该文报道1例下颌前磨牙区多生前磨牙患者,多生牙与正常的前磨牙大小、形态冠根比例等无明显区别。其病因可能是牙胚的分裂和增殖异......

Abnormalities of tooth number in development of the dentition are quite common;however, concomitant hypo-hyperdontia is ......