Abstract A method and apparatus for making a molded prosthesis such as a denture, a partial, an orthondic appliance, or the like by way of a mold flask permitting the prosthesis to be obtained by means of injection molding. A first half mold is made of a cast of the buccal tissue portion bearing the prosthesis, a wax pattern of the prosthesis is disposed in adhesion to the appropriate portion of the cast and the cast is placed in a flask where it is held in position by appropriate holding means. Investment material is poured between the tissue cast and the side of the flask, and once set forms the second half of the mold. The two halves of the mold are removed from the flask and the wax pattern is removed. The two halves of the mold are returned to the flask and held in appropriate registration, and an appropriate hardenable fluid material is injected into a gate into the cavity resulting from the removal of the prosthesis pattern and the material allowed to set to a solid form, thus providing the molded prosthesis. The molded prosthesis requires very little, if any, finishing work for providing an accurately fitted denture, partial, orthondic appliance, or other prosthetic part.
Inventors
👤 Alain Clenet
👤 Rudiger Piatkowski
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-02 04:41
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
An apparatus for making a molded article comprising a flask having a bottom, two sidewalls, an end wall and an open top, means in said flask for holding a first half mold with a wax pattern of the article on a surface thereof and for forming a dam for investment material poured between said first half mold and said end wall for forming a second half mold, said means for holding said first half mold comprising a block of resilient material substantially U-shaped and removably disposed in said flask proximate said end wall for compressably holding said first half mold by engaging at least two opposite sides thereof, registration means dependent from said end wall for providing registration of said investment material forming said second half mold when set with said end wall and a gate forming plug extending to the exterior of said flask with an end of said plug engaged with the wax pattern.
Claim 2
Independent Claim
156 words
An apparatus for making a molded article comprising a flask having a bottom, two sidewalls, an end wall and an open top, means in said flask for holding a first half mold with a wax pattern of the article on a surface thereof and for forming a dam for investment material poured between said first half mold and said end wall for forming a second half mold, said means for holding said first half mold comprising a block of resilient material substantially U-shaped and removably disposed in said flask proximate said end wall for compressably holding said first half mold by engaging at least two opposite sides thereof, registration means dependent from said end wall for providing registration of said investment material forming said second half mold when set with said end wall and a gate forming plug extending to the exterior of said flask with an end of said plug engaged with the wax pattern.
Claim 3
Dependent Claim
46 words
The apparatus of claim 1 wherein said registration means comprises threaded apertures through said end wall and a plurality of slugs each threadably engaged in one of said threaded apertures in said end wall and having a portion projecting from said end wall into said flask.
Claim 4
Dependent Claim
48 words
The apparatus of claim 2 wherein said gate forming plug comprises a support member threadably engageable in one of said threaded apertures and having a longitudinally disposed bore, and a rod slidably disposed through said bore and adjustable for engagement of an end thereof with said wax pattern.
Claim 5
Dependent Claim
27 words
The apparatus of claim 3 further comprising adjustable clamping means engageable with said first half mold for clamping said first half mold with said second half mold.
Claim 6
Dependent Claim
28 words
The apparatus of claim 3 further comprising injection molding apparatus having a nozzle threadable in said aperture in the end wall after removal of said gate forming plug.