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Operation 12. 21. ’04
NOTE
Nickel-Titanium files are more easily broken than stainless steel files by the amount of torque
applied to them.
Keep the following points in mind to minimize the possibility of file breakage.
•
Before using micromotor, use a small hand file, such as #10 or #15, to penetrate the root canal
manually down apex and then return to the apical constriction.
•
All foreign matter, such as bits of cotton, should be removed from the root canal before using
the file.
•
Never use excessive force to insert or advance the file down the root canal.
•
Do not use the files in the root canals that have high degree of curvature.
•
Try not to trigger the Auto Torque Reverse function when advancing the file down the root
canal.
•
The recommended technique for shaping and cleaning the root canal is crown down technique.
When using this technique, follow the file manufacturer’s guideline.
•
If you encounter resistance or the Auto Torque Reverse is triggered, back the file up 3 or 4
mm and carefully advance it down the root canal again. Or replace the file with a smaller
size. Never use excessive force.
•
Do not force the file down the root canal or press it against the root canal wall as it could
break the file.
•
Do not use the same file continuously for more than 10 seconds in one position as it may
create “steps” on the root canal wall.
* Washing the root canal out with a chemical solution during instrumentation helps stable and
consistent file action.
* After root canal preparation, clean the root canal out ultrasonically.
* If necessary, make minor alterations to fit the of Gutta-Percha point.
Manual Mode Using the Foot Switch
The file can be rotated outside the root canal at the speed
set for M1, M2, or M3 by stepping on the foot switch. In
this case, the canal length indicator bar in the display will
disappear.
The canal length indicator bar will reappear if the file is
inserted into a root canal while it is rotating, and the unit
will operate normally.
Releasing the foot switch while the file is in the root canal
will not stop the file rotation.
WARNING
•
Be careful when using the foot switch; the motor may rotate regardless of the measurement
results.
NOTE
•
Be careful using the foot switch because the motor will run when you step on it even if the unit
is not measuring the root canal for some reason: for example if the contrary electrode is not
hooked in the patient’s mouth or the file electrode is not clipped to the file.
•
Be careful using the foot switch if the measurement display does not appear, such as when
measuring an extremely dry canal, because the motor will run even if a measurement is not
being made.
•
If the Auto Torque Reverse function is triggered when the micromotor is running in manual
mode with the foot switch, releasing the foot switch while the file is in the root canal will not
stop the file rotation until the torque applied to the file goes below preset torque reverse
setting.
