Sinus Tract Tracing — NDEB AFK MCQ

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EasyEndodonticsSinus Tract TracingNDEB AFK

Which of the following clinical tests is used to differentiate between a sinus tract of endodontic origin and a periodontal fistula?

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Correct answer: D — Tracing the sinus tract with a gutta percha cone and taking a periapical radiograph

Tracing a sinus tract with a gutta percha cone (GP point inserted gently into the opening until resistance is met) and taking a periapical radiograph reveals the origin of the tract. If the GP point traces to the apex of a tooth, the source is endodontic (periapical abscess with chronic drainage). If it traces to the lateral root surface along the PDL, a lateral canal or vertical root fracture may be the source. Combined with vitality testing and periodontal probing, this technique helps establish whether the origin is endodontic, periodontal, or combined.

Reference: Torabinejad – Endodontics: Principles and Practice, 6th ed., 2021