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MATRIX-MINERAL INTERACTION IN CALCIFIED TISSUES.
NEW YORK UNIV N Y COLL OF DENTISTRY
Epitactic overgrowth has been discounted as the factor responsible for the preferred orientation of apatite and other mineral salts in fibrous tissues. The precipitation diagram for the calcium-bicarbonate-phosphate system has been elaborated further to show the range of metastability and the effect of an increase in ionic strength and of elevated bicarbonate concentration on metastability of the solution and on the solubility of the precipitate. Presence of magnesium extends the field of the amorphous phase to lower calcium and higher phosphate concentrations. A scale suitable for describing in numerical terms the state of crystallinity of the precipitated materials was designed. It is an important device in the study of the effects which temperature, pH, and various impurities have on the crystallinity of the precipitate. A carbonate OH apatite has been prepared whose chemical analysis corresponds to a substitution of half of the phosphate groups by carbonate groups. Its short a-axis signifies the substitution. Author
Final progress rept., 15 Jun 62-30 Nov 63,