17
Problem
Possible cause
Solution
Is there vital inflamed
pulp tissue left inside
the canal?
If a large amount of vital inflamed
pulp tissue is left inside the canal,
particularly in wide canals such as
upper incisors and canines, it may
cause incorrect measurements.
Is the file touching
metal prosthesis or
filling?
Touching a metal prosthesis of
filling with the file may create a
conductive path outside the canal
and cause incorrect
measurements (
“OVER”
indication, unstable readings, etc.)
Are proximal surfaces
infected with caries?
Deep caries may create a
conductive path outside the canal
and cause incorrect
measurements (
“OVER”
indication, unstable readings, etc.)
Are there external
resorption or is the
tooth fractured?
The canal length indicator may
jump to “OVER” position when it
reaches a resorption area or a
fractured root tooth.
Does a broken crown
cause incorrect
measurements?
Build up an insulating barrier to
isolate the file from the crown.
Is there a lesion at
the apex?
A chronic lesion can destroy the
apical foramen through resorption
and cause incorrect
measurements.
Is the file clip holder
broken or dirty?
Replace or clean the file clip.
If the problem persists, please contact your supplier.
