【摘要】 目的　探讨正畸螺旋器缩弓治疗以上牙弓较宽为主的正锁的新途径。方法　对入选的 17例正锁患者进行模型分析 ,间隙开辟 ,再用螺旋器缩弓治疗。比较治疗前后牙弓宽度变化。结果　全部患者的正锁均得到矫正 ,牙弓宽度平均缩小 :单侧锁为 2 .5mm ,双侧锁为 4.5mm。正畸螺旋缩弓器戴用时间为 6～ 15周 ,平均为 8周。结论　正畸螺旋缩弓器治疗正锁能提供颌内强支抗 ,力源稳定 ,治疗时间短 ,同时能避免锁牙伸长更多还原

【Abstract】 Objective [WT5”BZ]The purpose of this study was to investigate the outcome of buccal crossbite treated with orthodontic screw contraction appliance(OSCA).[WT5”HZ]Methods [WT5”BZ]17 patients with buccal crossbite were treated by OSCA after analysing models and creating space. Pre and post treatment arch width was measured.[WT5”HZ]Results [WT5”BZ]All buccal crossbites were corrected by OSCA. On average, arch width change of unilateral and bilateral buccal crossbite was 2.5mm and 4.5mm respectively. Treatment time ranged from 6 to 15 weeks, mean 8 weeks.[WT5”HZ]Conclusions [WT5”BZ]OSCA can be used to correct buccal crossbite. The orthodontic force is stable. The treatment time is short and the extrusion of posterior teeth can be avoided. [WT5”HZ]更多还原