WO2020007744A1 - Vitrocéramique sans potassium - Google Patents

Vitrocéramique sans potassium Download PDF

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Publication number
WO2020007744A1
WO2020007744A1 PCT/EP2019/067405 EP2019067405W WO2020007744A1 WO 2020007744 A1 WO2020007744 A1 WO 2020007744A1 EP 2019067405 W EP2019067405 W EP 2019067405W WO 2020007744 A1 WO2020007744 A1 WO 2020007744A1
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WO
WIPO (PCT)
Prior art keywords
glass ceramic
weight
starting components
lithium
lithium silicate
Prior art date
Application number
PCT/EP2019/067405
Other languages
German (de)
English (en)
Inventor
Michael GÖDIKER
Original Assignee
Vita Zahnfabrik H. Rauter Gmbh & Co. Kg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Vita Zahnfabrik H. Rauter Gmbh & Co. Kg filed Critical Vita Zahnfabrik H. Rauter Gmbh & Co. Kg
Publication of WO2020007744A1 publication Critical patent/WO2020007744A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
    • C03C10/0018—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents
    • C03C10/0027—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing SiO2, Al2O3 and monovalent metal oxide as main constituents containing SiO2, Al2O3, Li2O as main constituents
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition
    • C03C10/0009—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition containing silica as main constituent
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C4/00—Compositions for glass with special properties
    • C03C4/0007—Compositions for glass with special properties for biologically-compatible glass
    • C03C4/0021—Compositions for glass with special properties for biologically-compatible glass for dental use

Definitions

  • the present invention relates to a glass ceramic based on lithium silicate, which is characterized in that it is essentially free of potassium compounds, and a method for its production.
  • the invention relates to the use of the potassium-free glass ceramic for the production of dental restorations and a dental restoration which comprises the potassium-free glass ceramic.
  • lithium silicate glass ceramics in the field of dental restorations has long been known and is the focus of intensive research.
  • Glass ceramics based on lithium silicate are characterized by the fact that they pass through phases of different compositions of the crystal phases, which can be controlled by means of temperature input.
  • lithium metasilicate is usually present as the predominant crystal phase, which, due to its lower hardness and strength, allows better and more gentle processing.
  • a higher hardness / strength is advantageous for the final restoration in order to ensure a long service life and durability of the restoration.
  • This is achieved in that the processed lithium metasilicate glass ceramic is converted by heat treatment into a glass ceramic in which lithium disilicate forms a predominant crystal phase.
  • Lithium disilicate is characterized by an exceptional strength, which makes processing difficult but is desirable for the final restoration.
  • lithium silicate glass ceramics The mechanical properties of lithium silicate glass ceramics are known and the subject of various property rights.
  • EP 2 765 978 describes a lithium silicate glass ceramic which contains hexavalent metal oxides selected from Mo0 3 and W0 3 and is particularly suitable for use in dentistry, preferably for the production of dental restorations.
  • WO 2012/059143 relates to a glass ceramic based on the lithium metasilicate system Li 2 0 * Si0 2 (Li 2 Si0 3 ), which is simple in an intermediate stage of crystallization is mechanically workable and, after complete crystallization, is a high-strength, highly translucent and chemically stable glass ceramic.
  • WO 2011/076422 discloses a lithium disilicate glass ceramic which contains at least 10% by weight of a stabilizer for increasing the chemical and mechanical stability, the stabilizer being essentially in the amorphous phase.
  • EP 2 377 831 describes a lithium silicate glass ceramic which contains at least 6.1% by weight of ZrO 2 .
  • US 2015/0274581 relates to a glass ceramic which comprises 30 to 65% by weight of lithium disilicate as the first crystal phase and 20 to 60% by weight of ⁇ -spodumene as the second crystal phase.
  • the glass ceramics described in the prior art have the claim of improved machinability by means of ablative processes, the dental restoration being milled from a blank.
  • processing by means of the pressing process is available, for which, however, other requirements must be placed on the properties of the ceramic, in particular as regards the malleability of the ceramic blank.
  • glass ceramics based on lithium silicate which can also be processed into dental restorations by means of pressing processes.
  • Such glass ceramics are desirably suitable for both processing methods, both for the ablation processes, which can be summarized under the term CAD / CAM process, and for processing by means of pressing processes.
  • This task is solved by providing a lithium silicate glass ceramic that is essentially free of potassium. It was surprisingly found that the properties of the glass ceramic can be improved by the absence of potassium-containing compounds. In particular, the crystallization temperature and the softening temperature and thus the Machining temperature can be optimized for the respective application without the physical properties such as bending strength and
  • a first object of the present invention is a lithium silicate glass ceramic, obtainable from a melt which is produced by melting
  • Starting components are formed, the starting components Si0 2 , at least one lithium compound containing oxygen atoms selected from the group consisting of Li 2 0, Li 2 C0 3 , Li 2 S0 4 , LiN0 3 and LiCI0 4 ; Zr0 2 in an amount of 5 to 15 wt .-%, Al 2 0 3 , P 2 Os and at least one oxygen atom containing sodium compound selected from the group consisting of Na 2 0, Na 2 C0 3 , NaHC0 3 , Na 2 S0 and NaHS0 4 ; and 0.5 to 5 wt .-% Ce0 2 , and wherein the glass ceramic is characterized in that it is essentially free of potassium-containing compounds.
  • essentially free means that the proportion of potassium-containing compound in the glass ceramic is less than 0.1% by weight, in particular less than 0.09% by weight or less than 0.05% by weight. % and particularly preferably less than 0.01 wt .-%, based on the total weight of the melt.
  • the glass ceramic according to the invention is free of potassium-containing compounds.
  • Starting components in the sense of the present invention are to be understood as those components from which the melt for producing the glass ceramic is produced, the components being able to undergo chemical or physical conversion if the melt is formed.
  • the amount of SiO 2 is 50 to 70% by weight, preferably 53 to 65% by weight, based on the total weight of the starting components of the melt.
  • the ratio of SiO 2 to the lithium compound containing oxygen atoms is a decisive criterion for whether the desired crystal phases lithium metasilicate and lithium disilicate are formed.
  • An embodiment of the lithium silicate glass ceramic according to the invention is therefore preferred in which the proportion of the at least one Lithium compound containing oxygen atoms is 10 to 27% by weight, preferably 12 to 27% by weight, particularly preferably 13 to 22% by weight, in each case based on the total weight of the starting components of the melt.
  • silicate glass ceramics which are obtained from starting components whose proportion of oxygen-containing lithium compounds is in the claimed range, tend to form smaller crystals at an early stage, as a result of which the machinability is improved by means of ablation processes.
  • Zr0 2 can be added to the glass ceramic to improve the optical properties.
  • An embodiment is therefore preferred in which the content of ZrO 2 is 5 to 15% by weight, preferably 7 to 13% by weight or 9 to 11% by weight, particularly preferably 10 to 10.5% by weight , each based on the total weight of the starting components of the melt.
  • the proportion of Al 2 0 3 is preferably 0.1 to 5% by weight, particularly preferably 1 to 3.5% by weight, in each case based on the total weight of the
  • an embodiment of the glass ceramic according to the invention is preferred in which the proportion of P 2 Os is 2 to 10% by weight, preferably 4 to 8% by weight, in each case based on the total weight of the starting components of the melt.
  • the starting melt from which the glass ceramic according to the invention is formed contains at least one oxygen-containing sodium compound.
  • the content of the at least one oxygen-containing sodium compound is preferably in the range from 0.5 to 5% by weight, preferably 1 to 4% by weight, in each case based on the total weight of the starting components of the melt.
  • glass ceramics with a very good, balanced profile can be obtained from optical and mechanical properties if the melt is formed from starting components, in which the weight ratio of the starting components of Zr0 2 to oxygen-containing sodium compound, in particular of Zr0 2 to Na 2 0, in the range from 1: 1 to 30: 1, preferably from 2: 1 to 25: 1 and in particular from 3: 1 to 10 : 1 and in particular from 4: 1 to 7: 1.
  • glass ceramics according to the invention are advantageous in which the melt is formed from starting components, in which the weight ratio of the starting components of oxygen-containing lithium compound to oxygen-containing sodium compound, in particular of Li 2 0 to Na 2 0, in the range from 2: 1 to 54: 1, preferably from 3: 1 to 44: 1 and in particular from 5: 1 to 15: 1.
  • the melt is formed from starting components in which the total amount of oxygen-containing alkali metal compounds is 10.5 to 32% by weight, preferably 13 to 27% by weight and in particular 15 to 24% by weight.
  • the melt is formed from starting components which, as oxygen-containing alkali metal compounds, exclusively contain oxygen-containing lithium compounds, selected from the group consisting of Li 2 0, Li 2 C0 3 , Li 2 S0 4 , LiN0 3 and LiCl0 4 and mixtures thereof, and oxygen-containing sodium compounds, selected from the group consisting of Na 2 0, Na 2 C03, NaHC0 3 , Na 2 S0 4 and NaHS0 4, and mixtures thereof.
  • oxygen-containing alkali metal compounds exclusively contain oxygen-containing lithium compounds, selected from the group consisting of Li 2 0, Li 2 C0 3 , Li 2 S0 4 , LiN0 3 and LiCl0 4 and mixtures thereof
  • oxygen-containing sodium compounds selected from the group consisting of Na 2 0, Na 2 C03, NaHC0 3 , Na 2 S0 4 and NaHS0 4, and mixtures thereof.
  • An embodiment of the glass ceramic according to the invention is particularly preferred in which the starting components are present in the following amounts, the percentages by weight based in each case on the total weight of the starting components of the melt:
  • Si0 2 50 to 70 wt .-%, preferably 53 to 65 wt .-%;
  • Ce0 2 0.5 to 5 wt .-%, preferably 0.5 to 2.5 wt .-%, alternatively preferably 1 to 3.5 wt .-%; oxygen-containing lithium compound selected from the group consisting of Li 2 0, Li 2 C0 3 , Li 2 S0 4 , LiN0 3 and LiCl0 4 : 10 to 27% by weight, preferably 12 to 27% by weight, particularly preferably 13 to 22 wt .-%;
  • Zr0 2 5 to 15% by weight, preferably 7 to 13% by weight or 9 to 11% by weight, particularly preferably 10 to 10.5% by weight;
  • Al 2 0 3 0.1 to 5% by weight, preferably 1 to 3.5% by weight;
  • R 2 O d 2 to 10% by weight, preferably 4 to 8% by weight; and oxygen-containing sodium compound selected from the group consisting of Na 2 0, Na 2 CC> 3 , NaHCCh, Na 2 S0 4 and NaHS0 4 : 0.5 to 5% by weight, preferably 1 to 4% by weight.
  • the oxygen-containing lithium compound is Li 2 0 or Li 2 C0 3 .
  • the at least one oxygen-containing sodium compound is selected from the group consisting of Na 2 0, Na 2 C0 3 , Na 2 S0 4 and NaHC0 3 .
  • Ce0 2 is present as the starting component in the glass ceramic according to the invention.
  • the amount of Ce0 2 is 0.5 to 5 wt .-%, particularly preferably 0.5 to 2.5 wt .-%, alternatively preferably 1 to 3.5 wt .-%, each based on the total weight of the starting components the melt. It was surprisingly found that by using Ce0 2 as the starting component of the glass ceramic according to the invention, the melt produced from the starting components had significantly fewer air pockets.
  • the weight ratio of the starting components Zr0 2 to Ce0 2 is in the range from 10: 1 to 5: 1, preferably 7: 1 to 4: 1. It was surprisingly found that a weight ratio of the two starting components in the specified range an optimal balance between the optical properties of the later glass ceramic and the processability of the melt can be achieved. As already explained in the introductory part of the application, it has proven to be advantageous for the processing and formability of the glass ceramic if the glass ceramic comprises lithium metasilicate at least in the phase of its processing. An embodiment is therefore preferred in which the glass ceramic comprises lithium metasilicate (Li 2 Si0 3 ) as the crystal phase.
  • the proportion of lithium metasilicate is preferably in the range from 6 to 30% by weight, preferably 8 to 25% by weight, in each case based on the total weight of the glass ceramic.
  • the proportion of lithium metasilicate in the glass ceramic that lies within the claimed range, it was surprisingly found that the glass ceramic has the necessary strength for processing, but the processing can be carried out in a manner that is gentle on the tool, without causing chips on the blank or the one to be produced Restoration is coming.
  • a glass ceramic which comprises lithium metasilicate in the specified amounts can be processed by means of hot pressing without causing damage to the internal structure.
  • the glass ceramic used must have an appropriate strength. This is achieved, among other things, by converting the crystal phase of the softer lithium metasilicate into the crystal phase of the hard lithium disilicate. Accordingly, an embodiment of the glass ceramic according to the invention is preferred which comprises lithium disilicate (LhS Os).
  • the proportion of lithium disilicate in the glass ceramic is preferably in the range from 5 to 50% by weight, preferably 8 to 30% by weight. With a proportion of lithium disilicate in the specified range, the required strength of the dental restoration can be ensured, while the forces acting on the dental restoration can be absorbed at the same time.
  • the weight ratio of lithium metasilicate to lithium disilicate is 100: 1 to 1: 100, preferably 50: 1 to 1:50 and particularly preferably 2: 1 to 1: 2. It was surprisingly found that the mechanical properties of the glass ceramic according to the invention with a weight ratio of the two crystal phases in the specified Areas can be optimally adapted to the respective requirements, in particular machinability and strength.
  • the proportion of lithium disilicate in the glass ceramic according to the invention is less than 0.5% by weight, preferably less than 0.25% by weight and particularly preferably less than 0.1% by weight, in each case based on the total weight of the glass ceramic.
  • the proportion of lithium metasilicate in the glass ceramic according to the invention is less than 0.5% by weight, preferably less than 0.25% by weight and particularly preferably less than 0.1% by weight, in each case based on the total weight of the glass ceramic.
  • the glass ceramic according to the invention can have further crystal phases in addition to the crystal phases lithium metasilicate and lithium disilicate. These further crystal phases can be, for example, lithium phosphate (Li 3 P0 4 ), lithium aluminosilicate (LiAISi 2 0 6 ) and / or aluminum phosphate (AIP0 4 ).
  • the glass ceramic according to the invention is particularly suitable for processing by means of pressing processes.
  • An important parameter here is the softening temperature of the material, which indicates its heat resistance.
  • the softening temperature of the glass ceramic according to the invention is preferably in the range from 880 to 925 ° C., particularly preferably in the range from 890 to 910 ° C., determined by means of heating microscopy.
  • glass ceramics with a softening temperature in the specified range can be processed without problems using the pressing process and the CAD / CAM process.
  • the flexural strength is an important measure of the resilience of a dental restoration.
  • the glass ceramic according to the invention has a bending strength of 400 MPa or more, preferably 410 to 550 MPa, determined by means of a biaxial bending test in accordance with DIN EN ISO 6872. It has surprisingly been found that a bending strength in the named area of the glass ceramic has the necessary stability lends to counter the high mechanical stress and to maintain its shape stability over a long period of time, even under stress. High demands are placed in particular on the optical properties of a dental restoration. As far as possible, it should not be recognizable that it is a dental restoration and not a natural tooth.
  • the dental restoration must reproduce the natural color gradient of the teeth surrounding it, which, however, differs from individual to individual and tooth to tooth and is determined, for example, by living conditions and eating habits.
  • a measure to assess the optical properties of a dental restoration is the transmission of the glass ceramic on which it is based.
  • the glass ceramic according to the invention has a transmission of 25% to 60%, preferably 35 to 55%, in particular 40 to 50%, determined by means of transmission measurement (x-rite spectrophotometer). It has surprisingly been found that a glass ceramic with a transmission in the specified range mimics the appearance of a natural tooth without the pins or other fastening means of the glass ceramic showing through.
  • coloring substances can be added to the initial melt, which then determine the optical properties of the glass ceramic formed from the melt.
  • dyes and / or glass-coloring oxides are therefore used as additional starting components to form the melt.
  • Dyes and / or glass-coloring oxides are particularly preferably selected from the group consisting of oxides of yttrium, lanthanum, vanadium, terbium, titanium, manganese, magnesium, erbium, iron, copper, chromium, cobalt, nickel, selenium, silver, indium, gold and rare earth metals, and from these in particular neodymium, praseodymium, samarium and europium.
  • the present invention further provides a method for producing the glass ceramic according to the invention, which comprises the following steps: a) producing a glass from a melt which is formed by melting starting components, the starting components being selected from SiO 2 and at least one lithium compound containing oxygen atoms out the group consisting of Li 2 0, Li 2 C0 3 , Li 2 S0 4 , LiN0 3 and LiCI0 4 ; Zr0 2 in an amount of 5 to 15 wt.%, Al 2 0 3 , P 2 Os, 0.5 to 5 wt.% Ce0 2 and sodium compound containing at least one oxygen atom selected from the group consisting of Na 2 0, Na 2 C0 3, NaHC0 3, Na 2 S0 4 and NaHS0 include; b) a first heat treatment of the glass obtained in step a) to obtain a glass ceramic which has nuclei for the formation of lithium metasilicate; c) a second heat treatment of the glass ceramic from step b), while obtaining a glass ceramic which has an increased content of lithium metasilicate
  • the first and / or the second heat treatment can be carried out in two stages, wherein a nucleation step is carried out first and then a germ growth step is carried out subsequently.
  • the first heat treatment is preferably carried out in a temperature range from 550 to 600 ° C., preferably 570 to 590 ° C. It has surprisingly been found that this temperature range is particularly beneficial for the formation of lithium metasilicate seeds.
  • the second heat treatment is further preferably carried out at a temperature in the range from 600 to 660 ° C., preferably 620 to 650 ° C. Heat treatment in the specified temperature range promotes in particular the formation of the lithium metasilicate crystal phase.
  • a third heat treatment can be carried out after the second heat treatment, preferably in a temperature range from 820 to 860 ° C.
  • a heat treatment in the specified temperature range promotes in particular the formation of the lithium disilicate crystal phase.
  • the optical and mechanical properties of the glass ceramic can be further improved.
  • the method according to the invention can include further method steps.
  • between the first and the second heat treatment Processing step are carried out in which the glass ceramic obtained is shaped into a dental restoration, for example by means of pressing processes, CAD / CAM processes, casting or 3D printing.
  • Another object of the present invention is the use of the glass ceramic according to the invention as a dental material or as a component of a dental material.
  • the glass ceramic according to the invention is preferably used for the production of dental restorations.
  • Another object of the present invention is a shaped dental product comprising the glass ceramic according to the invention.
  • the dental product is preferably selected from the group consisting of crowns, partial crowns, inlays, onlays, veneers, implants and bridges.
  • the dental product according to the invention is preferably formed from the glass ceramic according to the invention by pressing and / or machining.
  • the pressing process is preferably a hot pressing process.
  • the machining is preferably carried out using a CAD / CAM method.
  • the following glass ceramics were produced, the starting components shown in Table 1 being used to form the melts.
  • the quantities given relate in each case to% by weight based on the total weight of the starting components.
  • Table 2 shows the process control, while Table 3 shows the temperatures for nucleation and crystal growth with the corresponding holding times.
  • Table 3 The time-temperature curve of the crystallization is shown in FIG. 1.
  • the glass ceramic according to the invention (Example 1), which is essentially free of potassium-containing compounds, had a softening temperature of 919 ° C., determined using a heating microscope.
  • the potassium-containing glass ceramic (cf. Example 1), which was used as a comparison, had a significantly higher softening temperature, also determined by means of a heating microscope, of 931 ° C. A bleeding rate of 10K / min was chosen for the measurements.
  • the glass ceramic according to the invention had a bending strength of 431 MPa, determined by means of a three-point bending test.
  • the transmission of the glass ceramic according to the invention was 46.5%, determined by means of transmission measurement (x-rite spectrophotometer).

Abstract

La présente invention concerne une vitrocéramique à base de silicate de lithium, qui se caractérise par le fait d'être sensiblement dépourvue de composés du potassium, ainsi qu'un procédé pour sa fabrication. L'invention concerne en outre l'utilisation de la vitrocéramique sans potassium pour fabriquer des restaurations dentaires, ainsi qu'une restauration dentaire qui comprend la vitrocéramique sans potassium.
PCT/EP2019/067405 2018-07-03 2019-06-28 Vitrocéramique sans potassium WO2020007744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EPPCT/EP2018/067948 2018-07-03
EP2018067948 2018-07-03

Publications (1)

Publication Number Publication Date
WO2020007744A1 true WO2020007744A1 (fr) 2020-01-09

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PCT/EP2019/067405 WO2020007744A1 (fr) 2018-07-03 2019-06-28 Vitrocéramique sans potassium

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WO (1) WO2020007744A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076422A1 (fr) 2009-12-23 2011-06-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vitrocéramique renfermant du disilicate de lithium, son procédé de production et son utilisation
EP2377831A1 (fr) 2010-04-16 2011-10-19 Ivoclar Vivadent AG Vitrocéramique et verre à base du silicate de lithium ayant une teneur en ZrO2
WO2012059143A1 (fr) 2010-11-02 2012-05-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verres ou vitrocéramiques à base de silicate de lithium, leur procédé de fabrication et leur utilisation
EP2765978A2 (fr) 2011-10-14 2014-08-20 Ivoclar Vivadent AG Vitrocéramique et verre en silicate de lithium, ayant un oxyde métallique hexavalent
US20150274581A1 (en) 2013-09-06 2015-10-01 Corning Incorporated High strength glass-ceramics having lithium disilicate and beta-spodumene structures
WO2017067909A1 (fr) * 2015-10-19 2017-04-27 Vita Zahnfabrik H. Rauter Gmbh & Co. Kg Procédé pour fabriquer une pièce à usiner à faible translucidité

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011076422A1 (fr) 2009-12-23 2011-06-30 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vitrocéramique renfermant du disilicate de lithium, son procédé de production et son utilisation
EP2377831A1 (fr) 2010-04-16 2011-10-19 Ivoclar Vivadent AG Vitrocéramique et verre à base du silicate de lithium ayant une teneur en ZrO2
WO2012059143A1 (fr) 2010-11-02 2012-05-10 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verres ou vitrocéramiques à base de silicate de lithium, leur procédé de fabrication et leur utilisation
EP2765978A2 (fr) 2011-10-14 2014-08-20 Ivoclar Vivadent AG Vitrocéramique et verre en silicate de lithium, ayant un oxyde métallique hexavalent
US20150274581A1 (en) 2013-09-06 2015-10-01 Corning Incorporated High strength glass-ceramics having lithium disilicate and beta-spodumene structures
WO2017067909A1 (fr) * 2015-10-19 2017-04-27 Vita Zahnfabrik H. Rauter Gmbh & Co. Kg Procédé pour fabriquer une pièce à usiner à faible translucidité

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