All of the Following Are True About the Adaptation of Working

Multiple Choice

All of the following are true about the adaptation of working ends of ultrasonic instruments except:

A) the terminal 2 to 4 mm of the insert or tip should be adapted to the deposit.
B) the appropriate surfaces of the working end should be adapted.
C) the angle of the working end to the tooth should be maintained around 15 degrees.
D) adaptation should star with moderate pressure being applied.
E) activation should occur after correct adaptation to the deposit.