Objective: To investigate the root and canal morphology of extracted mandibular premolars.
目的：研究离体下颌前磨牙的牙根及根管形态。
Objective To investigate the root and canal morphology of extracted maxillary second premolars.
目的观察上颌第二前磨牙的牙根及根管形态。
Researches on Morphology and Anatomy of Root System of Dendrobium nobile Lindl.
金钗石斛根系的形态及解剖学研究。
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