Table 1.
Main calcium phosphate (CP) compounds used as bone substitutes and their Ca/P ratio [29].
| Compound | Chemical Formula | Ca/P Ratio |
|---|---|---|
| Dicalcium phosphate anhydrous (DCPA) | CaHPO4 | 1 |
| Dicalcium phosphate dihydrate (DCPD) | CaHPO4·H2O | 1 |
| Amorphous calcium phosphate (ACP) | CaxHy(PO4)z·nH2O n = 3–4.5; 15–20% H2O |
1.2–2.2 |
| α-Tricalcium phosphate (α-TCP) | α-Ca3(PO4)2 | 1.5 |
| β-Tricalcium phosphate (β-TCP) | β-Ca3(PO4)2 | 1.5 |
| Calcium deficient hydroxyapatite (CDHA) | Ca10−x(HPO4)x(PO4)6−x(OH)2−x | 1.5–1.67 |
| Hydroxyapatite (HA) | Ca10(PO4)6(OH)2 | 1.67 |
| Tetracalcium phosphate (TTCP) | CaO·Ca3(PO4)2 | 2.0 |