目的比较引导牙周组织再生术（GTR）和牙周翻瓣术治疗牙周病的疗效。
Objective Compare the treatment effects between guided tissue regeration (GTR) and periodontal flap procedure in periodontal disease.
目的比较引导牙周组织再生术（GTR）和牙周翻瓣术治疗牙周病的疗效。
Objective Compare the treatment effects between guided tissue regeration (GTR) and periodontal flap procedure in periodontal disease.
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