Dentsply Sirona Inc.

Peter Burger

Oliver Nowarra

Hans-Christian Schneider

A computer-implemented method of planning of the shapes of free-form tool paths (P) for simultaneous two-sided machining of a dental restoration () having an individual free-form target geometry from a workpiece () by using a dental tool machine () having at least two tool spindles each having at least one tool () arranged on a different side of the workpiece () which is simultaneously movable along an axis (y) relative to the tools () thereby imposing a kinematic axis coupling. The method includes a step of determining transformations (T', T″) of the target geometry by which the kinematic axis coupling is converted into a common coupling parameter for both tools (); and a step of generating dependent on these transformations (T′, T″) the shapes of the free-form tool paths (P) in which the common coupling parameter is identical in time for all participating tool spindles that are driven simultaneously.

Method of planning free-form tool paths for simultaneous two-sided machining with kinematic axis coupling

A device for separating a deep-drawn jaw-spanning dental apparatus such as an aligner or a bite splint of thermoform film that includes: a separating element for thermally separating the deep-drawn thermoform film and simultaneously refining the separated deep-drawn thermoform film; a heating means for regulating the heating of the separating element so as to increase the temperature of the thermoform film substantially to at least its glass temperature; a support for supporting the deep-drawn thermoform film relatively movable with respect to the separating element; a moving mechanism for moving the separating element along a separation contour of the deep-drawn jaw-spanning dental apparatus relative to the support; and a control unit adapted to control the heating means and the moving mechanism based on the separation contour.

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Bensheim, Germany

Peter Burger