1Activated irrigation technique and application strategy in root canalCONG Xin-yu, WANG Si-qi, XUE MingSYMPOSIUM129-1332Morphology and identification of C-shaped root canalsWANG Si-qi, CONG Xin-yu, XUE MingSYMPOSIUM134-1373Mechanical root canal instrumentation and dentinal mi-crocracksWANG Zi, XU Wan-qian, XUE MingSYMPOSIUM138-1424Root canal obturation techniquesXU Wan-qian, WANG Zi, XUE MingSYMPOSIUM143-1475Application of dynamic navigation technology in pulp treatmentLIU Si-min, WANG Zu-huaSYMPOSIUM148-1516Practice and reflection on the periodontal preclinical training of dental undergraduate studentsZHEN Min, YANG Gang, HU Wen-jie, KANG Jun, ZHAO Yi-bing, FENG Xiang-hui, LIU JianCOLUMN OF STOMATOLOGY EDUCATION AND RESEARCH152-1567Retrospective investigation of periodontal internship status of the trainees in standard resident training during undergraduate period and exploration of coping strategiesZHANG Yan-ling, ZHANG Hao-yun, HU Wen-jie, LU Chang, CAO Jie, GAO Li, XIE Ying, LIU JianCOLUMN OF STOMATOLOGY EDUCATION AND RESEARCH157-1608Irrigation effectiveness of removing smear layers with Er∶ YAG shock wave enhanced emission photoacoustic streaming:an in vitro studyHE Xin-yu, LIN Xin-xin, LI Yi-zhou, WANG Zhong, ZHAO Ji-zhiORIGINAL CONTRIBUTION161-1659Clinical evaluation of demineralized freeze dried bone allografts in combination with concentrated growth fac-tor in the treatment of periodontal intrabony defectsZHAO Jun-wei, WANG Yong, HAN ShuangORIGINAL CONTRIBUTION166-17010Effect of two abnormal occlusion stimulations on the imaging and histomorphology of mice mandibular con-dyleXU Xiao-jie, LIU Qian, ZHANG Yue-jiao, WANG Shuang, ZHOU Peng, WANG Dong-mei, WANG Mei-qingORIGINAL CONTRIBUTION171-17611Biological behavior of rat bone marrow mesenchymal stem cells affected by Porphyromonas gingivalis lipopoly-saccharideLUO Bin-yan, CHEN Chang-xing, YAN Fu-huaORIGINAL CONTRIBUTION177-18212Construction and evaluation of prognostic risk scoring model based on tumor microenvironment of HPV-nega-tive head and neck squamous cell carcinomaZHANG Ze-ying, PANG Pai, XUE Xiao-meng, ZHOU Lu, WANG Yao, SUN Chang-fuORIGINAL CONTRIBUTION183-189,19513Analysis of the difference between three-dimensional and two-dimensional measurements based on Steiner and Tweed analysisLU Zhi-yao, JIAO Er-long, DANG Liang-sheng, JIN Zuo-linORIGINAL CONTRIBUTION190-19514Effects of the cervical headgear in improving soft tissue profile of adolescents with skeletal class Ⅱ malocclu-sionZHOU Lin-xi, FANG Bing, ZHANG Gui-rongORIGINAL CONTRIBUTION196-198,20315Clinical effect evaluation of grading management of dental caries in 3-year-olds in Shanghai based on risk as-sessmentYI Fang-yu, ZHANG Hao, ZENG Xiao-li, JIANG Yi-wei, YU Jin, DA Dong-xin, WANG Hu-ning, YU Ying, WENG Qing-qing, ZHANG YingORIGINAL CONTRIBUTION199-20316Clinical observation of ozone gel therapy after removal of impacted mandibular third molarGU Chun-mei, ZHOU Bing-rong, WEI Min, LI Shu-yuanORIGINAL CONTRIBUTION204-206,21517Incomplete caries removal for deep caries:a systematic review and Meta-analysis of the clinical effectLYU Sheng-shen, MA Lan, YIN Jing-jing, YU Yi-jun, MIAO Lei-yingORIGINAL CONTRIBUTION207-21518Research progress of enamel matrix derivatives in stomatologyWANG Zhong-shan, REN Zi-longREVIEW216-21919Research progress in the application of stem cells from human exfoliated deciduous teeth in tissue regeneration and immunological regulation in oral-maxillofacial regionCHEN Ning-xin, LAI Guang-yun, WANG JunREVIEW220-22420Research advances of prognosis of replanted avulsed toothLIU Jia-jia, DU Yang, DI Tian-kai, LU Xiao-xi, WANG Xiao-jingREVIEW225-228,233 