14
Case 6
There is a metal crown which has connected to the gingival.
It will cause inaccuracy when the endo file
touches metal crown
Case 7
Sometimes, the results of the Apex Locator may not match
the X-ray reading. This does not necessarily mean that the
machine is not normal or that the photo was taken incorrectly.
The actual position of the apical foramen is different from the
anatomical one. It is very common that the apical foramen is
slightly to the side of the root canal crowns. In this case,
according to the shooting angle, it may create an illusion that
the front tip of the root canal haven’t reached the canal tip.
(Due to the limiting angles of X-rays, sometimes the photo
taken may not show the accurate position of the apical foramen.)