US5482732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dental porcelain shading method
Assignee: Dentsply Research and Development Corp
•
Filing: 1994-06-09
•
Granted: 1996-01-09
•
Expires: 2014-06-09
Abstract
Abstract The invention provides a method for the preparation of porcelain dental restorations. First, second and third powders are provided in labeled containers. The first powder has a lightness value (L 1 ) when formed into a least porcelain layer. The second powder has lightness value (L 2 ) when formed into a less opaque ceramic layer. The third powder has a lightness value (L 3 ) when formed into most opaque ceramic layer. The third lightness value is greater than the second lightness value, which is greater than the first lightness value. The lightness value lightness value (L 1 ) are less than 2.5 CIE L*a*b units.
Inventors
- 👤 Carolyn M. Kramer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:11
CPC Classifications
A; A61; A61C; A61C19/00; A61C19/10; A61C13/00; A61C13/08; A61C13/082; A61C13/083; A61K; A61K6/00; A61K6/15; A61K6/16; A61K6/70; A61K6/78; A61K6/80; A61K6/802
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
261 words
A method of making a porcelain dental prosthesis, having a substantially monotonic change in lightness value between layers for a most opaque ceramic layer underlying a less opaque ceramic layer positioned beneath a least opaque porcelain layer, comprising: providing a first powder enclosed by a first labeled container and having a first opacity (O 1 ), and first lightness value (L 1 ) when formed into said least opaque porcelain layer, a second powder enclosed by a second labeled container having a second opacity (O 2 ) and a second lightness value (L 2 ) when formed into said less opaque ceramic layer, and a third powder enclosed by a third labeled container having a third opacity (O 3 ) and a third lightness value (L 3 ) when formed into said most opaque ceramic layer, said least opaque, more opaque and most opaque layers each not being thicker than 0.8 mm, said third opacity (O 3 ) being greater than said second opacity (O 2 ), said second opacity (O 2 ) being greater than said first opacity (O 1 ), said third lightness value (L 3 )being greater than said second lightness value (L 2 ) and said second lightness value (L 2 ) being greater than said first lightness value (L 1 ). forming said third powder into said most opaque ceramic layer on a substrate, forming a second powder into said less opaque ceramic layer on said most opaque ceramic layer, forming said first powder into said least opaque ceramic layer on said less opaque ceramic layer.
Claim 2
Independent Claim
261 words
A method of making a porcelain dental prosthesis, having a substantially monotonic change in lightness value between layers for a most opaque ceramic layer underlying a less opaque ceramic layer positioned beneath a least opaque porcelain layer, comprising: providing a first powder enclosed by a first labeled container and having a first opacity (O 1 ), and first lightness value (L 1 ) when formed into said least opaque porcelain layer, a second powder enclosed by a second labeled container having a second opacity (O 2 ) and a second lightness value (L 2 ) when formed into said less opaque ceramic layer, and a third powder enclosed by a third labeled container having a third opacity (O 3 ) and a third lightness value (L 3 ) when formed into said most opaque ceramic layer, said least opaque, more opaque and most opaque layers each not being thicker than 0.8 mm, said third opacity (O 3 ) being greater than said second opacity (O 2 ), said second opacity (O 2 ) being greater than said first opacity (O 1 ), said third lightness value (L 3 )being greater than said second lightness value (L 2 ) and said second lightness value (L 2 ) being greater than said first lightness value (L 1 ). forming said third powder into said most opaque ceramic layer on a substrate, forming a second powder into said less opaque ceramic layer on said most opaque ceramic layer, forming said first powder into said least opaque ceramic layer on said less opaque ceramic layer.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said third opacity (O 3 ) is 100 percent opaque.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein said second opacity (O 2 ) is from 94 percent to 99 percent opaque.
Claim 5
Dependent Claim
38 words
The method of claim 1 wherein said third lightness value (L 3 ) and said first lightness value (L 1 ) have a difference in lightness value of less than 2.5 Commission International de 1'E'clairage (CIE) L*a*b* units.
References Cited (Backward Citations)
US3360122A
Cited
US3628248A
Cited
US3628260A
Cited
US3932938A
Cited
US3986777A
Cited
US4096217A
Cited
US3956827A
Cited
US4427501A
Cited
US4115922A
Cited
US4132830A
Cited
US4207678A
Cited
US4294349A
Cited
US4201577A
Cited
US4386962A
Cited
US4481227A
Cited
US4426404A
Cited
US4461618A
Cited
US4626514A
Cited
US4681633A
Cited
US4650418A
Cited
US4650418B1
Cited
US4604366A
Cited
US4828117A
Cited
US4617159A
Cited
US4793805A
Cited
US4802850A
Cited
US5057018A
Cited
US5162130A
Cited
US4810193A
Cited
US5076789A
Cited
US4997723A
Cited
US5186626A
Cited
US5094619A
Cited
US5127835A
Cited
US5004417A
Cited
US5104319A
Cited
US5125970A
Cited
US5240414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-08 | 1999-07-10 | 2000-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-08 | 2003-07-10 | 2004-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-08 | 2007-07-10 | 2008-01-09 | $7700.00 | Window Closed / Lapsed |