1Treatment for recurrent aphthous ulcer with low level laser therapyZHANG YingSYMPOSIUM257-2622Laser application in oral and maxillofacial surgeryZHAO Ji-zhi, KONG Ya-QunSYMPOSIUM262-2653Use of laser in dental estheticsWANG Zuo-minSYMPOSIUM266-2704Study of the effect of tooth movement at different time after the repair of alveolar bone defectsZHENG Min-qian, HUANG Peng-cheng, ZHANG Duan-qiangORIGINAL CONTRIBUTIONS271-2735Clinical research of upper airway sagittal dimension and the position of hyoid in non-extraction patients with Angle's Ⅱ1 malocclusionJIANG Zi-xi, ZHENG Bo-wen, AN Na, CAO Shan, BAO Yang, LIU YiORIGINAL CONTRIBUTIONS274-2776The analysis of Angel's Class Ⅱ deep overbite malocclusion with non-reduction treatments using microscrew anchorage and fixed bite flatWEN Xing-tao, MIAO Yao-qiang, CAI Shao-bin, LI Dong-jian, MIAO Hui-tingORIGINAL CONTRIBUTIONS278-2827Comparative study of Straumann SLA and Straumann SLActive single-tooth implant on resonance frequency analysis in the posterior maxilla and mandibleHUANG Hui, WEI Ya-qin, LIU YanORIGINAL CONTRIBUTIONS283-285,2898A comparison of prosthetic outcomes of screw and cement with cement-retained implant-supported restorations in the posterior regionZHOU Cheng-yuan, LIU Jie, XIA Jun-nan, QIN Hong-wei, SUN Ming-xu, YANG Jian-junORIGINAL CONTRIBUTIONS286-2899Three-dimensional dentofacial characteristic analysis in Class Ⅱ subdivision malocclusionXU Jing, ZHU Shuang-lin, PAN Yu, PENG Wen-bo, WANG YangORIGINAL CONTRIBUTIONS290-29310The influence of different rehabilitation methods for adolescent permanent anterior teeth defects on occlusion systemZHENG Shu-zhen, ZHAO Pei-duanORIGINAL CONTRIBUTIONS294-296,30111Effect of lithium chloride on cognitive ability of aged rats after oral and maxillofacial surgeryZHANG Lun-qiang, LI Shu-tao, HE Xiao-fan, JIN Xian-yu, ZHANG QianORIGINAL CONTRIBUTIONS297-30112Effect of diabetes mellitus on tooth wear in rat molarsYAN Lu, FU Yue, SUN Shang-min, PAN Ya-pingORIGINAL CONTRIBUTIONS302-304,30813Research into the relationship between Angle's Ⅱ1 malocclusion and vertical alveolar resorptionJI Juan-juan, YAO Shuang, ZHOU Zhi, LIU Xiao-jun, YANG Shuang, SHEN YongORIGINAL CONTRIBUTIONS305-30814Response of osteoblast-like cells cultured on zirconia to transforming growth factor β1ZHANG Ran, REN Guang-hui, LI Lei, TENG Teng, LIU Zhong-haoORIGINAL CONTRIBUTIONS309-31215Research advance of nickel-titanium instruments for root canal preparationQIU NingREVIEW313-31616Properties of nanoceramics and its application in stomatologyLI HaoREVIEW317-320 