Large Taper Files
Large Taper Files
Engine-driven files
Hand-Using Large Taper Files
A, Lateral view. (SEM, ×50.) B, Cross section. (SEM, ×200.)
Large Taper File Advantages
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Easier
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Only one instrument sequence whatever the canal shape
An easy to remember protocol (color-coded)
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Faster
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Only 3 instruments needed in most cases
High cutting power
Large Taper File Advantages
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More efficient
increased apical taper for better canal cleaning
Better debris removal due to the unique <Multiple Taper> design of
these instruments
Safer
Guiding tip with rounded end to minimize canal deviations
These instruments are also available in manual version to treat
anatomically difficult cases or for clinicians who prefer to use
hand files for tactile control reasons
How to prepare root canal
by using Large Taper Files ?
M3 M2
M1 D2
D1
DX
1. Prepare a straight-line access cavity with no
restrictions in the entry path into the chamber
2. Establish proper access and a glide path with
No. 10 and No. 15 steel files to the working length
or the apical constriction exit.
3. Begin shaping with the D1 using multiple, passive-pressure passes.
Go no deeper than 1/3 of the estimated canal length.
Irrigate and recapitulate with a No. 10 hand file, establishing patency
to full working length.
With D1, extend the preparation
to full working length.
NaClO
EDTA
D1 shaping
Irrigation
recapitulation
4. “Brush” with the DX to improve the
straight-line access in short teeth or to
relocate canal access away from furcation in
posterior teeth.
5. D2 is now used to full working length.
Irrigate, recapitulate
NaClO
EDTA
D2 shaping
Irrigation
recapitulate
6. With M1, passively extend the preparation
to within 0.5 mm of the working length.
Withdraw after one second! And only one
second!
The M1 has a tip size of 0.20 mm, and if a No.
20 hand instrument is found to be snug, the
preparation is finished.
7. If the M1 and the No. 20 hand file are
loose, continue the preparation with the M2,
which is 0.25 mm diameter at the tip.
If the M2 and the No. 25 hand file are loose,
continue the preparation with the M3, which
is 0.30 mm diameter at the tip.
Frequent irrigation and file cleansing are imperative
irrigation and recapitulation!
5.25%NaClO
17%EDTA
irrigation
The data of engine-driven Large Taper files
File
Speed(rpm)
Torque(N· cm)
DX
300
3.0
D1
250
3.0
D2
250
1.0
M1
250
1.6
M2
250
2.0
M3
250
2.0
How to better use Large Taper Files
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Prepare a straight-line access cavity with no
restrictions in the entry path into the chamber.
Fill the access cavity with Sod Hypochlorite.
Establish a smooth glide path with No. 10 and
No.15 stainless steel hand files.
Use maximum magnification to observe the
movement of the rotary instrument. “Seeing”
rotary apical movement is safer than simply
“feeling” such movement.
How to better use Large Taper Files
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Use a torque- and speed-controlled electric motor,
powering the hand-piece at 200 to 300 rpm.
Be much gentler than with hand instruments. Always
treat in a moist canal. Irrigate frequently!
Slow down! Each instrument should do minimal
shaping. Only two, three, or four passes may be
required for the file to engage restrictive dentin and
carve the shape to the proper depth.
How to better use Large Taper Files

Instruments break when flutes become loaded
or when instruments are forced. Check the
flutes frequently under magnification and clean
them. Cyclic fatigue from overuse, or if the glide
path is not well established, also leads to
breakage.
How to better use Large Taper Files
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
Large Taper Files instruments are disposable
and, like all endodontic files and reamers, are
designed for single-patient use. Sometimes
instruments are even changed within the same
treatment (eg, in the case of a four-canal molar).
Irrigate with 17% EDTA or a viscous chelator
during the ProTaper shaping.
How to disinfect, clean and
sterilize files
1. Manual Cleaning or assisted by an
ultrasonic device
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No visible impurities should be observed on the
instruments.
Discard any instruments with large obvious defects (broken,
bent, and twisted).
The disinfecting solution should be aldehyde free and
without di- or triethanolamines as corrosion inhibitor.
2. Rinsing

Abundant rinsing (at least 1 min)
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Use quality water in accordance with local regulations.
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If a disinfecting solution contains a corrosion inhibitor, it is
recommended to rinse the instruments just before the
autoclaving.
Dry on a single use non-weaved cloth, or with a drying
machine or filtered compressed air.
3. Packaging
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Place the devices in a kit, support or container to avoid any
contact between instruments and pack the files in
“Sterilization pouches”.
Check the validity period of the pouch given by the
manufacturer to determine the shelf life.
Use packaging which are resistant up to a temperature of
141°C (286°F) and in accordance with EN ISO 11607.
4. Sterilization
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Steam sterilization at: 134 °C / 273°F during 18 min.
Use only autoclaves that are matching the requirements of
EN 13060, EN 285.
Use a validated sterilization procedure according ISO
17665
Control the efficiency (packaging integrity, no humidity,
color change of sterilization indicators).
5. Storage
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
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Keep devices in sterilization packaging in a
dry and clean environment
Sterility cannot be guaranteed if packaging is open,
damaged or wet.
Check the packaging before using them (packaging
integrity, no humidity and validity period).
Thank you!
To order email to
icdr@hotmail.com or
call 94481 91202