First mandibular molar

• 下颌第一磨牙

First mandibular molar的用法和样例：

例句

1. ObjectiveTo investigate the effect of lingual inclination of the first molar of mandible by using intermaxillary traction and fixed flat bite-plate.
   研究应用交互牵引结合固定平面导板矫治下颌第一磨牙舌倾的临床效果。