第一磨牙 meaning in English

first molar

Stress distribution and displacement of transpalatal distraction ostegenesis at the first molar region on the craniofacial complex
第一磨牙处横向牵张成骨对上颌骨复合体应力分布和位移的影响
The angles of masticatory muscles and base plane are 63 . 9 in massater muscle , 114 . 55 in temple muscle , 64 . 4 in medial pterygoidp muscle
小型猪牙长轴倾斜度分别为：上颌第一磨牙6 . 1度，下颌第一磨牙为6 . 5度，上颌第三前磨牙为7 . 3度，下颌第三前磨牙为3 . 8度。
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。