3m Innovative Properties Company

Solventum Intellectual Properties Company

Biocer Entwicklungs Gmbh

Helmar B Mayr

Malte Korten

Gallus Schechner

Gioacchino Raia

Adrian S Eckert

Bernhard Hofmann

Holger Hauptmann

Michael Jahns

Reinhold Hecht

Andreas G Herrmann

Brant Ulrick Kolb

Rainer A Guggenberger

Carsten Franke

Till Meurer

Oliver Kappler

Peter Bissinger

Robert L W Smithson

Melissa A Lackey

Christoph H Thalacker

Karsten Dede

Christian A Richter

Martin Goetzinger

Bastian P Kirchner

Bhaskar V Velamakanni

Mark J Hendrickson

Christine M Andres

Kathleen M Humpal

Anja Friedrich

Paul D Pennington

Daniel D Oberpertinger

Dietmar Blees

Robert Leland Wee Smithson

Sigrun Herrmann

Guenter Ziegler

Winfried Vonau

Frank Gerlach

Günter Ziegler

Kathleen M Humpa

Daniel Seitz

Bhaskar V Velmakanni

A method of building up at least a first () and a second () physical workpiece from a light hardenable material () on a 3D printing device (). 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.

Method of time-shifted and time-overlapping building up physical workpieces by additive manufacturing

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. The invention also relates to a cured article obtained by radiation curing this curable composition by use of an additive-manufacturing method.

Curable composition for producing a dental composite crown and process of production

A process for producing a sintered lithium disilicate glass ceramic dental restoration by way of sintering under reduced atmospheric pressure conditions at a temperature above 600° C. is described. Further described is a kit of parts for producing a sintered lithium disilicate glass ceramic dental restoration.

Process for producing a sintered lithium disilicate glass ceramic dental restoration and kit of parts

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.

System of a dental blank and an associated shade guide

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&#xb0; C. and a shear rate of 1 s. The invention also relates to a cured article obtained by radiation curing this curable composition by use of an additive-manufacturing method.

An additive manufacturing system has a light permeable base, a build carrier for holding a workpiece and a light source which is arranged to emit light through the light permeable base. The light permeable base and the build carrier are positionable relative to each other in a build dimension in which the workpiece is built up. The system further has a resin vat in which the light permeable base forms a wall portion thereof. The system further comprises a plurality of resin supplies for supplying different light hardenable resins in direct contact with each other in said vat. The system facilitates the rapid manufacturing of a dental restoration having a color gradation.

Additive manufacturing system and a method of additive manufacturing

The invention relates to a preformed dental composite crown being characterized by its shape and chemical composition, the shape being characterized as follows: having an occlusal top surface and depending buccal, mesial, distal and lingual side surfaces, the side surfaces being connected to each other and forming a crown cervix, the wall thickness of the crown at the crown cervix being lower than 0.6 mm; at least two of opposing depending side surfaces having a concave shape; the chemical composition of the material the preformed dental composite crown is made of being a hardened composition comprising the following components: nano-filler(s) in an amount from 20 to 70 wt. %, resin matrix in an amount from 20 to 75 wt. %, wt. % with respect to the weight of the chemical composition, the resin matrix comprising urethane(meth)acrylate(s) and (meth)acrylate(s) not comprising a urethane moiety. The invention also relates to a kit of parts comprising such a preformed dental composite crown, processes for producing such crowns and the use of such a crown for treating a dental tooth.

Preformed dental composite crown, process of production and use thereof

A device for progressively building up an object from a light hardenable material. The device has a perforated build platform for the object. The build platform forms a build surface that faces a light source. The build platform and the light source are positionable relative to each other by computer control. The device is further configured for supplying the light hardenable material through the perforation of the build platform for building up the object. The invention enables the making of colored objects by stereolithography.

Device and method for progressively building up an object from a light hardenable material

The invention relates to the use of a printing sol as construction material in an additive manufacturing process for producing a 3-dim article, the printing sol comprising solvent(s), nano-sized crystalline zirconia particles in an amount from 2 to 25 vol.-% with respect to the volume of the sol, the average primary particle size of the nano-sized crystalline zirconia particles being in a range up to 50 nm, a first monomer being a polymerizable surface modification agent represented by formula A-B, with A being capable of attaching to the surface of the nano-sized crystalline zirconia particles and B being a radiation curable group, optionally a second monomer, the second monomer comprising at least one radiation curable moiety but no acidic or silane group(s), photo initiator(s). The invention also relates to a ceramic article obtainable according to such a process.

Sol containing nano zirconia particles for use in additive manufacturing processes for the production of 3-dimensional articles

A method of making a dental article, has steps of (i) providing a layer of sinter powder, (ii) providing a solidifiable binder to form a circumferential fixation zone () which encloses a portion of the powder layer. The method further has the step of repeating steps (i) and (ii) with each fixation zone () of one layer being in contact with a fixation zone () of an adjacent layer such that a plurality of the fixation zones () together form a coherent hollow sleeve () extending across the layers. The corresponding plurality of powder portions in combination form a contiguous batch () of powder captured in the sleeve. The method facilitates the manufacturing of sintered dental articles.

Method of making a dental articles

A method of building up a dental object includes steps of (i) determining the three-dimensional shape of the object; (ii) mixing at least a first and a second component to form a hardenable composition; (iii) depositing the hardenable composition through a nozzle; (iv) performing steps (ii) and (iii) in combination with moving the nozzle by computer control based on said data. The invention helps providing an object like a dental restoration at maximized geometric and optical quality.

Method of and system for building up a dental object

An additive manufacturing system has a light permeable base (), a build carrier () for holding a workpiece () and a light source () which is arranged to emit light through the light permeable base (). The light permeable base () and the build carrier () are positionable relative to each other in a build dimension in which the workpiece () is built up. The system further has a resin vat () in which the light permeable base () forms a wall portion thereof. The system further comprises a plurality of resin supplies () for supplying different light hardenable resins in direct contact with each other in said vat (). The system facilitates the rapid manufacturing of a dental restoration having a color gradation.

A method and system for making a dental restoration are provided. The method comprises the step of providing a computer model of a three-dimensional reference surface that is based for example on a tooth structure of a tooth to be restored in a patient's dentition. The method further comprises the steps of visualizing the three-dimensional reference surface, providing a user operable virtual material deposition tool, and using the virtual material deposition tool to deposit a plurality of differently colored layers on the reference surface. The system provides functionality to perform the method of the invention. The invention preferably helps maximizing optical and geometrical quality in a dental restoration.

Method and system for making a dental restoration

The present invention relates to a process for producing a ceramic article, the process comprising the steps of providing a printing sol, the printing sol comprising solvent, nano-sized particles, radiation curable monomer(s) and photoinitiator, the printing sol having a viscosity of less than 500 mPa*s at 23&#xb0; C., processing the printing sol as construction material in an additive manufacturing process to obtain a 3-dim article being in a gel state, the 3-dim article having a Volume A, transferring the 3-dim article being in a gel state to a 3-dim article being in an aerogel state, heat treating the 3-dim article to obtain a sintered 3-dim ceramic article, the ceramic article having a Volume F, Volume A of the 3-dim article in a gel state being more than 500% of Volume F of the ceramic article in its sintered state. The invention also relates to a ceramic article obtainable according to such a process. The ceramic article can have the shape of a dental or orthodontic article.

Growing community of inventors

Kaufering, Germany

Helmar B Mayr