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Orthodontics · single question

What can cause an anterior open bite, EXCEPT:

  1. Microglossia (small tongue)
  2. Prolonged pacifier use
  3. Airway obstruction (mouth breathing)
  4. Tongue thrust
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Correct answer: A. Microglossia (small tongue)

  • A. Correct — MICROGLOSSIA (small tongue) is the EXCEPTION. A small tongue would NOT cause anterior open bite — in fact, microglossia results in a smaller tongue that doesn't push forward. A LARGE tongue (macroglossia) contributes to open bite. Microglossia is associated with UNDERDEVELOPMENT of lower face/retrognathia.
  • B. Incorrect — prolonged pacifier use IS a cause. It prevents full incisal eruption and anterior contact, causing open bite.
  • C. Incorrect — airway obstruction IS a cause. Mouth breathing (from nasal obstruction) leads to altered tongue posture and low tongue position, contributing to open bite and vertical growth pattern.
  • D. Incorrect — tongue thrust IS a cause. Persistent tongue thrust pushes anteriorly against the teeth, preventing incisal contact.

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