Abstract: Glass ceramics having SiO2 as main crystal phase and precursors thereof are described which are characterized by very good mechanical and optical properties and in particular can be used as restoration material in dentistry.

Abstract: The present invention relates to a pre-sintered multi-layered dental mill blank comprising a top layer, a bottom layer, and at least one intermediate layer. The pre-sintered multi-layered dental mill blank or a part prepared thereof has one or more desirable properties when being fully sintered by a speed sintering process. The present invention also relates to a process for preparing a dental restoration using the pre-sintered multi-layered dental mill blank as well as to a dental restoration as such. The present invention further relates to a process for sintering a dental restoration precursor.

Abstract: The present invention relates to a method for producing an adhesive bond, comprising the steps of curing (S101) a light-curing adhesive material by means of light; detecting (S102) a degree of polymerization of the adhesive material; and terminating (S103) the curing at a specified degree of polymerization.

Abstract: An aluminium oxide ceramic material containing the following components: component wt.-% Al2O3 ?95.0 to 99.989 MgO 0.001 to 0.1 Eu, calculated as Eu2O3 ?0.01 to 1.0.

Abstract: A method of producing a dental object (100), including the steps of producing a pillared support structure (101) on the dental object (100); and producing a lattice structure (103) for reinforcing the support structure (101).

Abstract: A method for excavating tooth material, having the steps of placing (S101) a structure-borne sound sensor on a tooth; excavating (S102) the tooth material by means of a fluid jet; detecting (S103) structure-borne sound signals during excavation by the structure-borne sound sensor; and regulating or controlling (S104) a fluid jet generating device based on the structure-borne sound signals.

Abstract: A process control method for a 3D-printing process using a 3D printer. The 3D printer has a build platform, a light source, a receiving device for printing material and a control device by which an object can be produced layer-wise or continuously from the printing material. The method includes using a thermal imaging camera, the output signal of which is transmitted to the control device, connected to the 3D printer, The method includes the following steps: illuminating a layer or parts of said layer positionally selectively, detecting the temperature of the layer during the polymerisation using the thermal imaging camera, ending the building process of a layer by ending the illumination, the time of the end of the illumination being established by a predefined temperature Tmax or a predefined change in temperature dT/dt being reached.

Abstract: A method for determining a tooth colour providing an evaluation device having an iterative learning algorithm using CNNs which captures and evaluates images under different light conditions and capture angles and learns the assignment to the applicable pattern tooth colour. In an evaluation step, a capture device is provided with which an image of an auxiliary body with a previously known pattern tooth colour is captured together with at least one tooth. The capture device acquires at least two images of the combination of the tooth to be determined and the auxiliary body from different capture angles and forwards them to the evaluation device. The evaluation device, based on the assignment learned to the applicable sample tooth colour, evaluates the captured images and outputs the tooth colour of the tooth to be determined according to a reference value, such as a common tooth key, e.g. A1, B2, etc.

Abstract: Process and slip for the production of ceramic shaped parts made of zirconium oxide ceramic by a 3D inkjet printing process. The slip contains zirconium oxide which is suspended in a liquid medium, wherein the slip has a zirconium oxide content of from 68 to 88 wt.-% and contains not more than 5 wt.-% organic components. The process for the production of ceramic components comprises the layered shaping and subsequent sintering of the desired component from the slip.

Abstract: A method for exporting a three-dimensional dental design model based on a three-dimensional dental library model (4) from an augmented reality application (6) which is adapted to visualize an image of the dental library model (4) rendered by a virtual camera with a preliminary pose and scale in a photo (2) of a face of a patient taken by a camera under a viewing axis to the face of the patient, the photo (2) including a mouth opening showing at least part of the present situation of the patient's dentition.

Abstract: A material for use as support material for energy-pulse-induced transfer printing, which contains (a) at least one energy transformation component, (b) at least one volume expansion component and (c) at least one binder and which has a viscosity at 25° C. of from 0.2 Pas to 1000 Pas and a surface tension at 25° C. of from 20 to 150 mN/m. The invention furthermore relates to a process for producing three-dimensional objects using the support material.

Abstract: The present invention relates to a dental blank, in particular a parallelepipedal block, having an upper surface and a lower surface, which is composed of a flesh-coloured material and a tooth-coloured material. The flesh-coloured material and the tooth-coloured material are bonded together. The interface between the materials with elevations and depressions formed in or at the interface extends through an optionally curved plane, which plane is parallel to or oblique to at least a portion of the surfaces of the blank.

Abstract: A polymerizable composition, which includes (a) at least one radically polymerizable oligomer, (b) at least one radically polymerizable monomer and (c) at least one initiator for the radical polymerization, characterized in that the radically polymerizable oligomer (a) is selected from the group consisting of aliphatic urethane (meth)acrylate oligomers, epoxy (meth)acrylate oligomers and polyether urethane (meth)acrylate oligomers, and the radically polymerizable monomer (b) is polyfunctional.

Abstract: A holding device (100) for a round dental blank (200). The holding device has an open ring element (101) for laterally gripping the dental blank (200) and a closing element (103) for closing the ring element (101) at various positions.

Abstract: A dental prosthesis is provided, manufactured from a monobloc or multibloc prosthesis blank (10), which is composed of a gum-colored material (14) and a tooth-colored material (12), which materials (12, 14) are bonded to each other by bonding, polymerization and/or one-piece manufacture. The boundary surface (16) between the materials is wave-shaped comprising alternating grooves (22) and ribs (24) in the course of the dental arch, and radial in an oral-vestibular direction in the region of the anterior teeth (33) to be created. The boundary surface (16), at least in the region of the molars (26)—again as viewed in the oral vestibular direction—has parallel grooves (22) and ribs (24) forming troughs and crests of the waveform, or grooves (22) and ribs (24) such that they extend in deviation from parallel by at most 10 degrees, in particular at most 5 degrees, at least in the region of the molars (26).

Abstract: A one-piece or multi-piece prosthesis blank for manufacturing a dental prosthesis. The blank is constructed from a gum-colored material and a tooth-colored material. It is characterized by being connected to each other at connecting surfaces, having an interface between the gum-colored and tooth-colored materials. This interface, when viewed along the connecting surfaces has an undulating shape and viewed in the vestibular direction has a radial shape. In order to finish the dental prosthesis, a CAD/CAM device determines the exact course of a gingival line, based on patient-specific data, and produces the prosthesis.

Abstract: The inventive film clamping element (10) is held using a lip ring (14) and a vestibular ring (16), between which and possibly beyond which a film (12) extends. The film (12) and also said rings (14, 16) are elastically deformable and it is provided that the film (12) comprises an attachment (24, 26) each at two positions opposite one another. Between these attachments (24, 26) at least one elastic band (20, 22) extends which is suitable to constrict the film (12) radially towards the inside.

Abstract: The invention relates to a clamping device (10) for a tool (18) on a machine tool having a holder block (12) with at least 2, in particular a multiplicity of, apertures (16) for receiving clamping sleeves (14), wherein at least two clamping sleeves (14) are received in the apertures (16). Each clamping sleeve (12) has a clamping element (36), with which a tool (18), in particular a shaft (20) of a tool (18), can be clamped. The clamping sleeve (14) at least partially passes through in each case the aperture (16) in the holder block (12) and has, at its end opposite the clamping element (36), the rear end, an expansion element (34) which engages behind the holder block (12) or a counter-support element (30) of the holder block (12).

Abstract: The invention concerns a supra structure abutment holder for holding an arrangement of supra structure 16 and abutment 14, with a clamping device 12 for the arrangement, and is characterized in that clamping device 12 is adjustable in its height relative to an auxiliary device 26, in particular via threads.

Abstract: Radically polymerizable dental material, which includes a combination of a hydroperoxide and a thiourea derivative according to the following Formula (I) as initiator system for the radical polymerization: in which R is absent or is an (n+1)-valent, aromatic, aliphatic, linear or branched C1-C50 hydrocarbon radical, which can be interrupted by one or more ether, thioether, ester, amide or urethane groups; PG is a radically polymerizable (meth)acrylate, (meth)acrylamide or vinyl group; and n is 1, 2 or 3.