US3601895A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a dental crown with gold apron
Assignee: Individual
•
Filing: 1970-01-27
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Granted: 1971-08-31
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Expires: 1990-01-27
Abstract
Abstract In a method of making a dental crown, a die is made from an impression of a tooth. A ringlike apron which is preformed is swaged on the die. Alternatively, the apron is formed as a casting made from an impression of the die. A porcelain jacket is then formed on the apron and die. The jacket is then bonded to the apron. The assembly of apron and jacket are then installed on the tooth by cementing both the jacket and apron to the tooth.
Inventors
- 👤 Frank L Zollner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:21
CPC Classifications
A; A61; A61C; A61C13/00; A61C13/0003; A61C5/00; A61C5/70; A61C5/77
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
A method of making a dental crown for a tooth, comprising the steps of making a die from an impression of the tooth, said die having a smaller upper portion and larger lower portion with an annular shoulder between the upper and lower portions; applying a ringlike apron to the shoulder of the die, said upper portion of the die extending through the apron; forming a porcelain jacket on the apron and upper portion of the die; bonding the jacket to the apron; removing the bonded assembly of jacket and apron from the die; and polishing the assembly.
Claim 2
Independent Claim
98 words
A method of making a dental crown for a tooth, comprising the steps of making a die from an impression of the tooth, said die having a smaller upper portion and larger lower portion with an annular shoulder between the upper and lower portions; applying a ringlike apron to the shoulder of the die, said upper portion of the die extending through the apron; forming a porcelain jacket on the apron and upper portion of the die; bonding the jacket to the apron; removing the bonded assembly of jacket and apron from the die; and polishing the assembly.
Claim 3
Dependent Claim
30 words
A method as defined in claim 1, comprising the further step of mounting said assembly on said tooth, and cementing both said jacket and said apron to the tooth simultaneously.
Claim 4
Dependent Claim
34 words
A method as defined in claim 1, comprising the further steps of forming dovetailed grooves in the apron and applying a settable cement to the apron prior to bonding the jacket to the apron.
Claim 5
Dependent Claim
27 words
A method as defined in claim 1, comprising the further step of swaging the apron on the die prior to forming the porcelain jacket on the apron.
Claim 6
Dependent Claim
33 words
A method as defined in claim 4 comprising the further steps of forming dovetailed grooves in the apron and applying settable cement to the apron prior to bonding the jacket to the apron.
Claim 7
Dependent Claim
30 words
A method as defined in claim 4, comprising the further step of mounting said assembly on said tooth, and cementing both said jacket and said apron to the tooth simultaneously.
Claim 8
Dependent Claim
45 words
A method as defined in claim 1, comprising the further steps of taking a plastic impression of the shoulder and adjacent parts of the die, and casting said ringlike apron from said plastic impression of the die prior to applying the apron to the die.
Claim 9
Dependent Claim
33 words
A method as defined in claim 7 comprising the further steps of forming dovetailed grooves in the apron and applying settable cement to the apron prior to bonding the jacket to the apron.
Claim 10
Dependent Claim
29 words
A method as defined in claim 8, comprising the further step of mounting said assembly on said tooth, and cementing both said jacket and said apron to the tooth.
References Cited (Backward Citations)
US2770040A
Cited
US2930125A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |