Methods 165 patients divide into 2 groups randomly, the experiment group are 86 patients treated with stem 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。