User`s manual

Operation 2011-09-30
11
Clean
Build-up
Fracture
Branch
Gutta-Percha
Root Canals not suitable for Electronic Measurement
Accurate measurement cannot be obtained with the root canal conditions shown below.
There may be cases other than these where an accurate measurement cannot be made.
Root Canal with a large apical foramen
Root canal that has an exceptionally large apical foramen due
to a lesion or incomplete development cannot be accurately
measured; the results will show shorter measurement than
the actual length.
Root Canal with blood, saliva or a chemical solution
overflowing from the opening
If blood, saliva, or a chemical solution overflows from the
opening of the root canal and contacts the gums, this will
result in electrical leakage and an accurate measurement
cannot be obtained. Wait for bleeding to stop completely.
Clean the inside and opening of the canal thoroughly to get
rid of all blood, saliva and chemical solutions and then make
a measurement.
Broken crown
If the crown is broken and a section of the gingival tissue
intrudes into the cavity surrounding the canal opening,
contact between the gingival tissue and the file will result in
electrical leakage and an accurate measurement cannot be
obtained. In this case, build up the tooth with a suitable
material to insulate the gingival tissue.
Fractured tooth
Leakage through a branch canal
Fractured tooth will cause electrical leakage and an accurate
measurement cannot be obtained.
A branch canal will also cause electrical leakage.
Re-treatment of a root filled with gutta-percha
The gutta percha must be completely removed to eliminate
its insulating effect. After removing the gutta percha, pass
a small file all the way through the apical foramen and then
put a little saline in the canal, but do not let it overflow the
canal opening.