In balanced force technique used for canal preparation:
Correct Answer: Apical force is applied
Description: Balanced force concept uses Flex-R file and is described as "Positioning and pre-loading an instrument through a clockwise rotation and then shaping the canal with a counterclockwise rotation".
Many authors discovered that greater risk of instrument damage was associated with clockwise movement.
For best results, preparation is completed in a step-down approach.
After mechanical shaping of coronal and middle thirds with Gates-Glidden drill, insertion of the instrument is done with a quarter turn clockwise rotation while slight apical pressure is applied.
Cutting is accomplished by making a "Counterclockwise rotation".
The counter-clockwise rotation and apical pressure act together to enlarge and shape the canal to the diameter of the instrument.
The clockwise rotation should not exceed 90° while the counterclockwise motion must be 120° degrees or greater.
Category:
Dental
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