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متالوژی::
هیدروکسی آپاتیت
HA: hydroxyapatite; HCA: hydroxy- carbonate apatite; A-W: apatite-wollastonite; TCP: tricalcium phosphate; OCP: octacalcium phosphate; DCPA: dicalcium phosphate anhydrous; DCPD: dicalcium phosphate dehydrate; TetCP: tetracalcium phosphate monoxide.
The most representative examples of bioactive ceramics are calcium phosphates, such as hydroxyapatite, and certain compositions of glasses and glass-ceramics (Vallet-Reg� 2006; Vallet-Reg�, Ragel, and Salinas 2003; Hench and Wilson 1984; H.
Thus there are crystalline ceramics such as crystalline hydroxyapatite; amorphous solids, such as glasses; and intermediates, such as glass-ceramics, which are formed by an amorphous glassy matrix with crystallization nuclei.
Apatite refers to a certain group of calcium phosphates, hydroxyapatite, fluorapatite, chlorapatite, and bromapatite, which present high concentrations of OH-, F-, Cl-, or Br- ions, respectively, in the crystal.
In this sense, hydroxyapatite with hexago- nal symmetry is biocompatible, bioactive, and osteoinductive.
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