CHLORIDE-CONTAINING AND ALKALI-CONTAINING CALCIUM PHOSPHATES AS BASICMATERIALS TO PREPARE CALCIUM-PHOSPHATE CEMENTS

Combinations of an alkali-containing calcium phosphate-like rhenanite, sodium whitlockite or calcium potassium phosphate and a chloride-cont aining calcium phosphate-like spodiosite or chloroapatite with or with out additions of other calcium phosphates like monocalcium phosphate m onohydrate, dicalcium phosphate or dicalcium phosphate dihydrate were made and mixed with water into pastes. The setting time of these paste s was determined. After soaking for a day in Ringer's solution at 37 d egrees C the compressive strength and the diametral tensile strength w ere determined. Two of the combinations tried in this study resulted i n the formation of cements at room temperature. One cement was of the type dicalcium phosphate, whereas the other gave octocalcium phosphate as the solid reaction product. The byproducts formed were an aqueous solution of NaCl and one of K2HPO4, respectively. Applications for bon e repair and augmentation are envisaged.