A midline diastema is most likely to close spontaneously when it measures:

Less than 2 mm
Size does not affect closure
Greater than 2 mm
Exactly 2 mm

Show answer and explanation

Correct answer: A. Less than 2 mm

Diastemas <2mm have high probability of spontaneous closure as permanent canines erupt and push centrals together (ugly duckling stage). >2mm = less likely to close, may need orthodontics.

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