Abstract: The invention discloses a process for producing dental shaped parts which consists entirely of porous glass without crystalline portions. The density of the blank is between 50% and 95% of its theoretical density. It has a discoidal shape with a diameter of at least 20 mm. The blank is produced by a process in which glass powder is first pressed at a pressure of between 10 MPa and 300 MPa and this green body is (pre-)sintered at a temperature of between 580° C. and 750° C. to form a blank of porous glass without crystalline portions. From the obtained blank, monolithic dental shaped parts can be obtained by mechanical processing followed by sintering, wherein a process according to the invention for stabilizing the shape of the shaped parts is used.

Abstract: The invention relates to a dental prosthesis, produced from a one-piece or two-piece prosthesis blank which is constructed from a gum-colored material and a tooth-colored material (32), in particular in each case on a plastic base. It is characterized by the tooth-colored material (32) of the blank (10) which, in the blank state, has a size larger than a human dental arch. It is in particular at least 8 cm wide. The invention is further characterized in that the gum-colored and the tooth-colored material (10 and 32) are intensively connected to each other, whether by one-piece production, by adhesive bonding or by polymerization, in particular by polymerization. Viewed along the course of the dental arch, the interface between the materials has an undulating shape and, viewed in the vestibular direction, has a radial shape.

Abstract: The invention relates to a lithium silicate glass ceramic which contains lithium silicate as main crystal phase and scheelite and/or powellite as further crystal phases. The invention also relates to a corresponding starting glass, a starting glass with nuclei, a process for producing the glass ceramic and the starting glasses as well as the use thereof.

Abstract: The invention relates to a single- or multi-unit dental restoration, which consists of a support structure and a veneer, which support structure is in particular made from oxide ceramics by means of additive manufacturing, particularly preferably by means of rapid prototyping, wherein the veneer is produced by pressing a ceramic material, such as a glass ceramic or composite material, which is more translucent than the support structure, characterized in that the veneer fills and/or penetrates recesses of the support structure (12) configured as a net or frame structure or as a reinforcement, wherein it is particularly provided that the recesses penetrate through the support structure (12).

Abstract: Slip for the stereolithographic preparation of ceramic or glass ceramic shaped parts which comprises (a) at least one radically polymerizable monomer, (b) at least one photoinitiator, (c) ceramic and/or glass ceramic particles and (d) at least one non-ionic surfactant.

Abstract: A device for producing dental ceramic, with a CAD/CAM device for preparing a compression molding cavity for producing the dental ceramic, wherein a CAD device thereof, on the basis of scan data, determines the shape of the dental ceramic to be produced, and wherein a CAM device thereof produces a positive model, on the basis of which the mold cavity is produced via a sacrificial mold (muffle). The CAM device also determines the distribution and the transfer between different ceramic types, i.e. types of ceramics that differ at least in respect of one parameter in terms of material, appearance, strength or the like, wherein the CAM device for adjusting the distribution and the transfer determines the position and the dimensions of a feed channel between a muffle rod and the compression molding cavity for producing the dental ceramic according to at least one of these parameters.

Abstract: Lithium silicate-wollastonite glass ceramics are described which are characterized by a controllable translucence and can be easily machined and therefore can be used in particular as restoration material in dentistry.

Abstract: The invention relates to a dental machine tool, in particular a dental milling machine (10), having a tool (12) that is changeable in particular via a tool bank (16), and a workpiece holder (14) for receiving a workpiece such as a dental blank made of ceramic, composite or plastics material such as PMMA, and having a housing (24) which is closable during machining by the machine tool, and having a negative-pressure connection to the housing (24). At least one air nozzle (30) that is fitted on or in the housing (24) is directed towards the workpiece and/or the workpiece holder (14) and/or the tool (12) and/or the tool bank (16) and/or a pane of a front flap of the machine tool. Said air nozzle (30) is equipped with at least one electrode for generating an electric field in the region of the nozzle or in front of the latter, and at least one nozzle comprising at least one electrode is directed towards that side of the workpiece or of the workpiece holder (14) on which the tool (12) machines the workpiece.

Abstract: Radically polymerizable dental material which contains (a) at least one polyfunctional radically polymerizable monomer, (b) at least one further radically polymerizable monomer which can be monofunctional or polyfunctional, (c) at least one photoinitiator for the radical polymerization and (d) at least one filler. The material is characterized in that the mixture of the monomers (a) and (b) has a refractive index of from 1.50 to 1.70 and in that the refractive index of the monomer mixture before the curing corresponds to the refractive index of the filler used or is higher by up to 0.013 and after the curing is higher than the refractive index of the filler by at least 0.02.

Abstract: Acyl germanium compound according to general formula [RmAr—(C?O)—]4—Ge and process for the preparation thereof. The compound is suitable as initiator for radical polymerization.

Abstract: A cluster mill blank includes a framework constructed to cooperate with a blank holder of an existing CAD/CAM system, and a plurality of sub-blanks attached to the framework forming an addressable matrix or cluster blank. CAD/CAM systems including such a framework, as well as associated methods are described.

Abstract: Dental material which contains at least one vinylcyclopropane of the general formulae I, in which A, B independently of each other are in each case OH or COOH; X, Y independently of each other are in each case O or NH; R1, R2 independently of each other are in each case H or an aliphatic linear or branched C1-C10 hydrocarbon radical which can be interrupted by O, S or an ester group; and n, m independently of each other are in each case 0, 1 or 2, wherein, if X?Y?O, R1?H and R2?H, n+m?1. The vinylcyclopropanes are characterized by a low shrinkage and a high reactivity on radical polymerization and are suitable in particular for the preparation of dental materials.

Abstract: Lithium silicate-low quartz glass ceramics are described which are characterized by a combination of very good mechanical and optical properties and can therefore be used in particular as restoration material in dentistry.

Abstract: The invention relates to a homogenizer having an input surface and an output surface which are incongruent to one another, at least one inclined surface extending between the input surface and the output surface. The inclined surface is corrugated. According to the invention, the homogenizer is designed as a hollow element which surrounds the LED chips (14) reflectively.

Abstract: Pre-sintered blanks based on lithium disilicate glass ceramic are described which are suitable in particular for the preparation of dental restorations.

Abstract: Lithium silicate-diopside glass ceramics are described which are characterized by a controllable translucence and can be satisfactorily processed mechanically and therefore can be used in particular as restoration material in dentistry.

Abstract: The invention shows a dental press furnace comprising a pressing punch (36) which acts on a green product (32) made of in particular a ceramic mass—possibly by means of an interposed ram (28)—, the green product (32) being guided in a press channel (30) which is configured in a muffle (24), and a pressure, distance and/or speed sensor detecting at least one motion parameter of the pressing punch (36), and comprising a control device for controlling the pressing process based on the output signal of the sensor, the trigger criterion for the start of the pressing process being a change of at least one motion parameter of the pressing punch upon heating and/or softening of the green product which change is detected by means of the sensor.

Abstract: A blank which is provided for producing dental shaped parts such as crowns, bridges, veneers, abutments and the like, already has at least one preform of a dental shaped part, which is available for producing this shaped part. In particular, the preforms in the blank are prepared by machining of the blank, preferably by cutting, sawing, grinding, drilling and/or milling. The preforms are in particular preforms for single crowns.

Abstract: The invention relates to a method for processing a dental material (28), in particular pressing and curing a dental material, by means of —a molding insert (30) that has a pre-pressing area (22) which adjoins a molding area (14, 16), wherein the pre-pressing area (22) is designed to receive the dental material (28), and —a pressing furnace with a firing chamber (10) for receiving the molding insert (30).