Method for producing calcium phosphate molded article, calcium phosphate molded article, and material for transplantation

A calcium phosphate molded article formed from calcium phosphate,

• the molded article having holes communicating with the external space, having a specific gravity of 0.7 g/mL or higher and/or a porosity according to a mercury infusion method of 75% or lower, and having a water absorption infiltration rate of 0.05 mm/second or higher:
• provided that the water absorption infiltration rate is measured under the following conditions:
• an experiment system is established, in which one end of a plastic cylinder having an inner diameter of 2 mm is connected to a calcium phosphate molded article having a diameter of 8 mm and a height of 20 mm, the other end of the plastic cylinder is connected to one end of a tube having a length of 100 mm, and the other end of the tube is connected to a 10-mL syringe;
• under the conditions regulated such that the height at which the calcium phosphate molded article is contacted with the plastic cylinder, and the height of the level of ink contained in the syringe are maintained equal from the initiation to the completion of water absorption and infiltration, the ink in the syringe is subjected to absorption and infiltration into the calcium phosphate molded article;
• in a case in which the height of the region infiltrated by the ink in the calcium phosphate molded article reaches 15 mm within 5 minutes, a value obtained by dividing 15 mm by the time required for infiltration is defined as the water absorption infiltration rate;
• and in a case in which the height of the region infiltrated by the ink in the calcium phosphate molded article does not reach 15 mm within 5 minutes, a value obtained by dividing the height of the region infiltrated by the ink in the calcium phosphate molded article at the time point of 5 minutes, by 5 minutes, which is the time required for infiltration, is defined as the water absorption infiltration rate.