The fabrication and clinical application of semi-fixed mandibular lingual arch expansion appliance / 华西口腔医学杂志

Semi-fixed mandibular lingual arch expansion appliance is composed of a mandibular molar band, a keyway and arch expansion spring. The arch expansion spring are used to expand maxillary arch symmetrically or asymmetrically when bolts of the two ends are inset into keyways. Dental arch expansion appliance for 25 patients with mandibular arch stenosis showed that semi-fixed mandibular lingual arch expansion had good effect and could be used to expand mandibular arch.

Series orthodontic treatment on teeth transposition of maxillary canine and lateral incisor / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To explore the treatment on teeth transposition of maxillary canine and lateral incisor in order to improve the clinical treatment effect.</p><p><b>METHODS</b>Eleven patients with transposition maxillary canine and lateral incisor were treated with the method: Expand space, artificial reverse occlusion of transpositional lateral incisor to give way, transpositional lateral canine distalization and controlling root, mesial movement of lateral incisor with tongue arch, interactive controlling roots and retention with tongue fixed retaining appliance.</p><p><b>RESULTS</b>Eleven patients had satisfactory treatment effect, with tidy dentition and parallel teeth roots of transpositional canine and lateral incisor.</p><p><b>CONCLUSION</b>Series orthodontic treatment on teeth transposition of maxillary canine and lateral incisor can effectively improve the clinical treatment effect and shorten the treatment time.</p>