1) What is the Importance of speed in an Endomotor?

Speed refers to the revolutions per minute and ranges from 150-40000 rpm. Cutting efficiency of an Endomotor increases with speed, however, be aware that higher speed can lead to loss of control, loss of tactile sensation, flute distortion and thereby breakage of instruments. It will also result in change in anatomical curvature of canal.

2)  Why auto reverse rotation is a boon?

Instruments are subjected to distinct torque levels during the root canal treatment. If the level of the torque is equal or greater than the deformation torque, the instrument will either deform or separate. Auto reverse rotation enables the motor to stop rotating and reverse the direction when the instrument is subjected to deformation torque value set on the motor.

3) How torque sensors help the instrument?

Torque sensing property of endomotors, monitors the twisting force exerted on the file and allows the auto-reverse rotation when it exceeds the torque limit. This reduces the chances of file breakage inside the canal.

4) Gear system:

Gear system, incorporated within the handpiece, controls the torque depending on the size of the rotary instrument.

5) What are the general classification of motor?

  • First generation without torque control
  • Second generation with torque limiter
  • Third generation with small torque control
  • Fourth generation with Apex locator and torque control

6) Difference between rotary and reciprocation

Rotary or continuous rotation has delivered lesser risk of complications like root perforation and ledge formation. Whereas, reciprocation brings rotary files extended lifespan and reduces the time taken to shape canals. Reciprocating files keeps the canal anatomy untouched and has cutting efficiency as the rotary motion.

7) Programmable memory functions

Endomotor has various number of programmable memory functions depending on the motor generation. It enables the operator to program several parameters such as the rotational direction, speed, torque, gear ratio and others. It varies from 5- 12 programmable memory functions.