Dental device with load-responsive motor control

A method of controlling a motor driven dental handpiece having a motor control for driving a motor for dental treatment comprising:

• applying a tool of the handpiece to a tooth to generate a load,
• applying said load to an electric motor of the handpiece,
• increasing or decreasing a speed of the tool of the handpiece to a controlled output goal corresponding to said load,
• wherein the increasing or decreasing is also according to a sustenance of a new motor current resulting from a change in a motor current above a predetermined hysteresis current threshold, over a predetermined time period, and
• wherein during a period of application of the load to the electric motor, the speed is automatically increased for an increasing load and automatically decreased for a decreasing load without a use of a pedal.