US4649165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental filling material comprising polymerizable (meth)acrylic compound, X-ray opaque fillers and microfiller
Assignee: Blendax GmbH
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Filing: 1985-01-26
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Granted: 1987-03-10
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Expires: 2005-01-26
Abstract
Abstract Dental filling material on the basis of polymerizable compounds and an inorganic filler mixture with improved properties, particularly excellent X-ray opacity and polishability, where the filler mixture essentially consists of an X-ray opaque filler with a particle size distribution of between 0,5 and 40 μm, an X-ray opaque filler with a particle size distribution of between 0,2 and 15 μm and a microfiller, particularly colloidal silica, with a particle size distribution of between 5 and 150 nm.
Inventors
- 👤 Werner Kuhlmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:34
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
Dental filling material comprising (i) one or more polymerizable (meth) acrylic compounds, (ii) polymerization accelerators, polymerization initiators or mixtures thereof and about 60 to 90% by weight, based on the total composition, of an inorganic filler mixture of at least two X-ray opaque fillers with different particle size distribution which comprises: (a) about 5 to 20% by weight, based on the total filler mixture, of at least one X-ray opaque filler with a particle size distribution of between 0.5 to 40 micrometers, (b) about 20 to 40% by weight, based on the total filler mixture, of at least one X-ray opaque filler with a particle size distribution of between 0.2 and 15 micrometers, and (c) about 40 to 75% by weight, based on the total filler mixture, of at least one microfiller with a particle size distribution between 5 and 150 nanometers.
Claim 2
Dependent Claim
142 words
Dental filling material comprising (i) one or more polymerizable (meth) acrylic compounds, (ii) polymerization accelerators, polymerization initiators or mixtures thereof and about 60 to 90% by weight, based on the total composition, of an inorganic filler mixture of at least two X-ray opaque fillers with different particle size distribution which comprises: (a) about 5 to 20% by weight, based on the total filler mixture, of at least one X-ray opaque filler with a particle size distribution of between 0.5 to 40 micrometers, (b) about 20 to 40% by weight, based on the total filler mixture, of at least one X-ray opaque filler with a particle size distribution of between 0.2 and 15 micrometers, and (c) about 40 to 75% by weight, based on the total filler mixture, of at least one microfiller with a particle size distribution between 5 and 150 nanometers.
Claim 3
Dependent Claim
23 words
Dental filling material according to claim 1 containing about 10 to 15% by weight, based on the total filler mixture, of filler (a).
Claim 4
Dependent Claim
23 words
Dental filling material according to claim 1 containing about 25 to 35% by weight, based on the total filler mixture, of filler (b).
Claim 5
Dependent Claim
23 words
Dental filling material according to claim 1 containing about 55 to 65% by weight, based on the total filler mixture, of microfiller (c).
Claim 6
Dependent Claim
13 words
Dental filling material according to claim 1 wherein the microfiller is colloidal silica.
Claim 7
Dependent Claim
22 words
Dental filling material according to claim 1 wherein the microfiller (c) has an average particle size of about 30 to 60 nanometers.
Claim 8
Dependent Claim
42 words
Dental filling material according to claim 1 wherein filler (a) has the following particle size distribution: ______________________________________
about 5% 0.5-1 micrometers,
about 10% 1-2 micrometers,
about 20% 2-5 micrometers,
about 20% 5-10 micrometers,
about 30% 10-20 micrometers,
about 15% 20-40 micrometers,
______________________________________
Claim 9
Dependent Claim
42 words
Dental filling material according to claim 1 wherein filler (b) has the following particle size distribution: ______________________________________
about 5% 0.2-0.5 micrometers,
about 10% 0.5-1 micrometers,
about 15% 1-2 micrometers,
about 45% 2-5 micrometers,
about 20% 5-10 micrometers,
about 5% 10-15 micrometers.
______________________________________
Claim 10
Dependent Claim
21 words
Dental filling material according to claim 1 wherein at least one of filler (a), filler (b) and microfiller (c) is silanized.
References Cited (Backward Citations)
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US4389497A
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US4297266A
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US4407984A
Cited
US4427799A
Cited
US4388069A
Cited
US4544359A
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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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |