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。
Unfortunately, the fourth premolar in the upper jaw is quite large and looks like the first molar in the lower jaw; it is known as a carnassial tooth.
不幸的是，上颚的第四颗前臼齿很大，看起来就象是下颚的第一颗臼齿，这颗前臼齿也被称作叫裂齿。
Last premolar of upper jaw, first molar of lower jaw.
上颚最后的一只前臼齿，下颚最前的一只臼齿。
Body sizes for fossil taxa were estimated using regressions of body weight based on the area of the first lower molar for most species and on other teeth or limb bones for a few species.
大多数化石种类的体重通过下第一臼齿面积与体重的回归公式来估计，少数种类用其他牙齿或肢骨来估计。
Carnassial: Last premolar of upper jaw, first molar of lower jaw.
裂齿：上颚最后的一只前臼齿，下颚最前的一只臼齿。
Carnassial: Last premolar of upper jaw, first molar of lower jaw.
裂齿：上颚最后的一只前臼齿，下颚最前的一只臼齿。
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