Bone replacement material with orthophosphate

A bone replacement material with orthophosphate, characterized in that

• a) according to 31P-NMR measurements, the bone replacement material comprises Q0-groups of orthophosphate and Q1-groups of diphosphate, the orthophosphates or Q0-groups making up 65 to 99.9% by weight relative to the total phosphorus content of the finished material and the diphosphates or Q1-groups making up 0.1 to 35% by weight relative to the total phosphorus content of the finished material, and
• b) according to X-ray diffractometric measurements and relative to the total weight of the finished material, 35 to 99.9% by weight of a main crystal phase consisting of Ca10Na(PO4)7, Ca10K(PO4)7, mixtures thereof or mixed crystals according to the general formula Ca10KxNa1−x (PO4)7, where x=0 to 1, is contained in the bone replacement material and 0.1 to 25% by weight of a substance selected from the group consisting of Na2CaP2O7, K2CaP2O7, Ca2P2O7 and mixtures thereof is contained as a secondary crystal phase, and
• c) the X-ray amorphous phases contained besides the main crystal phase jointly make up 0.1 to 65% by weight relative to the total weight of the finished material, obtainable by
• mixing raw materials containing (in % by weight) 25-50 CaO, 1-20 Na2O, 0.5-20 K2O, 0-13 MgO and 0-10 SiO2 and treating the aforesaid mixture with H3PO4 in an amount corresponding to 30-55 P2O5, SiO2 or MgO or a mixture thereof making up at least 1% by weight, homogenizing and drying the mixture and subjecting it to a step-by-step thermal treatment lasting 1-2 h at 350-450° C., 750-850° C. and 950-1,050° C. respectively, melting the mixture at between 1,550 and 1,650° C., holding it at the melting temperature for between 10 and 60 minutes and finally cooling the mixture in a spontaneous or temperature-controlled manner, grinding it, if necessary, and sintering it to obtain moulded bodies.

A glass used as a sintering aid for resorbable materials comprising calcium phosphates with the exception of β-tricalcium phosphate, wherein the chemical composition in % by weight is:

• SiO2;
• 73-78;
• MgO:
• 8-11;
• Na2O:
• 12-19;
• K2O:
• 0-22;
• P2O5:
• 0-20.