... 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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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。
A tooth adapted for tearing apart flesh especially one of the last upper premolar or first lower molar teeth in carnivorous mammals.
裂齿，食肉齿适合于撕裂肉的牙齿，尤指食肉哺乳动物最后上前臼齿之一或第一个下臼齿。
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