Retreatment canal which was filled
with gutta-percha
The gutta-percha must be completely
removed to eliminate its insulation, then
pass a small file all the way through the
apical foramen and then put a little saline
in the canal, but do not let it overflow the
canal opening.
Crown or metal prosthesis that
touches gingival tissue
Accurate measurement cannot be
obtained if the file touches a mental
prosthesis that is touching gingival
tissue. In this case, widen the opening at
the top of the crown so that the file will
not touch the mental prosthesis before
taking a measurement.
Cutting debris on tooth Pulp inside
canal
Remove all cutting debris on the tooth.
Remove all the pulp inside the canal.
Otherwise an accurate measurement
cannot be obtained.
Caries touching the gums
In this case, electrical leakage through
the caries infected area to the gums are
impossible to obtain an accurate
measurement.
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