Internal Resorption Radiograph — MFDS Part 1 MCQ

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ModerateRadiologyInternal Resorption RadiographMFDS Part 1

Two periapical radiographs of a permanent maxillary incisor are taken at different horizontal angulations. Which radiographic pattern is most characteristic of internal inflammatory root resorption?

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Correct answer: C — A smooth, symmetrical enlargement of the canal that remains centred on both views

Explanation lettering: D = shown as A · C = shown as B · A = shown as C · E = shown as D · B = shown as E

The correct answer is A. Internal inflammatory root resorption begins on the pulpal surface of dentine and typically produces a smooth, symmetrical or balloon-like enlargement of the pulp chamber or root canal. The defect remains centred on the canal when the horizontal angulation is changed. An eccentric, irregular defect that moves relative to the canal on parallax views favours external root resorption (B). A lesion centred beyond the apex suggests apical periodontitis or another periapical lesion (C), while a radiopaque apical mass is not characteristic of inflammatory internal resorption (D). Canal narrowing or obliteration represents calcific change rather than destructive internal resorption (E). CBCT may be justified when two-dimensional imaging cannot establish the lesion's origin or extent.

Reference: Patel S et al. Present status and future directions: Root resorption. International Endodontic Journal. 2022;55(Suppl 4):892-921. https://pubmed.ncbi.nlm.nih.gov/35229320/