US4217264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microporous glassy fillers for dental resin composites
Assignee: American Dental Association
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Filing: 1978-09-11
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Granted: 1980-08-12
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Expires: 1998-09-11
Abstract
Abstract A microporous filler for dental composite resin restorations has been developed which gives greatly improved finishability, system non-toxicity and x-ray opacification. These fillers are prepared from frits obtained by the low temperature calcination of gelled inorganic "polymers" followed by a pulsed high-heat treatment.
Inventors
- 👤 Curtis P. Mabie
- 👤 Daniel L. Menis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:04
CPC Classifications
A; A61; A61K; A61K6/00; A61K6/80; A61K6/884; A61K6/887; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2935; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
101 words
In a dental resin composite comprising a resin and a filler material the improvement which comprises the replacement of at least a portion, if not all, of said filler material with a non-toxic, substantially uniform internally microporous glassy filler having a median refractive index between about 1.51 and about 1.64 and a density between about 2.37 and about 3.15 grams per cubic centimeter, said microporous glassy filler comprising a gelled, calcined sol comprised of refractory inorganic oxides including silica and alumina, and at least one non-toxic x-ray opacifying oxide selected from the group consisting of zirconium, hafnium, tantalum and tin oxides.
Claim 2
Dependent Claim
101 words
In a dental resin composite comprising a resin and a filler material the improvement which comprises the replacement of at least a portion, if not all, of said filler material with a non-toxic, substantially uniform internally microporous glassy filler having a median refractive index between about 1.51 and about 1.64 and a density between about 2.37 and about 3.15 grams per cubic centimeter, said microporous glassy filler comprising a gelled, calcined sol comprised of refractory inorganic oxides including silica and alumina, and at least one non-toxic x-ray opacifying oxide selected from the group consisting of zirconium, hafnium, tantalum and tin oxides.
Claim 3
Dependent Claim
22 words
A composite as claimed in claim 1 wherein said microporous glassy filler comprises about 27 to 57 percent by weight silicon dioxide.
Claim 4
Dependent Claim
23 words
A composite as claimed in claim 1 wherein said microporous glassy filler comprises about 13 to about 60 percent by weight aluminum oxide.
Claim 5
Dependent Claim
30 words
A composite as claimed in claim 1 wherein said x-ray opacifying oxide is zirconium oxide comprising from about 18 to about 36 percent by weight of said microporous glassy filler.
Claim 6
Dependent Claim
27 words
A composite as claimed in claim 1 wherein said microporous glassy filler further comprises a fluxing agent in an amount less than about 0.2 percent by weight.
Claim 7
Dependent Claim
27 words
A composite as claimed in claim 6 wherein said fluxing agent is selected from the group consisting of boric anhydride, phosphorous pentoxide, lithium oxide, and sodium oxide.
Claim 8
Dependent Claim
15 words
A composite as claimed in claim 1 wherein said sol further comprises a coloring pigment.
Claim 9
Dependent Claim
14 words
A composite as claimed in claim 8 wherein said coloring pigment comprises carbon black.
Claim 10
Dependent Claim
28 words
A composite as claimed in claim 1 wherein said resin comprises about 50 to about 80 percent 2,3-bis 4-(3-methacryloxy-2-hydroxypropoxy)phenylpropane, and about 50 to about 20 percent triethylene glycoldimethacrylate.
Claim 11
Dependent Claim
24 words
A composite as claimed in claim 1 wherein said resin includes a catalyst selected from the group consisting of benzoyl peroxide or dihydroxy-ethyl p-toluidine.
Claim 12
Dependent Claim
16 words
A composite as claimed in claim 1 wherein said resin includes 2,6-di-t-butyl-p-methyl phenol as a stabilizer.
Claim 13
Dependent Claim
15 words
A composite as claimed in claim 1 wherein said x-ray opacifying oxide is tin oxide.
Claim 14
Dependent Claim
23 words
A composite as claimed in claim 1 wherein said microporous glassy filler has a median refractive index between about 1.55 and about 1.57.
Claim 15
Dependent Claim
52 words
A composite as claimed in claim 1 wherein said internally microporous glassy filler comprises: (a) about 27 to about 57 percent by weight silicon dioxide; (b) about 13 to about 60 percent by weight aluminum oxide; and (c) about 10 to about 36 percent by weight of said non-toxic x-ray opacifying oxide.
Claim 16
Dependent Claim
21 words
A composite as claimed in claim 1 wherein the crystallinity of said filler is less than about 5 percent by volume.
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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) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |