13
4.2.7 The acute inflammation surrounding the apex has been gone and the infected
material has been cleaned. It is also necessary to get rid of the pulp and necrosis tissue.
4.2.8 The following cases are not suited for a normal measurement:
Picture 10
Picture 11
Picture 12
Picture 13
Picture 14
Picture 15
•
The size of the root similar to the size of apical foramen
In this case, the measurement result of the length of the root canal will be shorter than
its real because of the hypoplasia of the root. (Pic 10)
• Bleeding or the blood overflow from the apical foramen
In this case, the blood will overflow from the root canal and reaches gingival that the
blood and the gingival will be on a conducting state which will cause an inaccurate result
while measuring. The measurement can be continued when the bleeding is stopped.
(Pic 11)
• The tooth crown is broken
The tissue of the gingival may reach the cavity of the endo hole at the broken point
which will cause inaccuracy because of the electronic conduction. The measurement
can be continued when the crown is fixed by gypsum or other insulators. (Pic 12)
• 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)
• A retreatment to an endo which was filled with guttapercha
Clean the remaining material in the root canal and fill it with little normal saline
before a measurement. (Pic 14)
• 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)
