1Construction and expression of the fused Vector of Lactate dehydrogenase of Streptococcus Mutans and cholera toxin B subunitZHANG Yan, LIU Jian-guo, CHEN Zhu, MA Xin-rong, TANG Ling, WU Jia-yuan, ZHANG Jian, GUAN Xiao-yan371-374,4062Evaluation of the number of roots and canals of mandibular first permanent molars in a northwestern Chinese population by cone-beam computed tomographyLIU Xiao-jing, YANG Bo, HAO Jin-hui, BAI Qing-xia, ZHANG Yan, LIU Xiao-yan, LU Qun375-3783Effects of three root canal filling methods on lateral root canal filling in first mandibular premolars: an in vitro studyQI Lu, WANG Xing, WU Pei-ling379-3814The influence of fluor protector on the remineralization and bacterial adherence of the tooth after cold light bleachingLIU Qian, DONG Qin, WANG Lin, BAI Yu-hong382-3855Injury evaluation of ProTaper nickel-titanium rotary instruments and hand instruments after preparation of moderately curved canals in vitroYAN Wen-juan386-3906Expression of human beta-defensins in dental pulpWANG Li-li, WANG Qing, ZHOU Li-li391-3947Biocompatibility assessment of two dental bonding agents with a rat tooth organ culture modelZHANG Jin-yan, LEI Gang, YU Jin-hua, ZHANG Guang-dong395-3988Clinical evaluation of restoration of posterior residual crown in low occlusogingival distance with fiber fission post onlayLIU Xiang-ning, ZHOU Lei, LAI Ren-fa, XIE Li, LI Shao-bing, ZHANG Ye, XIONG Kun399-4039Effects of ultrasonic scaling and flap surgery on the treatment of mandibular furcationCHEN Li, XIAO Chun-hua, SONG Hong, LV Xin, LI Feng404-40610Preliminary study on the treatment of anterior crossbite in the mixed dentition with invisible applianceXU Hong-jun, WANG Feng407-40911Effect of root canal lubricant on the detection of intra-canal bacteriaFAN Xiao-min, ZHANG Xiao, JIANG Yong410-411,41512Longitudinal observations of chronic periodotitis patients duing maintenance therapyLAN Qian, HAN Lu, HUANG Ping412-41513Effect of oral health instruction during pregnancy on the oral health of pregnant womenLIANG Jian-qiang, WU Sheng, CHEN Chun-yan416-41814Application prospects of angiogenesis in periodontal wound healingDING Jin419-42215Clinical application of ethylene diaminete tetraacetic acid suspension concentrate in dentistryZHANG Rong-de, ZHON Yan-ni423-42616An "integrated" teaching method for periodontology:Perspective from the National Dentist Qualification TestLI Han-wei, LI Yong-mei, HUANG Xiang-dao, ZHANG Li-hua, GUO Jing427-428 