Zinc oxide-based cements are commonly used to fill dental canals, but they have drawbacks such as poor bonding and bacterial infection. In this work, we propose a novel phosphocalcic apatitic cement/oxygenated apatite mixture, which can mimic the natural filling of dental canals. Oxygenated apatite is a type of apatite that contains molecular oxygen in their tunnels. We aim to evaluate the effect of the Calcium/Phosphorus (Ca/P) atomic ratio on the chemical and structural properties of the synthesized oxygenated apatite, as well as on the quantity of oxygen retained in their tunnels. We use the neutralization method to precipitate apatite from lime milk and orthophosphoric acid, in the presence of hydrogen peroxide. We characterize the materials the materials by X-ray diffraction, infrared absorption spectroscopy, thermal analysis, adsorption-desorption of nitrogen, and elemental analysis. We obtain simple oxygenated apatitic phases with a Ca/P ratio ranging from 1.53 to 1.76, an oxygen insertion rate of 3.5x10-4 moles, and a chemical formula of Ca9,9(PO4)6(OH)2(O2)0,69(CO2)0,01. We find that the deviation from stoichiometry and calcination at 900°C lead to the formation of a biphasic mixture of PAH/β-TCP. The synthesized apatites have low crystallinity and high specific surface area, which decreases from 156.3 to 141.6 m2/g as the Ca/P ratio increases
