1Convenience form preparation in root canal therapy and control of mechanical preparation complicationsZHAO Jing-wen, XUE MingSYMPOSIUM513-516,5212Etiology and diagnostic key points of vertical root frac-tureWANG Zi, XU Wan-qian, XUE MingSYMPOSIUM517-5213Sealing ability of bioceramic root canal sealersXU Wan-qian, WANG Zi, XUE MingSYMPOSIUM522-5254Management of the mental nerve during endodontic mi-crosurgery in the posterior mandibular regionPANG Xian-zhuo, XUE MingSYMPOSIUM526-5295Consideration of the clinical significance of apical fora-men patencyZHANG Wen-shuo, XUE MingSYMPOSIUM530-5336Root canal preparation methods for teeth with open apexCEN Yu, YANG DiSYMPOSIUM534-5397A study of the cleaning effect of different root canal irrigation methods and irrigation time on root canal isth-musLUO Wen, ZUO Wen-xin, WEN Chao-ying, ZHU Jing-ya, HUANG Ri-hong, ZENG Xiang-ni, HE FeiORIGINAL CONTRIBUTION540-5468Characteristics of smear layer of dentin prepared by two burs and their effects on bonding strength of universal adhesive systemsGE Mi-xue, ZHAO Meng-jun, YANG Yan-jingORIGINAL CONTRIBUTION547-5539Effect of apical resection length and crown-root ratio on prognosis of apical cyst managed by endodontic micro-surgeryPAN Meng-qi, LI Zhi-yongORIGINAL CONTRIBUTION554-55910Clinical study of micro-osteoperforations for adult orthodontic treatment with tooth extractionZHANG Xiu, MA Yan-fei, WANG Ying-ying, CHEN BinORIGINAL CONTRIBUTION560-56311Prevalence of alveolar dehiscence and fenestration in patients with skeletal Class Ⅲ malocclusion by using cone beam CTZHANG Yi-fan, SUN Jia-zhen, WANG Yu-li, WANG Shu-jun, ZHAO Zhen-jinORIGINAL CONTRIBUTION564-569,57412Study on the effect of artificial saliva on residual white spot on tooth enamel after treatment by infiltration resinJIANG Bo, ZHANG Jian, ZHANG Wen-yiORIGINAL CONTRIBUTION570-57413Analysis of the adverse effects of oral treatment in children under general anesthesia and the influencing factorsFAN Jing, GU Ya-nan, ZHAO Jin-rong, LIN MeiORIGINAL CONTRIBUTION575-57914Systematic review of the incidence rate and influencing factors of sharp instrument injury in dental medical staffZENG Jiang, CHEN Piao-piao, HONG Fei-ruo, YU Xue-fenORIGINAL CONTRIBUTION580-58415Analysis of the prevalence and the influencing factors of the tooth loss and restoration needs in Chinese adultsLIU Ruo-ying, ZHANG Shan-shan, SI Yan, ZHENG Shu-guoRESEARCH COLUMN OF ORAL HEALTH SURVEY585-59716Investigation on self-evaluation of scientific research ability in stomatological postgraduatesTAN Xue-lian, NI Wei-gui, SUN Yi-min, ZOU Xu, JIN You-shun, PENG Jia-li, WANG JunCOLUMN OF STOMATOLOGY EDUCATION AND RESEARCH598-60317Exploration and practice of systematic stepped training in jaw reconstructionZHANG Shi-jian, WANG Lei, YANG Xi, HU Long-wei, ZHANG Zhen, LI Si-yi, ZHANG Chen-pingCOLUMN OF STOMATOLOGY EDUCATION AND RESEARCH604-60818Research advances in occlusal contact analysis methodsLI Jia-le, ZHAO Zhe, WANG Qing, TANG Kai, WANG FuREVIEW609-61419Research progress of customized labial orthodontic techniquesMENG Qian-jiao, SHEN Qun, CHEN Yu-cheng, ZHANG Hui, DING Meng, GE Fei-fan, WU Jian-huaREVIEW615-61820Research progress on the evaluation methods of dental implant stabilityLI Kang-jie, LIU Yu-chen, LIU Heng-yan, TIAN Min, NIU Li-na, FANG MingREVIEW619-623 