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. 2015 Aug 7;10(8):e0135273. doi: 10.1371/journal.pone.0135273

Fig 1. The patients of the PE group.

Fig 1

A) The facemask of the protraction appliance. B) The elastics were oriented in a downward and forward direction at an angle of approximately 30° relative to the occlusal plane.C) The protraction appliance hooks in the oral cavity. D)The oral appliance of the rapid palate expansion.