1Selection and application of basic tools for tooth extractionWANG Jing-juan, LIU Chuan, ZHANG Shu-yin, HU Kai-jinSYMPOSIUM577-5802Selection and application of tools for surgical tooth extractionLIU Ping, HU Kai-jin, MA Yang, DING Yu-xiangSYMPOSIUM581-5843Selection and use of auxiliary tooth extraction equipmentSUN Xiang-zhao, HU Kai-jin, HU Man, ZHANG Lin-lin, HOU Rui, MO Jing-zhen, XUE YangSYMPOSIUM585-587,5914Selection and application of other tooth extraction equipment and techniqueLI Guo-wei, HU Kai-jin, ZHOU Hong-zhi, LI Yong-fengSYMPOSIUM588-5915Influence of anterior esthetic evaluation form on patients' satisfaction of anterior esthetic restorationsWANG Wei, LIU Bao-gang, XIE Qiao, FENG Juan, JIA Lie-ni, HU Xiang-gang, JIA JunORIGINAL CONTRIBUTIONS592-5956Antibacterial effect of the semiconductor laser on P.gingivalis——an experimental studyWANG Dan-ning, ZHANG Yan-ting, ZHAO Bao-hong, DENG Chun-fuORIGINAL CONTRIBUTIONS596-5997Follow-up observation on the effect of fluor protector in preventing dental caries in preschool children by way of survival analysisMIAO Yu, ZHANG Shuang-yang, YU Yun-zhi, YAO Li-ying, CAO HuanORIGINAL CONTRIBUTIONS600-6048An assessment of different angulated abutments of Straumann for implant teeth in the anterior regionCHEN Xiao-xuan, LIU Guo-qiang, XU XinORIGINAL CONTRIBUTIONS605-608,6129Study on the relationship between rheumatoid arthritis and chronic periodontitisWANG Shao-feng, LIU Hai-jie, ZHAO Xin-xin, CUI You-chen, BI Ying, MIAO Pei-yangORIGINAL CONTRIBUTIONS609-61210Effect of regenerative endodontic treatment on young premolar with periapical periodontitis caused by fractured abnormal central cuspLI Yong-ji, ZHANG Ying-hua, QIN WeiORIGINAL CONTRIBUTIONS613-61711Effects of basic periodontal treatment on patients with moderate to severe periodontitis at high risk of strokeZHANG Yan-feng, SUN Xiao-ju, XIE Hong, NAN Shun-hua, XIE Hui-xinORIGINAL CONTRIBUTIONS618-62112@@622-62313Study on alveolar bone defects in orthodontic diagnosis and treatmentZHAO Huan, LIU LinREVIEW624-62714Research progress in root canal isthmusFAN Hong-xia, WEI Yan-pei, CHEN Liang, ZHANG Xue, YU Jing-taoREVIEW628-63115Application of digital smile design in prosthodontics of anterior teethSU Jia-feng, WU Feng, LUO Xiao-jinREVIEW632-63416Effect of supportive periodontal therapy on the clinical indexes in patients with chronic periodontitisZHANG Xiu, PAN Ya-pingREVIEW635-63817@@639-640 