Methods:The extract tooth sockets were established by extracted two premolars in each quadrant of a dog. The tooth sockets were covered with the modified PHBm, PHBm and without covering.

• 方法 :拔除 4只家犬双上下颌骨两颗前磨牙 ,分别采用改性PHBm覆盖、单聚PHBm覆盖及无膜空白对照处理。