Permanent mandibular incisors most commonly erupt in which position relative to their primary predecessors?

Correct answer: A. Lingual to the primary incisors

• A. Correct. Permanent lower incisors typically erupt lingual to the exfoliating primary incisors (the 'ugly duckling'/double-row stage), then move labially with tongue pressure.
• B. Buccal/labial eruption is not the usual pattern for lower incisors.
• C. They erupt lingual, not directly beneath the primary roots.
• D. Position is described relative to the primary incisors, not the canines.