18
part (near the root canal at the needle handle). If you grip the lower part (blade or
moving part), it will wear the metal part of the file folder and the resin part. [Picture
21]
Picture 21 Picture 22
b) When measuring the length of root canal, please don’t use the metal needle file.
If you operate the device without the dentistry glove,it will cause leakage and the
result of measurement will be inaccurate.Therefore, please use the resin needle file
and remember don’t touch the metal part with finger.
c) Please don’t use the worn file clip, and it will make the result of measurement
inaccurate.
d) Please reference the [Picture 22(a)] to grip the needle file. If as [Picture 22 (b)],
it can’t properly measure the length of the root canal due to the improper force, and
the front of the root canal pin is easy to wear.
4.2.6 When the file reaches the apex, adjust the rubber piece set on the endo file to
the reference point (incisal edge or fossa edge), then pull out the endo file, measure
the length between the top of the file and the rubber piece, and this is the working
length of the tooth. It also can be used with the touch probe instead of file clip, when
