US3695333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating dental crowns and bridges from gold
Assignee: POLICLINICA DE STOMATOLOGIE
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Filing: 1970-09-23
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Granted: 1972-10-03
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Expires: 1990-09-23
Abstract
Abstract The invention refers to a fabricating method for one-piece cast dental crowns, with controlled thickness, as well as for dental bridges consisting of crowns and the bridge body. To this end a calibrated wax cylinder is placed on the tooth stump, this cylinder being flared in order to form proximal contact points with the adjoining teeth, thus realizing practically also the control of thickness; over the wax cylinder a lid is applied at the level of the occusal surface and in which the occlusal relief is fashioned in relation to the contact points of the antagonistic teeth. In the case of dental bridges, the patterns of the respective crowns are fashioned first, as above, then the pattern of the bridge body which is united with the pattern of the crowns, after which follows the casting of the entire assembly from a gold alloy.
Inventors
- 👤 Eugene Costa
- 👤 Lucian Ene
- 👤 Stelica Dumitrescu
- 👤 Ioan Covaci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:20
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; Y; Y10; Y10S; Y10S164/00; Y10S164/04; Y10T; Y10T29/00; Y10T29/49; Y10T29/49567
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
A method making a dental prosthesis, such as a dental bridge or crown, comprising the steps of: forming a positive model of a tooth stump; applying over said model a substantially cylindrical and hollow body of wax of substantially uniform wall thickness; applying to one end of said body and over the occlusal surface of said model a wax disk having substantially the same thickness as said body, thereby forming a wax cup of substantially uniform wall thickness partially receiving said model; contouring the exterior of said cup by addition of additional wax to impart the desired tooth shape to said cup; and investment casting a dental crown from the contoured cup.
Claim 2
Independent Claim
112 words
A method making a dental prosthesis, such as a dental bridge or crown, comprising the steps of: forming a positive model of a tooth stump; applying over said model a substantially cylindrical and hollow body of wax of substantially uniform wall thickness; applying to one end of said body and over the occlusal surface of said model a wax disk having substantially the same thickness as said body, thereby forming a wax cup of substantially uniform wall thickness partially receiving said model; contouring the exterior of said cup by addition of additional wax to impart the desired tooth shape to said cup; and investment casting a dental crown from the contoured cup.
Claim 3
Dependent Claim
25 words
The method defined in claim 1, further comprising the step of flaring said cylindrical body to form an empty space between it and said model.
Claim 4
Dependent Claim
23 words
The method defined in claim 2 wherein the flaring step is carried out prior to the application of said disk to said cylinder.
Claim 5
Dependent Claim
14 words
The method defined in claim 3 wherein said positive model is formed of plaster.
Claim 6
Dependent Claim
18 words
The method defined in claim 3 wherein said cylindrical body is made of a calibrated band of wax.
Claim 7
Dependent Claim
21 words
The method defined in claim 3 wherein said cylindrical body and said disk have a thickness between 0.3 and 0.4 millimeters.
Claim 8
Dependent Claim
76 words
The method defined in claim 3 wherein said positive model is formed of a mouth region having a pair of tooth stumps to be interconnected by a dental bridge, a contoured cup being fashioned for each of said stumps, said method further comprising the step of forming between said cups a wax bridge having a shape corresponding to the desired brIdge shape, both of said cups and said wax bridge being simultaneously investment cast in metal.
Claim 9
Dependent Claim
18 words
The method defined in claim 7 wherein said cups and bridge are cast of an alloy containing gold.
Claim 10
Dependent Claim
34 words
The method defined in claim 7 wherein both of said cups are formed the respective tooth-stump models and said bridge is formed between said cups while they are mounted on their respective tooth-stump models.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |