4
• Place the instruments, unwrapped, in the autoclave tray.
• Use fresh distilled or deionized water.
• Steam Autoclave at 136 (± 2)˚C for 20 minutes.
Crown Down Preparation
As the instrument is moved apically, it planes the walls of the canal,
smoothing and making them circular. This reaming action, in conjunction
with the variably-tapered shape, produces a “crown down” preparation
resulting in a funnel-form taper from orifice to apex – quickly and efficiently.
Additionally, dentin, which has been cut off the canal wall, is captured in
the flutes and removed while the file is taken out. The small common tip size
and maximum 1.0 mm flute diameter ensures maintenance of a small apical
reparation and predefined shape.
ProFile GT files feature flat outer edges with a patented U-file design to
prevent self-threading of the instrument when introduced into the canal. The
flat outer edge also keeps the instrument centered in the canal, preventing
stripping and zipping of the canal.
Transportation and ledging are unlikely to occur because of the ProFile
GT file’s conical-shaped tip. Instead of a transition angle, there is a smooth
radius from the shank of the instrument to the end of the tip. ProFile GT files
are constructed from super-flexible nickel titanium, which allows creation of
a tapered funnel around curvatures, while keeping the preparation in the
canal’s original position.
Caution
Choosing an overly large file can lead to dangerous over-enlargement of
the coronal portion of narrow root forms. Additionally, too large a file taken
to length increases the risk of file separation.
Instrumentation Technique
Create straight-line access to canal orifice.
• Negotiate all root canals to their terminus with stainless steel Lexicon
®
K-Files, in the presence of ProLube
®
root canal conditioner. Establish
patency by taking a #10 K-File at least 1 mm past the canal terminus,
and at least a #15 K-File to the terminus.
Shape the canal, using the crown down method.
• Crown-down shaping always begins with a 20/10 GT rotary file,
regardless of canal form and size.
3
Procedures for Using the Aseptico Endo DTC Motor
Preset torque settings are recommended for each file series. They are
given without guarantee of risk or fracture. To avoid separation, remember
torque control motors are not a substitute for proper technique.
When you remove the Endo DTC from the box, you must set the motor to
accommodate the reduction contra angle you will use. To do this, turn on the
power, and the motor automatically will lead you through the process. On
the screen, you will see “1/8 handpiece TUL.” Enter “2” for yes or “1” to go
to the next handpiece selection. Simply select the handpiece you will use.
You will notice the GT system technique is set as the default and is
displayed as “20 series.” Press “1” to begin the 20 series, starting with the
.10 taper and the .08 taper. Depress the foot pedal to begin instrumentation
with these files.
You will notice the contra angle reduction, RPM and torque limits are
displayed as long as you are pressing the foot pedal. To move to the 20
series .06 and .04 taper files, press “1” again and begin instrumenting. To
use the accessory files, press “1” a third and final time.
To use the 30 series files, press the “2” button, and the “30 series” screen
will appear. Press “2” again to get the .10 and .08 taper settings. Follow
the same steps used above to instrument using this file series. To use the 40
series files, press the “3” button. Again, follow the same steps as above to
advance through these instruments.
You can use the accessory files in any of the three series settings simply
by pressing that series button three times or until the accessory files are
displayed on the screen. For high-speed use of this motor, press the
“ration” button up or down until “5/1 BPR” appears on the screen. Now
you are ready for high-speed use (150,000 RPM). Refer to your Endo
DTC instruction manual for more operational features and maintenance
procedures.
Procedures for Using Other Torque Control Motors
Refer to manufacturer’s directions for use.
File Sterilization
Files must be sterilized before use. ANSI/ADA Specification 28
recommends:
• Scrub the instruments with soap and warm water.
• Rinse thoroughly with distilled or deionized water.
• Allow to air dry.