US4234310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous ceramic dental filling insert
Assignee: Individual
•
Filing: 1978-02-14
•
Granted: 1980-11-18
•
Expires: 1998-02-14
Abstract
Abstract The insert is held in place by surrounding plastic filling material and improves resistance to abrasion. Bonding to the filling material is improved by impregnation of the insert with a wetting agent or filling material. The insert may be made by extruding a porcelain paste into the desired crossection segments. Porosity of the fired material is obtained by mixing a volatile binder, such as polyethelene glycol, with the ceramic powder. Acid treatment is also disclosed for providing the desired porosity.
Inventors
- 👤 Paul E. Leuthard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:24
CPC Classifications
A; A61; A61C; A61C5/00; A61K; A61K6/00; A61K6/15; A61K6/17; A61K6/80; A61K6/802; A61C5/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
In a dental filling including a conventional plastic filling material adapted to be located in a cavity drilled in a tooth, the improvement comprising: a preformed, abrasive resistant, porous ceramic insert embedded in the conventional plastic filling material, said insert having an outer shape different from and unrelated to the shape of the cavity, said insert having an exposed surface adapted to be aligned with the surface of the tooth to improve resistance of the dental filling to abrasion, said insert being impregnated with a plastic material which forms a firm bond with the plastic filling material.
Claim 2
Dependent Claim
97 words
In a dental filling including a conventional plastic filling material adapted to be located in a cavity drilled in a tooth, the improvement comprising: a preformed, abrasive resistant, porous ceramic insert embedded in the conventional plastic filling material, said insert having an outer shape different from and unrelated to the shape of the cavity, said insert having an exposed surface adapted to be aligned with the surface of the tooth to improve resistance of the dental filling to abrasion, said insert being impregnated with a plastic material which forms a firm bond with the plastic filling material.
Claim 3
Dependent Claim
42 words
The improvement according to claim 1 wherein said insert has means for increasing the friction between the outer surface thereof and the contacting portions of the conventional plastic filling material to foster retention of said insert relative to said plastic filling material.
Claim 4
Dependent Claim
14 words
The improvement according to claim 1 and wherein said insert has a triangular cross-section.
Claim 5
Dependent Claim
14 words
The improvement according to claim 1 and wherein said insert has a rhombic cross-section.
Claim 6
Dependent Claim
20 words
The improvement according to claim 1 and wherein at least two of the lateral surfaces of said insert are non-planar.
Claim 7
Dependent Claim
22 words
The improvement according to claim 1 and wherein at least one side of the cross-section of said insert is a concave shape.
Claim 8
Dependent Claim
25 words
The improvement according to claim 1 and wherein the surface of said insert is open-pored with pores of between 5 and 50 micro-meters in diameter.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |