Pediatric Dentistry · single question
A child lost the primary mandibular second molar before the permanent first molar has erupted. Which space maintainer is indicated?
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Correct answer: B. Nance holding arch
- A. Incorrect. Lower lingual holding arch is used after permanent first molars have erupted to prevent mesial drift.
- B. Correct. The distal shoe is specifically designed for early loss of primary second molar BEFORE the permanent first molar has erupted. A metal extension goes subgingivally to guide the permanent first molar into correct position.
- C. Incorrect. Band and loop is used when adjacent permanent teeth have already erupted.
- D. Incorrect. Nance holding arch is a maxillary appliance, not for mandibular second molar loss.
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