22
Problems
Possible causes
Solutions
Display not steady while
measuring: the measurement
result is rather longer or
shorter; numerical display
irregular.
If 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.
If the 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”.
If the 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.
Whether 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.
