Difficult canals, severely curved, possibly with significant hypercalcification, making any first penetration tricky with the finest hand files.
Canals of average difficulty with moderate curvature and/or more hypercalcification, making first penetration with a n°10 K file harde to achieve.
Easy canal preparation, low curvature, orifice and canal large enough to allow a n°15 K file to reach the Apex
Rotation speed
The rotation speed must be 300 to 600 rpm.
First penetration
The first penetration is performed with a conventional hand instrument (usually a n°10 K file-MMC n°10/21 mm). This is used to confirm the working length (WL), canal
anatomy and diagnosis from the pre-operative X-ray.
Canal mineralisation and curvature will determine the treatment difficulty and thus the most suitable instrumentation sequence for the clinical case.
Penetration levels
.06 taper files are brought to 2/3 of the working length.
04 taper files are brought to WL.
An accurate determination of the working length between
the passage of the .06 and .04 file is strongly recommended.
Operating procedure
HERO Shaper® is positioned at the canal entrance. The motor is started and
maintained at constant speed whilst the file is working and until it is completely withdrawn from the canal.
The file is inserted to the desired working length with a short in and out movement using light pressure.
HERO Shaper® also allows circumferential filing to be achieved which permits the canal anatomy to be taken into account and in particular to shape lateral zones.
Irrigation
It is important to thoroughly irrigate the canal between the passage of successive instruments.
