1Study of tooth regeneration(continued)YU Jin-hua, SHI Jun-nan, JIN Yan429-4352In situ hybridization research of USF1 mRNA expression in mouse tooth developmentWU Li-an, WEN Ling-ying, YANG Fu-sheng, Wang Xiao-jing436-4383The effect of prostaglandin E2 on the expression of receptor activator of NF-κB ligand mRNA and osteoprotegerin mRNA in human periodontal ligament fibroblastsREN Li, QIU Song-bo, TAN Ying-hui, He Fei439-4434Prevalence of Tannerella forsythensis in relation to periodontal statusYANG He, ZHAO Lei, MENG Shu, WU Ya-fei, FU Chun-hua, ZHAO Huan, XU Yi444-4475Association of vitamin D receptor gene fokⅠpolymorphism with moderate to severe chronic periodontitis of han nationalityLI Sheng, YANG Ming-hua, WANG Yu-cai, WU Wen-lei, HUANG Xiao-feng, QIAN Hai-feng448-4516Experimental study on the inhibitory effect of decoction of Bletille striata Reichb.f to Streptococcus mutansCHEN Yu, ZHANG Xiao-fang, ZHU Jian-dong452-4547Relationship between attachment loss and improved solid BANA TestYAN Wen-juan, XUE Yi, LI Xiang-fei, XIN Yu-hua455-4578In vitro evaluation of the antimicrobial activity of nanomaterialLIU Zhi-dong, REN Ji-fang458-4629Microleakage and nanoleakage of resin-dentin interfaceZHAO Xin-yi, YIN Hong, LIU Fang, WANG Jun-cheng463-46610Aassociations between early childhood caries ,diet, oral hygiene and parental attitude of oral hygiene.WEI Li-min, WANG Jian-feng467-46911Effects and progress of xenographic bone graft on periodontal bone defects.CHEN Tie-lou, LIU Guo-qin, WU Zhi-fen, ZHOU Yi-jun481-48412The effective of cytokines on periodontal disease and chronic obstructive pulmonary diseaseLV Pin, GAO Jin-fu485-488