Oral Surgery · single question
A radiograph shows a horizontally impacted mandibular 3rd molar associated with resorption of the distal root of the 2nd molar. What type of resorption is this?
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Correct answer: B. External (pressure) resorption
Pressure from an adjacent impacted tooth is a classic cause of external resorption of a neighboring root — the resorption originates from the outer (periodontal) surface of the root, not from within the pulp space as in internal resorption.