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METHODS: Human premolars were collected and embedded in paraffin and cut into slices.
目的：研究血管活性肠肽在牙髓牙本质复合体中的表达，探讨其功能。
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Absence of more than two first premolars or absence of a first and a second premolar.
缺少超过两个第一前臼齿或者一个第一和一个第二前臼齿。
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AIM:To determine the frequency and degree of root canal curvature of human mandibular premolars in buccolingual directions.
目的：确定人下颌第一、二前磨牙的颊舌向根管弯曲程度和情况。
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Objective To determine the frequency and degree of root canal curvature of human maxillary first premolars in buccolingual directions.
目的 确定人上颌第一前磨牙的颊舌向根管弯曲程度和情况。
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Days after the extraction of the first premolars, the upper canines were subjected to coronally orthodontic extrusion movements.
后10天内提取的第一前磨牙，上尖牙受到冠正畸挤压运动。
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premolars：前磨牙
3、 前磨牙(premolars)又名双尖牙(bicuspidteeth),位于尖牙之后,磨牙之前,左右上下共8个. 牙冠呈立方形,又一个咬合面,一般为双尖,下颌第二前磨牙有三尖者,前磨牙有协助尖牙撕裂及协助磨牙捣碎食物的作用. 牙根扁,亦有分叉者,
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premolars：前齿
canine tooth 大齿 | premolars 前齿 | molars 后牙
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premolars：小臼齿
molars 大臼齿 | premolars 小臼齿 | canines犬齿
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premolars, bicuspid teeth：前磨牙
尖牙 cuspid teeth, canines | 前磨牙 premolars, bicuspid teeth | 磨牙 molars