Patent US4912433A successfully refreshed from Google Patents.
Patent US4129946A successfully refreshed from Google Patents.
US4129946A
Expired / Lapsed
US
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Dental crown form
Assignee: 3M Co
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Filing: 1977-02-17
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Granted: 1978-12-19
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Expires: 1997-02-17
Abstract
Abstract A dental crown form or strip crown for holding and shaping a body of composite resin material being applied to an anterior tooth requiring restoration. The crown form is a thin hollow body with an interior surface conforming to the shape of a natural tooth. A tab is integrally formed at the base or gingival end of the crown form, and the tab extends away from the base to provide a gripping handle for the crown and a surface for displaying a designation of the tooth of intended use. A flange is integrally formed around the base to strengthen and rigidify the crown form which is preferably made of co-polyester plastic.
Inventors
- 👤 Brian G. Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:58
CPC Classifications
A; A61; A61C; A61C5/00; A61C5/70; A61C5/77
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
129 words
In a dental crown form for holding and shaping a restoration material being applied to a prepared damaged tooth, the crown form being a hollow body with an incisal end, an open gingival end, and interior labial, lingual, and interproximal surfaces forming a continuous sidewall conforming in shape to a desired final restored state of the damaged tooth, the improvement comprising a tab secured to the crown form adjacent the gingival end of the body to provide a handle by which the crown form can be held during insertion of the restoration material and when the crown form is installed on the damaged tooth, the tab being integrally formed with the hollow body of the crown form, and extending substantially perpendicularly to an occluso-apical axis of the crown form.
Claim 2
Dependent Claim
129 words
In a dental crown form for holding and shaping a restoration material being applied to a prepared damaged tooth, the crown form being a hollow body with an incisal end, an open gingival end, and interior labial, lingual, and interproximal surfaces forming a continuous sidewall conforming in shape to a desired final restored state of the damaged tooth, the improvement comprising a tab secured to the crown form adjacent the gingival end of the body to provide a handle by which the crown form can be held during insertion of the restoration material and when the crown form is installed on the damaged tooth, the tab being integrally formed with the hollow body of the crown form, and extending substantially perpendicularly to an occluso-apical axis of the crown form.
Claim 3
Dependent Claim
22 words
The improvement defined in claim 1 wherein the hollow body and tab are an integrally molded body of substantially transparent co-polyester plastic.
Claim 4
Dependent Claim
25 words
The improvement defined in claim 2 wherein the tab includes marking means designating a specific tooth on which the crown form is to be used.
Claim 5
Dependent Claim
31 words
The improvement defined in claim 1 wherein an outwardly extending flange is integrally formed around the periphery of the open gingival end of the crown form to strengthen the open end.
Claim 6
Dependent Claim
50 words
The improvement defined in claim 4 wherein the crown form, tab and flange are an integrally molded body of substantially transparent co-polyester plastic, the tab and flange being substantially coplanar, and wherein the tab includes marking means designating a specific tooth on which the crown form is to be used.
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) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |