Process for converting a device for the production of acrylic resin dental prostheses to use acetal and similar resins
AssigneePressing Dental S.r.I.
InventorsGiorgio Monticelli, Stefano Monticelli
Life of this patent
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Abstract
A prior art dental prosthesis molding device designed for use with acrylic resin is converted for use with acetal resin by providing a pressing device specially configured to deliver resin injection pressure that substantially exceeds that needed for acrylic, polyvinyl and similar resins. The resin cartridge and cartridge holder of the prior art are replaced with new components fabricated of metal. Substitution of a screw cursor for a pawl retention mechanism strengthens the mold-muffle against expansion and distortion under the elevated pressure of the injected resin.
Claims20
A method for converting a pre-existing device for the production of dental prostheses using a first polymer resin into a converted device, the pre-existing device having a mold-muffle with mating valves that mate to form a generally rectangular enclosure, the preexisting device further having a hollow, cylindrical, non-metal rod disposed radially between the mating valves, one end of the cylindrical rod being connected to the mold-muffle and an opposite end of the rod being disposed for contact with a non-metal resin applicator so that the first polymer resin is injectable through the cylindrical rod and into the mold-muffle, the converted device being configured for production of dental prostheses using a second polymer resin that requires substantially higher injection pressure than does the first polymer resin, said method comprising the steps of:
- replacing the non-metal cylindrical rod with a cylindrical rod made of metal;
- replacing the non-metal resin applicator with a resin applicator made of metal;
- and
- providing an increased-pressure pressing device configured for injecting, with said substantially higher injection pressure, the second resin from the metal resin applicator through the metal cylindrical rod and into the mold-muffle to thereby shape a dental prosthesis within the mold-muffle.
Apparatus for forming a dental prosthesis, said apparatus comprising:
- a hollow, cylindrical resin applicator;
- an increased-pressure pressing device configured for insertion into the resin applicator;
- a mold-muffle having mating valves and a hollow, metal cylindrical rod disposed radially between the valves, one end of the metal cylindrical rod being connected to the mold-muffle and another end of the rod being disposed for operative injection, by the increased-pressure pressing device inserted into the resin applicator, of heated resin from the resin applicator into the mold-muffle through the cylindrical rod;
- a container surrounding the mold-muffle;
- and
- a counter-pressure device that contacts sufficient surface areas of the mold-muffle and the container so that, in pressing between the mold-muffle and the container, the counter-pressure device effectively opposes expansion of the mold-muffle under pressure exerted by the resin injected by the increased-pressure pressing device.
Dependencies are inferred from the claim text.