Prosthetic teeth and bones

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.m inside the surface of the prosthetic teeth and bones, and said composite material being a laminate of said fibrous material interposed between two layers of said fine powder and having been cold compression-molded and then sintered.