skip to main content

Posterior crossbite in mixed dentition — NDEB AFK MCQ

Instant feedback + full explanation. One question, done properly.

ModerateOrthodonticsPosterior crossbite in mixed dentitionNDEB AFK

An 8-year-old has unilateral posterior crossbite with a mandibular shift on closure. When guided into centric relation, the maxillary arch appears constricted bilaterally. What is the most appropriate treatment?

Educational content. Not a substitute for clinical judgement or local policy.

Reveal the answer and explanation

Correct answer: C — Maxillary expansion in mixed dentition

A functional unilateral posterior crossbite caused by maxillary constriction is typically managed with maxillary expansion during the mixed dentition. Waiting can allow adaptive asymmetric growth and persistent occlusal shift. The pearl is to assess centric relation because an apparent unilateral crossbite may reflect a bilateral transverse discrepancy.

Reference: NDEB orthodontic reference texts; NDEB KSAs 2024