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Root canal with a large apical foramen
Root canal with exceptionally large apical foramen due
to a lesion or incomplete development might disturb the
electrical signal.
Root canal with liquid overflowing from the opening
Root canal with blood or any other liquid overflowing
from the opening and in contact with the gingival tissue
might disturb the electrical signal.
If the crown is broken and a section of the gingival tissue
intrudes into the cavity surrounding the canal opening,
the contact between the gingival tissue and the file might
disturb the electrical signal.
Fractured tooth might disturb the electrical signal.
Re-treated root canal filled with gutta-percha
Debris of gutta-percha might disturb the electrical signal.
Crown or metal prosthesis touching gingival tissue
The contact between the prosthesis and the file might
disturb the electrical signal.
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