a) H file
b) Reamers
c) K file
d) Endo box
The correct answer is C. K file
Ultrasonic and sonic instruments are used for cleaning and shaping root canals.
The ultrasonic instrument contains a magentostrictive hand piece which hold a K-file or diamond file. It is operated at 20000 - 25000/sec.
The sonic instruments operate at 1500 - 6500 cycles/min (25-110/sec). Ultrasonic system uses sodium hypochlorite as irrigant, whereas the sonic system uses water as an irrigant.
CLICK HERE FOR MORE MCQs
No comments:
Post a Comment
Add Your Comments or Feedback Here