低位近中阻生的下颌第二磨牙常由于牙冠暴露不足及第三磨牙的影响较难矫治，本病例利用下颌舌弓增强支抗，自制颊侧弹簧加力竖直阻生的下颌第二磨牙，操作简单，治疗速度快，效果好。%The treatment of low mesioangular impaction of second molar is difficult because of the little crown exposure and the influence of the third molar.We used modified lingual arch as a stronger anchorage to upright the lower second molars combined with manufactured spring,the treatment procedure is simple and effective.
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