1Construction of LuxS-deleted Streptococcus mutans and biofilm formation property of the LuxS-deleted strainZHANG Yao-chao, HAN Yu-zhi, HAN Fu-sheng309-313,3222Effect of double abutment absorption of alveolar bone in rigid fixed bridge on the stress distribution of abutmentsZHANG Ying, LIAO Mu-ying, WU Xian, ZHANG Yi-ling, CHEN Yan314-3183Expression of bone sialoprotein in the process of implant-bone interface remodeling with different implantsYUAN Lin, CAO Kai-hua, TONG Xin319-3224Properties of human gingival fibroblasts cultured on chitosan-gelatin-carrageenan scaffold in vitroSUN Lu, YANG Bo-guang, WANG Yong-lan, YAO Fang-lian323-326,3295Expression of bFGF during rat tooth germ developmentHUANG Xin, YUAN Jie, LI Lei, ZHANG Lei, ZHANG Xiao-dan, SUN Xiang-yun327-3296Root cancal preparation effects of two Ni-Ti instrumentation systems:a comparative studyYAN Wen-juan, XIE Miao-miao, WU Bu-ling330-3347Relationship betwcen Porphyromonas gingivalis and periodontal status of orthodontic patientsGUO Yang, ZHANG Yun-kui, ZHANG Yu-jie, XIAO Shui-qing335-3388Biocompatibility of α-TCP brushite bone cement materialMA Jian-min, YANG Hong, WANG Kai, LIU Can, ZHAO Hui-juan339-342,3189Deciduous teeth caries status and impact factors in a 5 year old Guangxi cohortLI Xiao-jie, HUANG Hua, HUANG Gao-ming, HE Ke-xin343-34610Influence of dental fear on patient behavior and oral care needsCHENG Fan-ping, WU Yu-hai, FENG Jin-lan, GAO Ci-feng347-35011Accuracy of two root canal length measurement devices integrated into rotary endodontic motors in retreatment teethCHEN Li-Sen, CHEN LI-li, SUN Yong, FAN Jie, QI Chun-zi351-353,35012A clinical randomized controlled trial of posterior teeth matrix systemLIANG Rui-zhen, HU Ming, WU Jing-tao, WU Da-ming, WEI Ting, WU You-nong354-356,34613The clinical application of improved Quad-Helix appliance——110 case reports of complex malocclusionWU Qian-qian, ZHAO Cui-zhi, KE Jie, LI Xiao-fei, XU Nuo, ZUO Kai, JIA Cheng-Iiang357-36314Application of headgear facebow in high-angle crowded casesZHANG Qiong364-366,36315Antimicrobial activity of magnolia against oral pathogensLIU lin368-370,363