One of the Major Differences Between the Piezoelectric Ultrasonic Instrument

Multiple Choice

One of the major differences between the piezoelectric ultrasonic instrument and the magnetostrictive ultrasonic instrument is which of the following?

A) The purpose of the water that is emitted at the working end
B) The surfaces of the working end that are adapted to the tooth
C) The frequency used
D) The type of stroke employed when activating
E) The power used