PURPOSE: To obtain a high-density sintered apatite compact according to ordinary sintering by dropping a phosphoric acid compound into an aqueous solution or suspension of a calcium compound so as to satisfy a specific Ca/P ratio.
CONSTITUTION: An aqueous solution of a phosphoric acid compound is dropped into an aqueous solution or suspension of a calcium compound and reacted therewith to produce apatite. In the process, the aqueous solution of the calcium compound is dropped so as to provide a Ca/P ratio within the range of >1.67 and ≤1.76. For example, phosphoric acid, potassium dihydrogenphosphate and ammonium hydrogenphosphate are cited as the phosphoric acid compound and, e.g. calcium hydroxide, calcium chloride and calcium nitrate are cited as the calcium compound.
TANIGUCHI YUKIO
AKIYAMA HITOSHI
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