下颌第一前磨牙 mandibular first premolar ; The First Permanent Mandibular Premolar
上颌第一前磨牙 maxillary first premolar ; The First Permanent Maxillary Premolar
下颌右第一前磨牙 Mandibular right first premolar tooth
释义下颌左第一前磨牙 Mandibular left first premolar tooth
Anchorage loss measured at the first premolar averaged 1.3 mm,but the crowns tipped 3.5? distally.
5、每侧第一前磨牙的支抗丧失平均为1.3mm并伴3.5“的牙冠远中倾斜，这一结果不同于其它口内磨牙远移装置所造成的前磨牙牙冠近中倾斜，与国外对同类矫治器的观察结果相似。
参考来源 - 舌侧磨牙远移器矫治安氏Ⅱ类错（牙合）的临床研究③In maxillary frist premolar and mandibular second premolar extracted group,Cm SnLs increased and SNsSi decreased significantly(P＜0.01),H angle,Ls-SnPos,Li-SnPos reduced(P＜0.05).
③拔除上颌第一前磨牙下颌第二前磨牙组矫治后鼻唇角显著增加(p＜0.01),上唇基角显著减小(p＜0.01),H角、上唇突度、下唇突度减小(p＜0.05)。
参考来源 - 恒牙早期安氏Ⅱ~1类错（牙合）畸形拔牙矫治颌面软组织形态变化的头影测量研究·2,447,543篇论文数据，部分数据来源于NoteExpress
目的观察离体上颌第一前磨牙根管解剖结构。
Objective the aim of this study was to investigate the root canal system of maxillary first premolar .
结论：上颌第一前磨牙的根管类型相对复杂。
Conclusions: The roots of maxillary first premolars possesses a variety of canal system types.
目的研究上颌第一前磨牙根管颊舌向的弯曲情况。
Objective To investigate root canal curvatures of human maxillary first premolars in buccolingual directions.
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