1The use of the operating microscope in complicated root canal treatmentHOU Ben-xiang, ZHANG Chen, ZHANG Hai-yingSYMPOSIUM513-5182Clinical key-points about fine and curved root canal preparationZHU Ya-qinSYMPOSIUM518-5213The anatomical characteristics of C-shaped canal and its treatmentFAN Bing, WU HaoSYMPOSIUM521-5244Problems and solutions in root canal retreatmentYAN PingSYMPOSIUM524-5285Clinical application of nickel-titanium rotary instrumentsYU Jing-tao, LIU YangSYMPOSIUM528-5316Research of bonding strength of fiber posts bonding with three different resin adhesive systemLIU Li, CHEN Xiao-dongORIGINAL CONTRIBUTIONS532-5357The effect of orthodontic treatment on the morphology of temporomandibular joint in adults with high-angle Class II malocclusionsYANG Shuang, YAO Shuang, LIU Xiao jun, ZHOU ZhiORIGINAL CONTRIBUTIONS536-5388Comparison study on clinical effect of gingival retraction cord and Er:YAG laser gingival retraction techniquesZHANG Min, HU Jian-hua, ZHAO Bin, YAO WeiORIGINAL CONTRIBUTIONS539-5409Effects of lactational 2,3,7,8-TCDD exposure to changes of ultrastructural observation of tooth in SD rat offspringGENG Hua-ou, ZHANG Jin-caiORIGINAL CONTRIBUTIONS541-54310Changes of IL-6 level in gingival crevicular fluid and serum before and after periodontal treatment in postmenopausal womenWANG Xiao-yan, GENG Fa-yun, LI Hong-wen, JIANG Jing, DU Rai-tianORIGINAL CONTRIBUTIONS544-54511Detection of rag genotypes of Porphyromonas gingivalis with multiple PCRZHANG Yu-jie, GUO Yang, ZHANG Jin, MAO Chun-mei, XIAO Shui-gingORIGINAL CONTRIBUTIONS546-54912Periodontal implication of Damon3 self-ligating bracketsDENG Yi, ZHANG Xiao-rongORIGINAL CONTRIBUTIONS550-55113Clinical application of combined radical operation to carcinoma of tongue and carcinoma of floor of mouth in retaining aveolar of mandibleDUAN Wei-yi, XU Zhong-fei, ZHU Wei, DAI Wei, LI Rui-wu, GE Shu-fen, SUN Chang-fuORIGINAL CONTRIBUTIONS552-55314Research into the safe zones of micro-implant anchorage positioning alveolar bone in maxillary anterior regionZHAO Yan, WU PingORIGINAL CONTRIBUTIONS554-55615Research advance in the establishment of dental implant electronic medical recordGAO Yan-meiSUMMARY561-56316Oral disease of Tibetan population and the high altitude-interrelatedDU Qi-lianSUMMARY564-56617Research progress of Cohen cephalometric analysisLIU Xue-lingSUMMARY567-569 