Classifications

• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/20—Methods or devices for soldering, casting, moulding or melting
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/12—Tools for fastening artificial teeth; Holders, clamps, or stands for artificial teeth
  • A61C13/16—Curing flasks; Holders therefor
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/08—Artificial teeth; Making same
  • A61C13/081—Making teeth by casting or moulding
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/08—Artificial teeth; Making same
  • A61C13/087—Artificial resin teeth
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/12—Tools for fastening artificial teeth; Holders, clamps, or stands for artificial teeth
  • A61C13/18—Presses for flasks
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
  • A61C13/00—Dental prostheses; Making same
  • A61C13/20—Methods or devices for soldering, casting, moulding or melting
  • A61C13/206—Injection moulding

Definitions

• the present invention relates to a flask for molding dentures, and more particularly, to a flask for molding dentures having a simple structure not requiring pneumatic or hydraulic pressure and preventing bad molding of dentures.
• dentures are manufactured in such a way that a model of a person's mouth is made and artificial teeth are planted into the model to form a plaster mold, and the hollow plaster mold is inserted into a flask and the dentures are made of dental plate according to a pressure molding technique or an injection molding technique.
• FIG. 1 is an elevation sectional view illustrating a conventional denture molding apparatus.
• the conventional denture molding apparatus includes a two- plated mold 110 having a sprue 111 and a pneumatic cylinder 140 connected to the upper end of the mold 110 by means of a connector 145.
• the mold 110 has an injection part 120 filled with resin and formed at the upper side of the sprue 111.
• the lower end of a piston 130 driven by the pneumatic cylinder 140 is accommodated and the piston 130 applies pressure to the sprue 111.
• Hot molten thermoplastic resin is injected into the mold 110 under a high pressure and the mold 110 is separated after cooling, completing the denture manufacturing process.
• the present invention has been made in view of the above problems, and it is an object of the present invention to provide a denture molding flask having a simple structure without a pneumatic cylinder or a hydraulic cylinder and preventing insufficient injected dental plate during the molding of the dentures due to bubbles, drop of stiffness of dentures, and inferiority of the dentures due to breakage when separating a mold.
• a flask for molding dentures into which molten material is injected into cavities formed by the bolt coupling through sprues
• the flask including an upper plate including an injection pipe, an ejector, an air hole, guide pins , and nuts fastened with bolts, a lower plate including an injection pipe, an ejector, an air hole, guide holes, and bushings through which the bolts penetrate, a connection pipe connected to the injection pipes when the upper plate and the lower plate are coupled with each other, a pressing part including pressing pieces coupled to sides of a spring and a cap nut and compressed to be accommodated in the connection pipe , and a conduit part including a first inner member installed in the sprues, a second inner member installed in the connection pipe, a third inner member installed to the pressing part, and fourth inner members installed to the upper sides of the cavities of the upper plate and the lower plate.
• th e inner members of the conduit part are made of fluorine resin having excellent non-adhesiveness and excellent heat resistance and low heat conductivity or other material having properties equal or superior to the properties of the fluorine resin.
• the first inner member and the fourth inner member have two pieces separated along a vertical line, respectively.
• the denture molding flask has a simple structure without use of a pneumatic cylinder or a hydraulic cylinder and prevents insufficient injection of dental plate, reduced denture stiffness due to bubbles, and inferiority of the dentures due to breakage when separating a mold.
• FIG. 1 is an elevation sectional view illustrating a conventional denture molding apparatus
• FIG. 2 is a n exploded perspective view illustrating a denture molding flask according to a preferred embodiment of the present invention
• Fig. 3 is a sectional view illustrating an assembly of the denture molding flask according to the preferred embodiment of the present invention.
• FIG. 4 is a view illustrating the separation of a mold from the denture molding flask according to the preferred embodiment of the present invention.
• Fig. 2 is a n exploded perspective view illustrating a denture molding flask according to a preferred embodiment of the present invention
• Fig. 3 is a sectional view illustrating an assembly of the denture molding flask according to the preferred embodiment of the present invention.
• the present invention relates to an apparatus for molding dentures by injecting molten material into cavities, formed when being assembled by bolts, through sprues 11 and 21.
• the dentures are basically made of polymer such as resin.
• the present invention employs a flask structure divided into two plates; an upper plate 10 and a lower plate 20. Note that the division into the upper and lower plates is defined for illustrative purposes only.
• the upper plate 10 and the lower plate 20 are coupled with and separated from each other by bolts (not shown) and have coupling holes into which nuts 15 and bushings 25 are tightly fitted.
• the tight fitting of the nuts 15 and the bushings 25 enables rapid and convenient coupling of the upper plate 10 and the lower plate 20 simply by inserting the bolts into the bushings 25 and fastening the bolts even when the nuts 15 and washers 25 are not prepared.
• the upper plate 10 includes an injection pipe 12, an ejector
• the lower plate includes an injection pipe 22, an ejector 28, an air hole, and guide holes 24.
• the injection pipe 22 is extended from the circumference of the semi-circular sprue 21 to have a semicircular shape
• the ejector 28 is installed to contact a plaster mold
• the air hole is communicated with the cavity
• the guide holes 24 are symmetrically formed at two side places of the lower plate 20.
• the lower plate 20 further includes grooves 26 for conveniently separating the lower plate 20 from the upper plate 10 after molding and a guide hole 27 for fixing the location of the lower plate 20 when a press presses the lower plate 20.
• the injection pipe 12, the ejector 18, and the air hole of the upper plate 10 are formed at the positions corresponding to the positions of the injection pipe 22, the ejector 28, and the air hole of the lower plate 20.
• the upper plate 10 includes the guide pins 14 inserted into the guide holes 24 of the lower plate 20, but elements corresponding to the grooves 26 of the lower plate 20 are not formed in the upper plate 10.
• the ejectors 18 and 28 have a slope to prevent the ejectors 18 and 28 from being separated from the upper plate 10 and the lower plate 20 and to move to the cavities.
• connection pipe 45 is connected to the injection pipes 12 and 22 when the upper plate 10 and the lower plate 20 are coupled.
• the connection pipe 45 has knurls and planes formed at the intermediate portion of the outer circumference of the connection pipe 45 and enabling a user to rotate the connection pipe 45 with tools or by hand, and threads formed in the upper and lower sides of the connection pipe 45.
• the lower side of the connection pipe 45 is connected to the injection pipes 12 and 22 and the upper side of the connection pipe 45 is coupled with a cap nut 35 described later.
• the flask according to the preferred embodiment of the present invention further includes a pressing part 30 having pressing pieces 31 and 32 coupled to the sides of a spring 33 and compressed to be accommodated in the connection pipe 45 by the cap nut 35.
• the elastic structure wherein the pressing pieces 31 and 32 are coupled with the sides of the spring 33, performs the same function as the conventional piston in Fig 1.
• the upper pressing piece 31 has a step and protrudes over the cap nut 35 by a predetermined height, and the lower pressing piece 32 seals the connection pipe 45 and slides along the connection pipe 45.
• the cap nut 35 is coupled with the upper side of the connection pipe 45 to store elastic energy of the spring 33 when the distance between the pressing pieces 31 and 32 becomes short.
• a knurl is formed in the outer circumference of the cap nut 35, enabling a user to easily rotate the cap nut by hand.
• the flask according to the preferred embodiment of the present invention further includes a conduit part 40 having a first inner member 41 installed in the injection pipes 11 and 22, a second inner member 42 installed in the connection pipe 45, a third inner member 43 installed in the pressing part 30, and fourth inner members 44 respectively installed in the upper portions of the cavities of the upper plate 10 and the lower plate 20.
• the first inner member 41 has a T-shaped cross-section having an upper side with the same diameter as that the inner diameters of the injection pipes 12 and 22 and a lower side with the same diameter as the inner diameters of the sprues 11 and 21.
• the second inner member 42 closely contacts the inner circumference of the connection pipe 45 and has an expanded lower side having the same diameter as the diameter of the injection pipes 12 and 22.
• the third inner member 43 has the same diameter as the inner diameter of the second inner member 42 and is attached to the lower pressing piece 32.
• the lower pressing piece 32 preferably has a diameter slightly less than the diameter of the third inner member 43.
• the fourth inner members approximately cover upper halves of the cavities of the upper and lower plates 10 and 20.
• the inner members 41, 42, 43, and 44 of the conduit part 40 are made of fluorine resin having excellent non- adhesiveness and excellent heat resistance and low heat conductivity or other material having properties equal or superior to the properties of the fluorine resin.
• fluorine resin having excellent non- adhesiveness and excellent heat resistance and low heat conductivity or other material having properties equal or superior to the properties of the fluorine resin.
• Teflon resin manufactured by DuPont Corporation endures a high temperature of 240 degrees centigrade to 250 degrees centigrade during the molding and properly prevents heat transfer from to exterior.
• Teflon since an engineering plastic has an excellent heat resistance and mechanical strength, engineering plastic may be used as a base material and the inner surface of the engineering plastic is coated with a material having excellent lubricity.
• a lubricant resin manufactured by mixing polyolefin resin with dimethyl silicon oil without functional group.
• connection pipe 45 accommodating the first inner member 41 and the second inner member 42, is coupled with the pressing piece 31 accommodating the third inner member 43, a space, filled with the dental plate resin, is surrounded by the inner members 41, 42, and 43, and flows to the cavity due to force of a press transmitted through the pressing piece 31 and the elastic force of the spring 33.
• the lower side of the first inner member 41 has a length sufficient to pass through the sprues 11 and 21, to penetrate the fourth inner members 44, and to slightly extend into the cavity.
• Fig. 4 is a view illustrating the separation of a mold from the denture molding flask according to the preferred embodiment of the present invention .
• the upper and lower plates 10 and 20 are separated and the ejectors 18 and 28 are struck to separate plaster mold therefrom.
• Not- solidified resin R in the inner members 41, 42, 43, and 44 is easily separated from solidified resin R' in the cavities and is not damaged. After this, although the resin R remaining in the inner members 41, 42, 43, and 44 is solidified, the resin R is easily separated from the inner members 41, 42, 43, and 44 due to the excellent lubricant properties.
• first inner member 41 and the fourth inner member 44 respectively have two pieces separated about a vertical line, it is convenient to work the molding. If lengths of the first inner member 41 and the fourth inner member 44 are short, the solidification progresses to a portion of resin corresponding to the shortened length so that the dentures are damaged during the separation.

Landscapes

• Health & Medical Sciences (AREA)
• Oral & Maxillofacial Surgery (AREA)
• Dentistry (AREA)
• Epidemiology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Dental Prosthetics (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

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Cited By (1)

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Citations (2)

• 2005
  • 2005-02-28 KR KR20050016590A patent/KR100548957B1/ko active IP Right Grant
  • 2005-06-10 WO PCT/KR2005/001762 patent/WO2006090952A1/en active Application Filing

Patent Citations (2)

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