Figure 11.

Chemical differences analyzed by FTIR: P-O bonds at 570–605 cm⁻¹ and 970–1100 cm⁻¹ as well as O-H bonds at ~3500 cm⁻¹ and 1650 cm⁻¹ were observed in all samples. cerabone^® and maxresorb^® showed additional hydroxyapatite O-H band around 3575 cm⁻¹. 1460 cm⁻¹, 1420 cm⁻¹, and 880 cm⁻¹ bands were observed for Bio-Oss^® and maxgraft^® due to presence of CO₃²⁻ that were not present in cerabone^® and maxresorb^®. maxgraft^® also had absorption bands at 1550 cm⁻¹ and 1245 cm⁻¹ corresponding to C-H and N-H bonds.