第一前磨牙 meaning in English

first premolar
frist premolar

The long axises of miniature pigs teeth are 6 . 1 in the upper first molar , 6 . 5 in the lower first molar , 7 . 3 in the upper third premolar , 3 . 8 in the lower third premolar
结论小型猪咀嚼肌的形态、起止点、肌力方向都与人类有较大的相似性；第三前磨牙与第一磨牙长轴为近中倾斜，与人类第一前磨牙和第一磨牙近似。
Results : with three different retainer designs , the retainer on the second premolar and the first molar exerted the smallest stress on the abutment and its periodontal tissue , while the retainer on the first premolar and the first molar had the largest stress
结果：在3种不同的固位体设计方式中，固位体放置在第二前磨牙与第一磨牙之间时，基牙及牙周组织受力最小；固位体放置在第一前磨牙与第一磨牙上，基牙与牙周组织受力最大。