This technique was introduced by Roane et al. it involves
1 Placement into the canal and engagement of the file in the dentine by clockwise rotation off not more than 90 degree and light inward pressure
2 Cutting and crushing of the dentine by anticlockwise rotation( around 180 -270 degree) and inward pressure matched to the applied torque in such a way that no inward or outward motion of the file results
3 Repetition of the preceding operation after the file has been placed more deeply into the canal
4 At the appropriate time, removal of the debris by clockwise rotation with outward pulling and cleaning with irrigant.
The superiority of this technique in comparison with the more common procedure of filing by successive inward and outward motions lies in its ability to enlarge curved canals to the required final diameter without transportation of the foramen, ledge formation or perforation.
REF: International Endodontic Journal (1998) 31, 166–172
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