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Orthodontics · single question

When is a midline diastema MOST likely to close spontaneously?

  1. When the diastema is greater than 4 mm
  2. When the diastema is 2 mm or less
  3. When the permanent canines erupt
  4. When the patient undergoes orthodontic treatment
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Correct answer: B. When the diastema is 2 mm or less

A midline diastema of 2 mm or less has the highest likelihood of spontaneous closure as the permanent teeth continue to erupt, particularly after the maxillary canines erupt and push the lateral incisors mesially, which in turn closes the diastema. Larger diastemas (>2 mm) are less likely to close spontaneously and may require orthodontic intervention. The 'ugly duckling stage' (mixed dentition) is when midline spacing is most prominent — it often resolves with canine eruption.

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