Analysis of contributing factors for gingivial black trangle after non-extraction orthodontic treatment of crowded mandibular anterior teeth
ZHANG Kejia, SHI Xueming, HU Danyan, QIAN Xinyao, LIU Luwei, CAO Dan, YAN Bin
Stomatology . 2023, (6): 518 -523 .  DOI: 10.13591/j.cnki.kqyx.2023.06.007