Ivoclar Vivadent Ag

Technische Universitāt Wien

Johannes Patzer

Wolfgang Josef Wachter

Jürgen Stampfl

Christoph Appert

Robert Liska

Gottfried Rohner

Jörg Ebert

Jürgen Rudolf Laubersheimer

Johannes Homa

Volker Rheinberger

Norbert Moszner

Gerald Mitteramskogler

Jürgen Laubersheimer

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

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.

Slip based on a polyreactive binder, polymerization initiator and filler, which contains (A) 5-65 wt.-% polymerizable binder, (B) 0.001-1.0 wt.-% photoinitiator and (C) 35-90 wt.-% surface-modified ceramic and/or glass ceramic particles relative to the overall mass of the slip, and process for the preparation of ceramic mouldings by rapid prototyping processes using the slip.

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Vienna, Austria

Johannes Patzer