Abstract: The method for producing a three-dimensional layered object comprising the steps of: depositing, onto a support plane of a cooled platform, a first liquid which solidifies forming a first containing layer H1; depositing, onto the first containing layer H1, a second liquid which solidifies forming a first structural layer G2 of the three-dimensional object; the structural layer G2 is deposited in an area that has contours corresponding to the contours of a first section of the digital model of the three-dimensional object; forming a second containing layer H2 which completely surrounds the structural layer G2 in the directions X and Y; repeating the previous steps for all sections n of the three-dimensional model, thus producing an object formed by n superimposed structural layers G2, G3, . . . Gi, . . . Gn which is incorporated at the bottom and on the sides along the directions X and Y by n+1 containing layers H1, H2, . . . Hi, . . .

Abstract: System for stereolithographic printing comprising a support structure which defines a reference plane on which a three-dimensional object is formed starting from at least one material sensitive to the basic radiation adapted to be solidified when irradiated by a radiation, means for generating such radiation in the direction of such reference plane, a modelling plate which supports and to which the three-dimensional object being formed is constrained, which is able to move the solidified layer according to a direction substantially perpendicular to such plane, so as to allow the last solidified layer of the object to be arranged in a position adjacent to said plane, means for forming at least one layer of such radiation-sensitive material on such reference plane including at least a portion of a film that can be moved on said plane from one end to the other of said plane and a first feeder of a first radiation-sensitive material on said portion of film.

Abstract: A system for manufacturing a dental prosthesis includes: a computer with tooth optical property data, which combines the data with a layered numerical representation of the dental prosthesis to link numerical optical properties values representative of the tooth optical properties to each layer; and a computer-controlled stereolithography machine including: a container containing a light sensitive liquid substance; a first tank containing a first light sensitive material; a second tank containing a modifier material having optical properties different from the first light sensitive material; a feeding device for delivering the first light sensitive material and/or of the modifier materials toward the container; and an irradiation device for selective solidification of the light sensitive liquid substance.

Abstract: Method for manufacturing dental prostheses, comprising the following operations: defining a layered numerical representation of a dental prosthesis (11); for a first layer of the numerical representation, prepare a corresponding layer of a light sensitive liquid substance (6); selectively solidify the layer of liquid substance (6) to obtain a first sheet (7) having a geometry corresponding to the geometry of the first layer of the numerical representation; repeat the operations of preparing a layer of liquid substance (6) and selectively solidify the layer of liquid substance (6) for each subsequent layer of the numerical representation to obtain corresponding sheets (7); cause the mutual adhesion between said sheets (7); modify the composition of the liquid substance (6) after having solidified one of the sheets (7) and before solidifying the subsequent sheet (7), so as to modify one or more optical properties of the liquid substance (6).

Abstract: A multi-station stereolithographic group, includes: support and movement apparatus for a modelling plate with respect to a fixed base facing the modelling plate, the fixed base including at least two work stations positioned in respective areas able to be reached by the modelling plate moved by the support and movement apparatus. Such a fixed base includes at least three work stations: at least one first station for forming an object, at least one second station for washing a formed object, at least one third station for stabilising a formed object.

Abstract: A stereolithography machine includes: a tank with a bottom; a supporting unit associated with moving means configured to move it according to a direction of movement which is orthogonal to the bottom; a modelling plate having a modelling surface facing the bottom in order to support a three-dimensional object; a coupling unit suited to removably connect the modelling plate to the supporting unit and comprising a housing and a spherical body revolvingly arranged in the housing; releasable clamping means suited to be operated in such a way as to press the housing and the spherical body against each other so as to make them integral with each other and to make the modelling plate integral with the supporting unit.

Abstract: A stereolithography machine includes a support structure arranged resting on a substantially horizontal support plane having a reference direction, a tank, having a bottom, coupled with the support structure, a support group coupled with the support structure for the movement above the tank of a modelling plate so that the modelling surface of the modelling plate faces the bottom in a substantially parallel position. The tank includes a recirculation circuit configured to move a photosensitive liquid substance contained in the tank from a first end to a second end of the tank, both defined along the reference direction, to carry out inside the tank a continuous recirculation of the resin that, by gravity, flows out from the first end at a greater height, to the second end at a lower height, and the same resin is returned by the recirculation circuit from the second end to the first end.

Abstract: The invention is a cartridge (1, 100) for stereolithography machines (200), which comprises a supporting structure (3) provided with connection means (10) suited to removably connect it to the stereolithography machine (200), a first reservoir (5) suited to contain a material (M1, M2) and provided with a first duct (8) and with a delivery mouth (81) which are suited to place it in communication with a container (4), a feeding unit (7) suited to feed the material (M1, M2) from the first reservoir (5) to the container (4), shutter means (9) suited to close the delivery mouth (81) of the first duct (8), and a second reservoir (12) suited to contain the material (M1, M2). The cartridge (1, 100) furthermore comprises a second duct (13) interposed between the first reservoir (5) and the second reservoir (12) in such a way as to place them in communication with each other.

Abstract: The present invention relates to a method to form a three-dimensional object including a first and a second component (01, 02) from a first and a second solidifiable materials (5a, 5b) being capable of solidifying upon impingement thereon of electromagnetic radiation, the method comprising: o providing a main digital image of the three dimensional object; o introducing said first and said second solidifiable material (5a, 5b) in a first and a second chamber (2a, 2b), respectively; o elaborating the main digital image dividing it in a first digital image corresponding to the first component and a second digital image corresponding to the second component; o associating the first component to the first chamber and the second component to the second chamber; o irradiating by means of an electromagnetic source (6) a layer of said first and/or said second solidifiable material (5a, 5b), according to a given pattern, in order to selectively solidify the layer of the first and/or the second solidifiable material; o

Abstract: The invention refers to a liquid photocurable resin composition for stereolithography, comprising (i) at least one radical polymerizable compound (A) represented by the following general formula (I): R4O—CO—NH—R2—NH—CO—O—R1—O—CO—NH—R3—NH—CO—OR4 (I), wherein R1 is a linear or branched polytetramethylene glycol residue having an average molecular weight from 200 to 3,000 g/mol; R2 is a diisocyanate compound residue; R3 is a diisocyanate compound residue being the same as or different from R2; and R4 is selected from AcrO—CH2—CH2—, (AcrO—CH2)2CH—, (AcrO—CH2)3C—CH2—, AcrO—CH2—CHCH3—, AcrO—CH2—CHC2H5— and (AcrO—CH2)2C(C2H5)CH2—, preferably from AcrO—CH2—CH2— and (AcrO—CH2)2CH—, more preferably is AcrO—CH2—CH2—; wherein Acr is CH2?C(R)—CO— and R is a hydrogen atom or a methyl group; (ii) at least one radically polymerizable organic compound (B) different from compound (A); and (iii) a photosensitive radical polymerization initiator (C), wherein the content of said radical polymerizable compound (A) varies from 5% t

Abstract: An investment casting model for the creation of a mold for investment casting of a plurality of objects, the investment casting model being realized in solidifiable resin, and includes: a base defining a Z axis; a plurality of wire-like elements all extending from the base, the wire-like elements intersecting each other to form a plurality of simple closed curves, which form a net around the Z axis. At least two of the simple closed curves of the plurality are identical to each other and the net includes: at least a first and a second sets of simple closed curves, each set forming a net sub-structure around the Z axis, the second set being adjacent to the first set along the Z axis; a plurality of object models; and a plurality of connecting branches joining the plurality of object models to the wire-like elements forming the net.

Abstract: The invention is a cartridge (1, 100) for stereolithography machines (200), which comprises a supporting structure (3) provided with connection means (10) suited to removably connect it to the stereolithography machine (200), a first reservoir (5) suited to contain a material (M1, M2) and provided with a first duct (8) and with a delivery mouth (81) which are suited to place it in communication with a container (4), a feeding unit (7) suited to feed the material (M1, M2) from the first reservoir (5) to the container (4), shutter means (9) suited to close the delivery mouth (81) of the first duct (8), and a second reservoir (12) suited to contain the material (M1, M2). The cartridge (1, 100) furthermore comprises a second duct (13) interposed between the first reservoir (5) and the second reservoir (12) in such a way as to place them in communication with each other.

Abstract: A cartridge for a stereolithographic machine, includes a body, which in turn, includes a container, delimited by walls, having a bottom, and an opposite access opening allowing access inside the container, inlet and outlet mouths for a photopolymerisable material, at least one tank for same. The tank includes a transit opening for a photopolymerisable material and an air passage opening communicating with the environment; and includes: circulation means to circulate the photopolymerisable material between the outlet mouth and the inlet mouth of the container. Between the circulation means and the inlet and outlet mouths, and between the circulation means and the transit and air passage openings, valve means are interposed, configured to alternatively allow various circulation configurations of the cartridge, either preventing or allowing passage of photopolymerisable material between the container and the tank; or allowing the passage of material between the outlet and inlet mouths of the same container.

Abstract: A cartridge for a stereolithography machine, including a container provided with an access opening, a reservoir for containing a base material, liquid or pasty, suited to be solidified through exposure to a predefined radiation, said reservoir being permanently associated with said container, feeding means suited to feed said base material from said reservoir towards said container, characterized in that the bottom of said container is at least partially transparent to said predefined radiation and is situated opposite said access opening.

Abstract: The invention is a stereolithography method for the production of a three-dimensional object (10) through the superimposition of a succession of layers (1-5) obtained by solidifying a liquid material through exposure to predefined radiation (6), comprising the following operations: defining a geometric representation of the layers (1, 2, 3, 4, 5); selecting one or more layers (2) that precede a reference layer (4) in the succession; defining a mask area (9) corresponding to the logical conjunction of the geometric representations of the reference layer (4) and of the selected layers (2) reproduced on the plane of the reference layer (4); exposing the liquid material to the predefined radiation (6) in the mask area (9).

Abstract: A stereolithography machine comprising: a tank provided with a bottom; a modelling plate facing the bottom; a moving unit suited to move the modelling plate according to a direction of movement that is orthogonal to the bottom; a coupling unit between the modelling plate and the moving unit, comprising a first coupling member integral with the moving unit and a second coupling member integral with the modelling plate and movable with respect to the first coupling member according to the direction of movement; tightening means suited to be operated in such a way as to tighten the coupling members against each other according to a tightening direction that is orthogonal to the direction of movement, in order to lock the mutual movement of the coupling members.

Abstract: The invention concerns a method for producing a three-dimensional object, in particular an artificial tooth, by stereolithography wherein a liquid photocurable resin composition is cured by light. Said photocurable resin composition contains, based on the total weight of the photocurable resin composition, (i) from 90 to 99.9% by weight of a radical polymerizable organic compound (A) selected from radical polymerizable monomers, oligomers, pre-polymers and mixtures thereof; and (ii) from 0.1 to 10% by weight of a photosensitive radical polymerization initiator (B). Said radical polymerizable organic compound (A) comprises, based on the weight of the radical polymerizable organic compound (A), from 0.

Abstract: A stereolithography machine (1, 100, 200) that comprises a support structure (1a) arranged resting on a substantially horizontal support plane (?) having a reference direction (X), a tank (2) coupled with the support structure (1a) and provided with a bottom (2a), a support group (5) coupled with the support structure (1a) for the movement above the tank (2) of a modelling plate (3) so that the modelling surface (3a) of such a modelling plate (3) faces, substantially in a parallel position, the bottom (2a).

Abstract: Method for removing resin residues from a model created by three-dimensional 3D printing, including the steps of creating a three-dimensional model through three-dimensional 3D printing, inserting the model into a container (10), introducing a solvent (24) into the container (10) and moving the container (10) with the solvent (24) and the model by means of repeated linear movements. The application further relates to a container (10) for removing resin residues from a model created through three-dimensional 3D printing, the container (10) including a tank (20) adapted to contain a solvent (24), a cover (30) adapted to close the tank (20) and means (38) for sealing the cover (30) to the tank (20), wherein the cover (30) includes or is a base (32) of three-dimensional 3D printer, the base (32) including one or more anchoring elements (34) for a three-dimensional model.

Abstract: A light-curing oven (1; 100) comprising: a light-curing chamber (2) configured to contain one or more objects (A) to be light-cured; a source (3) of light-curing rays arranged inside the light-curing chamber (2); a vacuum pump (4) with a suction duct (5) communicating with the light-curing chamber (2) and a motorized structure (6; 106) for moving the objects (A) during the light-curing process. The motorized structure (6; 106) may comprise an electric motor (7; 107) with a drive shaft (8) mechanically associated with a support plate (9) for supporting the objects (A) to be light-cured. The electric motor (7; 107) and the drive shaft (8) being configured in such a way that they define for the objects (A) a horizontal rotation axis (X). The motorized structure (6; 106) may also comprise piezoelectric transducers (10; 110) for making the objects (A) vibrate during their rotation.