Precision Tech Apica Air Mode D'emploi page 37

Difference measuring result between Apex locator reading and Radiography
Sometimes the reading of the apex locator reading does not correspond to the X-ray image. this does not
mean inaccurate of apex locator or X- ray, depending on the angle of the X-ray beam, the root tip may
not be displayed correctly. The position of the root tip seems to differ from its true position.
Crown or metal prosthesis that touches gingival tissue
Accurate measurement cannot be obtained if the file touches a mental
prosthesis that is touching gingival tissue. In this case, widen the opening
at the top of the crown so that the file will not touch the mental prosthesis
before taking a measurement.
Cutting debris on tooth Pulp inside canal
Remove all cutting debris on the tooth.
Remove all the pulp inside the canal. Otherwise an accurate
measurement cannot be obtained.
Caries touching the gums
In this case, electrical leakage through the caries infected area to the gums
are impossible to obtain an accurate measurement.
Blocked canal
The meter will not run if the canal is blocked. Opening the canal all the
way to the apical construction to measure it.
Extremely dry canal
If the canal is extremely dry, the meter may not work until it is quite close
to the apex. In this case, try to moisten the canal with oxydol or saline.
The X-ray photo shows that the actual apex of the root canal is not the
same as the anatomic end. In fact, the apical foramen is located at the
coronal end. in this case, X-ray may indicate that the file needle has not
reached the apical foramen, even if it has actually reached the apical
foramen.
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