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1·Objective:To evaluate the contribution of radiogram in diagnosis of primary vertical root facture in mandibular first molar.

目的：评价直接数字化影像技术在下颌第一磨牙牙根纵裂诊断中的作用。

2·From among the many things we were offered as a present, it was difficult to make up our minds which to have, but in the end we settled for a radiogram.

从提供我们作为礼物的许多东西中，我们很难下决心接受哪种，但我们终于决定接受收音电唱两伤脑用机。

3·Results: 95 cases of major bronchopathy were proved to be correctly diagnosed by good tomography or high kilovoltage radiogram, the diagnostic accordance rate being 95%(95/100).

结果：95例由质量良好的体层或高千伏片作出诊断，诊断符合率为95％（95／100）。