There are basically two types of hand pieces, air-driven and electric. Electric hand pieces are much stronger than air-driven due to the fact that a motor is spinning the bur as opposed to air. This allows the doctor to remove decay at a faster pace. This will cut down on the time it takes to complete a procedure.

Electric hand pieces are quieter than traditional air drive handpieces .  They produce less than half as much noise as the air driven.  They also produce less vibration.