Methods The venous bloods were collected in 54 ROU patients and 51 healthy adult controls,and the activity of plasma SOD are investigated by the method of xanthine oxidase.

• 方法选择复发性口腔溃疡患者54例,健康成人51例,取静脉血用黄嘌呤氧化酶法测定血浆超氧化物歧化酶活性。