Abstract: A ceramic device providing an environment for the promotion and formation of new bone. The ceramic device is made of a sinter of calcium phosphate compound, containing a plurality of perfect spherical pores whose diameter ranges from 10-450 .mu.m to provide a suitable environment for the formation of new bone. A plurality of micro pores is included whose diameter ranges from 0.01-0.5 .mu.m which surrounds the perfect spherical pores to interconnect the perfect spherical pores with an outer surface of the ceramic device with the micro pores interconnecting with each other.

Abstract: An artificial living body composite material comprising an artificial bone portion formed to a desired shape and size, and an inclusion membrane comprising an organic polymer material as a main constituent; optionally the artificial bone portion being composed of a base member and a coating layer.

Abstract: There is provided a structure of artificial bone for use in implanting or grafting bone comprising; a sintered body of calcium phosphate compounds; and hollowed minute tubes in said sintered body, having very small diameter, and extending along with a direction of Haversian canal extension of live organism, so as to produce two dimensional close-packed structure in said body, in form of cubic or hexagonal arrangement. The arrangement has in the sintered body of calcium phosphate compounds; hollowed minute tubes having a diameter of 0.1 to 2.0 mm, and the major portions thereof extending along with a direction of the Haversian canal extension, and producing a two dimensional close packed arrangement in said body against the face vertical to said direction, and being arranged with a separation, distance of 1.0 to 5.0 mm. The structure has preferably really spherical pores having diameter of 50 to 600 micrometer, and the porosity thereof being 0.5 to 40 percent.

Abstract: A sintered alumina article having an excellent flexural strength comprises numerous sintered plate crystalline corundum particles each having cleavage surface planes and accumulated on and bonded to each other in a manner such that the cleavage surface planes of the accumulated plate crystalline particles are substantially in parallel to each other and can be produced by forming the plate crystalline corundum particles into a predetermined shape so that the plate crystalline particles are accumulated in the above-mentioned manner; and by sintering the resultant precursory article at 1500.degree. C. or more under the ambient atmospheric pressure.

Abstract: A porous ceramic material composed of a sintered porous body of a calcium phosphate compound is described. A multiplicity of capillary void paths having a diameter of 1 to 30 .mu.m and a multiplicity of pores having a diameter of 1 to 600 .mu.m are formed in the sintered porous body. At least part of the pores are connected to the exterior space of the sintered porous body through at least a part of the capillary voids. The porous ceramic material is valuable as a medical material, e.g., a substitute or prosthesis for bone or dental root, and also an electronic material and a genetic engineering material.When the porous ceramic material is embedded in a bone defect of human or animals, osteolytic cells, osteoblasts, erythrocytes and body fluid are selectively allowed to intrude through the porous ceramic material while almost no intrusion of osteoclasts and collagen fibers is allowed.

Abstract: A porous ceramic material composed of a sintered porous body of a calcium phosphate compound is described. A multiplicity of capillary void paths having a diameter of 1 to 30 .mu.m and a multiplicity of pores having a diameter of 1 to 600 .mu.m are formed in the sintered porous body. At least part of the pores are connected to the exterior space of the sintered porous body through at least a part of the capillary voids. The porous ceramic material is valuable as a medical material, e.g., a substitute or prosthesis for bone or dental root, and also an electronic material and a genetic engineering material.When the porous ceramic material is embedded in a bone defect of human or animals, osteolytic cells, osteoblasts, erythrocytes and body fluid are selectively allowed to intrude through the porous ceramic material while almost no intrusion of osteoclasts and collagen fibers is allowed.

Abstract: A hardened cement material having enhanced flexural strength, heat resistance, and water resistance prepared from a cement composition comprising 100 parts by weight of a hydraulic cement material containing .gamma.-dicalcium silicate (.gamma.-C.sub.2 S) preferably in an amount of 1% by weight or more and 1 to 20 parts by weight of a water-dispersible polymeric material, and mixed with 5 to 25 parts by weight of water, by a molding procedure and by a heat-hardening procedure at a temperature of from 40.degree. C. to 180.degree. C. while controlling the relative humidity to 20% to 70% and/or applying a pressure of 5 to 15 atmospheres.