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Process for producing a sintered lithium disilicate glass ceramic dental restoration and kit of parts

a technology of lithium disilicate glass ceramic and dental restoration, which is applied in glass making apparatus, manufacturing tools, impression caps, etc., can solve the problems of limited possibilities, limited productivity of current process, and inability to apply dry milling process to produce dental restorations

Inactive Publication Date: 2017-05-11
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text discusses the production of dental restorations using a material called lithium disilicate. It is desirable to be able to create these restorations that can be individuallyized with respect to color. The text explains that lithium silicate glass ceramic, which contains quartz, lithium dioxide, phosphorous oxide, and alumina, can be used to create these restorations. It is also mentioned that the material can be converted into lithium disilicate glass ceramic by a heating step after machining. The technical effect of this patent is the ability to create dental restorations that are easy to individualize and have improved strength and toughness.

Problems solved by technology

Due to presence of lithium metasilicate as main crystalline phase in the dental milling block, applying a dry milling process for producing a dental restoration is not possible.
The current process has a limited productivity due to its restriction to wet grinding and offers only limited possibilities for the dental technician to individualize the desired dental article especially with respect to colors and their distribution.

Method used

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  • Process for producing a sintered lithium disilicate glass ceramic dental restoration and kit of parts
  • Process for producing a sintered lithium disilicate glass ceramic dental restoration and kit of parts
  • Process for producing a sintered lithium disilicate glass ceramic dental restoration and kit of parts

Examples

Experimental program
Comparison scheme
Effect test

example 1 (

Non-Colored Lithium Disilicate Ceramic Disc)

[0258]The following amounts of powder were mixed in a bottle: 72.1 wt.-% SiO2, 15.1 wt.-% Li2CO3, 3.4 wt.-% Li3PO4, 3.5 wt.-% Al(OH)3, 3.2 wt.-% K2CO3 and 2.7 wt.-% ZrO2.

In a next step the powder mixture was melted in a platinum crucible at 1500° C. and fitted in water. This was repeated three times. Afterwards the frit was milled. The resulting glass powder had the following particle size distribution: d50: 13.5 μm (d10: 2.5 μm, d90: 49.6 μm).

[0259]The powder was mixed with 10 wt.-% water and pressed to discs (dimensions: 20 mm×1.5 mm) or blocks (dimensions: 12 mm×14 mm×18 mm) by applying a pressure of 7.5 MPa).

[0260]Glass ceramic bodies with 98-100% theoretical density were achieved with the following one step crystallization and sintering program:[0261]Heating with 5 K / min to 730° C.;[0262]Holding at 730° C. till Vacuum on;[0263]Heating with 10 K / min to 930° C.;[0264]Holding time 10 min;[0265]Cooling with 10 K / min to 730° C.;[0266]Holdi...

example 2 (

Colored Lithium Disilicate Ceramic Disc)

[0274]A disc as described in Example 1 was prepared. The disc was pre-sintered at 550 to 650° C. to obtain a porous body.

[0275]The porous body was colored by immersing it in commercially available coloring liquids or by applying commercially available coloring liquids with a brush to its surface (Lava™ Plus Coloring Liquids and / or Lava™ Plus Effect Shades; 3M ESPE).

[0276]After sintering, a colored lithium disilicate glass ceramic was obtained, which has been colored in the amorphous and porous state (i.e. before sintering). The sample obtained is shown in FIG. 2 on the right side. For comparison, the left disc is non-colored.

example 3 (

Dental Restorations)

[0277]A crown was machined out of a pre-sintered dental milling block obtained as described in Example 1 using a Lava™ CNC 500 milling machine (3M ESPE). A picture of the crown machined from a dental milling block made of a pre-sintered lithium silicate material is shown in FIG. 3.

[0278]Similarly, an inlay was machined out of a pre-sintered block obtained as described in Example 1 using a Sirona CEREC™ inLab.

[0279]In FIG. 4 a sintered lithium disilicate crown is shown. The crown was produced by machining it out of a pre-sintered block, coloring the obtained crown in a pre-sintered stage as described in Example 2 and sintering the crown in one step applying the conditions described in Example 1.

[0280]The crown was sintered without using a sintering support. The obtained sintered dental restoration did not show any relevant distortion.

[0281]FIG. 5 shows an inlay produced in the same manner as the crown above.

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Abstract

The present invention is directed to a process for producing a sintered lithium disilicate glass ceramic dental restoration out of a porous 3-dim article, the process comprising the step of sintering the porous 3-dim article having the shape of a dental restoration with an outer and inner surface to obtain a sintered lithium disilicate ceramic dental restoration, the sintered lithium disilicate glass ceramic dental restoration comprising—Si oxide calculated as SiO2 from 55 to 80 wt.-%, —Li oxide calculated as Li2O from 7 to 16 wt.-%, —Al oxide calculated as Al2O3 from 1 to 5 wt.-%, and—P oxide calculated as P2O5 from 1 to 5 wt.-%, wt.-% with respect to the weight of the dental restoration, the sintering being done under reduced atmospheric pressure conditions, the reduced atmospheric pressure conditions being applied at a temperature above 600° C. The present invention is also directed to a kit of parts comprising a porous 3-dim article having the shape of a dental milling block and a respective instruction of use.

Description

FIELD OF THE INVENTION[0001]The invention relates to a process for producing a sintered lithium disilicate glass ceramic dental restoration out of a porous 3-dim article. The process comprises the step of sintering the porous 3-dim article having the shape of a dental restoration with an outer and inner surface to obtain a sintered lithium disilicate ceramic dental restoration.BACKGROUND ART[0002]Lithium disilicate glass ceramics are widely used in the dental industry since many years, because the material is said to have a sufficient strength (e.g. about 400 MPa) and good aesthetic properties (mainly high translucency) after sintering.A dental milling block out of that material is typically provided as follows:A powder mixture of oxide and colorants, if desired, is melted, casted into a mould, and cooled, resulting in a dense glass body.[0003]The dense glass body is then heat treated in a first crystallization step resulting in a dense part containing lithium metasilicate as main c...

Claims

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Application Information

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IPC IPC(8): A61C13/00A61C13/083C03B19/01C03B19/06C03C19/00C03C17/00B33Y10/00B33Y70/00B33Y80/00C03C10/00C03C4/00C03C8/08C03C3/097A61K6/02A61K6/06A61K6/00A61C5/77
CPCA61C13/0006C03C2205/06A61C5/77A61C13/083C03B19/01C03B19/06C03C19/00C03C17/001B33Y10/00B33Y70/00B33Y80/00C03C10/0027C03C4/0021C03C8/08C03C3/097A61K6/025A61K6/0662A61K6/0002A61K6/0094C03C2217/485C03C2218/111C03C2218/114C03C2204/00A61C13/0022A61C5/70A61C13/0004A61K6/15A61K6/16A61K6/822A61K6/871A61K6/78A61K6/853A61K6/818
Inventor MAYR, HELMUTSCHECHNER, GALLUS
Owner 3M INNOVATIVE PROPERTIES CO
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