Pediatric Dentistry · single question
Which of the following teeth is LEAST likely to erupt ectopically?
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Correct answer: C. Mandibular lateral incisor
- A. Incorrect. Ectopic eruption of the MAXILLARY FIRST MOLAR is common in the mixed dentition (about 2–6%), where the molar becomes locked under the distal of the second primary molar and resorbs its root.
- B. Incorrect. The MANDIBULAR SECOND MOLAR frequently erupts mesially angulated and becomes impacted against the distal of the first molar, particularly in arches with limited posterior space.
- C. Correct. The MANDIBULAR LATERAL INCISOR erupts early into an arch with comparatively generous space and a short, direct eruption path, and it is the least likely of these to erupt ectopically.
- D. Incorrect. The MAXILLARY CANINE is the classic ectopic eruptor — it has the longest and most tortuous eruptive path of any tooth, and palatal impaction/ectopic eruption affects roughly 1–2% of the population. It is also the tooth most associated with resorption of the adjacent lateral incisor root.
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