Technische Universitāt Wien

Ivoclar Vivadent Ag

Align Technology, Inc.

Jürgen Stampfl

Robert Liska

Wolfgang Josef Wachter

Johannes Patzer

Jörg Ebert

Christoph Appert

Chunhua Li

Yan Chen

Srinivas Kaza

Gottfried Rohner

Peter Dorfinger

Christian Gorsche

Heinrich Gruber

Markus Kury

György Harakaly

Volker Rheinberger

Norbert Moszner

Jürgen Rudolf Laubersheimer

Johannes Homa

Franz Varga

Monika Schuster

Gerald Mitteramskogler

Dieter Voser

Peter Gruber

Aleksandr Ovsianikov

Helga Bergmeister

Günter Weigel

Claudia Dworak

Helga Lichtenegger

Robert Inführ

Bernhard Steyrer

Christian Heller

Stefan Baudis

Simon Gruber

Johannes Benedikt

In a method for lithography-based generative production of three-dimensional components, in which material that can be solidified under the effect of electromagnetic radiation is arranged in a vat, a build platform is positioned at a distance from the vat bottom, material located between the build platform and the vat bottom is irradiated at selected locations with the aid of an irradiating unit, the electromagnetic radiation is introduced into the material from below through a vat bottom that is transmissive to the radiation, at least in a certain region, and successively focused on focal points within the material, whereby a volume element of the material that is respectively located at the focal point is solidified. The solidification takes place by means of multiphoton absorption and the volume of the focal point is varied at least once during the method, and so the component is built up from solidified volume elements of different volumes.

Method for lithography-based generative production of three-dimensional components

Provided herein are curable compositions for use in a high temperature lithography-based photopolymerization process, a method of producing crosslinked polymers using said curable compositions, crosslinked polymers thus produced, and orthodontic appliances comprising the crosslinked polymers.

Curable composition for use in a high temperature lithography-based photopolymerization process and method of producing crosslinked polymers therefrom

A light-curable composition is provided which may be used as a photopolymerizable material in an additive manufacturing process. The additive manufacturing process involves heating the light-curable composition which has a viscosity at 20&#xb0; C. of at least 20 Pa&#xb7;s. The light-curable composition includes a photopolymerizable matrix material, at least one thermoplastic polymer dissolved therein, and at least one photoinitiator. Polycaprolactone or a derivative thereof is used as the dissolved thermoplastic polymer.

Light-curable composition

A method and a device for processing a light-polymerizable material () for building up an object () in layers, using a lithography based generative manufacture having a construction platform () for building up the object (), a projecting exposure unit () that can be controlled for locally selected exposing of a surface on the construction platform () to an intensity pattern having a prescribed shape, and a control unit () prepared for polymerizing overlapping layers () on the construction platform () in successive exposure steps, each having a prescribed geometry, by controlling the projecting exposure unit (), in order to thus successively build up the object () in the desired shape, said shape resulting from the sequence of layer geometries. The invention is characterized in that a further exposure unit () for exposing the surface of the construction platform () is provided on the side opposite the projecting exposure unit (), and that the construction platform () is designed to be at least partially transparent to light, and that the control unit () is designed for controlling the further exposure unit () at least while building up the first layer (), said layer adhering to the construction platform (), for exposing in the prescribed geometry.

Device and method for processing light-polymerizable material for building up an object in layers

The invention relates to a method for the construction of a shaped body from photopolymerizable material by using lithography-based generative production, in which a layer of liquid photopolymerizable material is defined on a production platform, and is polymerized in an exposure region having a predetermined contour, a further layer of photopolymerizable material is defined, the layer defined last is polymerized in an exposure region having a predetermined contour for the layer defined last, and the latter two steps are repeated until a shaped body having a predetermined shape has been formed by the sequence of cured layers with contours predetermined layer by layer, each exposure in an exposure region having a predetermined contour being carried out by controlled activation of individual exposure elements in a two-dimensional array of exposure elements, each exposure element being assigned an image element, wherein the exposure of the exposure region is carried out by a common light source and by a two-dimensional light intensity modulator which is illuminated by the light source and which has a grid of individually controllable intensity modulators, in such a way that each illuminated intensity modulator forms and exposure element that exposes an image element in the exposure region, wherein a two-dimensional matrix is compiled for each exposure step of a layer, each element of the matrix being assigned to an exposure element in the array of exposure elements and control instructions for this exposure element being obtained in the form of a time-dependent function which individually establishes the intensity profile of the radiation of the exposure element over the exposure step, characterized in that, if a component of the intensity variation common to all time-dependent function of the intensity profiles of all exposure elements to be activated exists as a general intensity variation in an exposure step, this general intensity variation is carried out by controlling the intensity of the light source in accordance with the general intensity variation.

Method for the construction of a shaped body

A device for processing of highly viscous photopolymerizable material for layer-by-layer generation of a shaped body comprises a vat including a bottom which is at least in certain areas thereof transparent, a build platform, an exposure unit for exposing a material layer formed between the lower side of the build platform and the vat bottom in a locally selective manner, a control unit in order to adapt the relative position of the build platform to the vat bottom after each exposure step for a layer, in order to successively build up the shaped body in the desired shape, and a moveably guided doctor blade arrangement including a drive unit for moving the doctor blade arrangement back and forth underneath the build platform. The doctor blade arrangement comprises two doctor blades spaced apart in movement direction, which doctor blades are moveable at a constant distance to the vat bottom along the bottom. The vat includes vat end walls such that the doctor blade leading in movement direction in each case moves towards one of the vat end walls. Between the two doctor blades a chamber is formed which is open at its lower side, wherein walls of the chamber include at least one opening extending through the wall in movement direction for forming an overflow channel, so that material piling up between the leading doctor blade and the facing vat end wall is pressed through they at least overflow channel into the chamber.

Device for processing photo-polymerizable material for layer-by-layer generation of a shaped body

The invention relates to a method for the construction of a shaped body from photopolymerizable material by using lithography-based generative production (rapid prototyping), in which a layer of liquid photopolymerizable material is defined on a production platform (), the layer is polymerized in an exposure region having a predetermined contour by exposure, a further layer of photopolymerizable material is defined on the polymerized layer, the layer defined last is polymerized by exposure in an exposure region having a predetermined contour for the layer defined last, and the latter two steps are repeated until a shaped body having a predetermined shape has been formed by the sequence of cured layers with contours predetermined layer by layer, wherein ink is applied onto at least one layer inside the predetermined contour, wherein the production platform is suspended moveably and wherein the production platform is brought, after the polymerization of a layer in a processing station for polymerizing a layer, by movement to an ink application station as a further processing station in which ink is applied position-selectively to the layer formed last, after which the production platform is moved again to the processing station for polymerizing a further layer, characterized in that the movement of the production platform between various processing stations is carried out by rotating a drum-shaped carrier which holds the production platform on its circumference, around a horizontal or vertical axis of rotation, wherein the processing stations are disposed distributed around the axis of rotation of the drum shaped carrier.

The invention relates to the use of a composite resin composition comprising The invention also relates to a process for the stereolithographic production of a dental shaped part and the use of the composite resin composition in this process.

Process for producing a dental shaped part by stereolithography

The invention relates to a method for the layered construction of a shaped body made of highly viscous photopolymerizable material.

Method for the layered construction of a shaped body made of highly viscous photopolymerizable material

A method and a device for processing light-polymerizable material for the assembly of a mold, utilizing a lithography-based generative manufacturing technique wherein a layer of a light-polymerizable material, the material being located in at least one trough () having a particularly light-transmissive, horizontal bottom (), is polymerized by illumination on at least one horizontal platform (), the platform having a prespecified geometry and projecting into a trough (), in an illumination field, wherein the platform () is displaced vertically to form a subsequent layer, light-polymerizable material is then added to the most recently formed layer, and repetition of the foregoing steps leads to the layered construction of the mold in the desired form, which arises from the succession of layer geometries. The invention is characterized in that the trough () can be shifted horizontally to a supply position, and the supply device () brings light-polymerizable material at least to an illumination field of the trough bottom (), before the at least one trough () is shifted to an illumination position in which the illumination field is located below the platform () and above the illumination unit (), and illumination is carried out.

The present invention relates to a polymerization-curable composition for the preparation of biodegradable, biocompatible, cross-linked polymers on the basis of polyvinyl alcohol comprising: 5 to 100% by weight of (a) vinyl ester monomer(s) of one of the general formulas (I) to (III): wherein X is oxygen, sulfur, nitrogen, or phosphorus; n is 1 to 1000, at least 20% of the n being &#x2267;2; the Rare selected from hydrogen; straight, branched or cyclic, saturated or unsaturated, n-valent hydrocarbon groups having 1 to 30 carbon atoms, which optionally have heteroatoms and are optionally substituted with one or more substituents selected from &#x2014;OH, &#x2014;COON, &#x2014;CN, &#x2014;CHO, and &#x2550;O, and n-valent radicals of biodegradable, biocompatible oligomers and polymers; m is an integer from 1 to 5; the Rare selected from hydrogen, &#x2014;OH, &#x2550;O, and the options listed for R; and the Rare selected from hydrogen, &#x2014;OH, and the options listed for R; 0 to 50% by weight of ethylenically unsaturated co-monomers; 0 to 10% by weight of (a) polymerization initiator(s); and 0 to 95% by weight of solvent(s).

Composition that can be cured by polymerisation for the production of biodegradable, biocompatible, cross-linkable polymers on the basis of polyvinyl alcohol

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Vienna, Austria

Jürgen Stampfl