Journal of Oral Science Research
Mandibular First Molar with Four Distal Canals: A Case Report
FANG Yanjun, XUAN Hansheng, PAN Wan, LIANG Shanshan, MENG Liuyan
Journal of Oral Science Research . 2019, (8): 814 -816 .  DOI: 10.13701/j.cnki.kqyxyj.2019.08.022