In a dental apparatus, in which a number of instruments (19 to 22) are connected to a common control circuit (23) which is further connected with a common operator unit (17) having a control member, which is planar movable out of a home position, auxiliary functions related to the instrument operation such as control of coolant composition and energization of an air blow may be energized by the means of the common operator unit (17) by actuating the control member thereof with a movement different from the instrument energizing movement. The energizing movement for an auxiliary function may have another direction than the instrument energizing movement, for example perpendicular thereto in the home position of the control member. In an embodiment in which a certain minimum duration is prescribed for the instrument energizing movement an auxiliary function may be carried out by a movement of shorter duration. The two possibilites may be combined so that also in case of a different direction related to the instrument energizing movement a discrimination may be made between actuation of auxiliary functions of a shorter or longer duration for the purpose for example of stepwise conrol of an auxiliary function.
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