上颌改良腭弓辅助压低纠正第二磨牙正锁（牙合）疗效观察

目的：利用改良腭弓矫治伴有上颌第二磨牙颊侧错位的单侧或双侧正锁（牙合）.方法：收集2008年6月～2012年8月第二磨牙正锁（牙合）正畸患者20例,男7例,女14例,年龄15～36岁.采用直径1.2 mm不锈钢丝弯制改良腭弓拉颊侧错位的上颌第二磨牙入牙列,根据错（牙合）情况下颌牙弓采用固定矫治器和/或交互牵引配合矫治,观察临床疗效.每个病例正锁（牙合）纠正前后拍摄曲面断层片及头颅侧位片,比较软硬组织的变化.结果：20例患者均在2～4.5个月内完成第二磨牙正锁（牙合）的矫治,磨牙建立良好的咬合关系,颅面软硬组织测量值没有明显变化.结论：改良腭弓是一种简单有效的矫治上颌第二磨牙正锁（牙合）的装置.

The effect of the modified maxillary palatal arch in correcting the second locked molar

Objective：The effects of the modified maxillary palatal arch to treat the unilateral or bilateral positive lockbite with maxillary second molar buccal dislocation.Method：20 orthodontic patients were recruited from June of 2008 to August of 2012 in the 307 Hospital,who were accompanied with the second molars lockbite.The modified transpalatal archs were bended with a diameter of 1.2 mm stainless steel wire pulling the maxillary second molars into arch.All patients,before and after the correction of lockbite,were taken panoramic radiographs and lateral cephalometric radiographs to compare the changes of soft and hard tissues.Result：All the 20 patients finished the treatment of second molar lockbite for 2～4.5 months.The molar region has established good occlusion,facial soft and hard tissue measurements did not change obviously.Conclusion：The modified transpalatal arch is a simple and effective device in treatment of the second molar lockbite with maxillary second molar buccal malposition.