Root canal shaping



Reaming action
Rotation clockwise and contraclockwise – penetration in to the root canal


Filing
The file is in action during pull motion


Circumferential filing
The file is in contact with root canal wall  - filing around
Good for oval root canals

Balanced force technique
K-File (and their flexibe varieties)
Insertion – clockwise motion (90 °- 180°)
Pressure forward – contraclockwise motion(270°)
Pulling out – clockwise motion (180°)
Safe for curved root canals