Objective: To investigate the morphology of physiological foramen of mandibular premolars.

研究目的：探讨下颌前磨牙生理性根尖孔的形态特征。

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Objective: To investigate the morphology of physiological foramen of mandibular premolars.

研究目的：探讨下颌前磨牙生理性根尖孔的形态特征。

youdao