Abstract: Disclosed is a tool with cutting surfaces on the sides, end and tip that is inserted into a handpiece or milling machine. It is used according to a specific technique disclosed herein to mill precision surfaces in dental prostheses that are retained by screws to dental implants, abutments or replicas. The invention mills all types of dental implant prostheses that use a screw for retention. The milling tool of this invention allows the screw to pass through the screw access opening in the prosthesis and fit flush against the screw seat in the prosthesis, leaving space between the axial surfaces of the head of the screw and the screw access channel of the restoration. It also mills the small opening through the prosthesis through which the shank of the screw passes, so there is no contact between the prosthesis and the shank of the screw.