| 摘要 |
PURPOSE:To give a bone cement component the self curing property, to lessen the harmfulness to the tissues of an organism and thus to improve the biocompatibility thereof, by adding a solution of a sodium or potassium salt to a mixture of certain powder and a carboxylic acid to form the bone cement component. CONSTITUTION:A solution of a sodium or potassium salt is added to a mixture of powder and a carboxylic acid containing two or more carboxyl groups to make a bone cement component. The solution of the sodium or potassium salt used above reacts with calcium to form an insoluble compound. The powder above includes tricalcium diphosphate [alpha-Ca3(PO4)2] and tetracalcium oxide diphosphate [Ca4O(PO4)2]. The powder of tricalcium diphosphate and tetracalcium oxide diphosphate is prepared by dehydrating and thermally decomposing a hydroxyapatite at a high temperature of 1,350 deg.C or higher and then by grinding it. The hydroxyapatite used contains calcium and phosphorus in the molar ratio of 1.66-1.68:1. The ratio of tricalcium diphosphate to tetracalcium oxide diphosphate mixed is 2:1. |
