Sirona Dental Systems Gmbh

Dentsply Sirona Inc.

Franz Basler

Peter Fornoff

Joachim Pfeiffer

Thomas Hasenzahl

Bernd Rothenberger

Christian Schmidt

Volker Wedler

Axel Schwotzer

Hans-Christian Schneider

Daniel Weiss

David Figge

Siegfried Gleditzsch

Stefan Hehn

Thomas Michalica

Gerd Helmreich

Daniel Weiß

A method of machining at least one dental restoration () from a workpiece () using one or more dental took (), including a step of defining, a target contour () of the dental restoration (); also including a step of predicting the deflection of the dental tool () during pre-machining through a model based on one or more machining parameters; a step of determining based on the prediction step one or more primary locations () at which the target contour () would have been damaged during pre-machining; a step of modifying the target contour () or the corresponding machining path by adding an oversize of material () substantially only at the primary locations () for preventing damage; and a step of pre-machining the workpiece () based on the modified target contour () or the corresponding modified machining path.

Method of machining a dental restoration with reduced contour falsification

The present invention relates to a stereolithography apparatus for generating a three-dimensional object, comprising: an optical unit for projecting an image towards the photocurable substance for hardening the photocurable substance deposited in the focus layer; a control unit, characterized by further comprising: a detection unit which comprises: a detection means movably arranged in a detection region for detecting during the generation process or in a generation-pause the image projected by the optical unit and for outputting a detection signal; and a first driving means for moving the detection means into or out of the detection region, wherein the optical unit comprises: a second driving means linked to the optical unit for moving the focus layer into or out of the detection region, wherein the control unit adjusts the optical unit and/or modifies the image to be projected based on the signal indicative of the detected image.

Stereolithography apparatus having a detection unit for optical adjustment and image modification

A method for producing a dental shaped part includes checking an outer contour of a tool of machining equipment, using least one gauge provided on a blank formed from a tooth restoration material from which a dental shaped part is to be machined using the machining equipment. The method also includes machining the dental shaped part from the blank using the tool of the machining equipment, when the outer contour of the tool corresponds to the at least one gauge provided on the blank.

Method for producing a dental shaped part

A machining device for a workpiece wherein a first feed axis extends through a workpiece holder, a first machining tool is disposed on a first side of the feed axis, and a second machining tool is disposed on a side of the feed axis opposing the first side. Between a first feed axis and perpendicular to a second feed axis, at least one machining tools has a predetermined fixed angular offset.

Device for fabricating dental prosthetics and method

A blank and method for the production of dental shaped bodies in machining equipment having at least two tools located in the machining chamber of the machining equipment, including a corpus of tooth restoration material, from which the shaped body can be carved by means of at least one of at least two tools by material removal. The blank exhibits at least two gages, each of which is in the form of a recess, the geometry of which is such that the tool selected for the cutting operation can be recognized by means of at least one of the gages by reference to its outer contour, the at least two gages being disposed on the blank in such a way that they can be simultaneously engaged by the at least tools when the blank is clamped in the machining equipment for carving purposes.

System for producing a dental-shaped body

Disclosed is a machining device, particularly for producing tooth replacement parts or models thereof, comprising a workpiece holder and at least one machining tool which is disposed in a machining space for a workpiece that is mounted therein. The feeding axis for the workpiece into the machining space extends at an angle relative to the horizontal.

Machining device, particularly for the production of tooth replacement parts or models thereof

In a method for processing a blank (), in which the blank () can be densely sintered with shrinkage following machining and machining of the blank () is carried out in a machining device () allowing for an individual scale-up factor (F) relevant to the blank () for compensating for the shrinkage occurring during dense sintering, a linear measurement of the blank () is performed in one or more of the dimensions length, width, and height for determining the scale-up factor (F), wherein the measured linear measure () bears a known relationship to the scale-up factor (F), the type of blank () being known. Linear measurement of the blank () can be carried out in the machining device ().

Method for machining a blank having an individual scale-up factor and blank therefor

The invention relates to a blank for producing dental shaped parts, comprising a blank body () made of tooth restoration material, from which the shaped part can be machined using a tool () for removing material. The aim of the invention is to enable a reliable verification or recognition of the tool fitting or of the type and state of wear of the used tool of a machine tool for the blank. To this end, the blank has at least one gauge (), whose dimensions are such that the tool present for the machining can be identified by the gauge on the basis of its outer contour. The invention also relates to a method for producing dental shaped parts with a blank body made of tooth restoration material, from which the entire shaped part can be machined in a machining device by a tool for removing material. In order to enable a reliable verification or recognition of the tool fitting or of the type and state of wear of the used tool of a machine tool for the blank, the tool selected for the machining is, before its use, verified with regard to the outer contour thereof by using at least one gauge that is placed upon the blank.

Blank for producing dental shaped parts and method for producing the shaped part

The invention relates to a machining device () comprising a workpiece () and at least one machining tool () and a measuring device () and a seat () for the workpiece () to be machined. The workpiece () has a reference surface () that is disposed on the workpiece () and interacts with the machining device () in such a manner that a contour can be produced on this reference surface () using the machining tool () and that the contour () can be detected by the measuring device () after machining. The method for controlling a machining device () comprises the following steps: introducing a contour () into the workpiece () to be machined in the longitudinal direction of advance of the machining tool (); measuring the contour () in the workpiece () produced by machining; adjusting the machining plan while taking into consideration the determined tool geometry.

Machining device comprising a measuring device for a model

Blank for the production of a dental shaped body and method of producing said shaped body

Machine tool

The invention relates to a measuring device comprising elements for measuring models for producing dental fittings by generating a three-dimensional data record as a model for the three-dimensional machining of a workpiece. The measuring elements are configured in such a way that they can also detect an identification comprising information about the workpiece. The invention also relates to a machining device for producing dental fittings from a workpiece. The device comprises a receiving device for the workpiece, an identification comprising information about the workpiece being applied to the workpiece or workpiece holder. In addition, elements for detecting the identification of the workpiece that is held in the receiving device are provided and a single measuring device is used to measure the model and to detect the identification.

Measuring device for a model and machining device equipped with the same

A tool for use in machining equipment for machining a item from a workpiece via longitudinal and transverse movement includes stepped regions having different diameters, each provided with a lateral surface for transverse lateral machining and a front surface for longitudinal feed machining, the tool diameters in the stepped regions decreasing toward the forward face of the tool.

Method, tool, and matching equipment for producing dental prosthetic items

The current positioning data of a machining tool with regard to a reference surface of a workpiece or of a body connected to the workpiece, is determined. The tool and the workpiece to be machined are relatively moveable toward and away from one another, and the rotary speed of a drive motor for the tool is set to a starting rotary speed which is so low that, when the tool comes into contact with the reference surface, its rotary speed is measurably reduced, the reference surface is moved past the tool before the tool is in contact and while the tool is in contact. As a result, the braking moments in the bearings are increased, and the drive motor comes to a stop quicker.

Method of determining current position data of a machining tool and apparatus therefor

An apparatus for recording medical objects, in particular for recording models of prepared teeth, comprising a position-sensitive sensor ( ), which is movable in the projection direction, with a projection unit and a receiving unit ( - - ), and with a certain triangulation angle (&agr;) located between the projection path of the rays ( ) of the projection unit ( - ) and the observation path of the rays ( ) of the receiving unit ( - ), and with the projection path of the rays ( ) aligned parallel to the direction of movement of the sensor ( ), is realized for the accurate recording action of edges and steep surfaces of the type that occur in tooth cavities with a triangulation angle (&agr;) that is smaller than 10&deg;, preferably smaller than 5&deg;.

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Laudenbach, Germany

Franz Basler