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1 Materials Division, Rensselaer Polytechnic Institute, Troy, New York 12181, USA
An electron probe microanalyzer was used to determine compositional variations of the Ca/P ratio in the core and sheath areas of individual rods in human enamel. The Ca/P ratio in the core is that of a calcium-deficient hydroxyapatite, whereas the ratio in the sheath is that of almost stoichiometric apatite. Treatment with HCl or EDTA alters the Ca/P ratio in the core and the sheath.
Submitted on April 25, 1972
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