Dentsply Sirona Inc.

Sirona Dental Systems Gmbh

Metin Ertugrul

Siegfried Goisser

Ralf Sutter

Thomas Bierbaum

Matthias Rein

Stefan Göbel

Alexander Muhlbeyer

Jan-Paul Schermuly

Jan Paul Gerlach

Alexander MÜHLBEYER

The invention relates to a rotor () having a turbine wheel () driven by propellant (TG) in a turbine housing (), a dental preparation instrument () having such a rotor () and a method () for operating such a preparation instrument (), wherein at least one part of the propellant (TG) flows back to the gas outlet opening () in an inner wall () radially orbiting the turbine wheel () through a return flow channel () after impinging on at least one of the drive blades () of the turbine wheel () counter to the direction of rotation (DR) of the turbine wheel (), the inner wall () in the segment of a circle (KS) comprises at least one return flow channel () extending at least from the gas inlet opening () as far as the gas outlet opening (), which allows at least one part of the propellant (TG) to flow back to the gas outlet opening () through the return flow channel () after impinging on at least one of the drive blades () counter to the direction of rotation (DR) of the turbine wheel (), wherein, in axial direction (AR), the turbine housing () has at least one cross-sectional extension () of a surface between drive blades () and inner wall () as far as the return flow channel ().

Reverse-flow brake for rotors in dental preparation instruments

A dental hand piece or angle piece including a rotating tool, which is driven via a rotating drive element disposed in a housing, wherein the rotating drive element is mounted in the housing by a radial rolling bearing, wherein the rolling bearing comprises an axial abutment surface and the housing comprises an axial countersurface, and wherein the rolling bearing is axially preloaded with respect to the housing by a spring elementand has a coefficient of friction for the static friction of the abutment surface to the countersurface or the abutment surface and the countersurface to the spring element that is at least 0.16 in the lubricated state and at least 0.25 in the unlubricated state.

Dental hand piece or angle piece with a rotating tool

Dental hand piece, comprising a housing and a drive train with a coupling element for a drive, wherein the housing radially surrounds the drive train and wherein the housing has a first and a second housing end, and wherein the housing is held on the drive train on the first and on the second housing end. Between the first housing end and the coupling element is arranged a decoupling element, which is strictly springy or springy and damping in the axial direction, whereas the second housing end is braced rigidly against the drive train and the housing is braced with respect to the coupling element in the axial direction by means of the decoupling element.

Dental hand piece

The invention relates to an adapter for connecting a dental instrument to be operated with compressed gas to a compressor supplying the compressed gas, and to a control unit as well as a treatment unit comprising the adapter, wherein the adapter has at least one first input for the compressed gas of a compressor, a second input for a control signal, an output for connecting to the dental instrument, and a valve between the first input and output that is controllable by the control signal.

Adapter for connecting a compressed gas operated dental instrument to a compressor

The invention relates to a handpiece head () comprising a housing () and a closing cap (), wherein the housing () is releasably connected to the closing cap () by means of a screw connection (). The closing cap () comprises at least one recess () or at least one elevation (), wherein the housing () correspondingly comprises at least one elevation () or at least one recess (). When the closing cap () is screwed in, the elevation () on the housing () engages in the corresponding recess () on the closing cap () or the elevation () on the closing cap () engages in the corresponding recess () on the housing (), so that an inadvertent release of the closing cap from the housing () as a result of vibrations of the handpiece head () is prevented by the engagement.

Handpiece head for a dental handpiece

The invention relates to a clamping device for clamping a cylindrical instrument shank, in particular, a dental instrument, the clamping device including a spring-loaded element for holding the instrument shank, a hollow shaft for transmitting a rotational movement, and a plunger, with the spring-loaded element being designed as a sleeve with a cylindrical wall, a first opening and a second opening; and the wall having cut-outs. The spring-loaded element, the shaft and the plunger have axes of rotation that are arranged coaxially; the shaft protrudes at least partially into the first opening of the spring-loaded element; and the plunger protrudes at least partially into the second opening of the spring-loaded element.

Clamping device for clamping a cylindrical instrument shank

A dental preparation instrument having a pneumatic turbine () with a rotor () for driving a tool (), wherein the rotor (), which is mounted in a turbine chamber () for rotation about an axis of rotation (), is impinged by compressed air from a compressed-air nozzle (). A first radial partition () has an opening () via which an annular space () is in flow connection with an outlet duct ().

Dental preparation instrument with a pneumatic turbine

A dental apparatus that includes a turbine, a rotor, and a disruptive contour. The turbine drives a tool by compressed air. The rotor is arranged in a turbine compartment and rotates about its longitudinal axis. The rotor includes a plurality of blades that extend up to a front side of the rotor. The disruptive contour is at least one protrusion on a wall opposite the front side of the rotor which extends over a height in a direction of the longitudinal axis of the rotor.

Dentists' preparation instrument

A dentists' preparation instrument () comprises a turbine () for driving a tool () using compressed air, and a rotor () that is arranged in a turbine compartment (), rotates about a longitudinal axis (), and has blades () extending to a face () of the rotor (). The turbine compartment () has a discharge port () for the compressed air towards a returning air duct (). Said discharge port () is disposed in such a way that both the face () of the rotor () and parts of the blades () sweep past the discharge port () as the rotor rotates about the longitudinal axis (). For deceleration purposes, the rotor () has a deceleration contour () on the face (), said deceleration contour being formed by projections (), and the turbine compartment () has a deceleration contour chamber () inside which the deceleration contour () is accommodated. The discharge port () in part also extends across the deceleration contour chamber ().

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Rodermark, Germany

Metin Ertugrul