Kit of parts containing dental mill blank colouring solution

Patent metadata

Field	Value
Publication number	US-2017216000-A1
Application number	US-201515500442-A
Country	US
Kind code	A1
Filing date	Jul 30, 2015
Priority date	Jul 31, 2014
Publication date	Aug 3, 2017
Grant date	—

Abstract

The present invention relates to a kit of parts comprising a dental mill blank comprising a porous zirconia material and a colouring solution for colouring the porous zirconia material. The porous zirconia material comprises Zr oxide calculated as ZrO2: from 80 to 97 wt.-%, Al oxide calculated as Al2O3: from 0 to 0.15 wt.-%, Y oxide calculated as Y2O3: from 1 to 10 wt.-%, Bi oxide calculated as Bi2O3: from 0.01 to 0.2 wt.-%, the porous zirconia material not comprising Fe calculated as Fe2O3 in an amount of more than 0.01 wt.-%, wt.-% with respect to the weight of the porous zirconia material. The colouring solution comprises solvent(s), colouring agent(s) comprising metal ions selected from Tb, Er, Pr, Mn or combinations thereof, the solution not comprising Fe ions in an amount of more than 0.01 wt.-%, the solution not comprising Bi ions in an amount of more than 0.01 wt.-%, wt.-% with respect to the weight of the colouring solution. The invention also relates to a process of producing a dental restoration, the process comprising the steps: providing a dental mill blank comprising a porous zirconia material as described in any of the preceding claims, machining an article out of the porous zirconia material, the article having the shape of a dental restoration with an outer and inner surface, providing a colouring solution as described in any of the preceding claims, applying the colouring solution to at least portions of the surface of the article having the shape of a dental restoration.

First claim

1 . A kit of parts comprising:
a dental mill blank comprising a porous zirconia material; a colouring solution for colouring the porous zirconia material;
wherein the porous zirconia material comprises:
Zr oxide calculated as ZrO2: from 80 to 97 wt.-%;
Al oxide calculated as Al2O3: from 0 to 0.15 wt.-%;
Y oxide calculated as Y2O3: from 1 to 10 wt.-%;
Bi oxide calculated as Bi2O3: from 0.01 to 0.2 wt.-%; and

the porous zirconia material not comprising Fe calculated as Fe2O3 in an amount of more than 0.01 wt.-%, wherein wt.-% with respect to the weight of the porous zirconia material; and
the colouring solution comprising:
solvent(s);
colouring agent(s) comprising metal ions selected from Tb, Er, Pr, Mn or combinations thereof;

the solution not comprising Fe ions in an amount of more than 0.01 wt.-%; and
the solution not comprising Bi ions in an amount of more than 0.01 wt.-%,
wherein wt.-% with respect to the weight of the colouring solution.

2 . The kit of parts of claim 1 , the kit of parts further comprising an instruction of use containing the process steps of applying the colouring solution to at least parts of the surface of an article having been machined out of the porous zirconia material, and wherein the article has the shape of a dental restoration.

3 . The kit of parts of claim 1 , the colouring solution not comprising at least one of the following:
ions selected from Dy, Sm, Eu, Cr, Cu, V, Mo and combinations thereof, each in an amount above 0.01 wt.-% with respect to the weight of the solution; non-soluble particles selected from SiO2, TiO2, ZrO2 and mixtures thereof.

4 . The kit of parts of claim 1 , the colouring solution comprising in addition at least one of the following components:
complexing agent(s); thickening agent(s); marker substance(s); additive(s); and mixtures thereof.

5 . The kit of parts of claim 1 , the colouring solution being characterized by at least one of the following features:
pH value: 0 to 9, if the solution contains water; viscosity: 1 to 2,000 mPa*s at 23° C.; being transparent; being coloured; being storage stable.

6 . The kit of parts of claim 1 , the porous zirconia material not comprising at least one of the following components:
colouring ion(s) selected from Tb, Er, Pr, Mn, Cu, Cr, V, Mo, Co in an amount of more than 0.01 wt.-% with respect to the weight of the porous zirconia material; glass; glass ceramic; lithium (di)silicate ceramic;
or combinations thereof.

7 . The kit of parts of claim 1 , the porous zirconia material fulfils at least one or all of the following parameters:
(a) not showing a N2 adsorption and/or desorption isotherm with a hysteresis loop; (b) average grain size: less than about 100 nm or less than about 80 nm or less than about 60 nm; (c) BET surface: from 2 to 20 m2/g; (d) biaxial flexural strength: from 8 to 80 MPa; (e) Vickers hardness: from 25 (HV 0.5) to 150 (HV 1).

8 . The kit of parts of claim 1 , the porous zirconia material fulfilling at least one or all of the following parameters:
(a) showing a N2 adsorption and/or desorption isotherm with a hysteresis loop; (b) showing a N2 adsorption and desorption of isotherm type IV according to IUPAC classification and a hysteresis loop; (c) showing a N2 adsorption and desorption isotherm of type IV with a hysteresis loop of type H1 according to IUPAC classification; (d) showing a N2 adsorption and desorption isotherm of type IV with a hysteresis loop of type H1 according to IUPAC classification in a p/po range of 0.70 to 0.95; (e) average connected pore diameter: from 10 to 100 nm; (f) average grain size: less than about 100 nm; (g) BET surface: from 10 to 200 m2/g; (h) biaxial flexural strength: from 10 to 70 MPa; (i) Vickers hardness: from 25 (HV 0.5) to 150 (HV 1).

9 . The kit of parts of claim 1 , the dental mill blank being characterized by at least one of the following features:
shape: cubic or cylindric or disc; size: for a cubic shape: more than 19 mm in x, y and z dimension; for a cylindric shape: more than 19 mm in diameter, more than 19 mm in length; comprising means for attaching the dental mill blank to a machining device.

10 . The kit of parts according to claim 1 ,
the dental mill blank being characterized as follows:
having the shape of a cubic, cylinder or disc;
comprising means for attaching the dental mill blank to a machining device;
the porous zirconia material being characterized as follows:
x, y, z dimension: at least 19 mm;
Density: 30 to 95% of theoretical density;
Shrinkage behaviour: isotropic;
the porous zirconia material comprising:
Zr oxide calculated as ZrO2: from 80 to 97 wt.-%;
Al oxide calculated as Al2O3: from 0 to 0.15 wt.-%;
Y oxide calculated as Y2O3: from 1 to 10 wt.-%;
Bi oxide calculated as Bi2O3: from 0.01 to 0.20 wt.-%;
the porous zirconia material not comprising:
Fe oxide calculated as Fe2O3 in an amount of more than 0.01 wt.-%;
Tb oxide calculated as Tb2O3 in an amount of more than 0.01 wt.-%;
Er oxide calculated as Er2O3 in an amount of more than 0.01 wt.-%;
Mn oxide calculated as MnO2 in an amount of more than 0.01 wt.-%;
a glass, glass ceramic or lithium disilicate material,
wherein wt.-% with respect to the weight of the porous zirconia material; the colouring solution being characterized as follows:
containing water as solvent in an amount of 20 to 95 wt.-%;
containing colouring agent(s) comprising ions of Tb, Er, Mn or combinations thereof in an amount of 0.2 to 8 wt.-%, calculated with respect to the weight of the metal ions;
the solution not comprising Fe ions in an amount above 0.01 wt.-%;
the solution not comprising Bi ions in an amount above 0.01 wt.-%;
the solution not comprising ions selected from Dy, Sm, Eu, Cr, Cu, V, Mo or combinations thereof in an amount above about 0.01 wt.-%;
wt.-% with respect to the weight of the solution;
the colouring solution having a pH value in the range of 0 to 9; and
the colouring solution having a viscosity in the range of 1 to 2,000 mPa*s at 23° C.

11 . A process of producing a dental restoration, the process comprising:
providing a dental mill blank comprising a porous zirconia material of claim 1 ; machining an article out of the porous zirconia material, the article having the shape of a dental restoration with an outer and inner surface; providing a colouring solution as described in claim 1 ; applying the colouring solution to at least portions of the outer surface of the article having the shape of a dental restoration; optionally drying the article; and optionally sintering the article to obtain a sintered dental restoration.

12 . The process of claim 11 , wherein the dental restoration has the shape of a crown, bridge, inlay, onlay, veneer, facing, coping, crown and bridged framework, implant, abutment, orthodontic appliances or a part thereof.

Assignees

• 3M Innovative Properties Co

Inventors

• Jahns Michael
• Schnagl Hans R

Classifications

• A61K6/824

  comprising transition metal oxides · CPC title

• A61K6/78 Primary

  Pigments · CPC title

• A61K6/891

  Compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• A61K6/833

  Glass-ceramic composites · CPC title

• A61K6/818

  comprising zirconium oxide · CPC title