1Overview of periodontal surgical therapyPAN Ya-ping, LIU Jun-chaoSYMPOSIUM321-3242Role and general conditions of periodontal surgeryYIN Yuan-zhengSYMPOSIUM324-3273Enforce the procedure of surgical professionally to promote the achievement ratio of periodontal surgeryLIU Xiao-fengSYMPOSIUM327-3334Clinical application of periodontal osseous surgeryXU YanSYMPOSIUM334-3385Application of piezosurgery device to oral surgeryLIN Li, LANG Li-yunSYMPOSIUM338-3406Fracture in NiTi instruments: classification and preventionPENG BinEXPERT EXPERIENCE341-3447A study of tissue engineered periodontal ligament based on chitosan-silk fibroin-tricalcium phosphateLIU Yang, ZHAO BinORIGINAL CONTRIBUTIONS345-3478Maxillary protraction on the development of the facial soft tissues in patients with skeletal Class Ⅲ malocclusionLI Xia, SHI HanORIGINAL CONTRIBUTIONS348-3509Clinical research on bolt post and crown in restoration of residual root and crown in patients with tight occlusionFU Zhen-nan, ZOU Kang-yuan, CHEN Ru-na, DUAN Chang-huaORIGINAL CONTRIBUTIONS351-35310Clinical research of using fibrous glass root canal dowel internal fixation to cure anterior teeth root fractureHAN Qi-qing, SONG Yong-hai, WANG Zhi-gang, CHE Zong-gang, WANG Ye-gangORIGINAL CONTRIBUTIONS354-35611Position change of mandibular third molar after extraction or non-extraction orthodontic treatment in patients with Class Ⅱ1 malocclusionYAO Shuang, YANG Shuang, LIU Xiao-jun, YANG PingORIGINAL CONTRIBUTIONS357-35812Comparison of two methods of closing the extraction space using straight wire applianceWANG Song, QIN KeORIGINAL CONTRIBUTIONS359-36113Comparison of the curative effect of Hawley retainer with that of vacuum formed retainerWANG Lin, DING Shao-hua, ZHANG Hai-qiangORIGINAL CONTRIBUTIONS362-363,36614The curative treatment evaluation of the method of employing maxillary protraction with the help of maxillary removable appliance to cure crossbites of 26 cases during the dental transitional periodYU Xian-jiangORIGINAL CONTRIBUTIONS364-36615Research on postoperative sensitivity of wedge-shaped defect by different adhesive systemsZHAO lian-jiu, LI Yu-guangORIGINAL CONTRIBUTIONS367-36816Influence of psychological intervention on complete denture satisfactionWANG Guang-junnORIGINAL CONTRIBUTIONS369-37017Survey of dental caries and periodontal health in 12-year children in Shenhe district of the city of ShenyangZHU Bing-lin, WANG LiBRIEF ORIGINAL CONTRIBUTIONS371-37218Evaluation on the effect of Vitapex paste applied to pulpotomy for young permanent molar pulp exposureBRIEF ORIGINAL CONTRIBUTIONS372-37319Function of autophagy gene Beclin 1 in tumor and its relationship with oral cancerWANG Ya-wenSUMMARY374-37620Research advance of nickel-titanium instrumentsWANG FenSUMMARY377-382 