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Orthodontics · single question

Which of the following is NOT typically associated with anterior open bite?

  1. Tongue thrust
  2. Mouth breathing
  3. Thumb-sucking habit
  4. Microglossia (small tongue)
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Correct answer: D. Microglossia (small tongue)

Microglossia (abnormally small tongue) does NOT cause anterior open bite. Open bite is caused by forces preventing anterior tooth eruption: digit habits, tongue thrust, mouth breathing.
  • A. ❌ Tongue thrust prevents anterior tooth eruption.
  • B. ❌ Mouth breathing alters tongue posture contributing to open bite.
  • C. ❌ Thumb-sucking is a classic cause of anterior open bite.
  • D. ✅ CORRECT – Microglossia does not create the force preventing anterior tooth eruption.

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