Title: Durapatite
CAS Registry Number: 1306-06-5
CAS Name: Hydroxylapatite
Additional Names: calcium phosphate hydroxide; calcium orthophosphate basic; hydroxyapatite
Trademarks: Alveograf; Ossopan; Periograf
Literature References: 3Ca3(PO4)2.Ca(OH)2 or Ca10(PO4)6(OH)2. Also considered as pentacalcium monohydroxyorthophosphate Ca5(OH)(PO4)3. Calcd as Ca10H2O26P6; Ca 39.89%, H 0.20%, O 41.41%, P 18.50%. Occurs as a mineral in phosphate rock. Constitutes the mineral portion of bone. Prepn from Ca(NO3)2 and KH2PO4: Warington, J. Chem. Soc. 26, 983 (1873); Rathje, Ber. 74, 342 (1941); Hayek in Handbook of Preparative Inorganic Chemistry, G. Brauer, Ed. (Academic Press, 2nd ed., 1963) p 545; from calcium phosphate, dibasic: Perloff, Posner, Inorg. Synth. 6, 16 (1960); from Ca(NO3)2.4H2O and (NH4)3PO4 plus NH4OH: Hayek, Newesely, ibid. 7, 63 (1963). Formation and structure of synthetic bone hydroxyapatites: A. S. Posner et al., Prog. Cryst. Growth Charact. 3, 3 (1980).
Properties: Hexagonal needles arranged in rosettes. Dec above 1100°. Practically insol in water, even when freshly prepd. Crystallographic data: a0 9.425; C0 6.935; C0/a0 0.736.
Use: Prosthetic aid (artificial bone and teeth).
Therap-Cat: Calcium supplement; phosphorus supplement.
Keywords: Replenishers/Supplements; Phosphorus.

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