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Third Molar Radiographic Signs — NDEB AFK MCQ

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ModerateRadiology & ImagingThird Molar Radiographic SignsNDEB AFK

Which radiographic sign suggests a close relationship between a mandibular third molar root and the inferior alveolar nerve canal?

Educational content. Not a substitute for clinical judgement or local policy.

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Correct answer: E — Darkening (radiolucency) of the root at the point of canal overlap

Darkening or loss of the root outline (radiolucency) at the point where the root overlaps the inferior alveolar canal is one of seven panoramic radiographic signs suggesting close proximity to the IAN. Other signs include interruption of the canal cortex, diversion of the canal, narrowing of the canal, narrowing of the root, deflection of the root, and bifid root apex. The presence of two or more signs warrants CBCT investigation before extraction.

Reference: White & Pharoah – Oral Radiology: Principles and Interpretation, 8th ed., 2019