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Aluminosilicate glass and color adapting composition for ceramics

a technology of aluminosilicate glass and composition, applied in the field of aluminosilicate glass and color adapting composition for ceramics, to achieve the effects of good color stability of coloring materials, low linear thermal expansion coefficient, and high linear thermal expansion coefficien

Inactive Publication Date: 2009-09-10
SHOFU INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0042]The porcelain stain according to the present invention may be widely applied to from metal ceramic crown porcelain having higher linear thermal expansion coefficients to alumina core crown porcelain having lower linear thermal expansion coefficients.
[0043]That is, the porcelain stain according to the present invention is not limited by the linear thermal expansion coefficient of a variety of dental porcelain for basements, and may be applied and sintered without generating peeling or breaking to favorably produce aesthetically excellent crown restorations
[0044]Since the sintering temperature of the porcelain stain according to the present invention can be adjusted to temperatures lower than sintering temperatures of a variety of dental porcelains, a coloring process can be carried out at low temperatures at which basement restorations never deform.
[0045]Since the porcelain stain according to the present invention comprises an aluminosilicate glass as a main component, development of fluorescent materials and color stability of coloring materials are good and it has excellent properties for development of a color of a crown after sintering.
[0046]The porcelain stain according to the present invention may be used without any problem even when a content of colored glass is increased in order to heighten a pigment concentration and it is capable of exhibiting various colors.
[0047]Further, since the porcelain stain according to the present invention is produced by making a paste with finely-ground powder, it is adaptable with any basements for metal ceramic and all ceramic crown restorations and can be fused in a thin layer.

Problems solved by technology

Japanese patent No. 4006230 discloses a stain powder and a glazing powder for coloring or glazing full ceramic crowns, but these powders are limited to be used in diopside glass ceramics having a linear thermal expansion coefficient of 4-6×10−6 K−1.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0075]The present invention will be further explained with referring to Examples and Comparative Examples, but the present invention is never limited to these Examples and Comparative Examples.

[0076]Evaluation methods for sintering temperatures, thermal expansion coefficients and fusing properties of compositions, porcelains and the like in the Examples and Comparative Examples are shown below.

(Evaluation of Sintering Temperature)

[0077]Each of the porcelain stains in Examples and Comparative Examples was kneaded with distilled water and the kneaded material was filled into a button-shaped silicone mold (3 mm×10 mm diameter). Then, the button-like mold was vibrated with a ultrasonic vibrator Ceramosonic Condenser (manufactured by Shofu Inc.), a building-up spatula or the like to percolate water from the kneaded material in a wet state in order to increase the powder tap density (condensation), and the percolated water was absorbed with tissue paper and the like. A molded form was obt...

examples 1-5

, Comparative Examples 1-3

[0095]Adjusting and blending were performed to manufacture Glasses 1-5 (Examples 1-5) and Glasses 6-8 (Comparative Examples 1-3) so as to have oxide compositions shown in Table 1.

[0096]Results of sintering temperatures, linear thermal expansion coefficients in a range of 25-500° C., fusing properties and chemical solubility for the obtained glasses are shown in Table 2.

TABLE 1SiO2B2O3Al2O3Li2ONa2OK2OCaOMgOSb2O3P2O5Glass 167.812.57.21.04.84.41.30.50.50.0Glass 265.09.37.61.05.65.75.00.50.30.0Glass 363.411.08.20.57.05.43.40.70.40.0Glass 469.89.57.41.04.74.72.40.10.40.0Glass 561.616.76.80.86.25.02.30.10.50.0Glass 655.26.017.30.57.67.95.20.30.00.0Glass 756.55.87.00.021.81.12.13.50.02.2Glass 862.20.015.40.06.913.91.00.60.00.0

TABLE 2SinteringLinear thermaltemperatureexpansion coefficientFusingChemical(° C.)(×10−6 K−1)propertiessolubilityGlass 18406.1◯◯Glass 28206.9◯◯Glass 38406.8◯◯Glass 48205.8◯◯Glass 57806.9◯◯Glass 68809.1◯◯Glass 778011.1X◯Glass 888015.0X◯

[0097]G...

example 6-11

, Comparative Example 4-6

[0100]The porcelain stains 1-6 having compositions shown in Table 4 (Example 6-11) were manufactured by blending the Glass 1 (Example 1) having a sintering temperature of 840° C., the Glass 5 (Example 5) having a sintering temperature of 780° C. and the colored glass shown in Table 3.

[0101]In addition, the porcelain stains 7-8 having compositions shown in Table 4 (Comparative Example 4-6) were manufactured by blending the Glass 6 having a sintering temperature of 880° C. (Comparative Example 1) and the colored glass shown in Table 3.

[0102]Results of sintering temperatures, linear thermal expansion coefficients in a range of 25-500° C. and fusing properties for the obtained porcelain stains are shown in Table 5.

TABLE 3SinteringLinear thermaltemperatureexpansion coefficientColor(° C.)(×10−6 K−1)Colored glass AYellow9807.4Colored glass BPink10008.0Colored glass CBrown9008.4Colored glass DBlack9008.7

TABLE 4GlassColoredColoredColoredColored1Glass 5Glass 6glass Ag...

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Abstract

The present invention relates to a color adapting composition used for coloring and color adapting porcelain for ceramic crown such as dental restorations and prosthetics, and aluminosilicate glass appropriate for using in a color adapting composition. More specifically, a color adapting composition for dental porcelains are prepared by blending two or more kinds of glass frits having different sintering temperatures from each other and an inorganic pigment or a colored glass obtained by previously dispersing inorganic pigments in glass.

Description

TECHNICAL FIELD OF THE INVENTION [0001]The present invention relates to a color adapting composition used for coloring and color adapting ceramic crown porcelain such as dental restorations and prosthetics, and aluminosilicate glass appropriate for using in a color adapting composition.BACKGROUND ART [0002]Crown restorations providing aesthetics similar to natural teeth include metal ceramic dental restorations and all ceramic dental restorations, both of which are formed with dental porcelain. When these dental restorations are formed, techniques are used for expressing white bands, and stains around cervical portions and proximal surfaces, hair lines, enamel cracks and the like on natural teeth to mimic natural teeth. For this, color-adapting compositions used in ceramic crown porcelain (hereinafter sometimes referred to as “porcelain stain”) is used.[0003]Porcelain stains comprise matrix glass and inorganic pigments for coloring.[0004]Generally, techniques for coloring crown rest...

Claims

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Application Information

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IPC IPC(8): C03C14/00C03C3/091A61C5/77
CPCA61K6/0094A61K6/0276C03C8/14C03C4/0021C03C8/02C03C3/091A61K6/836A61K6/78
Inventor FUKATANI, YUKIOTAKAHASHI, KEIJIYOSHIMOTO, RYUICHI
Owner SHOFU INC
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