WO2013053863A2 - Lithiumsilikat-glaskeramik und -glas mit einwertigem metalloxid - Google Patents
Lithiumsilikat-glaskeramik und -glas mit einwertigem metalloxid Download PDFInfo
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- 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
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B32/00—Thermal after-treatment of glass products not provided for in groups C03B19/00, C03B25/00 - C03B31/00 or C03B37/00, e.g. crystallisation, eliminating gas inclusions or other impurities; Hot-pressing vitrified, non-porous, shaped glass products
- C03B32/02—Thermal crystallisation, e.g. for crystallising glass bodies into glass-ceramic articles
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- 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
-
- 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
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- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
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- 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
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
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- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K6/00—Preparations for dentistry
- A61K6/80—Preparations for artificial teeth, for filling teeth or for capping teeth
- A61K6/831—Preparations for artificial teeth, for filling teeth or for capping teeth comprising non-metallic elements or compounds thereof, e.g. carbon
-
- 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
- C03C2214/00—Nature of the non-vitreous component
- C03C2214/20—Glass-ceramics matrix
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- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
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- 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
- Lithium silicate glass-ceramic and glass with monovalent metal oxide Lithium silicate glass-ceramic and glass with monovalent metal oxide
- the invention relates to lithium silicate glass-ceramic and glass which contain monovalent metal oxide selected from Rb 2 ⁇ 0, CS 2 O and mixtures thereof and are particularly suitable for use in dentistry, preferably for the production of dental restorations.
- Lithium silicate glass ceramics are generally characterized by very good mechanical properties, which is why they have long been used in the dental field and there primarily for the production of dental crowns and small bridges application.
- the known lithium silicate glass ceramics usually contain as main components S1O 2 , Li 2 O, Al 2 O 3 , Na 2 ⁇ 0 or K 2 O, and nucleating agents such as P 2 O 5 .
- EP 1 505 041 describes lithium silicate glass ceramics containing K 2 O and Al 2O 3 , which can be processed very well in the presence of lithium metasilicate as main crystal phase mechanically, for example by means of CAD / CAM processes, and then by further heat treatment at temperatures of 830 up to 850 ° C in high-strength lithium disilicate glass ceramics.
- EP 1688398 describes similar K 2 O and Al 2 0 3 -containing lithium silicate glass-ceramics are also substantially free of ZnO.
- a heat treatment at 830 to 880 ° C is applied to them.
- No. 5,507,981 describes methods for producing dental restorations and glass ceramics which can be used in these methods. It is in particular lithium disilicate glass ceramics containing Al 2O 3 and regularly either Na 2 ⁇ 0 or K 2 O.
- US Pat. No. 6,455,451 relates to lithium disilicate glass ceramics which, in specific embodiments, can evidently also have CS 2O. However, in these embodiments, too, the presence of significant amounts of Al 2 O 3 and BaO required. The production of the desired lithium disilicate crystal phase requires high temperatures of 800 to 1000 ° C.
- WO 2008/106958 discloses lithium disilicate glass ceramics for veneering zirconium oxide ceramics.
- the glass ceramics contain Na 2 ⁇ 0 and are produced by heat treatment of nucleated glasses at 800 to 940 ° C.
- WO 2009/126317 describes Ge0 2 ⁇ containing lithium metasilicate glass ceramics, which also have K 2 O and Al 2 O 3 .
- the glass-ceramics are mainly processed by machining into dental products.
- WO 2011/076422 relates to lithium disilicate glass ceramics which, in addition to high contents of ZrO 2 or HfO 2, also have K 2 O and Al 2 O 3 .
- the crystallization of lithium disilicate takes place at temperatures of 800 to 1040 ° C.
- the known lithium disilicate glass-ceramics have in common that they require heat treatments at more than 800 ° C. in order to effect the precipitation of lithium disilicate as the main crystal phase. Therefore, a high amount of energy for their production is necessary. Further, with the known glass-ceramics on a regular basis the alkali metal oxides K 2 O or a 2 0 and Al 2 O 3, and BaO as the essential components are present, the main crystal phase are apparently necessary to produce the glass-ceramics and in particular the formation of the desired lithium disilicate. There is therefore a need for lithium silicate glass-ceramics, in the production of which the crystallization of lithium disilicate can be caused at lower temperatures. Next they should without the previously considered necessary in the alkali metal oxides K 2 O or a 2 0 and Al 2 O 3 and BaO be produced and due mainly to their optical and mechanical properties are particularly suitable for the production of dental restorations.
- the invention also provides the starting glass according to claim 16 or 18, the lithium silicate glass with germs according to claim 17 and 18, the process for producing the glass ceramic and the lithium silicate glass with germs according to claims 19 and 20 and the use according to claims 21 and 22.
- the lithium silicate glass-ceramic according to the invention is characterized in that it contains monovalent metal oxide selected from Rb 2 ⁇ O, CS 2 O and mixtures thereof.
- the glass-ceramic contains the monovalent metal oxide or mixtures thereof in an amount of 0.1 to 17.0, in particular 1.0 to 15.0 and particularly preferably 1.5 to 8.0 wt .-%.
- the formation of the glass ceramic according to the invention with lithium disilicate as the main crystal phase succeeds even in the absence of various components considered necessary for conventional glass ceramics, such as, in particular, K 2 O, Na 2 O and Al 2 O 3 and BaO, and this even at very low levels advantageous crystallization temperatures of about 700 ° C.
- the glass-ceramic according to the invention accordingly preferably contains less than 1.0, in particular less than 0.5, preferably less than 0.1,% by weight of K 2 O. Most preferably, it is essentially free of K 2 O.
- a glass-ceramic which contains K 2 O, Na 2 O and mixtures thereof in an amount of less than 1.0, in particular less than 0.5 and preferably less than 0.1% by weight. % and most preferably is substantially free of K 2 0 and Na 2 0.
- a glass ceramic which contains less than 5.3, in particular less than 5.1, preferably less than 4.0 and very particularly preferably less than 3.0% by weight of Al 2 O 3 .
- the glass ceramic is essentially free of Al 2 O 3 .
- the molar ratio of monovalent metal oxide to Al 2 O 3 is at least 0.5 and in particular 0.5 to 1.5.
- the glass ceramic contains less than 3.8, in particular less than 3.6, and preferably less than 2.5 wt .-% BaO. Most preferably, it is essentially free of BaO.
- a glass-ceramic in which lithium silicate glass-ceramic is excluded which contains at least 6.1% by weight ZrO 2 .
- a glass-ceramic in which lithium silicate glass-ceramic is excluded which contains at least 8.5% by weight of transition metal oxide selected from the group consisting of oxides of yttrium, oxides of transition metals of atomic number 41-79 and mixtures of these oxides.
- the glass ceramic according to the invention preferably contains 55.0 to 85, 0, in particular 60.0 to 78.0 and preferably 62.0 to 77.0 wt .-% Si0 second
- the glass ceramic contains 9.0 to 20.0, in particular 9.0 to 17.0 and particularly preferably 12.0 to 16.0 wt .-% Li 2 0. It is further preferred that the molar ratio between Si0 2 and Li 2 0 is between 2.2 to 2.6, in particular 2.3 to 2.5 and particularly preferably about 2.4.
- the glass-ceramic according to the invention may also contain a nucleating agent.
- a nucleating agent is present.
- P 2 O 5 is used.
- the glass-ceramic contains 0 to 12.0, in particular 1.0 to 12.0, preferably 2.0 to 9.0 and particularly preferably 2.5 to 7.5 wt .-% P 2 0 5 .
- the glass ceramic contains at least one and preferably all the following components:
- the glass ceramic according to the invention may additionally contain additional components which are selected, in particular, from oxides of divalent elements, oxides of trivalent elements, further oxides of tetravalent elements, further oxides of pentavalent elements, oxides of hexavalent elements, melt accelerators, colorants and fluorescers.
- Particularly suitable oxides of divalent elements are the alkaline earth metal oxides, preferably CaO, BaO, MgO, SrO or a mixture thereof and preferably MgO.
- Suitable oxides of trivalent elements are in particular Y 2 O 3 , La 2 O 3 , Bi 2 O 3 and mixtures thereof, and preferably Y 2 O 3 .
- pentavalent elements refers to oxides of pentavalent elements except P 2 O 5.
- suitable further oxides of pentavalent elements are a 2 0s or M 2 O 5 .
- hexavalent element oxides examples include WO 3 and M0O3.
- a glass ceramic which contains at least one oxide of divalent elements, at least one trivalent element oxide, at least one further oxide of tetravalent elements, at least one further oxide of pentavalent elements and / or at least one oxide of hexavalent elements.
- melt accelerators are fluorides.
- colorants and fluorescers are oxides of d and f elements, e.g. the oxides of Ti, V, Sc, Mn, Fe, Co, Ta, W, Ce, Pr, Nd, Tb, Er, Dy, Gd, Eu and Yb.
- metal colloids e.g. of Ag, Au and Pd, which can also act as nucleating agents. These metal colloids may e.g. by reduction of corresponding oxides, chlorides or nitrates during the melting and crystallization processes.
- the metal colloids are preferably contained in an amount of 0.005 to 0.5 wt .-% in the glass ceramic.
- the glass-ceramic Ag 2 0 in an amount of 0.005 to 0.5 wt .-%.
- the term "main crystal phase" used below refers to the crystal phase, which has the highest volume fraction compared to other crystal phases .
- the glass ceramic according to the invention has lithium metasilicate as main crystal phase.
- the glass ceramic contains more than 5% by volume, preferably more than 10% by volume and particularly preferably more than 15% by volume of lithium metasilicate crystals, based on the total glass ceramic.
- the glass ceramic has lithium disilicate as the main crystal phase.
- the glass ceramic contains more than 10% by volume, preferably more than 20% by volume and particularly preferably more than 30% by volume, of lithium disilicate crystals, based on the total glass ceramic.
- the lithium disilicate glass-ceramic according to the invention is distinguished by particularly good mechanical properties and it can be used, for example, in be produced by heat treatment of the lithium metasilicate glass ceramic according to the invention. But it can be formed in particular by heat treatment of a corresponding starting glass or a corresponding lithium silicate glass with germs.
- the lithium disilicate glass ceramic according to the invention has very good mechanical and optical properties, even if there are no essential components in conventional glass ceramics. The combination of their properties even makes it possible to use them as dental material and in particular material for the production of dental restorations.
- the lithium disilicate glass ceramic according to the invention has in particular a fracture toughness, measured as Ki C value, of at least about 2.0 MPa » m 0'5 and in particular at least about 2.3 MPa » m 0'5 .
- This value was determined using the Vicker's method and calculated using the Niihara equation. Further, it has a high biaxial breaking strength of preferably 400 to 700 MPa. Moreover, it shows a high chemical resistance, which was determined by mass loss after storage in acetic acid. The chemical resistance is in particular less than 100 yg / cm 2 . Biaxial fracture strength and chemical resistance were determined according to ISO 6872 (2008).
- the invention likewise relates to a lithium silicate glass having nuclei which are suitable for the formation of lithium metasilicate and / or lithium disilicate crystals, wherein the glass contains the components of the glass compositions according to the invention described above.
- this glass contains monovalent metal oxide selected from POO 2 O, CS 2 O and mixtures thereof.
- the glass of the invention with germs can be produced by Heat Treatment ⁇ development of a corresponding composite output glass of the invention.
- a further politiciansbe ⁇ action of the inventive lithium metasilicate glass ceramic can then be formed, which in turn can be converted by further heat treatment in the inventive lithium disilicate glass ceramic, or it may also, preferably directly, the inventive lithium disilicate glass-ceramic formed from the glass with germs.
- the starting glass, the glass with nuclei and the lithium metasilicate glass-ceramic can be regarded as precursors for producing the high-strength lithium disilicate glass-ceramic.
- the glass ceramics according to the invention and the glasses according to the invention are in particular in the form of powders, granules or blanks, for example monolithic blanks, such as platelets, Ashlars or cylinders, or powder compacts, in unsintered, partially sintered or densely sintered form. In these forms they can be easily processed. But they can also be in the form of dental restorations, such as inlays, onlays, crowns, veneers, shells or abutments.
- the invention likewise relates to a method for producing the glass ceramic according to the invention and to the glass according to the invention with nuclei, in which a correspondingly composed starting glass, the glass according to the invention having nuclei or the lithium metasilicate glass ceramic according to the invention has at least one heat treatment in the range from 450 to 950 ° C., in particular 450 to 800 and preferably 450 to 750 ° C is subjected.
- the starting glass according to the invention therefore contains monovalent metal oxide selected from Rb 2 ⁇ 0, CS 2 O and mixtures thereof. In addition, it preferably also contains suitable amounts of S1O 2 and L1 2 O in order to allow the formation of a lithium silicate glass ceramic and in particular a lithium disilicate glass ceramic. Furthermore, the starting glass may also contain other components, as indicated above for the lithium silicate glass ceramic according to the invention. All such embodiments are preferred for the starting glass, which are also given preference for the glass ceramic according to the invention.
- the production of the glass with germs is usually carried out by means of a heat treatment of the starting glass at a temperature of in particular 480 to 560 ° C.
- a heat treatment of the starting glass at a temperature of in particular 480 to 560 ° C.
- Lithium disilicate glass ceramic produced.
- significantly lower temperatures are used according to the invention for the crystallization of lithium disilicate as in the conventional lithium disilicate glass-ceramics.
- the resulting energy saved represents a significant advantage.
- these low crystallization temperature Tempe ⁇ also possible if deemed substantial conventional glass ceramics components such as K 2 O and Al 2 O 3 and BaO missing.
- the starting glass is prepared by mixing a mixture of suitable starting materials, e.g. Carbonates, oxides, phosphates and fluorides, is melted at temperatures of in particular 1300 to 1600 ° C for 2 to 10 h.
- suitable starting materials e.g. Carbonates, oxides, phosphates and fluorides
- the glass melt obtained is poured into water to form a glass granulate, and the granules obtained are then remelted.
- the melt can then be poured into molds to produce blanks of the starting glass, so-called solid glass blanks or mono ⁇ lithic blanks.
- this granulate can then be pressed into a blank, a so-called powder compact.
- the starting glass can also be processed into a powder after granulation.
- the starting glass for example in the form of a solid glass blank, a powder compact or in the form of a powder, subjected to at least one heat treatment in the range of 450 to 950 ° C. It is preferred that first at a temperature in the range of 480 to 560 ° C, a first heat treatment is carried out to produce a glass according to the invention with nuclei, which is used to form lithium metal. silicate and / or lithium disilicate crystals are suitable. This first heat treatment is preferably carried out for a period of 10 minutes to 120 minutes and in particular 10 minutes to 30 minutes.
- the glass with seeds may then preferably be subjected to at least one further temperature treatment at a higher temperature, and in particular more than 570 ° C., to effect crystallization of lithium metasilicate or of lithium disilicate.
- This further heat treatment is preferably carried out for a period of 10 minutes to 120 minutes, in particular 10 minutes to 60 minutes and particularly preferably 10 minutes to 30 minutes.
- the further heat treatment is usually carried out at 600 to 750, preferably 650 to 750 and most preferably 700 to 750 ° C. In a preferred embodiment of the method is therefore
- the starting glass is subjected to a heat treatment at a temperature of 480 to 560 ° C to form the glass with seeds, and
- the duration of the heat treatments carried out in (a) and (b) is preferably as stated above.
- the method according to the invention carried out at least one heat treatment can also be part of a hot-pressing or supervisor sintering of the glass according to the invention or the erfindungsge ⁇ MAESSEN glass ceramic.
- dental restorations such as bridges, inlays, onlays, crowns, veneers, shells or abutments, getting produced.
- the invention therefore also relates to the use thereof for the production of dental restorations. It is preferred that the glass ceramic or the glass is deformed by pressing or machining to the desired dental restoration.
- the compression is usually carried out under elevated pressure and elevated temperature. It is preferred that the pressing takes place at a temperature of 700 to 1200 ° C. Further, it is preferable to perform the pressing at a pressure of 2 to 10 bar. During pressing, the desired change in shape is achieved by viscous flow of the material used.
- the starting glass according to the invention and in particular the glass according to the invention with germs, the lithium metasilicate according to the invention and the lithium disilicate glass ceramic according to the invention can be used.
- the glasses and glass ceramics according to the invention in particular in the form of blanks, e.g. Solid blanks or powder compacts, e.g. in unsintered, partially sintered or densely sintered form.
- the machining is usually carried out by material-removing methods and in particular by milling and / or grinding. It is particularly preferred that the machining is carried out within the framework of a CAD / CAM method.
- the starting glass according to the invention, the glass according to the invention with germs, the lithium metasilicate according to the invention and the lithium disilicate glass ceramic according to the invention can be used.
- the glasses and glass ceramics according to the invention can be used in particular in the form of blanks, for example solid blanks or powder compacts, for example in unsintered, partially sintered or densely sintered form.
- the inventive lithium metasilicate and lithium disilicate glass ceramic is preferably used.
- the lithium disilicate glass ceramic can also be used in a not yet fully crystallized form, which was produced by heat treatment at a lower temperature. This offers the advantage that easier machining and thus the use of simpler machines for machining is possible. After machining such a partially crystallized material, it is regularly subjected to a heat treatment at a higher temperature, and more preferably 650 to 750 ° C, and preferably about 700 ° C, to cause further crystallization of lithium disilicate.
- the desired shaped dental restoration by pressing or machining after the production of the desired shaped dental restoration by pressing or machining, it can in particular be heat-treated in order to convert used precursors, such as starting glass, glass with germs or lithium metasilicate glass ceramic, into lithium disilicate glass ceramic or to increase the crystallization of lithium disilicate or the porosity, eg a porous powder compact used, to reduce.
- used precursors such as starting glass, glass with germs or lithium metasilicate glass ceramic
- the glass-ceramic according to the invention and the glass according to the invention are also suitable as coating material of e.g. Ceramics and glass ceramics.
- the invention is therefore likewise directed to the use of the glass according to the invention or of the glass ceramic according to the invention for coating in particular ceramics and glass ceramics.
- the invention also relates to a process for the coating of
- the glass ceramic or the glass is applied in a customary manner, for example as a powder, to the material to be coated, such as ceramic or glass ceramic. and then sintered at elevated temperature.
- the glass ceramic according to the invention or the glass according to the invention for example in the form of powder compacts or monolithic blanks, at an elevated temperature, for example 700 to 1200 ° C, and using pressure, for example 2 to 10 bar, pressed ,
- a suitable furnace is eg the Programat EP 5000 from Ivoclar Vivadent AG, Liechtenstein.
- the glass ceramic according to the invention with lithium disilicate is present as the main crystal phase, since it has particularly good properties.
- the invention therefore also relates to the use of the glass ceramic according to the invention or the glass according to the invention as dental material and in particular for the production of dental restorations or as a coating material for dental restorations, such as crowns, bridges and abutments.
- the glasses and glass ceramics according to the invention can also be mixed together with other glasses and glass ceramics to give dental materials with desired properties. Therefore, compositions and in particular dental materials which comprise the glass or the glass ceramic according to the invention in combination with at least one other glass and / or another glass ceramic constitute a further subject of the invention.
- the glass according to the invention or the glass ceramic according to the invention can therefore be used in particular as the main component of a inorganic-inorganic composites or in combination with a variety of other glasses and / or glass-ceramics are used, wherein the composites or combinations can be used in particular as dental materials. Particularly preferably, the combinations or composites may be in the form of sintered blanks.
- glasses and glass ceramics for producing inorganic-inorganic composites and combinations are described in DE 43 14 817, DE 44 23 793, DE 44 23 794, DE 44 28 839, DE 196 47 739, DE 197 25 553, DE 197 25 555 DE 100 31 431 and DE 10 2007 011 337. These glasses and glass ceramics belong to the silicate, borate, phosphate or aluminosilicate group.
- Preferred glasses and glass ceramics are of Si0 2 -Al 2 0 3 -K 2 0-yp (with cubic or tetragonal leucite crystals), Si0 2 -B 2 0 3 - a 2 0-yp, alkali silicate type, alkali Zinc-silicate type, silico-phosphate type, Si0 2 -Zr0 2 type and / or lithium alumino-silicate type (with spodumene crystals).
- the thermal expansion coefficient in a wide range of 6 to 20 ⁇ 10 "6 K " 1 desired manner can be set.
- the starting glasses were first melted in 100 to 200 g scale from conventional raw materials at 1400 to 1500 ° C, the melting was very well possible without the formation of bubbles or streaks.
- Glass frits were prepared by pouring the starting glasses into water, which were then melted a second time at 1450 to 1550 ° C for 1 to 3 hours for homogenization.
- Example 10 the obtained glass melt was cooled to 1400 ° C and converted into a finely divided granule by pouring into water.
- the granules were dried and ground to a powder with a particle size of ⁇ 90 ym. This powder was moistened with a little water and pressed at a pressure of 20 MPa to a powder compact.
- the glass monoliths (Examples 1-9 and 11-16) and the powder compact (Example 10) were then converted by thermal treatment into glasses and glass ceramics according to the invention.
- the thermal treatments used for controlled nucleation and controlled crystallization are also given in Table I.
- the biaxial strength o B was at least 480 MPa high. It was determined according to Dental Standard ISO 6872 (2008) on test specimens produced by machining the respective lithium disilicate glass ceramic. A CEREC InLab machine (Sirona, Bensheim) was used for processing. The lithium disilicate and lithium metasilicate glass ceramics produced could be machined very well in a CAD / CAM process or by hot pressing in the form of various dental restorations, which were provided with a veneer if required. Also, they could be applied by hot pressing as coatings on particular dental restorations, for example, to blind them in the desired manner.
- a glass having the composition according to Examples 6 and 7 was prepared by mixing corresponding raw materials in the form of oxides and carbonates for 30 minutes in a Turbola mixer and then melting at 1450 ° C. for 120 minutes in a platinum crucible. The melt was poured into water to obtain finely divided glass granules. This glass granulate was again melted at 1530 ° C for 150 minutes to obtain a glass melt having a particularly high homogeneity. The temperature was lowered to 1500 ° C for 30 minutes and then cylindrical glass blanks 12.5 mm in diameter were poured into preheated, divisible steel molds or graphite molds. Thereafter, the obtained glass cylinders were nucleated and relaxed in the range of 480-560 ° C depending on the composition.
- the nucleated glass cylinders were then processed to dental restorations such as inlays, onlays, veneers, partial crowns, crowns, laminates and laminates by hot pressing at a press temperature of 900-1100 ° C using an EP600 press oven, Ivoclar Vivadent AG. In each case lithium disilicate could be detected as the main crystal phase.
- dental restorations such as inlays, onlays, veneers, partial crowns, crowns, laminates and laminates by hot pressing at a press temperature of 900-1100 ° C using an EP600 press oven, Ivoclar Vivadent AG.
- lithium disilicate could be detected as the main crystal phase.
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Abstract
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Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MX2014004514A MX350427B (es) | 2011-10-14 | 2012-10-11 | Ceramico de vidrio de silicato de litio y vidrio con oxido de metal monovalente. |
CA2851386A CA2851386C (en) | 2011-10-14 | 2012-10-11 | Lithium silicate glass ceramic and glass with monovalent metal oxide |
PL12772325T PL2765977T3 (pl) | 2011-10-14 | 2012-10-11 | Litowokrzemianowa ceramika szklana i szkło z tlenkiem jednowartościowego metalu |
RU2014119361A RU2606999C2 (ru) | 2011-10-14 | 2012-10-11 | Литиево-силикатные стеклокерамика и стекло с оксидом одновалентного металла |
JP2014535089A JP6633278B2 (ja) | 2011-10-14 | 2012-10-11 | 一価の金属酸化物を含むケイ酸リチウムガラスセラミックおよびガラス |
DE112012004261.1T DE112012004261A5 (de) | 2011-10-14 | 2012-10-11 | Lithiumsilikat-Glaskeramik und -Glas mit einwertigem Metalloxid |
CN201280049650.4A CN103930086B (zh) | 2011-10-14 | 2012-10-11 | 包含一价金属氧化物的硅酸锂玻璃陶瓷和硅酸锂玻璃 |
DK12772325.2T DK2765977T3 (en) | 2011-10-14 | 2012-10-11 | Lithium silicate glass-ceramic and glass WITH MONOVALENT metal oxide |
ES12772325.2T ES2562338T3 (es) | 2011-10-14 | 2012-10-11 | Vitrocerámica y vidrio de silicato de litio con óxido metálico monovalente |
BR112014008581A BR112014008581A2 (pt) | 2011-10-14 | 2012-10-11 | vitrocerâmica e vidro de silicato de lítio com óxido de metal monovalente |
US14/001,180 US9101439B2 (en) | 2011-10-14 | 2012-10-11 | Lithium silicate glass ceramic and lithium silicate glass comprising a monovalent metal oxide |
EP12772325.2A EP2765977B1 (de) | 2011-10-14 | 2012-10-11 | Lithiumsilikat-glaskeramik und -glas mit einwertigem metalloxid |
KR1020147012070A KR101628587B1 (ko) | 2011-10-14 | 2012-10-11 | 1가 금속 산화물을 포함하는 리튬 실리케이트 유리 세라믹 및 리튬 실리케이트 유리 |
US14/751,770 US9878939B2 (en) | 2011-10-14 | 2015-06-26 | Lithium silicate glass ceramic and glass with monovalent metal oxide |
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EP11185334 | 2011-10-14 | ||
EP11185334.7 | 2011-10-14 |
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US14/001,180 A-371-Of-International US9101439B2 (en) | 2011-10-14 | 2012-10-11 | Lithium silicate glass ceramic and lithium silicate glass comprising a monovalent metal oxide |
US14/751,770 Continuation US9878939B2 (en) | 2011-10-14 | 2015-06-26 | Lithium silicate glass ceramic and glass with monovalent metal oxide |
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WO2013053863A2 true WO2013053863A2 (de) | 2013-04-18 |
WO2013053863A8 WO2013053863A8 (de) | 2013-06-20 |
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PCT/EP2012/070219 WO2013053863A2 (de) | 2011-10-14 | 2012-10-11 | Lithiumsilikat-glaskeramik und -glas mit einwertigem metalloxid |
Country Status (15)
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US (2) | US9101439B2 (de) |
EP (1) | EP2765977B1 (de) |
JP (2) | JP6633278B2 (de) |
KR (1) | KR101628587B1 (de) |
CN (1) | CN103930086B (de) |
CA (1) | CA2851386C (de) |
DE (1) | DE112012004261A5 (de) |
DK (1) | DK2765977T3 (de) |
ES (1) | ES2562338T3 (de) |
HU (1) | HUE027869T2 (de) |
MX (1) | MX350427B (de) |
PL (1) | PL2765977T3 (de) |
PT (1) | PT2765977E (de) |
RU (1) | RU2606999C2 (de) |
WO (1) | WO2013053863A2 (de) |
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EP2788297A1 (de) | 2011-12-08 | 2014-10-15 | 3M Innovative Properties Company | Lithiumsilikat-glaskeramikmaterial, verfahren zu seiner herstellung und verwendung |
EP2792649B1 (de) * | 2013-04-15 | 2019-11-27 | Ivoclar Vivadent AG | Lithiumsilikat-Glaskeramik und -Glas mit Gehalt an Rubidiumoxid |
WO2014170170A2 (de) * | 2013-04-15 | 2014-10-23 | Ivoclar Vivadent Ag | Lithiumsilikat-glaskeramik und -glas mit gehalt an cäsiumoxid |
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US10405953B2 (en) | 2014-08-27 | 2019-09-10 | Gc Corporation | Method for producing dental prosthesis, method for producing lithium disilicate blank for dental prosthesis and lithium disilicate blank for dental prosthesis |
US11166795B2 (en) | 2014-08-27 | 2021-11-09 | Gc Corporation | Method for producing dental prosthesis, method for producing lithium disilicate blank for dental prosthesis and lithium disilicate blank for dental prosthesis |
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EP3696149A1 (de) | 2019-02-14 | 2020-08-19 | Ivoclar Vivadent AG | Fluoreszierende glaskeramiken und gläser mit gehalt an cer und zinn |
EP3696150A1 (de) | 2019-02-14 | 2020-08-19 | Ivoclar Vivadent AG | Fluoreszierende glaskeramiken und gläser mit gehalt an europium |
Also Published As
Publication number | Publication date |
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WO2013053863A8 (de) | 2013-06-20 |
US9101439B2 (en) | 2015-08-11 |
ES2562338T3 (es) | 2016-03-03 |
DE112012004261A5 (de) | 2014-08-28 |
CN103930086A (zh) | 2014-07-16 |
CN103930086B (zh) | 2017-09-15 |
JP2017214287A (ja) | 2017-12-07 |
MX2014004514A (es) | 2014-05-28 |
CA2851386C (en) | 2017-07-11 |
PL2765977T3 (pl) | 2016-06-30 |
KR101628587B1 (ko) | 2016-06-08 |
PT2765977E (pt) | 2016-03-29 |
EP2765977B1 (de) | 2015-12-30 |
WO2013053863A3 (de) | 2013-08-01 |
HUE027869T2 (en) | 2016-11-28 |
US20140135202A1 (en) | 2014-05-15 |
RU2014119361A (ru) | 2015-11-20 |
EP2765977A2 (de) | 2014-08-20 |
US20150299031A1 (en) | 2015-10-22 |
CA2851386A1 (en) | 2013-04-18 |
KR20140075776A (ko) | 2014-06-19 |
RU2606999C2 (ru) | 2017-01-10 |
JP2015505786A (ja) | 2015-02-26 |
DK2765977T3 (en) | 2016-03-07 |
JP6633278B2 (ja) | 2020-01-22 |
MX350427B (es) | 2017-09-05 |
US9878939B2 (en) | 2018-01-30 |
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