Abstract: The actuator incorporates a foot subassembly for selectively controlling either any movement of the chair or a use of a handpiece, comprises a main board subassembly for a) controlling the movements and positions of the chair and for supplying power to a foot subassembly for selectively controlling; and/or b) converting for further transmitting a linear voltage existing in the foot subassembly for selectively controlling, from analog to digital values; a control subassembly for a) activating the handpiece; b) controlling, via a touchpad, the movements and other functional features of the chair; and c) monitoring for displaying all activities of the chair; air valve subassembly for regulating a quantity of air that passes through it and, hence, a pressure supplied to the handpiece via a solenoid valve; and a display unit for viewing the status and activities of the chair.