英语语法分析

The microbial composition of subgingival plaque changes after bend is placed.

其带环放置后，龈下菌斑的微生物组成发生改变。

AIM: To observe the effect of hybrid subgingival scaling (combining ultrasonic scaling with hand scaling) by SEM.

目的：超声龈下刮治结合手工刮治，用扫描电镜的方法观察效果。

Methods: Areas of subgingival calculus were selected from 6 freshly extracted human teeth with periodontal disease.

方法：选取6颗新近拔除的有明显龈下牙石的牙周病患牙。