EP0234945A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Dental colour shade kit and method of dental shade selection
Assignee: ADA Forsyth Institute Inc
•
Filing: 1987-02-27
•
Granted: —
•
Expires: 2007-02-27
Abstract
Abstract A dental colour shade selection kit and method for the preparation of the correct colour shade of dental prostheses, which method comprises: forming in a recessed tab device (10) a hardened opaque layer; forming a visualizing veneer dental composition layer on top of the opaque layer to permit visualization of the correct colour shade; and matching the veneer dental composition to a natural tooth and to a dental restoration.
Inventors
- 👤 Edwin J. Riley
- 👤 Benjamin H. Amdur
- 👤 Ralph B. Sozio
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 21:20
CPC Classifications
A; A61; A61C; A61C19/00; A61C19/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
199 words
A dental colour-shade selection kit for the selection of a colour-shade for a dental prosthesis, which kit comprises in combination a tab means to provide a recess of the shape of the dental prosthesis to be colour-shade matched and characterized by a transparent peripheral edge which defines a recess of defined depth, an opaque masking composition which comprises a dental procelain opaque powder which closely approximates the shade of the opaque layer of the dental prosthesis to be matched and an inorganic hardening agent for admixture with the said powder to form a hardened opaque layer in the recess of the tab means, and a visualizing veneer dental composition which comprises a porcelain powder mix and a liquid binder, which liquid binder is admixed with the said powder mix or a gel-like composition of the said powder and liquid binder, the liquid binder having an index of refraction the same or substantially the same as the dental porcelain to be colour-shade matched, the visualizing dental composition employed to form a layer in the recess over the opaque layer so as to enable the user to visualize and determine the proper dental comparison and the proper colour-shade prior to sintering.
Claim 2
Dependent Claim
199 words
A dental colour-shade selection kit for the selection of a colour-shade for a dental prosthesis, which kit comprises in combination a tab means to provide a recess of the shape of the dental prosthesis to be colour-shade matched and characterized by a transparent peripheral edge which defines a recess of defined depth, an opaque masking composition which comprises a dental procelain opaque powder which closely approximates the shade of the opaque layer of the dental prosthesis to be matched and an inorganic hardening agent for admixture with the said powder to form a hardened opaque layer in the recess of the tab means, and a visualizing veneer dental composition which comprises a porcelain powder mix and a liquid binder, which liquid binder is admixed with the said powder mix or a gel-like composition of the said powder and liquid binder, the liquid binder having an index of refraction the same or substantially the same as the dental porcelain to be colour-shade matched, the visualizing dental composition employed to form a layer in the recess over the opaque layer so as to enable the user to visualize and determine the proper dental comparison and the proper colour-shade prior to sintering.
Claim 3
Dependent Claim
30 words
A kit as claimed in claim 1, characterized in that the tab means comprises a transparent body characterized by a shovel-like recess to approximate the shape of a dental crown.
Claim 4
Dependent Claim
26 words
A kit as claimed in claim 1 or claim 2, characterized in that the inorganic hardening agent of the opaque composition comprises a sodium silicate solution.
Claim 5
Dependent Claim
31 words
A K it as claimed in any preceding claim, characterized in that the liquid binder comprises an organic liquid binder composition which includes a solution of two or more organic liquids.
Claim 6
Dependent Claim
24 words
A kit as claimed in any preceding claim, characterized in that the liquid binder has an index of refraction of about 1.45 to 1.56.
Claim 7
Dependent Claim
41 words
A kit as claimed in any preceding claim, characterized in that the liquid binder comprises a mixture of liquids to an organic liquid composition, the liquids being selected from the following: benzyl- tert.-butanol, cycloheptanol, succinic acid diethyl ester, and benzyl ether.
Claim 8
Dependent Claim
67 words
A kit as claimed in any preceding claim, characterized in that the tab means comprises a transparent glass or polymeric body material defining a shovel-like recess to approximate a tooth crown with a transparent rim edge of a defined depth of about 1.2mm about the recess, with the tab means secured to an extending handle means for handling of the tab means in the colour-shade matching use.
Claim 9
Independent Claim
179 words
A method for the colour-shade selection of a dental prosthesis, which method comprises providing a tab device having a recess with a shape approximating that of the dental prosthesis and a thickness depth approximating the dental prosthesis to be restored, the recess having a transparent peripheral edge rim, forming a thin hardened layer of an opaque masking composition in the recess, which opaque layer closely approximates the base opaque colour-shade of the dental prosthesis to be restored, forming a layer of a visualizing veneer dental composition over the opaque layer in the recess to the desired rim edge thickness depth, the dental composition comprising an admixture of a veneer dental porcelain powder and a liquid binder, the liquid binder having the same or substantially the same index of refraction as the veneer composition, and matching the colour-shade of the veneer layer in the tab device by visual comparison to the tooth or dental prosthesis to be matched, and optionally, as required, making adjustments to the colour-shade of the veneer dental composition to arrive at a matched dental prosthesis composition.
Claim 10
Independent Claim
179 words
A method for the colour-shade selection of a dental prosthesis, which method comprises providing a tab device having a recess with a shape approximating that of the dental prosthesis and a thickness depth approximating the dental prosthesis to be restored, the recess having a transparent peripheral edge rim, forming a thin hardened layer of an opaque masking composition in the recess, which opaque layer closely approximates the base opaque colour-shade of the dental prosthesis to be restored, forming a layer of a visualizing veneer dental composition over the opaque layer in the recess to the desired rim edge thickness depth, the dental composition comprising an admixture of a veneer dental porcelain powder and a liquid binder, the liquid binder having the same or substantially the same index of refraction as the veneer composition, and matching the colour-shade of the veneer layer in the tab device by visual comparison to the tooth or dental prosthesis to be matched, and optionally, as required, making adjustments to the colour-shade of the veneer dental composition to arrive at a matched dental prosthesis composition.
Claim 11
Dependent Claim
33 words
A method as claimed in claim 8, characterized in that the tab device comprises a transparent shovel-shaped tab device having a recess approximating a tooth crown with a thickness depth of about 1.2mm.
Claim 12
Dependent Claim
39 words
A method as claimed in claim 8, characterized in that the opaque composition comprises a thin layer by mixing an opaque porcelain powder with an inorganic hardening agent and coating the admixed composition on the surface of the recess.
Claim 13
Dependent Claim
18 words
A method as claimed in claim 10, characterized in that the hardening agent comprises a sodium silicate solution.
Claim 14
Dependent Claim
30 words
A method as claimed in claim 8, characterized in that the veneer dental composition comprises an organic liquid binder solution having an index of refraction of about 1.45 to 1.56.
Claim 15
Dependent Claim
42 words
A method as claimed in claim 8, characterized in tht the liquid binder of the veneer dental composition comprises an admixture of volatile organic liquids selected from the group consisting of: benzyl- tert.-butanol, cycloheptanol, succinic acid diethyl ether, ester, and benzyl ether.
Claim 16
Dependent Claim
53 words
A method as claimed in claim 8, characterized by providing a tab device comprising a transparent body material not affected by the liquid binder of the veneer dental composition and having a handling means to permit the tab device to be held for direct colour-shade comparison to the dental prosthesis to be restored.
Claim 17
Dependent Claim
23 words
A method as claimed in claim 8, characterized by preparing the dental prosthesis to the composition as determined by the colour-shade matching step.
Claim 18
Dependent Claim
29 words
A tab device containing the thin hardened layer of opaque composition and the layer of veneer dental composition produced by the method of any of claims 8 to 15.
Claim 19
Dependent Claim
89 words
A tab device for use in preparing colour-shade matched dental prosthesis, which tab device comprises a body composed of a transparent material which is not substantially affected by an organic liquid binder employed with the tab device, the body having a transparent peripheral edge lip defines a recess of defined depth and shape of the dental prosthesis to be restored, and a handling means secured to the body to permit direct colour-shade matching of the tab device containing the veneer porcelain composition with the dental prosthesis to be restored.
Claim 20
Dependent Claim
89 words
A tab device for use in preparing colour-shade matched dental prosthesis, which tab device comprises a body composed of a transparent material which is not substantially affected by an organic liquid binder employed with the tab device, the body having a transparent peripheral edge lip defines a recess of defined depth and shape of the dental prosthesis to be restored, and a handling means secured to the body to permit direct colour-shade matching of the tab device containing the veneer porcelain composition with the dental prosthesis to be restored.
Claim 21
Dependent Claim
23 words
A tab device as claimed in claim 17, characterized in that the tab device is composed of glass or a transparent polymeric material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.