Abstract: A rotary sonotrode comprises a rotary body that has a working surface and that is rotatably supported about its longitudinal axis in at least one rotary bearing. A vibration damper is provided between the rotary bearing and the rotary body.

Abstract: A plug-on brush device for a toothbrush handpiece, in particular for an electrical toothbrush handpiece, with an application unit including a head section with a brush head, a plug-on section and a neck section that is arranged between the head section and the plug-on section, and with an interface accommodation unit which is configured to receive at least one interface of a toothbrush handpiece, wherein the interface accommodation unit is realized separately and the plug-on section of the application unit includes a receiving region for receiving the interface accommodation unit at least substantially completely in a loss-proof manner.

Abstract: The invention relates to an ultrasonic oscillating unit that comprises a cylindrical base body having a center axis and a jacket surface into which a plurality of slits are introduced that extend obliquely to the center axis in a side view of the jacket surface.

Abstract: A control device (7) for a system controlled by a controller with an evaluation unit (9) and at least one acquisition unit (17a, 17b) that is connected to the evaluation unit (9). Depending on input values that are input in the acquisition unit (17a, 17b), an operating mode selection can be performed and/or an access authorization can be granted. Output values generated in this manner can be output to the controller via an output stage (8).

Abstract: The invention relates to an ultrasonic oscillating unit that comprises a cylindrical base body having a center axis and a jacket surface into which a plurality of slits are introduced that extend obliquely to the center axis in a side view of the jacket surface.