12
• Make sure the
fi
le or reamer is properly clipped on. Otherwise, it may not make a correct
measurement or the
fi
le holder could be damaged.
OK
NG
4. Usage
1
Hook the contrary electrode in the corner of the patient’s mouth.
• Make sure that the contrary electrode,
fi
le holder and connecting portions of these parts do not
come into contact with an electric power source such as an electrical socket. This could result in
a severe electrical shock.
• The contrary electrode could cause an adverse reaction if the patient has an allergy to metals.
Ask the patient about this before using the contrary electrode.
• Take care that medicinal solutions such as formalin cresol (FC) or sodium hypochlorite do not
get on the contrary electrode or the
fi
le holder. These could cause an adverse reaction such as
in
fl
ammation. If these solutions are spilled on these parts, wash them with water.
2
Clip on the hand
fi
le with the
fi
le holder.
(1) Press down the
fi
le holder button with your thumb.
(2) Clip the
fi
le holder on the metal shaft of the
fi
le in the root canal.
(3) Release the button.
Clip the upper part of the
fi
le shaft, near the handle, with the
fi
le holder. The metal and
plastic part of the
fi
le holder can be damaged if they are attached to the
fi
le’s cutting part or
the transition to the cutting part.
For root canal length measurement, use
fi
les and reamers with plastic handles only.
If you are not wearing dental gloves, do not use the
fi
le having a metal handle. Electrical
leakage will occur when the handle is touched by
fi
ngers if you are not wearing gloves, and
this will prevent an accurate root canal length measurement. Even if the
fi
le handle is made
of plastic, make sure not to touch the metal part of the
fi
le with
fi
nger.
Do not use damaged
fi
le holders. Measurements cannot be made if these connections are
reversed.
4.3.2 Measurement
Push button
Cutting part and transition to
the cutting part
File Holder
Shaft