Congenital Missing of Maxillary First Premolar and Ectopic Initiation of Canine
ZHANG Zhan-bo, WEI Jun-ping, ZHEN Xin-le
《Journal of Oral and Maxillofacial Surgery》 . 2013, (3): 235 -236 .  DOI: 10.3969/j.issn.1005-4979.2013.03.020