Ivoclar Vivadent Ag

Rudolf Jussel

Christian Ritzberger

Gottfried Rohner

Harald Bürke

Jörg Ebert

Walter Pokorny

Frank Rothbrust

Heinrich K Feichtinger

Manuel Schlegel

Philipp Kettner

Johannes Lorünser

Hendrik John

Christian Niedrig

Michael Brotzge

Lorenz Josef Bonderer

Jürgen Rudolf Laubersheimer

Werner Lautenschläger

Markus Pauler

Theresa Sujata Maria Senti

Stefan Lerch

Nadja Cavegn

Heinrich Kappert

Thomas Stampfer

Theresa Senti

Christian Werling

Aleksandar Tubic

Bo Jiang

Buerke Harald

Philip Kettner

Heinrich ProfDrIng Feichtinger

Heinrich Feichtinger

Rohner Gottfried

Fabio Gfeller

Lars Arnold

Katja Ott

Dominik Müller

The present invention relates to a method for comparing three-dimensional dental structures, comprising the steps of acquiring (S) a target data set representing the shape and optical properties of a natural tooth; rendering (S) a digital tooth model () to generate an actual data set representing the shape and optical properties of the digital tooth model; determining (S) a first comparison value from the actual data set; determining (S) a second comparison value from the target data set; and determining (S) a deviation based on the first and second comparison values.

Comparison of color images of three-dimensional dental structures

The invention relates to an arrangement of a furnace and of bulk material of glass particles, said furnace () comprising a pressing punch (), a pressure, distance and/or speed sensor and a control device for controlling a pressing process based on the output signal of the sensor. The sensor detects at least a pressure, position and/or motion parameter of the pressing punch (). The pressing punch () acts on the bulk material of glass particles ()&#x2014;possibly via an interposed ram ()&#x2014;, said glass particles being guided and crystallizable in a press channel (). The trigger criterion for the process control is a change of at least a motion parameter of the pressing punch () upon softening of the bulk material of glass particles () which change is detected by the sensor.

Arrangement of a furnace and of bulk material of glass particles as well as method for operating a furnace

The present invention relates to a method for fabricating a dental restoration, comprising the steps of rendering (S) a first digital tooth model with a first material combination for generating a first actual data set representing the optical properties of the first digital tooth model; determining (S) a first deviation between a target data set and the first actual data set; rendering (S) a second digital tooth model based on a second combination of materials to generate a second actual data set representing the optical properties of the second digital tooth model; determining (S) a second deviation between the target data set and the second actual data set; and fabricating (S) the dental restoration based on the first digital tooth model when the first deviation is less than the second deviation and fabricating the dental restoration based on the second digital tooth model when the second deviation is less than the first deviation.

Method for fabricating a dental restoration

The invention relates to a dental furnace, in particular a high-temperature dental furnace for oxide ceramics such as zirconium dioxide with sintering temperatures of between 1350&#xb0; C. and 1650&#xb0; C., having heating elements () which are intended to give off heating energy to a firing chamber () in the dental furnace (). The heating elements () are configured as electrical resistance heating elements and supported below the firing chamber () each by means of at least one heating element support foot (). The heating elements () extend vertically to the top starting from the heating element support feet () and at the top, end in an arch (), in particular in a semicircular arch or possibly in a pointed arch, without an upper lateral support, in particular not in the region of the arch ().

Dental furnace

A stereolithography apparatus having a build platform and a tray, into which the build platform can be immersed, wherein at the bottom in or on the tray a light-transmissive film is formed or arranged and is elastically deformable, having a light source or energy source underneath the film, the tray can be filled with flowable printing material, a control apparatus controls the movement of the build platform relative to the film and the control apparatus superimposes, during the substantially vertical release movement between a slice of a structure, produced by stereolithography, on the build platform from the film, upon the release movement a substantially horizontal, in particular translational, transverse movement which transverse movement extends at an angle between 60 and 120&#xb0; relative to the release movement and has alternating, in particular reciprocating, movement directions.

Stereolithography apparatus with periodic, transverse movement with an amplitude of .8 to 15 millimeters

A dental treatment device with an energy source is provided which is arranged at least partially in or on a working chamber, comprising a stamp which is movable in relation to the dental treatment device as for the rest and which comprises a receiving plate for dental restoration parts. It is provided that the working chamber has a through-opening at the top, into which the receiving plate () is at least partially movable. Further, a drive is provided for the transfer of the stamp from a working position into a presentation position, and optionally vice versa. A cover () is mounted, in particular hinged, on the dental treatment device as for the rest, by which cover the through-opening () is closable.

Dental treatment device

The invention relates to a single- or multi-unit dental restoration, which consists of a support structure and a veneer, which support structure is in particular made from oxide ceramics by means of additive manufacturing, particularly preferably by means of rapid prototyping, wherein the veneer is produced by pressing a ceramic material, such as a glass ceramic or composite material, which is more translucent than the support structure, characterized in that the veneer fills and/or penetrates recesses of the support structure () configured as a net or frame structure or as a reinforcement, wherein it is particularly provided that the recesses penetrate through the support structure ().

Single- or multi-unit dental restoration, and method of producing the same

The invention shows a material provision device for a stereolithography apparatus to provide print material (), in particular a photopolymer, to be cured, wherein the material provision device () surrounds an in particular limp material cartridge () which receives the print material () on all sides and (UV) light-proof, and the material cartridge () comprises an outlet () via which the print material () may be dispensed and which is received in a connection () or a spout in the material provision device () and is at least partially supported thereon or therein or seals against it.

Material provision device for a stereolithography apparatus

A dental cooling device is provided, comprising a muffle () and a medium () as cooling source. The medium (), in particular a liquid medium (), is stored at least in the outer region of the muffle () and has an evaporation temperature higher than the room temperature. The quantity of medium () is calculated in advance such that the enthalpy of evaporation of the medium is substantially destroyed or consumed when cooling the muffle () to the evaporation temperature.

Dental cooling method and dental cooling device

The invention relates to a method for processing a dental material (), in particular pressing and curing a dental material, by means of&#x2014;a molding insert () that has a pre-pressing area () which adjoins a molding area (), wherein the pre-pressing area () is designed to receive the dental material (), and&#x2014;a pressing furnace with a firing chamber () for receiving the molding insert (). The method has the following steps: &#x2014;introducing the dental material () into the pre-pressing chamber (); &#x2014;heating the firing chamber (), in which the molding insert () is located, pressing the dental material () towards the molding area () using a pressing punch () by applying a force onto the pressing punch () during a first processing phase, wherein the pressing punch () is moved, and the pressing punch speed is detected as a speed profile dependent on the time; and adjusting the firing chamber (), in particular cooling the firing chamber to a second temperature, during a second processing phase starting at a point in time at which the detected speed profile matches a first speed profile without reducing the force applied to the pressing punch ().

Method for processing a dental material and a dental furnace

The invention relates to a dental furnace, in particular a high-temperature dental furnace for oxide ceramics such as zirconium dioxide having sintering temperatures of between 1300 and 1850&#xb0; C., comprising a heating element () which is intended to give off heating energy to the firing chamber. It is provided that the heating element () comprises at least two heating element sections () adjoining one another at a transition area () which is not current-carrying and/or which extends away laterally, that the transition area () is supported on a position, in particular on the free end, spaced apart from the electrical connections () on the dental furnace and carries at least the two adjoining parts of heating element sections ().

Dental furnace and process for operating a dental furnace

A dental furnace having closed or closeable firing chamber (), which is surrounded by thermal insulation () and which comprises at least one inlet terminal () and at least one outlet terminal (). Via said two terminals, a gas, especially air, may be passed through the firing chamber () and/or may be discharged from the firing chamber (), wherein a vacuum source () is provided, which is in direct or indirect communication with the outlet terminal () and via which the outlet terminal () may be set under vacuum pressure. At the outlet terminal (), an especially T-shaped or Y-shaped connector () is attached. The connector () comprises two entrance ports () and an exit (), wherein the exit () is in communication with the vacuum source () and a first entrance port is in communication with the firing chamber (), and especially is flange-mounted at the outlet terminal () thereof, and a second entrance port () is in communication with ambient air.

Dental furnace as well as method for operating a dental furnace

This invention relates to a device for drying at least one object containing a liquid, in particular a dental restoration object (). Said device comprises a means for generating thermal energy acting upon the object and sufficient for increasing the temperature of the object to the boiling point. Moreover, the device includes an impingement area for impinging on the object with thermal energy and a control device () that is characterized by the fact that a temperature detection element () of the device () measures the temperature of the object (), and upon reaching a trigger temperature that is at the boiling temperature, somewhat below or somewhat above thereof, emits a signal to the control device.

The invention shows a dental press furnace comprising a pressing punch () which acts on a green product () made of in particular a ceramic mass&#x2014;possibly by means of an interposed ram ()&#x2014;, the green product () being guided in a press channel () which is configured in a muffle (), and a pressure, distance and/or speed sensor detecting at least one motion parameter of the pressing punch (), and comprising a control device for controlling the pressing process based on the output signal of the sensor, the trigger criterion for the start of the pressing process being a change of at least one motion parameter of the pressing punch upon heating and/or softening of the green product which change is detected by means of the sensor.

Growing community of inventors

Feldkirch-Gisingen, Austria

Rudolf Jussel