Abstract: 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 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.

Abstract: 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.

Abstract: The invention relates to glass ceramics based on the lithium metasilicate system (Li2O.SiO2(Li2SiO3)), 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: The invention relates to a method for ascertaining material characteristics of an object, in particular optical properties of preferably semi-transparent objects. The aim of the invention is to obtain material characteristics without complex measuring methods. This is achieved in that spectrally resolved data from measured data of the object are calculated with spectrally resolved data of a reference body in order to ascertain the material characteristics, the measured data being ascertained with a confocal 3D measuring system.

Abstract: A process for determining 3-D data of at least one prepared jaw area, such as a prepared tooth stump, by mechanically scanning the jaw area and digitizing the measured values determined during the scanning. The jaw area is prepared with a dental instrument having positions which are optically measured during the preparation, and the 3-D data is determined from the positions of the dental instrument that are associated with the prepared jaw area.

Abstract: A method and arrangement for transmitting radiation emitted by LEDs operated in pulsed operation via at least one optical waveguide, wherein a first optical waveguide having first and second coupling surfaces is assigned to each LED, the first optical waveguides are in each case aligned, by their first coupling surfaces, with an assigned stationary LED, the second coupling surfaces are arranged on a closed path and a coupling surface of a second optical waveguide is assigned to the second coupling surfaces. In order that a high light power can be coupled into the second optical waveguide by means of the LEDs, it is provided that the second optical waveguide, in accordance with the clocking of the switched-on LEDs, can be aligned with the second coupling surface of a first optical waveguide from at least one switched-on LED.

Abstract: 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.

Abstract: 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.

Abstract: Method of producing a dental ceramic structure by digitizing a model or partial model of the prosthesis to be produced and generating a CAD data set, cutting each section of the muffle based on the CAD data set to form the cavity, pressing the ceramic into the cavity by way of at least one sprue, removing the hardened ceramic from the cavity with the sprue or flash and removing the sprue or flash based on the CAD data set.

Abstract: A method for manufacturing a dental restoration for at least one section of a dental arch on the basis of digital overall data which are calculated in relation to individual data, which are based on three-dimensional optical individual measurements that are performed intra-orally of an area that contains at least one section of the dental arch. In order to ensure that the overall data, which have been received from individual measurements, represent the measured section of the dental arch and/or the dental arch in its entirety without any distortions, it is proposed that at least one area of the dental arch be measured together with a reference, which supplies three-dimensional information, and calculated from the individual data while considering the reference of the overall data.

Abstract: The invention relates to glass ceramics based on the lithium metasilicate system (Li2O SiO2 (Li2SiO3)), 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.

Abstract: A dental alloy with a high gold content that is devoid of palladium and copper. To achieve high mechanical stability, the dental alloy contains between 75 and 95 wt. % Au, between 5 and 20 wt. % Pt, between 0.5 and 3.5 wt. % Zn and/or Sn and/or In, between 0.1 and 0.8 wt. % of an element of a group I, in addition to a single particle refiner of a group II. The weight fraction of the element of group I is between 2 and 6 times that of the single particle refiner of group II, and one element of group I is represented by Nb or Ta or Ti or V and the particle refiner of group II is represented by Ir or Rh.

Abstract: A procedure for dimensionally accurate sintering of a shaped piece manufactured from a blank of porous ceramic material, in which during the sintering, the shaped piece remains connected via at least one first connection like a rib, with a support that is manufactured from the blank. To ensure with simple procedural steps and simple design measures that the geometry does not change during sintering, the invention provides that the support is manufactured as a section of the blank that at least in sections surrounds the shaped piece by materials removal processing from the blank, and after the manufacture, the support, for one, is connected via the at least one first connection with the shaped piece, and for another, via at least one second connection with the residual blank that in sections is separated from the support.

Abstract: A measuring arrangement and a method for the three-dimensional measurement of at least part of an object includes a light source with a continuous spectrum, a device for generating a multifocal lighting pattern, a lens with a large chromatic aberration for imaging foci of the lighting pattern on the object, a detection unit for generating the wavelength spectrum of the foci that are confocally imaged on the object via the lens, and a spectrum-dispersive device disposed between the confocally imaged foci and the detection device. In order to create a highly accurate surface profile in a relatively short time even in the case of moving objects, the invention proposes that a first hole pattern including first holes be disposed in the plane of the confocally imaged foci, the geometric arrangement of the first holes corresponding to the geometric arrangement of the foci of the multifocal lighting pattern.

Abstract: A method for manufacturing a multipart assembly of sintered oxide ceramic material, including one first component which at least partially surrounds one second component in such a manner that detaching the first component from the second component is not possible without destroying the first and/or second component. The assembly is produced by producing a single-part first shaped part and a single-part second shaped part from an oxide ceramic blank, whereby the first shaped part and the second shaped part are enlarged to compensate for the shrinkage during sintering, and assembling the sintered shaped part as second component with the first shaped part and subsequently sintering them together.