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Interruption of measurement
During the length determination the file clip may be disconnected from the file and reconnected at
any time (e.g. when the file is changed to a larger size or when the length of another canal should
be determined). The device detects automatically that a new length determination cycle is
initiated.
3.6.5 Tips for Successful Length Determination
Please review the below checklist to better understand any implausible measuring results and to
take appropriate actions:
Too fast movement or even jumping to the apex is indicated for the following reasons:
SOLUTION
SYMPTOM
Excess liquid in the pulp chamber or root canal
(rinsing solution, blood or saliva), creating wrong
conductive path and incorrect measurements.
Gingival proliferation can lead to direct contact with
the measuring file causing a short circuit and
incorrect measurements.
The measuring file contacting metallic restorations
(crown, parapulpal post, amalgam filling) may cause
a short circuit and incorrect measurements.
Dry the access cavity with a cotton
pellet/ air-blower. Wait until excess
bleeding can be stopped.
Isolate the access cavity by:
• adequate preparation filling
• placing a rubber dam
• electrocauterizing
Carefully enlarge the access cavity and
isolate with flow composite.
Widen carefully the opening at the
top of the crown.
Too lazy or extremely delayed movement is indicated for the following reasons:
SOLUTION
SYMPTOM
Obliterated root canal Impeding the conductive
path and preventing normal device functioning.
Retreatment: Blockage by old canal filling material
residue, impeding the conductive path and
preventing normal device functioning.
Blockage by remnants of a medicated substance
(e.g. calcium hydroxide) impeding the conductive
path and preventing normal device functioning.
• Check the comparative x-ray for hints.
• Catheterize with ISO 06/ 08 file till the
working length.
Take an x-ray to re-check and try to
completely remove the old
canal filling material prior to measuring
Completely remove the remnants prior
to measuring.
Extremely dry root canal impeding the conductive
path and preventing normal device functioning.
Rinse root canal with irrigating solution
such as NaCl or NaOCl and dry the
access cavity with a cotton pellet/
air-blower.
49
50
Warning: In some cases precise determination of file position cannot be obtained.
Special condition symptom: Exceptionally large
apical foramen due to lesion or incomplete formation.
Root fracture or perforation.
May lead to shorter measurement than
the actual length.
May lead to incorrect measurements.
Содержание Apica Pro
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