Methods 165 patients divide into 2 groups randomly.the experiment group are 86 patients treated with stern ERA attachments and 79 patients in the control group treated with conventional clasps.

• 方法165例牙周病合并游离端缺失的患者,随机分为2组,实验组86例,用太极扣附着体修复,对照组79例,为常规卡环式可摘义齿修复。