A/D The prebent file is inserted 180' opposite to the actual root canal dilaceration.
B/E As the file is inserted further, it is rotated 180' within the canal; this is indicated by the stopper marking.
C/F/G When the file has reached the working length, the stopper marking will point in the direction of the apical dilaceration.
H Master point radiograph (four root canals).
I Final radiograph of the root canal fillings.
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