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Journal of Dental Research, Vol 64, 2-5, Copyright © 1985 by International & American Associations for Dental Research Online Journals

ARTICLES

Hydrolysis of dicalcium phosphate dihydrate in the presence or absence of calcium fluoride

M. S. Tung, L. C. Chow and W. E. Brown

Effects of temperature (25 and 37 degrees C), pH (4.9-10.5), and CaF2 on CaHPO4.2H2O (DCPD) hydrolysis were studied in a pH-stat. Octa-calcium phosphate (OCP) was the product at pH 6.2-6.8 and 25-37 degrees C; thermodynamically stable apatitic compounds were formed at higher pH and/or higher temperature. In the presence of CaF2, apatite was the product, its crystallinity improved, and the fluoride content increased as pH of the reaction decreased. The results demonstrate the remarkable ability of fluoride to promote the hydrolysis of an acidic calcium phosphate, DCPD, to apatite.




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