Picture 15
Picture 16
Picture 17
Sometimes, the results of the device 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 foramen slightly to the side of the root canal
crowns.In this case, according to the shooting angle as the belowing pictures
show, it will cause illusion that the front tip of the root canal haven't reached the
canal tip. [Picture 18]
(Because of the angles of X-rays,sometimes it can't take photo of the apical
foramen properly, so it can't show the accurate position of the apical foramen.)
18