The files of the Mtwo (M2) system (VDW, Munich, Germany) feature an Sshaped crosssectional design, a positive rake angle with two cutting edges, and increasing pitch length from the tip to the shaft When comparing with other rotary systems has shown more shaping ability and cleaning efficiency in curved root canals (8,Achieving acceptable result by using Mtwo files indicated that this system has cutting efficiency like manual files and could preserve curve of root canals In primary and permanent teeth, we found no significant differences in the cleaning ability of Mtwo rotary files between the apical, middle and coronal thirds of the root canalsIn each of these main subgroups, either the manual instrument (Kfile) or the rotary system (Mtwo) was used to prepare root canals After cleaning the canals and clearing the teeth, dye removal was evaluated with the help of a stereomicroscope In addition, the time needed for root canal preparation was recorded by a chronometer
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