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Distinguishing canals on a follow-up radiograph

Sometimes on a follow-up radiograph I confuse which gutta-percha cone belongs to which canal. What do you recommend?

Translated version of the Turkish original

There is the SLOB rule: same lingual, opposite buccal. If the X-ray tube is angled from the distal, the canal that appears farther distal is the lingual canal.

Author of the original answer: Doç. Dr. İsmail Davut Çapar

Medical review of the Turkish original:

Turkish answer published on this website:

Translation published:

The review date refers to the Turkish original; it does not indicate a separate medical review of the translation.