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US3768164A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of making a dental appliance

Assignee: Great Lakes Orthodontic Laboratories Inc
•
Filing: 1972-10-26
•
Granted: 1973-10-30
•
Expires: 1992-10-26
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Abstract

Abstract A dental model formed from an impression taken from a patient''s mouth is provided with anchoring wires at prescribed locations and then supported in a molding machine. The model is isolated or masked by surrounding it with small pellets of lead or other relatively dense material. An acrylic material in liquid form, a major constituent of which is methyl methacrylate, is applied to a selected portion of each wire, usually within the periphery of the model. Immediately thereafter a preheated sheet of thermoplastic material, a major constituent of which is methyl methacrylate, is applied to the model and shaped to conform thereto in a manner such that the selected portions of the anchoring wires are embedded in the plastic material. Upon cooling the resulting product, known as a retainer, is separated from the model.

Inventors

No inventors recorded.

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 21:31
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/01; A61C13/04

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 47 words
A method according to claim 1, wherein said auxiliary member comprises an anchoring wire which is positioned so that a portion is adjacent the palatal portion of said model and wherein said liquid material is applied to said portion of said wire adjacent said model palatal portion.
Claim 2
Dependent Claim 47 words
A method according to claim 2, wherein a plurality of anchoring wires are positioned on said model, each wire having a portion adjacent the palatal portion of said model, and wherein said liquid material is applied to each of said wire portions adjacent said model palatal portion.
Claim 3
Dependent Claim 33 words
A method according to claim 1, wherein said model is supported by placing a plurality of relatively small pellets of a relatively dense material against surfaces of said model not to receive plastic.
Claim 4
Dependent Claim 12 words
A method according to claim 4, wherein said pellets are of lead.
Claim 5
Dependent Claim 55 words
A method according to claim 4, wherein said model is placed in an open top receptacle with the top edge of the teeth of said model approximately flush with the top of said receptacle and wherein said pellets are placed in said receptacle around said model and below the top edge of the teeth thereof.
Claim 6
Dependent Claim 27 words
A method according to claim 1, wherein said heated plastic material is applied to said model before said liquid material on said auxiliary member begins to cure.
Claim 7
Dependent Claim 18 words
A method according to claim 1, wherein said thermoplastic material has methyl methacrylate as a major constituent thereof.
Claim 8
Dependent Claim 32 words
A method according to claim 1, wherein said thermoplastic material is applied to said model and shaped in a manner embedding said selected portion of said auxiliary member in said plastic material.
Claim 9
Dependent Claim 21 words
A method according to claim 1, further including separating the resulting product from the model and removing any excess plastic therefrom.
Claim 10
Dependent Claim 32 words
A method according to claim 10, further including applying a coating of a resinous liquid to the surface of said product which was in contact with said model to finish said surface.
Claim 11
Dependent Claim 10 words
A dental appliance obtained by the method of claim 1.

References Cited (Backward Citations)

US2616175A Cited
US2645012A Cited
US3259129A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-10-29 1977-04-30 1977-10-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-10-29 1981-04-30 1981-10-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-10-29 1985-04-30 1985-10-30 $7700.00 Window Closed / Lapsed

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