... upper first molar 释义：上颌第一磨牙 lower first molar 释义：下颌第一磨牙 partial molar quantity 释义：偏克分子量,偏克分子数量 ...
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non-vital lower first molar 下颌死髓第一磨牙
Objective To evaluate the clinical effect of preserving the lower first molar with complete vertical fracture.
目的评价保存治疗纵折下颌第一磨牙的临床疗效。
Method: 29 lower first molar Spaces were observed and the height of alveolar crest before and after treatment were analyzed with paired-t tests.
方法：观察下颌第一磨牙陈旧性拔牙间隙29处。测量矫治前后该处牙槽嵴高度，将测量值进行配对t检验。
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