关键词: 【关键词】前方牵引, Pendulum矫治器, 前牙反牙合, [Key words]maxillary protraction, Pendulum appliance, anterior crossbite

Abstract: Objective To evaluate the effects of maxillary protraction and Pendulum appliance on the treatment of anterior crossbite in early permanent dentition. Methods 12 patients (4 male,8 female) with anterior crossbite and crowded upper dentition in early permanent dentition were selected, aged from 9～12 years old(10.7 on average). All the patients were treated with maxillary protraction for 3 to 6 months first. And then the modified Pendulum appliance was applied for distal movement of molars for 2 to 6 months to provide space for aligning the upper dentition. Finally the MBT straight wire appliance was used to complete the treatment. Treatment effects were evaluated by cephalometric analysis. Results After treatment, all the patients obtained normal overbite and overjet: ANB increased by 2.57°; overjet increased by 6.32mm; upper central incisors proclined by 8.58 °and moved mesially by 5.22mm; upper first molars inclined distally by 3.17 °and moved distally by 2.87mm. Conclusion For the patients with anterior crossbite and crowded upper dentition , maxillary protraction combined with Pendulum appliance can obtain good results, but the clinical choice of cases should be cautious to avoid excessive mesial movement of upper incisors.