A Barbed broach is an
instrument used to remove pulp tissue during endodontic(root canal)
treatment.It is manufactured from round wires, and the smooth surface is
notched to form barbs.
The barbed broach is an
extirpating, NOT an enlarging, instrument.
The barbed broach is formed from a
tapered round shaft by lifting up portions of metal of the shaft almost at a
right angle to the shaft.
These elevated barbs will engage the
pulp tissue and remove it from the canal.
In its use, the largest size broach
which will fit freely - loosely - in the canal is selected.
A broach must not engage the canal
walls as it is advanced, or the pressure on the barbs will flatten them against
the shaft; as the instrument is withdrawn, the barbs will then embed themselves
in the walls, making it difficult or impossible to remove the broach.
Because the barbs are
"nicked" out of the shaft this is an extremely fragile instrument,
and will break easily if misused. It must fit loosely.