Abstract: A computer-implemented method for generating a color 3D model for a dental restoration. The method receives color information, a color distribution map, and shape for a tooth. The color information is assigned to the color distribution map. The color information and the color distribution map are then combined with the shape to generate a digital color 3D model. The resulting 3D model includes volumes for different color materials for the restoration to provide for color transition zones, which can be 3D printed from the 3D model to made a corresponding restoration.

Abstract: The invention relates to a curable composition comprising a (meth)acrylate not comprising an urethane moiety, an urethane (meth)acrylate, photo-initiator, discrete filler particles having an average particle size in the range of 10 to 40 nm, having been surface treated with a silane surface treating agent selected from a silane surface treating agent comprising a (meth)acrylate moiety, a silane surface treating agent not comprising a (meth)acrylate moiety, and a mixture of both, and the discrete filler particles being present in an amount of 20 wt. % or more, the curable composition further comprising additives, the curable composition not comprising the following components alone or in combination: aggregates of nano-sized particles, agglomerates of nano-sized particles, fumed silica, each in an amount of 2 wt. % or more, wt. % with respect to the curable composition.

Abstract: The invention relates to a 3d-printed dental restoration precursor, a 3d-printed array comprising a 3d-printed dental restoration precursor, a kit of parts comprising at least two 3d-printed dental restoration precursors or 3d-printed dental restorations and a process of producing such a 3d-printed array, 3d-printed dental restoration precursor or 3d-printed dental restorations. The 3d-printed dental restoration precursor comprises at least one crown unit having an outer surface and an inner surface and at least one support element having a fixation section. The support element is connected through the fixation section to the outer surface of the crown unit in a particular region.

Abstract: A 3D printing system is disclosed, comprising a 3D printing device with a build plate and at least two workpiece holders, each having a manufacturing surface for additive manufacturing. The system includes an adapter with recesses for receiving portions of the workpiece holders, allowing the workpiece holders to be releasably attached to the build plate. The system also integrates post-processing devices controlled by a handling robot and a controller to streamline the manufacturing process, ensuring high precision and efficiency. Additionally, the disclosed technology covers a method for manufacturing at least two workpieces using the 3D printing system, which includes steps for hardening layers of material and removing workpieces post-production. Furthermore, the system includes an adapter set for attaching workpiece holders to the 3D printing device, enabling efficient transitions between different manufacturing stages and enhancing overall productivity.

Abstract: The present disclosure provides apparatuses and methods for manufacturing three-dimensional objects. Each additive manufacturing apparatus (1000, 2000, 3000) includes: a) a reservoir (1100, 2100, 3100) for receiving hardenable material; b) a first movable light engine (1200, 2200, 3200) providing a first light radiation configuration; a second light engine (1300, 2300, 3300) providing a second light radiation configuration that is different than the first light radiation configuration; and d) a light altering structure (1400, 2400, 3400). The light altering structure is located between the reservoir and light radiated from at least one of the first movable light engine or the second light engine. The first movable light engine is configured to radiate light onto a first focal plane (2220) within the reservoir containing the hardenable material and the second light engine is configured to radiate light onto a second focal plane (2320) within the reservoir containing the hardenable material.

Abstract: A method of building up at least a first (10) and a second (20) physical workpiece from a light hardenable material (105) on a 3D printing device (100). The method has the steps of providing to the 3D printing device a first dataset for building up a first workpiece; starting a first print job based on the first dataset; providing to the same 3D printing device a second dataset for building up a second workpiece after the start the first print job; and starting a second print job based on the second dataset before finishing the first print job.

Abstract: The present disclosure provides methods including obtaining an insert comprising a sieve defining openings each having a diameter of 10 to 200 micrometers; placing a volume of a fluid containing a photopolymerizable composition and a contaminant in the insert; and subjecting the volume of the fluid to a centrifugal force to separate the contaminant from at least a portion of the photopolymerizable composition by retaining the contaminant in the insert and passing at least a portion the photopolymerizable composition through the sieve of the insert to provide a separated photopolymerizable composition. Systems are also provided, including an additive manufacturing apparatus, a centrifuge, and an insert configured to be inserted into the centrifuge. The methods and systems can advantageously assist in reclaiming photopolymerizable composition that has been contaminated, for reuse.

Abstract: The invention relates to A curable composition for producing dental composite crowns, the composition comprising a resin matrix comprising polymerizable (meth)acrylate(s) not comprising a urethane moiety, polymerizable urethane(meth)acrylate(s), wherein the polymerizable (meth)acrylate(s) not comprising an urethane moiety are used in excess over the polymerizable urethane(meth)acrylate(s), a filler matrix comprising nanocluster(s), fumed silica in an amount below 8 wt. % with respect to the weight of the whole composition, an initiator system comprising photoinitiator(s), organic dye(s), the curable composition not comprising softener in an amount of more than 5 wt. % with respect to the weight of the whole composition, the curable composition having a viscosity below 150 Pa*s at 23° C. and a shear rate of 1 s?1. The invention also relates to a cured article obtained by radiation curing this curable composition by use of an additive-manufacturing method.

Abstract: A method of building up a physical object by additive manufacturing which has the steps of building up the object and at least one support structure layer by layer along a build axis. The support structure supports the object relative to a build platform. During building up the object and the at least one support structure a connection is provided between the support structure and the object by a plurality of layers each of which being a common layer of the object and the support structure.

Abstract: The present disclosure provides a build platform for use in an additive manufacturing device that is builds up an object from layers of a light-hardenable resin, wherein the build platform comprises a build surface for building up the object thereon, and wherein the build surface comprises a ceramic material. The disclosure also provides a method of making a build surface comprises a ceramic surface. Further, the disclosure provides additive manufacturing devices that include build platforms comprising ceramic material. The disclosure also describes articles made using the methods and devices described.

Abstract: Dental crowns having securing protrusions, methods of preparing said dental crowns, and methods of repairing a tooth with said dental crowns are described.

Abstract: A computer-implemented method for generating a color 3D model for a dental restoration. The method receives color information, a color distribution map. and shape for a tooth. The color information is assigned to the color distribution map. The color information and the color distribution map are then combined with the shape to generate a digital color 3D model. The resulting 3D model includes volumes for different color materials for the restoration to provide for color transition zones, which can be 3D printed from the 3D model to made a corresponding restoration.

Abstract: The present disclosure provides a method of making a three-dimensional article. The method includes a) inkjetting a sol through a nozzle having a diameter of 10 to 70 micrometers to form droplets of printed sol; b) solidifying the printed sol to form a portion of the three-dimensional article; and c) repeating steps a) and b) to form the three-dimensional article having a specified geometry. The sol includes i) 5 to 40 percent by volume of metal oxide particles, based on the total volume of the sol; ii) a solvent; iii) a surface modifying agent; and iv) optionally a polymerizable component. The metal oxide particles have an average particle size of 20 nanometers or less and of 1/100 to 1/10,000 of a diameter of the nozzle. The method enables high resolution additive manufacturing of an object having differences in one or more optical or mechanical property over a small area or volume of the object.

Abstract: A device (1) for spinning a 3D printed workpiece (100). The device has a rotor (2) for spinning about a spinning axis (A) and a receptacle (8) for holding the workpiece (100). The receptacle (8) is pivotally attached to the rotor (2) for swiveling about a swivel axis (B) that is transverse to the spinning axis (A). The pivotal attachment enables swiveling of the receptacle (8) between a first angular orientation relative to the spinning axis (A) and a different second angular orientation relative to the spinning axis (A). The device (1) further has a balancing weight (9) that is movably arranged relative to the receptacle (8). The balancing weight (9) is lockable at different distances relative to the receptacle (8).

Abstract: The present disclosure provides apparatuses and methods for manufacturing three-dimensional objects. Each additive manufacturing apparatus (1000, 2000, 3000) includes: a) a reservoir (1100, 2100, 3100) for receiving hardenable material; b) a first movable light engine (1200, 2200, 3200) providing a first light radiation configuration; a second light engine (1300, 2300, 3300) providing a second light radiation configuration that is different than the first light radiation configuration; and d) a light altering structure (1400, 2400, 3400). The light altering structure is located between the reservoir and light radiated from at least one of the first movable light engine or the second light engine. The first movable light engine is configured to radiate light onto a first focal plane (2220) within the reservoir containing the hardenable material and the second light engine is configured to radiate light onto a second focal plane (2320) within the reservoir containing the hardenable material.

Abstract: A method of forming a dental restoration for a tooth having an outer surface includes acquiring a first three-dimensional representation representative of the outer surface of the tooth; generating a design of a first part of the dental restoration based on the first three-dimensional representation of the tooth; forming the first part of the dental restoration; preparing the tooth to form a prepared tooth while forming the first part of the dental restoration; obtaining a second three-dimensional representation of the prepared tooth; generating a design of a second part of the dental restoration based on at least the second three-dimensional representation of the prepared tooth; merging the design of the second part of the dental restoration to the first part of the dental restoration; and forming the second part of the dental restoration.

Abstract: The present disclosure provides methods including obtaining an insert comprising a sieve defining openings each having a diameter of 10 to 200 micrometers; placing a volume of a fluid containing a photopolymerizable composition and a contaminant in the insert; and subjecting the volume of the fluid to a centrifugal force to separate the contaminant from at least a portion of the photopolymerizable composition by retaining the contaminant in the insert and passing at least a portion the photopolymerizable composition through the sieve of the insert to provide a separated photopolymerizable composition. Systems are also provided, including an additive manufacturing apparatus, a centrifuge, and an insert configured to be inserted into the centrifuge. The methods and systems can advantageously assist in reclaiming photopolymerizable composition that has been contaminated, for reuse.

Abstract: A system having at least one dental blank and an associated shade guide. The dental blank exhibits a non-uniform color shading, and the shade guide comprises a plurality of shade specimens each exhibiting a particular color shading representing the same color shading present in a partial area within the dental blank. A method of making a dental restoration includes the use of the system. The invention facilitates making a dental restoration having a color shading resembling the color shading of a natural tooth.

Abstract: A method of making a physical object by additive manufacturing. The method has the steps of providing a light hardenable primary material (11), building up the object (100) by successively hardening portions of the light hardenable primary material (11) by irradiating the portions with light, coating at least a part of the object (100) with a light permeable coating or oxygen protective material; and irradiating the coated object (100) with light and thereby post-hardening any light hardenable material (11).

Abstract: The invention relates to A curable composition for producing dental composite crowns, the composition comprising a resin matrix comprising polymerizable (meth)acrylate(s) not comprising a urethane moiety, polymerizable urethane(meth)acrylate(s), wherein the polymerizable (meth)acrylate(s) not comprising an urethane moiety are used in excess over the polymerizable urethane(meth)acrylate(s), a filler matrix comprising nanocluster(s), fumed silica in an amount below 8 wt. % with respect to the weight of the whole composition, an initiator system comprising photoinitiator(s), organic dye(s), the curable composition not comprising softener in an amount of more than 5 wt. % with respect to the weight of the whole composition, the curable composition having a viscosity below 150 Pa*s at 23° C. and a shear rate of 1 s?1. The invention also relates to a cured article obtained by radiation curing this curable composition by use of an additive-manufacturing method.