Radiology · single question
A panoramic radiograph of a 12-year-old shows teeth #4 and #6 as impacted. Which tooth is most likely to erupt first?
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Correct answer: A. Tooth #15 (upper left second premolar)
- A. ✅ Correct. With #4 and #6 impacted, the next tooth available in the normal eruption sequence on the left side would be #15 (upper left second premolar), which would erupt without obstruction.
- B. ❌ Tooth #4 is impacted — it cannot erupt first.
- C. ❌ Tooth #17 (wisdom tooth) is the last to erupt — it would not erupt before a premolar.
- D. ❌ Tooth #6 is also impacted — it cannot erupt first.