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Orthodontics · single question

All of the following can cause a posterior CROSSBITE EXCEPT:

  1. Airway obstruction (mouth breathing)
  2. Prolonged pacifier use
  3. Microglossia
  4. Tongue thrust
Show answer and explanation

Correct answer: C. Microglossia

  • A. Not the exception. Chronic mouth breathing alters tongue posture and narrows the maxilla, predisposing to crossbite.
  • B. Not the exception. Prolonged sucking habits constrict the maxillary arch.
  • C. Correct — the EXCEPTION. MICROglossia (small tongue) would not widen pressure on the arch; macroglossia or abnormal tongue posture is more relevant. A small tongue does not cause posterior crossbite.
  • D. Not the exception. Tongue thrust/abnormal tongue function can contribute to malocclusion including crossbite.

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