Rapid Palatal Expansion — NDEB AFK MCQ

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ModerateOrthodonticsRapid Palatal ExpansionNDEB AFK

A patient presents with an anterior open bite and bilateral posterior crossbite. The maxilla is narrow and constricted. Which appliance is most appropriate as the first phase of treatment?

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Correct answer: B — Rapid palatal expander (RPE)

Rapid palatal expander (RPE) is the first-line treatment for a constricted maxilla causing bilateral posterior crossbite. RPE separates the midpalatal suture (effective in patients under approximately 14-15 years with patent suture), increasing transverse maxillary width. Resolution of the bilateral crossbite may also partially correct the anterior open bite by allowing the mandible to reposition. Fixed labial braces address alignment but not skeletal transverse deficiency.

Reference: Proffit – Contemporary Orthodontics, 6th ed., 2019