13
d）There’s a crack on the tooth root
In this case, the crack may cause the electric leakage which will affect the
accuracy of the measurement.（Pic 13）
e
）
A retreatment to an endo which was filled with gutta-percha
Clean the remaining material in the root canal and fill it with little normal saline
before a measurement.
（
Pic 14
）
f
）
There is a metal crown which has connected to the gingival
It will cause an inaccuracy when the endo file touches metal crown.
（
Pic 15
）
Sometimes, the results of the Apex Locator and
X-Rays do not meet each other, which is neither
because the machine is not normal, nor the photo is
incorrect taken. The actual position of the apical foramen
is different from the anatomical one it is very common
that the apical slightly to the side of the root canal crowns.
In this case, according to the shooting angle as the bellowing picture show, it will
cause illusion that the front tip of the root canal haven’t reached the canal tip.
Picture 15
Picture 14
Picture 13
Picture 10
Picture 11
Picture 12
Picture 16
