英语语法分析

Part 6: Risks in orthodontic treatment.

第6部分：风险的矫正治疗。

Objective To investigate the health of children with orthodontic treatment.

目的：探讨儿童正畸患者的口腔保健情况。

To evaluate the time effect on mechanical properties of orthodontic arch wires.

目的评价临床使用时间的长短对弓丝机械性能的影响。