Patents Assigned to Haruyuki Kawahara
-
Patent number: 5167502Abstract: An endosseous implant having a mesh pore structure including at least an embedding portion to be embedded in a living bone tissue, the embedding portion containing any one of a single sheet of platelike body itself and a desired shape of body obtained by working the platelike body, the platelike body comprising any one of a single metal mesh sheet and a laminate of a plurality of metal mesh sheets formed into one body by mechanical bonding or by sintering, the laminate having a multiplicity of mesh pores passing through the embedding portion, whereby the embedding portion provides a mesh pore structure adapted to permit into the mesh pores the ingrowth and penetration of a fibrous tissue alone out of three kinds of bone, osteoid, and fibrous tissues or not less than two tissues inclusive of the fibrous tissue.Type: GrantFiled: June 18, 1991Date of Patent: December 1, 1992Assignees: Haruyuki Kawahara, Toho Titanium Co.Inventors: Haruyuki Kawahara, Katsumi Tanaka, Yasuyuki Ashiura, Motonobu Yoshimura
-
Patent number: 4964801Abstract: An endosseous implant including at least an embedding portion to be embedded in a living tissue, the embedding portion comprising any of a platelike body itself and a desired shape of body obtained by working the platelike body, the platelike body having orderly or disorderly a plurality of substantially straight tubular channels passing through the thickness of the platelike body for permitting the ingrowth and penetration of the adjacent bone tissue therein, the tubular channels including at least two kinds of three different pore diameters of large, medium, and small pore diameters respectively for permitting the ingrowth and penetration of a bone tissue, osteoid tissue, and fibrous tissue, whereby a polycapillary structure is built by the ingrowth and penetration of the at least two of the three kinds of tissues which pass through the thickness of the platelike body after the implantation.Type: GrantFiled: October 20, 1989Date of Patent: October 23, 1990Assignees: Haruyuki Kawahara, Toho Titanium Co., Ltd.Inventors: Haruyuki Kawahara, Katsumi Tanaka, Yasuyuki Ashiura, Motonobu Yoshimura
-
Patent number: 4957819Abstract: A frameless and coreless porous endosseous implant comprising a porous sintered metal layer (2) having a range of relatively large pores and porous sintered metal layers having a range of relatively small pores and laminated into one body by sintering integrally with the layer on either side thereof, or a porous singered metal layer having a range of relatively small pores and porous sintered metal layers having a range of relatively large pores and laminated into one body by sintering integrally with the layer on either side thereof, whereby the three layers each permit the ingrowth and penetration out of two or more kinds out of fibrous tissue, osteoid tissue and bone tissue in the pores thereof.Type: GrantFiled: May 30, 1989Date of Patent: September 18, 1990Assignees: Haruyuki Kawahara, Toho Titanium Co., Ltd.Inventors: Haruyuki Kawahara, Seiichi Tsukamoto, Yutaka Nomura, Katsumi Tanaka, Yasuyuki Ashiura, Motonobu Yoshimura
-
Patent number: 4904448Abstract: A patch test material for the detection of metal allergies which contains a dental metal, noble or base, with which an allergic reaction aid such as a biological high molecular weight compound, e.g., a protein is present.Type: GrantFiled: July 22, 1988Date of Patent: February 27, 1990Assignees: G-C Dental Industrial Corp., Haruyuki KawaharaInventor: Haruyuki Kawahara
-
Patent number: 4842517Abstract: An endosseous implant having a mesh pore structure including at least an embedding portion to be embedded in a living bone tissue, the embedding portion being a single sheet of a platelike body or a desired shape of body obtained by working the platelike body. The platelike body can be a single metal mesh sheet or a laminate of a plurality of metal mesh sheets formed into one body by mechanical bonding or by sintering, the laminate having a multiplicity of mesh pores passing through the embedding portion, whereby the embedding portion provides a mesh pore structure adapted to permit into the mesh pores the ingrowth and penetration of a fibrous tissue along out of three kinds of bone, osteoid, and fibrous tissues or not less than two tissues inclusive of the fibrous tissue.Type: GrantFiled: September 30, 1987Date of Patent: June 27, 1989Assignees: Haruyuki Kawahara, Toho Titanium Co., Ltd.Inventors: Haruyuki Kawahara, Katsumi Tanaka, Yasuyuki Ashiura, Motonobu Yoshimura
-
Patent number: 4738622Abstract: The specification discloses a removable denture retaining structure in which an elastic mounting member is provided between a denture body and a support base. This structure can obviate all problems of the prior art, i.e. many parts are required, skilled technique is also required to produce, mount and dismount the denture body, and looseness and breakage due to fatigue are apt to occur. Furthermore, the invention is advantageous because the structure can provide patients with comfortable feeling during use.Type: GrantFiled: July 24, 1986Date of Patent: April 19, 1988Assignees: Wada Seimitsu Shiken Kabushiki Kaisha, Nippon Maktron Kabushiki Kaish, Haruyuki KawaharaInventors: Haruyuki Kawahara, Hiroki Wada, Takashi Tsutsumi, Ikuya Matsuo
-
Patent number: 4731020Abstract: The specification discloses a removable denture retaining structure in which an elastic mounting member is provided between a denture body and an support base.This structure can obviate all problems of the prior art, i.e. many parts are required, skilled technique is also required to produce, mount and dismount the denture body, and looseness and breakage due to fatigue are apt to occur.Furthermore, the invention is advantageous because the structure can provide patients with comfortable feeling during use.Type: GrantFiled: July 24, 1986Date of Patent: March 15, 1988Assignees: Wada Seimitsu Shiken Kabushiki Kaisha, Nippon Mektron Kabushiki Kaisha, Haruyuki KawaharaInventors: Haruyuki Kawahara, Hiroki Wada, Takashi Tsutsumi, Ikuya Matsuo
-
Patent number: 4689080Abstract: This invention relates to a base material composition for dental treatment comprising 100 parts by weight of alumina cement powder, 1-50 parts by weight of calcium type powder hardening retarder, and 1-20 parts by weight of hardening retarder for restraining dispersion of calcium ion. This composition has appropriate hardening time and consistency, and is higher in strength and lower in solubility. The composition gets hardened by low alkalinity and is very low in tissue irritation.Type: GrantFiled: September 19, 1986Date of Patent: August 25, 1987Assignee: Haruyuki KawaharaInventors: Haruyuki Kawahara, Shoji Takeda
-
Patent number: 4652593Abstract: A dental cement composition consisting of a composition A and a composition B,said composition A comprising (a) 100 parts by weight of a powder containing 20 to 70% by weight of calcium oxide and 30 to less than 80% by weight of aluminum oxide, said powder being coated on the surface with a water-soluble high-molecular substance, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, andsaid composition B comprising an aqueous solution containing 0.01 to 70% by weight of a water-soluble high-molecular substance.Type: GrantFiled: February 12, 1986Date of Patent: March 24, 1987Assignees: G-C Dental Industrial Corp., Haruyuki KawaharaInventors: Haruyuki Kawahara, Shoji Takeda, Hiroshi Oshima, Kentaro Tomioka, Shoji Akahane, Eiichi Yoshii, Kazuo Hirota
-
Patent number: 4647600Abstract: A dental cement composition consisting of a composition A and a composition B,said composition A comprising at least two powders, (a) 100 parts by weight of a powder containing more than 20% by weight to 70% by weight of calcium oxide and 30% by weight to less than 80% by weight of aluminium oxide and treated on the surface with 0.01 to 5% by weight of at least one selected from the group consisting organic acids and/or inorganic acids, and (b) 2 to 70 parts by weight of a calcium hydroxide powder, andsaid composition B comprising of an aqueous solution containing 0.01 to 70% by weight of a water-soluble high-molecular substance.Type: GrantFiled: February 12, 1986Date of Patent: March 3, 1987Assignees: G-C Dental Industrial Corp., Haruyuki KawaharaInventors: Haruyuki Kawahara, Shoji Takeda, Hiroshi Oshima, Kentaro Tomioka, Shoji Akahane, Eiichi Yoshii, Kazuo Hirota