Page13
Operation 2018-03-22
Root Canals not suitable for Electronic Measurement
Accurate measurement cannot be obtained with the root canal conditions shown below.
They 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 overflow 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.
Build-up
Clean
Gutta-Percha
Fracture
Branch
Содержание DENTA PORT ZX
Страница 2: ......
Страница 35: ......
Страница 36: ...2018 10 K 2 000 Pub No K093 80002 500 Printed in Japan...