Vita Zahnfabrik H. Rauter Gmbh Co. Kg

Degudent Gmbh

Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Dentsply Sirona Inc.

Dentsply International Inc.

Degundent Gmbh

Markus Vollmann

Udo Schusser

Norbert Thiel

Bernhard Durschang

Jörn Probst

Joachim Bibus

Carsten Wiesner

Stefan Fecher

Michael Gödiker

Lothar Volkl

Michael Godiker

Joern Probst

Michael Hackner

Martin Kutzner

Lothar Völkl

Irmgard Wissel

Lothar Voelkl

Marcel Meegdes

Rudi Steinke

Peter Kreuder

Marc Stephan

Andreas Gebhardt

Elmar Hock

Heiner Horhold

Michael Pröpster

Heiner Hörhold

Jörg Hachenberg

Gerhard Zellmann

Jorn Probst

Wolfgang Lehnhoff

Carsten Weisner

Michael Proepster

Michael GÖDIKER

Michael Goediker

The invention relates to a method for the production of a blank of a ceramic material, wherein a first ceramic material and then a second ceramic material of different compositions are filled into a mold and wherein the materials are pressed and after pressing are sintered. Thereby, a layer of the first ceramic material is filled into the mold, a first open cavity is formed in the layer, the second ceramic material is filled into the first open cavity and the materials are pressed together and are then heat-treated. Both the first ceramic material and the second ceramic material contain, or consists of, lithium silicate glass ceramic.

Method for the production of a blank, blank and a dental restoration

The invention relates to a method to produce a dental structure with a cavity having a negative form of the structure, which is formed in an investment material, wherein flowable lithium silicate glass ceramic is pressed into the cavity. Thereby a compressive surface stress is created in the ceramic structure through the replacement of lithium ions by alkali ions, in that the model is enriched with alkali compounds and/or the model is covered with a layer of a material containing alkali ions.

Method to produce a dental structure and dental structure

The invention relates to a lithium silicate glass ceramic, which contains at least lithium disilicate as a crystal phase, and lithium aluminum silicate as further crystal phase. The lithium silicate glass ceramic in its initial composition contains AlOat 1.5 to 3.5 percent by weight, and KO at 0.6 to 1.8 percent by weight.

Lithium silicate glass ceramic

The invention relates to glass-ceramics based on the lithium silicate system which can be mechanically machined easily in an intermediate step of crystallisation and, after complete crystallisation, represent a very strong, highly-translucent and chemically-stable glass-ceramic. Likewise, the invention relates to a method for the production of these glass-ceramics. The glass-ceramics according to the invention are used as dental material.

Lithium disilicate glass-ceramic, method for production thereof and use thereof

The invention relates to a method to produce a medical form body of lithium silicate glass ceramic. To increase its strength it is proposed that a surface compressive stress is created in a form body of lithium silicate glass, or containing lithium silicate glass, through the replacement of lithium ions by alkali metal ions of greater diameter. For this purpose the form body is covered with a paste that contains alkali metal.

Method to increase the strength of a form body of lithium silicate glass ceramic

The invention relates to a method for producing a monolithic form body, in particular a dental restoration, comprising the steps of: providing of a blank, producing of the form body through pressing and/or machining of the blank, and softening of the form body exclusively in its surface region by irradiation with infrared radiation.

Method to produce a monolithic form body

The invention relates to a method for the production of a restoration from a blank consisting of, or containing, a lithium silicate glass ceramic, wherein at least two layers of ceramic material of different compositions are filled into a mold layer-by-layer and after filling of the layers they are then pressed and sintered, wherein after filling of a first layer this is structured on its surface in such a way that the first layer, viewed across its surface, differs in its height from region to region, and then a layer with a composition that differs from the first layer is filled as a second layer into the mold. After sintering the dental restoration is produced from the blank by mechanical working.

Method for the production of a dental restoration

The invention relates to glass ceramics based on the lithium metasilicate system (LiO.SiO(LiSiO)), which are mechanically processible in a simple manner in an intermediate stage of the crystallization and, after complete crystallization, represent a high-strength, highly translucent and chemically stable glass ceramic.

Lithium silicate glasses or glass ceramics, method for production thereof and use thereof

The invention relates to glass-ceramics based on the lithium disilicate system which can be mechanically machined easily in an intermediate step of crystallisation and, after complete crystallisation, represent a very strong, highly-translucent and chemically-stable glass-ceramic. Likewise, the invention relates to a method for the production of these glass-ceramics. The glass-ceramics according to the invention are used as dental material.

The invention relates to glass-ceramics based on the lithium silicate system which can be mechanically machined easily in an intermediate step of crystallization and, after complete crystallization, represent a very strong, highly-translucent and chemically-stable glass-ceramic. Likewise, the invention relates to a method for the production of these glass-ceramics. The glass-ceramics according to the invention are used as dental material.

The invention relates to a blank for producing a dental molded part such as an inlay, onlay, crown or bridge, and to a method for producing the blank. To be able to machine a dental molded part, in particular one having thin wall thicknesses, from the blank without difficulty, the blank is designed to consist of a glass ceramic having a density of between 30 and 60% of theoretical density, and of glass-ceramic powder particles with a particle size distribution d&#x2266;80 &#x3bc;m, lithium silicate crystals being present in an amount of 10 to 90% by volume.

Process for producing a blank, and a blank

The invention refers to a method for producing a dental restoration comprising a lithium silicate glass or glass ceramic as well as a dental restoration inself. The invention further refers to a ingot with the same composition having a defined strength.

Dental restoration, method for its production and ingot

The invention relates to a method for producing a blank of lithium silicate glass a starting composition of at least 8 wt-% of a stabilizer selected from the group consisting of ZrO, HfO, and mixtures thereof, wherein the method includes the steps of mixing the raw materials comprising the stabilizer in powder form, wherein the powder of the stabilizer has a particle size d=x with 0.3 &#x3bc;m&#x2266;x&#x2266;1.5 &#x3bc;m, melting the raw materials in a crucible at a temperature Tand storing the melt in the crucible for a time t, pouring the homogenized melt into molds, wherein the melt flows out of the crucible with a discharge temperature Tbeing T&#x2267;T, wherein the filling of the molds and the molding of the melt in the molds takes place with a cooling rate A.

Method for producing a lithium silicate glass blank and a lithium silicate glass-ceramic blank

The invention relates to glass-ceramics based on the lithium disilicate system which can be mechanically machined easily in an intermediate step of crystallization and, after complete crystallization, represent a very strong, highly-translucent and chemically-stable glass-ceramic. Likewise, the invention relates to a method for the production of these glass-ceramics. The glass-ceramics according to the invention are used as dental material.

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Gelnhausen, Germany

Markus Vollmann