1Orthodontic treatment and periodontal maintenance for patients with periodontal diseasesZHANG YangSYMPOSIUM449-4532Orthodontic considerations of temporomandibular disordersZHANG DanSYMPOSIUM453-4573Influence of miR-15b on Cal27 proliferation and apoptosis in oral squamous cell carcinomaGUO Yan, SHANG Chao, REN Mei-si, SONG Rong-bo, ZHONG MingORIGINAL CONTRIBUTIONS458-4604A 3D finite element study of upper dentition under retractive forceDENG Yi, ZHANG Xiao-rong, YAO JiORIGINAL CONTRIBUTIONS461-464,4695A CBCT study of the alveolar bone thickness of the maxillary first molar in normal occlusion with different growth patternsTIAN Hai-ying, SHI Sheng-gen, LIU Dong-xuORIGINAL CONTRIBUTIONS465-4696Aesthetic effect of early single-tooth implants in the anterior maxillaLIU Wei-li, ZHANG Ying-qi, SUI Li-naORIGINAL CONTRIBUTIONS470-472,4777Study of apical sealing ability of the Elements Obturation Unit system in vitroWU Hong-bin, SUN De-gang, CHEN Xi, JIA JingORIGINAL CONTRIBUTIONS473-4778Analysis of bracket base remnant after removing brackets of different basesLIU Yang, SHAO Ping, CAO Yu-jiaoORIGINAL CONTRIBUTIONS478-4809Application of modified transpalatal arch to the vertical controll: a clinical studyWANG Hai-yan, HE Lin, GE Ling-ling, XIAO Cong, LI XinORIGINAL CONTRIBUTIONS481-48410Applications of Er∶YAG laser in labial frenectomy.QU Wei-dong, SHANG Jiang, DU Ping-gong, SONG Jian, LIU Zhong-haoORIGINAL CONTRIBUTIONS485-48811The comparison of air-polishing application in fixed orthodonticsLIU Wei-jian, TANG Xiao-lin, MA Chun-Liang, ZHANG Fu, ZHAO Yu-ying, YU Na, LIU DanORIGINAL CONTRIBUTIONS489-49212Development of the research on facial asymmetry evaluationLI Wen-yan, DUAN Yi-fengREVIEW493-49613Dentin hypersensitivity: research progress in medicationCHEN Li-weiREVIEW497-50214Study on correlation between the third molar and malocclusionCHEN Juan, AN YangREVIEW503-50715Research progress of endodontics microsurgery for chronic apical periodontitisLI XiaoREVIEW508-51216@@488,492 