Fluorescent glazing composition for a dental zirconia article, process of sintering and kit of parts

Patent metadata

Field	Value
Publication number	US-12121599-B2
Application number	US-201917273048-A
Country	US
Kind code	B2
Filing date	Aug 30, 2019
Priority date	Sep 4, 2018
Publication date	Oct 22, 2024
Grant date	Oct 22, 2024

Abstract

The invention relates to a glazing composition for a porous dental zirconia article, the glazing composition comprising liquid, glass particles, fluorescing component(s) comprising europium, optionally hydrophilic silica nano-particles, and optionally hydrophobic silica nano-particles, wherein the fluorescing component(s) can be contained in the glass particles or as separate component. The invention also relates to a process for sintering a porous dental zirconia article with a glazing composition on its surface.

First claim

The invention claimed is:

1. A glazing composition for a porous dental zirconia article, the glazing composition comprising
liquid,
glass particles present in an amount of 5 wt % to 40 wt % with respect to the weight of the glazing composition,
wherein if the glass particles comprise Li 2 O, the Li 2 O is present in an amount of no more than 0.1 mol %,

fluorescing component(s) comprising europium,
wherein the fluorescing component(s) can be contained in the glass particles or as separate component,

optionally hydrophilic silica nano-particles, and
optionally hydrophobic silica nano-particles.

2. The glazing composition according to claim 1 , the ratio of glass particles to europium being in a range of 1,000:1 to 20:1 with respect to weight.

3. The glazing composition according to claim 1 , the liquid selected from water, alcohols, polyols, and a combination thereof.

4. The glazing composition according to claim 1 , the glass particles comprising one or more of the following compositions:

1
2
3
4
5
6
7

SiO 2
80 to 98
80 to 98
80 to 98
80 to 98
80 to 98
85 to
80 to

98
98

B 2 O 3
0 to 15
0 to 15
2 to 15

2 to 15

Na 2 O
0 to 5
0 to 5

K 2 O
0 to 5
0 to 5

0.1 to 5
0.1 to 5

5 to 10

Al 2 O 3
0 to 5
0 to 5
0.1 to 5
0.1 to 5
0.1 to 5

8 to 12

La 2 O 3
0 to 1
0 to 1

MgO
0 to 5
0 to 5

0.1 to 5
0.1 to 5

CaO
0 to 2
0 to 2

SrO
0 to 2
0 to 2

BaO
0 to 2
0 to 2

Bi 2 O 3
0 to 0.5
0 to 0.5

Eu 2 O 3
0 to 1
0.05 to 1

0 to 1

wherein the amounts are given in mol %.

5. The glazing composition according to claim 4 , the glass particles being characterized by one or more of:
viscosity: at least 10 4 Pa*s at a temperature of 1,300° C.;
coefficient of thermal expansion: 1*10 −6 K −1 to 10*10 −6 K −1 ;
surface tension: of 210 to 300 mN/m at 1,300° C.;
Littleton softening point viscosity at a temperature of 1,100° C. to 1,350° C.;
flow point viscosity at a temperature of 1,300° C. to 1,650° C.; and
particle size (D 50 ): 1 to 40 μm,
wt. % with respect to the weight of the glazing composition.

6. The glazing composition according to claim 1 , the fluorescing component(s) characterized by one or more of:
being present in an amount of 0.1 to 5 wt. % with respect to the weight of the whole composition calculated with respect to the amount of europium;
particle size (D 50 ): 1 to 40 μm; and
being selected from oxides, hydroxides or carbonates of Eu.

7. The glazing composition according to claim 1 , comprising:
the liquid present in an amount of 50 to 95 wt. %,
the fluorescing component(s) present in an amount of 0.1 to 5 wt. % calculated with respect to the amount of europium,
the hydrophilic silica nano-particles present in an amount of 0 to 5 wt. %, and
the hydrophobic silica nano-particles present in an amount of 0 to 5 wt. %; and further comprising:
a rheological additive present in an amount of 0 to 1 wt. %,
an organic colorant present in an amount of 0 to 0.5 wt. %,

wt. % with respect to the weight of the glazing composition.

8. The glazing composition according to claim 1 , comprising hydrophilic silica nano-particles, the hydrophilic silica nano-particles being characterized by one or more of:
particle size (D 50 ): 10 to 70 nm;
BET surface: 20 to 500 m 2 /g; and
being present in an amount of 0.1 to 5 wt. %,
wt. % with respect to the weight of the glazing composition.

9. The glazing composition according to claim 1 , being characterized by one or more of:
viscosity: 10 to 2,500 mPa*s at 23° C.; and
pH value: 6 to 9.

10. The glazing composition according to claim 1 , wherein:
the liquid is selected from water, an alcohol, a polyol, and a combination thereof,
the liquid is present in an amount of 50 to 95 wt. %,
the glass particles are characterized by a particle size (D 50 ) of 1 to 40 μm
the glass particles characterized by a viscosity of 10 4 to 10 7 Pa*s at 1,300° C.,
the fluorescing component(s) is present in an amount of 0.1 to 5 wt. % calculated with respect to the amount of europium,
the hydrophilic silica nano-particles are present in an amount of 0 to 5 wt. %, and
the hydrophobic silica nano-particles are present in an amount of 0 to 5 wt. %,
wt. % with respect to the weight of the glazing composition.

11. The glazing composition of claim 1 , the glass particles comprising SiO 2 in an amount of at least 80 wt %.

12. The glazing composition of claim 1 , the glass particles characterized by a particle size (D 50 ) of 1 to 40 μm.

Assignees

• 3M Innovative Properties Company
• Solventum Intellectual Properties Company

Inventors

• Jahns Michael
• Rolf Jacqueline C
• Goetzinger Martin
• Hauptmann Holger

Classifications

• A61K6/836

  Glass · CPC title

• C03C2204/00

  Glasses, glazes or enamels with special properties · CPC title

• C03C4/12

  for luminescent glass; for fluorescent glass · CPC title

• C03C4/0021

  for dental use · CPC title

• C03C2205/06

  for dental use · CPC title