19
Problems
Possible causes
Solutions
Display not
steady while
measuring: the
measurement
result is
rather longer
or shorter;
numerical
display irregular.
There is still pulp in the root canal
If there is much pulp left in the root
canal, the root canal length can’t
be measured correctly.
Needle touched the metal repaired
material
Once the needle touched the
metal repaired material, current
measurement from the gums to the
periodontal tissue loss, the screen
will display “OVER”.
Adjacent surface has caries
Current measurement flow from
caries of the adjacent surface to
gums, then the root canal length
can’t be measured correctly.
There is collateral or the tooth root
is broken
Once the needle reached the
collateral or the broken part of the
tooth root, current
measurement will overflow from
periodontal ligament, it displays
“OVER”.
Is it because in addition to the top
pulp chamber, low tooth crown?
Or there are residues left?
Use rubber dam to prevent the
current flow to gums.