Abstract: Prosthetic teeth and bones having superior affinity for the living body and having a compression strength of about 4.times.10.sup.-3 kg/cm.sup.2 or higher and a flexural strength of about 2.7.times.10.sup.3 kg/cm.sup.2 or higher, which comprise a composite material comprising(a) a sufficiently fine powder having an average particle size of about 2 .mu.m or less comprising at least 50% by weight of Ca.sub.10 (PO.sub.4).sub.6 (OH).sub.2 and not more than about 50% by weight of at least one additive selected from the group consisting of Ca.sub.3 (PO.sub.4).sub.2, AlPO.sub.4, Al.sub.2 O.sub.3, AlF.sub.3, SiO.sub.2, Mg(PO.sub.4).sub.2, and the fluorides, chlorides and oxides of Li, Na, K, Mg and Ca, and(b) at least one fibrous material having the coefficient of thermal expansion nearly equal to or slightly lower than that of the hydroxy-apatite selected from the group consisting of fibers, fine filaments and metal whiskers, ceramics or glass,said fibrous material being present at least 50 .mu.

Abstract: A sintered apatite body obtained by molding and sintering an apatite powder, Ca.sub.5 (PO.sub.4).sub.3 OH, containing 0.01 to 20% by weight of (Ca,Mg).sub.3 (PO.sub.4).sub.2. The sintered apatite body has high mechanical strength and good affinity with living tissues and cells, and is suitable as medical implant materials such as prosthetic teeth or bones.

Abstract: A sintered apatite body obtained by molding and sintering an apatite powder, Ca.sub.5 (PO.sub.4).sub.3 OH, containing 0.01 to 20% by weight of (Ca,Mg).sub.3 (PO.sub.4).sub.2. The sintered apatite body has high mechanical strength and good affinity with living tissues and cells, and is suitable as medical implant materials such as prosthetic teeth or bones.