Abstract: The invention relates to: an apparatus (1) for the post-cleaning of 3D objects (90), which are printed from a light-curing resin formulation and comprise uncured residues of the resin formulation which adhere to the surface and have non-translucent and insoluble particles; and the use of a corresponding apparatus. The apparatus (1) comprises a cleaning chamber (2), which can be filled with a liquid cleaning agent (20) and has an agitator (5), for receiving the 3D object (90) to be cleaned, wherein a contamination detector (8), which is connected to a control unit (11) and determines the optical density of the cleaning agent (20), is provided for checking the remaining cleaning capacity of the cleaning agent (20), wherein the contamination detector (8) is located in an area kept free of non-translucent and insoluble particles above a predefined size in the cleaning agent (20). The determined optical density is used to determine the cleaning capacity of the cleaning agent (20).

Abstract: The invention relates to a method for the post-treatment of 3D objects (10) printed from a light-curing resin formulation. A 3D object (10) removed from a 3D printer is post-treated according to the following steps: a) exposing the surface (11) of the 3D object (10) to a post-treatment liquid (16) comprising a light-curing resin formulation for a prescribed exposure time, wherein the post-treatment liquid (16) and the exposure time are chosen such that the post-treatment liquid (16) can penetrate into a crack (12) or a pore (13) on the surface (11) of the 3D object within the exposure time as a result of capillarity; b) removing the post-treatment liquid (16) remaining on the surface of the 3D object (10); and c) irradiating the 3D object (10) with light for post-curing the light-curing resin formulation used for the printing of the 3D object (10) and curing the post-treatment liquid (16) that has penetrated into cracks (12) and/or pores (13) on the surface (11) of the 3D object (10).

Abstract: The invention relates to: an apparatus (1) for the post-cleaning of 3D objects (90), which are printed from a light-curing resin formulation and comprise uncured residues of the resin formulation which adhere to the surface and have non-translucent and insoluble particles; and the use of a corresponding apparatus. The apparatus (1) comprises a cleaning chamber (2), which can be filled with a liquid cleaning agent (20) and has an agitator (5), for receiving the 3D object (90) to be cleaned, wherein a contamination detector (8), which is connected to a control unit (11) and determines the optical density of the cleaning agent (20), is provided for checking the remaining cleaning capacity of the cleaning agent (20), wherein the contamination detector (8) is located in an area kept free of non-translucent and insoluble particles above a predefined size in the cleaning agent (20). The determined optical density is used to determine the cleaning capacity of the cleaning agent (20).

Abstract: The invention relates to the use of flowable, photopolymerizable composite resin compositions that comprise a nanoscale organic surface-modified filler for stereolithographically producing a shaped dental part and to a method for producing corresponding shaped dental parts. The method according to the invention is particularly simple, fast, reliable and cost-effective. It allows improved shaped dental parts to be produced, in particular improved bridges and crowns.

Abstract: The application relates to a 3D printer (1) comprising a flat base panel (4) and an exposure element (10) which is arranged opposite and parallel to the base panel (4), the distance between the base panel (4) and the exposure element (10) being adjustable with the aid of a drive unit (6), and the base panel (4) and/or the exposure element (10) being arranged in a reservoir (3) filled with resin (2) such that the region bordering the base panel (4) between the base panel (4) and the exposure element (10) is occupied by the resin (2) in the reservoir (3). According to the invention, the exposure element (10) is formed as a two-dimensional matrix of quantum dot light-emitting diodes (11) which are situated closely next to one another and can be activated individually.