A dental turbine drive which is provided with an arrangement to prevent suctioning of particles after deactivation of the drive air into the return air line. To accomplish this, the turbine space is closed during a run-out phase of the rotor except for an outflow channel that is arranged close to the axis of the rotor shaft adjacent the tool side and is connected to a return air channel. The return air channel can discharge directly into the outflow channel at a point spaced from the main portion of the rotor and a valve arrangement may be presented for closing the air opening once the input air has been interrupted.