10.
Leach, A.E., and Winton, A.L.: Food Inspection and Analysis, New York, 1941, John Wiley and Sons, Inc., ch. 18, p. 897.
11.
Kehoe, R.A. , Cholak, J., and Story, R.V.: A Spectrochemical Study of the Normal Ranges of Concentration of Certain Trace Metals in Biological Materials, J. Nutrition19: 579, 1940.
12.
West, E.S., and Todd, W.R.: Textbook of Biochemistry, New York, 1955, The Macmillan Co., ch. 28, p..1201.
13.
Brudevold, F., and Steadman, L.T.: A Study of Copper in Human Enamel, J. D. Res. 34: 209, 1955.
14.
Brudevold, F., and Steadman, L.T.: The Distribution of Lead in Human Enamel , J. D. Res. 35: 430, 1956.
15.
Howell, C.L. , Gish, C., Smiley, R., and Muhler, J.C.: The Effect of Topically Applied Stannous Fluoride on the Dental Caries Experience in Children, J. A. D. A. 50: 14, 1955.