11
5.4.13. Reaching the apical foramen (0.0) is indicated by a red color segment inside
the root canal image (Fig. 10) and a constant audio tone. Determine the
electronically obtained length using an endodontic ruler. To establish the
working length, subtract 0.5 - 1.0mm from the electronic length.
The red OVER indication accompanied by frequent beeps indicates that the file
tip have progressed beyond the foramen into the periapical region -
‘Foramen
over-
instrumentation’ (Fig. 11).
Fig. 11
OVER (Red)
Fig. 10
Foramen (red)
(Red)
