For the
success of root canal treatment it is important to locate all canals, do proper
instrumentation and obturate. Locating MB2 canals in the maxillary molars is a
tricky process, but not so difficult if a specific strategy is followed.
Variation in the location
of MB2
It is
important to understand that the MB2 may be very close to the MB1, or may be
away by 1 to 3 mm. Have a look at these:
Where is the MB2?
Proper
access preparation is important. Remove the pulp chamber roof completely.
Imagine a line from the palatal canal to the MB1 orifice. MB2 will always be
placed mesial to this line, but it may be somewhere within the oval seen here:
Sometimes
there will be a dentin lip covering the MB2 orifice. Take your endodontic
explorer and scrape in this oval area to remove it if present.
Insert the
file into the MB1 canal. Slowly retract it to just out of the orifice, move it
mesial to the line connecting palatal canal and the MB1. Change its direction
from mesiobuccal to mesial and gently poke around in the oval area that you
saw. When it enters the MB2 orifice, release your fingers from around the file,
but keeping them in the same position, without touching the file. This gives
you the exact direction of the canal. Now slowly go deeper.
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