Calcium phosphate sintered particles and production method therefor

A ceramic particle group containing a ceramic particle, wherein:

• the ceramic particle has a particle diameter within a range of 10 nm to 700 nm;
• the ceramic particle is a calcium phosphate sintered body particle;
• the ceramic particle contains no calcium carbonate;
• and
• the ceramic particle satisfies the following property (A):
• (A) the ceramic particle group shows a reduction in weight of 2% or less in a temperature range of 25° C. to 200° C. when sufficiently dried, left to stand for 3 days or more under conditions of normal pressure, a temperature of 25° C., and a humidity of 50%, and then measured for the weight under conditions of a nitrogen stream and 10° C./min by using a thermogravimetric differential thermal analyzer (TG-DTA, EXSTAR6000 manufactured by Seiko Instruments Inc.).

A ceramic particle group containing a ceramic particle, wherein:

• the ceramic particle has a particle diameter within a range of 10 nm to 700 nm;
• the ceramic particle is a calcium phosphate sintered body particle;
• the ceramic particle contains no calcium carbonate;
• and
• the ceramic particle contains B type carbonate apatite.