Which radiographic feature most strongly suggests internal rather than external inflammatory root resorption?

  • Correct answer

    A symmetric, ballooning radiolucency that stays centred on the canal when the horizontal angle is changed

  • A radiolucency that moves away from the canal when the horizontal angle is changed

  • A canal outline that can be traced uninterrupted through the radiolucency

  • A ragged radiolucency on the outer root surface next to the periodontal ligament

This question is one of 15 in AFK practice: Endodontics. Test yourself on all of them.

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Explanations

  • Internal resorption enlarges the canal space itself, so the lesion stays centred on the canal at any angulation and the canal outline is lost within it. External resorption lies outside the canal, so it shifts with angulation and the canal can be traced through it.

    Source: Cohen's Pathways of the Pulp — oneguy

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