观察固齿增骨散治疗慢性牙周炎31例，并设对照组30例。

There were 31 cases in the treatment and 30 in the control group.

youdao

观察固齿增骨散治疗慢性牙周炎31例，并设对照组30例。

There were 31 cases in the treatment and 30 in the control group.

youdao