# US 5,702,252 A · Thermally stabilized casting core > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,702,252 A - Document ID: US5702252A - Status: Granted - Kind: A - Application number: 08/396,758 - Filed: 1995-03-01 - Granted: 1997-12-30 - Earliest claimed: 1995-03-01 - Assignees: Implant Innovations, Inc. - Inventors: Dan Paul Rogers; Edward Freer Smith, III - Web page: https://patentgrep.com/patent/US5702252A ## CPC - A61C 8/005: {Connecting devices for joining an upper structure with an implant member, e.g. spacers} - A61C 8/006: {with polygonal positional means, e.g. hexagonal or octagonal} - A61C: DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE (non-driven toothbrushes A46B; {tongue scrapers A61B17/24;} preparations for dentistry A61K6/00; preparations for cleaning the teeth or mouth A61K8/00, A61Q11/00) ## Abstract A gold abutment for receiving a cast metal substrate of an artificial tooth has a non-rotational (hexagonal) socket in its base. To prevent distorting the socket in the casting process the base is provided with an annular groove. Larger than usual base diameters can be used with no noticeable distortion of the socket. ## Claims ### Claim 1 A unitary core having a generally annular base part and a generally tubular mounting part arrayed endwise with a common passage through them, said core intended to support a body formed on its exterior from molten metal, said passage terminating in a recessed socket within said base part for connecting said core anti-rotationally to an implant, said base part having a larger external diameter than said mounting part, providing a substantially annular shelf extending radially outward relative to said mounting part in the vicinity of the junction betwen said two parts, and distortion relief means in said base part for minimizing shape distortion of said recessed socket resulting from contact with said molten metal. ### Claim 2 (depends on 1) A core according to claim 1 in which said distortion relief means is substantially a groove. ### Claim 3 (depends on 2) A core according to claim 2 in which said groove opens through said shelf. ### Claim 4 (depends on 2) A core according to claim 2 in which said groove is axially oriented. ### Claim 5 (depends on 4) A core according to claim 4 and said body formed on it in contact with said mounting part and said shelf and substantially filling said groove. ### Claim 6 (depends on 2) A core according to claim 2 in which said distortion relief means is a substantially continuous annular groove. ### Claim 7 (depends on 6) A core according to claim 6 in which said groove is axially oriented. ### Claim 8 (depends on 6) A core according to claim 6 in which said groove opens through said shelf. ### Claim 9 (depends on 8) A core according to claim 8 and said body formed on it in contact with said mounting part and said shelf and substantially filling said groove. ### Claim 10 (depends on 1) A core according to claim 1 in which said passage terminates through said base in a socket for matingly engaging another article so as to attach said core to said other article. ### Claim 11 (depends on 10) A core according to claim 10 including means to affix said core to said other article. ### Claim 12 (depends on 1) A core according to claim 1 and said body formed on it in contact with said mounting part and said shelf. ### Claim 13 A unitary core having a generally annular base part and a generally tubular mounting part arrayed endwise with a common passage through them, said passage terminating through said base in a socket for matingly engaging another article so as to attach said core to said other article, said socket having a non-round shape transverse to said passage, said core intended to support a body formed on its exterior from molten metal, said base part having a larger external diameter than said mounting part, providing a substantially annular shelf extending radially outward relative to said mounting part in the vicinity of the junction betwen said two parts, and distortion relief means in said base part for minimizing shape distortion of said base part resulting from contact with said molten metal. ### Claim 14 In combination, a core and a body cast on the exterior of said core from molten metal, said core having a generally annular shape and a recessed socket at one end for engaging an implant, said core including distortion relief means at said one end for minimizing shape distortion of said socket resulting from contact with said molten metal. ### Claim 15 (depends on 14) The combination of claim 14 wherein said distortion relief means is substantially a groove and wherein said body formed on the exterior of said core substantially fills said groove. ### Claim 16 A core of generally annular shape having in one end a recessed socket for engaging another article, said core intended to support a body formed on its exterior from molten metal, said core having a passage through it from one end to the other and including distortion relief means for minimizing shape distortion of said socket resulting from contact with said molten metal. ### Claim 17 (depends on 16) A core according to claim 16 in which said passage terminates in said socket. ### Claim 18 (depends on 17) A core according to claim 17 in which said socket has a non-round shape transverse to said passage. ### Claim 19 (depends on 17) A core according to claim 17 including means operable through said passage for affixing said core to said other article. ### Claim 20 A generally tube-shaped unitary dental core on which to form an artificial tooth including a metallic substrate formed in place from the molten state on an exterior surface thereof, said core being of generally annular shape having in one end a recessed socket for engaging an implant, and including means for minimizing shape distortion of said socket due to contact with said metal in said molten state. ### Claim 21 (depends on 20) A core according to claim 20 in which the mass of said core is reduced near said one end to minimize said distortion. ### Claim 22 (depends on 20) A core according to claim 20 in which said distortion minimizing means comprises a groove in said core near said one end. ### Claim 23 (depends on 22) A core according to claim 22 in which said groove is a substantially continuous annular groove. ### Claim 24 A generally tube-shaped unitary dental core on which to form an artificial tooth including a metallic substrate formed in place from the molten state on an exterior surface thereof, said core having a passage through it from one end to the other and being of generally annular shape having in one end a recessed socket for engaging another article, and including means for minimizing shape distortion of said socket due to contact with said metal in said molten state. ### Claim 25 (depends on 24) A core according to claim 24 in which said one end is widened to a larger diameter than said other end and provides a substantially annular shelf extending radially outward relative to said socket. ### Claim 26 (depends on 25) A core according to claim 25 in which said distortion minimizing means comprises a groove opening through said shelf. ### Claim 27 (depends on 25) A core according to claim 25 and said substrate formed on it in contact with said core and said shelf. ### Claim 28 (depends on 27) A core according to claim 27 in which said distortion minimizing means comprises a groove through said shelf and said substrate substantially fills said groove. ### Claim 29 (depends on 25) A core according to claim 25 in which said larger diameter is not less than about 4 mm. ### Claim 30 (depends on 29) A core according to claim 29 in which said larger diameter is at least about 6 mm. ### Claim 31 (depends on 24) A core according to claim 24 in which said passage terminates in said socket. ### Claim 32 (depends on 31) A core according to claim 31 in which said socket has a non-round shape transverse to said passage. ### Claim 33 (depends on 31) A core according to claim 31 including means operable through said passage for affixing said core to said other article. ### Claim 34 (depends on 31) In combination, a core according to claim 31 and a dental implant having coupling means for cooperating with said socket, and means to affix said core to said implant. ### Claim 35 (depends on 34) A combination according to claim 34 in which said second part of said core and said implant have substantially round meeting surfaces which have substantially the same diameter not smaller than about 4 mm. ### Claim 36 (depends on 35) A combination according to claim 35 in which said diameter is at least about 6 mm. ### Claim 37 (depends on 36) A combination according to claim 36 in which the largest transverse dimension of said socket is about 45% of said diameter. ### Claim 38 In combination, a generally tube-shaped unitary dental core on which to form an artificial tooth including a metallic substrate formed in place from the molten state on an exterior surface thereof, said core being of generally annular shape having in one end a recessed socket for engaging another article, and including means for minimizing shape distortion of said socket due to contact with said metal in said molten state, an artificial tooth on said core, a dental implant, and means to affix said core to said implant. ### Claim 39 (depends on 38) A combination according to claim 38 in which said implant has a diameter not smaller than about 4 mm. ### Claim 40 (depends on 39) A combination according to claim 39 in which said diameter is at least 5 mm.