EP0686378A2
Expired / Lapsed
EP
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Dental porcelain shading kit, system and method
Assignee: Ceramco Inc
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Filing: 1995-06-02
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Granted: —
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Expires: 2015-06-02
Abstract
Abstract The invention provides a kit, system and 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 (L₁) when formed into a least opaque porcelain layer. The second powder has a lightness value (L₂) when formed into a less opaque ceramic layer. The third powder has a lightness value (L₃) when formed into a 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 differences between the third lightness value (L₃) and the first lightness value (L₁) are less than 2.5 CIE L*a*b units. Preferably, the first powder has a first hue (H₁) when formed into the least opaque porcelain layer, the second powder has a second hue (H₂) when formed into the less opaque ceramic layer, and the third powder has a third hue (H₃) when formed into the most opaque ceramic layer. Preferably the first hue (H₁) and the second hue (H₂) are within 5 degrees of the CIE psychometric hue angle of the third hue (H₃).
Inventors
- 👤 Carolyn M. Kramer
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 01:44
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: 18
Claim 1
Independent Claim
164 words
A kit for the preparation of porcelain dental restorations having a most opaque ceramic layer underlying a less opaque ceramic layer positioned beneath a least opaque porcelain layer, comprising: a first powder enclosed by a first labeled container and having a first opacity (O₁), and a first lightness value (L₁) when formed into said least opaque porcelain layer, a second powder enclosed by a second labeled container having a second opacity (O₂) and a second lightness value (L₂) when formed into said less opaque ceramic layer, and a third powder enclosed by a third labeled container having a third opacity (O₃) and a third lightness value (L₃) when formed into said most opaque ceramic layer, said third opacity (O₃) being greater than said second opacity (O₂), said second opacity (O₂) being greater than said first opacity (O₁), said third lightness value (L₃) being greater than said second lightness value (L₂) and said second lightness value (L₂) being greater than said first lightness value (L₁).
Claim 2
Dependent Claim
14 words
The kit of claim 1 wherein said third opacity (O₃) is 100 percent opaque.
Claim 3
Dependent Claim
18 words
The kit of claim 2 wherein said second opacity (O₂) is from 94 percent to 99 percent opaque.
Claim 4
Dependent Claim
30 words
The kit of claim 1 wherein said third lightness value (L₃) and said first lightness value (L₁) have a difference in lightness value of less than 2.5 CIE L*a*b* units.
Claim 5
Dependent Claim
45 words
The kit of claim 2 wherein said first powder has a first chroma (C₁) and said third powder has a third chroma (C₃) and said third chroma (C₃) and said first chroma (C₁) have a difference in chroma of less than 3 CIE L*a*b* units.
Claim 6
Dependent Claim
80 words
The kit of claim 1 wherein said first powder has a first hue (H₁) when formed into said least opaque porcelain layer, said second powder has a second hue (H₂) when formed into said less opaque ceramic layer, said third powder has a third hue (H₃) when formed into said most opaque ceramic layer, each of said first hue (H₁) and said second hue (H₂) being within 5 degrees of the CIE psychometric hue angle of said third hue (H₃).
Claim 7
Dependent Claim
17 words
The kit of claim 1 wherein said first, second and third powder each comprises an inorganic pigment.
Claim 8
Independent Claim
166 words
A system of dental porcelain powders for making crowns and bridges having a most opaque ceramic layer underlying a less opaque ceramic layer positioned beneath a least opaque porcelain layer, comprising: a first powder enclosed by a first labeled container and having a first opacity (O₁), and a first lightness value (L₁) when formed into said least opaque porcelain layer, a second powder enclosed by a second labeled container having a second opacity (O₂) and a second lightness value (L₂) when formed into said less opaque ceramic layer, and a third powder enclosed by a third labeled container having a third opacity (O₃) and a third lightness value (L₃) when formed into said most opaque ceramic layer, said third opacity (O₃) being greater than said second opacity (O₂), said second opacity (O₂) being greater than said first opacity (O₁), said third lightness value (L₃) being greater than said second lightness value (L₂) and said second lightness value (L₂) being greater than said first lightness value (L₁).
Claim 9
Dependent Claim
29 words
The system of claim 8 wherein the lightness value difference between said third lightness value (L₃) and said first lightness value (L₁) are less than 2.5 CIE L*a*b units.
Claim 10
Dependent Claim
84 words
The system of dental porcelain powders of claim 8 wherein said first powder has a first hue (H₁) when formed into said least opaque porcelain layer, said second powder has a second hue (H₂) when formed into said less opaque ceramic layer, said third powder has a third hue (H₃) when formed into said most opaque ceramic layer, each of said first hue (H₁) and said second hue (H₂) being within 5 degrees of the CIE psychometric hue angle of said third hue (H₃).
Claim 11
Dependent Claim
100 words
The system of dental porcelain powders of claim 8 wherein said first powder has a chroma (C₁) when formed into said least opaque porcelain layer, said second powder has a chroma (C₂) when formed into said less opaque ceramic layer, said third powder has a chroma (C₃) when formed into said most opaque ceramic layer, each of said third chroma (C₃) being greater than said second chroma (C₂) and said second chroma (C₂) being greater than said first chroma (C₁), and the difference between said third chroma (C₃) and said first chroma (C₁) being less than 10 CIE L*a*b* units.
Claim 12
Dependent Claim
137 words
The system of dental porcelain powders of Claim 8 further comprising a second set of powders, said second set of powders comprising a first powder (P 1s ) having a first lightness value (L 1s ) when formed into said least opaque porcelain layer, a second powder (P 2s ) having a second lightness value (L 2s ) when formed into said less opaque ceramic layer, a third powder (P 3s ) having a third lightness value (L 3s ) when formed into said most opaque ceramic layer, said first lightness value (L 1S ) being less than said second lightness value (L 2S ) by less than 3 CIE L*a*b* units and said first lightness value (L 1S ) being less than said third lightness value (L 3S ) by less than 3 CIE L*a*b* units.
Claim 13
Dependent Claim
124 words
The system of dental porcelain powders of Claim 12 wherein said second set first powder (P 1s ) has a first (H 1s ) hue when formed into said least opaque porcelain layer, said second set second powder (P 2s ) has a second hue (H 2s ) when formed into said less opaque ceramic layer, said second set third powder (P 3s ) has a third hue (H 3s ) when formed into said most opaque ceramic layer, said first hue (H 1S ) being within 5 degrees of CIE psychometric hue angle of said second hue (H 2S ) and said first hue (H 1S ) being within 5 degrees of CIE psychometric hue angle of said third hue (H 3S ).
Claim 14
Dependent Claim
53 words
The system of dental porcelain powders of Claim 12 wherein said second set third lightness value (L 3S ) is greater than said second set second lightness value (L 2S ) and said second set second lightness value (L 2S ) is greater than said second set first lightness value (L 1S ).
Claim 15
Independent Claim
209 words
A method of making a porcelain dental prosthesis, having 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 (O₁), and a first lightness value (L₁) when formed into said least opaque porcelain layer, a second powder enclosed by a second labeled container having a second opacity (O₂) and a second lightness value (L₂) when formed into said less opaque ceramic layer, and a third powder enclosed by a third labeled container having a third opacity (O₃) and a third lightness value (L₃) when formed into said most opaque ceramic layer, said third opacity (O₃) being greater than said second opacity (O₂), said second opacity (O₂) being greater than said first opacity (O₁), said third lightness value (L₃) being greater than said second lightness value (L₂) and said second lightness value (L₂) being greater than said first lightness value (L₁). 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 16
Dependent Claim
14 words
The method of claim 15 wherein said third opacity (O₃) is 100 percent opaque.
Claim 17
Dependent Claim
18 words
The method of claim 16 wherein said second opacity (O₂) is from 94 percent to 99 percent opaque.
Claim 18
Dependent Claim
30 words
The method of claim 15 wherein said third lightness value (L₃) and said first lightness value (L₁) have a difference in lightness value of less than 2.5 CIE L*a*b* units.
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