[Changes of airway before and after Twin-block treatment in patients with mandibular retrusion].

Purpose: To observe the changes of upper airway and the effect of different tongue position on upper airway volume before and after Twin-block treatment in patients with Class II division 1 malocclusion and mandibular retrusion.

Methods: Thirty-three patients (ages:11.3±0.

[Three-dimensional localization and assessment of maxillary palatal impacted canines with cone-beam computed tomography].

Purpose: To evaluate the location of maxillary palatal impacted canines and resorption of neighboring incisors with cone-beam computed tomography (CBCT).

Methods: Twenty-two healthy adolescent patients who had received orthodontic treatments at Stomatological Hospital of Nanjing Medical University were selected and scanned by CBCT. Palatal impacted maxillary canines were reconstructed by Dolphin imaging 11.