关键词: 前方牵引 , 舌习惯 , 高角 , 骨性Ⅲ类错牙合.

Abstract: Objective To investigate the clinical effects of maxillary protraction and tongue crib in the treatment of skeletal class III high angle with the tongue thrust habit cases. Methods Using cephalometric analysis technique to analyze the seven patients’ soft and hard tissue changes after maxillary protraction and tongue crib treatment. Results Anterior teeth of all the patients got the normal overjet, normal or slightly shallow overbite. Maxilla grew forward, mandible moved back. The mandibular plane angle had no significant change. The discrepancy between maxilla and mandible were improved. The nasolabial angle reduced and face significantly improved．Conclusions Maxillary protraction and tongue crib treatments can effectively treat the skeletal class Ill high angle patients with the tongue thrust habit.

Key words: maxillary protraction, the tongue thrust habit, high angle, skeletal class Ⅲ malocclusion