1Introduction to the new classification of periodontitisPAN Ya-ping, LIU Jing-boSYMPOSIUM2-42Clinical diagnosis and treatment of stage Ⅰ periodontitisGAO Liang, LIU Jing-boSYMPOSIUM5-93Clinical diagnosis and treatment of stage Ⅱ periodonti-tisXU Tong, ZHANG Dong-meiSYMPOSIUM10-154Clinical diagnosis and treatment of stage Ⅲ periodonti-tisWANG Jia-dai, LIN LiSYMPOSIUM16-205Clinical diagnosis and treatment of stage Ⅳ periodonti-tisCHEN Shuang-shuang, TANG Xiao-linSYMPOSIUM21-256The design and application of a periodontal osseous resective bone surgery training modelLU Rui-fang, WANG An-qi, LIU Jian, HU Wen-jie, JIA Peng-chengCOLUMN OF STOMATOLOGY EDUCATION AND RESEARCH26-307Reflections and exploration on the teaching model of phased ability improvement for periodontal refresher doc-torsLIU Kai-ning, ZHAO Yi-bing, ZHANG Yan-ling, LIU Jian, HU Wen-jieCOLUMN OF STOMATOLOGY EDUCATION AND RESEARCH31-358Effect of lithium chloride on the repair of periodontal tissue defects in SD ratsCHEN Chang-xing, XU Dan, LUO Bin-yan, YAN Fu-huaORIGINAL CONTRIBUTION36-409Study on the role of chondrocyte-exosomes in abnormal calcification of cartilage in temporomandibular joint osteoarthritis in ratsHOU Shu-jie, WANG Liu-xin, GUO Feng, YUAN Wen-xuan, YE Tao, YANG Fan, ZHANG Mian, WANG He-linORIGINAL CONTRIBUTION41-4610Experimental study on the effect of double-foil clear aligners of different loading time on orthodontic tooth movementWANG Shi-zhe, CHU Feng-ting, FENG Qi-ping, YANG Yi-ming, PAN Xiao-gang, CHEN Rong-jingORIGINAL CONTRIBUTION47-5211Application of three-dimensional reconstruction of tooth crown and root with digital models in oral clinicLI Su-na, ZHANG Yi, WEI Qing, CAI Hong-danORIGINAL CONTRIBUTION53-5812Clinical application of concentrated growth factors in autotransplantation of teethLI Yun-yi, LIU Guo-liang, ABDOUKIMU Raysa, JIANG Chun-yan, WUROUZI Guli, MOMING Adili, WANG LingORIGINAL CONTRIBUTION59-6513Clinical effect of digital surgical template in removing fracture implant in boneZHANG Chong, DENG Chun-fu, ZHAO Bao-hongORIGINAL CONTRIBUTION66-6914Analysis of the skeletal morphology and position of condyle in skeletal class Ⅲ high angle combined with man-dibular deviation based on cone-beam CTZHOU Lin-xi, ZHANG Xing-zhu, FANG Bing, ZHANG Gui-rongORIGINAL CONTRIBUTION70-73,8015Effects of berberine on MAPK/ERK signal pathway and odontogenic differentiation of dental pulp stem cellsBI Lei, LIU Hui, WU RanORIGINAL CONTRIBUTION74-8016Study on the correlation between the evaluation of dysphagia and early prognosis in patients with oral cancer after surgeryWANG Na, TAN Li-shuang, LI YuORIGINAL CONTRIBUTION81-8417Research progress in gingival papilla recession after orthodontic treatmentXIA Meng-jiao, ZHOU Li-li, YUAN Wen-lin, YANG Yu-ting, CHEN Li-liREVIEW85-9218Research progress of keratinized gingiva around dental implantsREN Jie, LI Miao, REN Xiu-yunREVIEW93-9719Research progress in the antibacterial properties of new anti-bacterial agents against Porphyromonas gingivalisCHEN Shuang-shuang, YU Jing-jun, TANG Xiao-linREVIEW98-10320Development status of impression technique of complete dentureXU Min, ZHANG Yan, ZHANG Yu-meiREVIEW104-110 