# US 11,998,409 B2 · Dental composite blank and method for manufacturing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,409 B2 - Document ID: US11998409B2 - Status: Granted - Kind: B2 - Application number: 16/957,211 - Filed: 2018-12-28 - Published: 2020-12-31 - Granted: 2024-06-04 - Earliest claimed: 2017-12-28 - Assignees: Vericom Co., Ltd. - Applicants: Vericom Co., Ltd. - Inventors: Myung-Hwan Oh; Jong-Ho Kang; Hyun-Chul Yoo; Joung-Lim Hoo; Yun-Ki Kim - Web page: https://patentgrep.com/patent/US11998409B2 ## CPC - A61C 13/081: {Making teeth by casting or moulding} - A61C 13/0022: {Blanks or green, unfinished dental restoration parts} - A61C 13/087: Artificial resin teeth {(A61C13/081 takes precedence; preparations A61K6/80)} - A61K 6/887: Compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds - 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) - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) ## Abstract The present invention relates to a method of manufacturing a dental composite blank, including (a) placing a composite paste in a mold, (b) pressurizing the composite paste placed in the mold at a first pressure (P1), (c) pressurizing the composite paste placed in the mold at a second pressure (P2), and (d) curing the pressurized composite paste, in which each of steps (b) and (c) is performed once or multiple times, and the first pressure (P1) is less than or greater than the second pressure (P2). The dental composite blank and the method of manufacturing the same are effective at dispersing a non-dispersed filler and removing bubbles, thus improving mechanical properties, through repeated pressurization at different pressures before curing the composite paste. ## Claims ### Claim 1 A method of manufacturing a dental composite blank, comprising: (a) placing a composite paste in a mold; (b) pressurizing the composite paste placed in the mold at a first pressure (P1); (c) pressurizing the composite paste placed in the mold at a second pressure (P2); and (d) curing the pressurized composite paste, wherein, each of steps (b) and (c) is performed once or multiple times, the first pressure (P1) is less than or greater than the second pressure (P2), and any one of the first pressure (P1) and the second pressure (P2) is 5 to 300 MPa and a remaining one thereof is 1 to 10 MPa. ### Claim 2 (depends on 1) The method of claim 1, wherein steps (b) and (c) are repeatedly performed. ### Claim 3 (depends on 1) The method of claim 1, wherein each of steps (b) and (c) is performed 1 to 20 times, and steps (b) and (c) are alternately performed. ### Claim 4 (depends on 1) The method of claim 1, wherein a difference between the first pressure (P1) and the second pressure (P2) is 5 to 299 MPa. ### Claim 5 (depends on 1) The method of claim 1, wherein steps (b) and (c) are each independently performed at 10 to 59° C. ### Claim 6 (depends on 1) The method of claim 1, wherein curing is not performed in each of steps (b) and (c). ### Claim 7 (depends on 1) The method of claim 1, wherein steps (b) and (c) are performed in an inert gas atmosphere. ### Claim 8 (depends on 1) The method of claim 1, wherein step (d) is performed at a pressure of 5 to 300 MPa. ### Claim 9 (depends on 8) The method of claim 8, wherein step (d) is performed at a temperature of 80 to 200° C. ### Claim 10 (depends on 1) The method of claim 1, wherein step (b) is performed multiple times, and during step (b) performed multiple times, a pressure (P1(1)) in step (b) performed for a first time is same as or different from a pressure (P1(2)) in step (b) performed later. ### Claim 11 (depends on 1) The method of claim 1, wherein step (c) is performed multiple times, and during step (c) performed multiple times, a pressure (P2(1)) in step (c) performed for a first time is same as or different from a pressure (P2(2)) in step (c) performed later. ### Claim 12 (depends on 1) The method of claim 1, wherein the composite paste comprises at least one unsaturated-double-bond compound selected from among a monomer containing an unsaturated double bond and an oligomer of a monomer containing an unsaturated double bond; a filler; and a polymerization initiator. ### Claim 13 (depends on 12) The method of claim 12, wherein the monomer comprises at least one selected from the group consisting of 2,2-bis[4-(2-hydroxy-3-methacryloxypropoxy) phenyl]propane (Bis-GMA), ethylene glycol dimethacrylate (EGDMA), ethylene glycol diacrylate (EDGA), triethylene glycol dimethacrylate (TEGDMA), triethylene glycol diacrylate (TEGDA), ethoxylated bisphenol A dimethacrylate (Bis-EMA), urethane dimethacrylate (UDMA), polyurethane diacrylate (PUDA), dipentaerythritol pentaacrylate monophosphate (PENTA), 2-hydroxyethyl methacrylate (HEMA), polyalkenoic acid, biphenyl dimethacrylate (BPDM), biphenyl diacrylate (BPDA) and glycerol phosphate dimethacrylate (GPDM). ### Claim 14 (depends on 12) The method of claim 12, wherein the filler comprises at least one selected from among an inorganic filler and an organic filler, and the inorganic filler comprises at least one selected from the group consisting of synthetic amorphous silica, crystalline silica, barium silicate, barium borosilicate, barium fluoroaluminoborosilicate, barium aluminoborosilicate, strontium silicate, strontium borosilicate, strontium aluminoborosilicate, calcium silicate, aluminosilicate, silicon nitride, titanium dioxide, calcium hydroxyapatite, zirconia and bioactive glass. ### Claim 15 (depends on 12) The method of claim 12, wherein the polymerization initiator comprises a thermal polymerization initiator. ### Claim 16 (depends on 12) The method of claim 12, wherein the composite paste comprises 100 parts by weight of the unsaturated-double-bond compound; 50 to 1,000 parts by weight of the filler; and 0.01 to 5 parts by weight of the polymerization initiator. ### Claim 17 (depends on 1) The method of claim 1, wherein, each of steps (b) and (c) is performed 1 to 20 times, and steps (b) and (c) are performed alternately, two consecutive first pressures are different, two consecutive second pressures are different, and the curing is performed at a pressure higher than the first pressure and the second pressure of the last repeat step.