1Invisible aligner technique without bracketsCHEN Song, TIAN Jie641-6432Client software of clear aligner technique:Principle and applicationXIONG Hui, CAO Yang643-6473The application of the attachment in clear removable thermoplastic appliancesGU Ze-xu, LI Bian-rong648-6524Clinic supervision in the whole treatment process of invis-ible aligner techniqueCHEN Song652-6555Indication of invisible orthodonticsCHEN Dan-peng655-6606The application of improved technique of super-rigidity slices to the research of the titanium implant-bone in-terfaceWU Xiu-ping, LI Bing, FENG Yun-xia, YAN Xiao-ping661-6637Detection and study of Fusobacteriumnucleatumin the acute exacerbation of chronic obstructive pulmonary diseaseTAN Li-si, WANG Hong-yan, ZHAO Hai-jiao, PAN Ya-ping, KANG Jian664-6678A clinical study of FR II appliance in early treatment of Class Ⅱ malocclusionFENG Cui-juan, TIAN Yu-lou, JIN Jie, ZHAO Zhen-jin, HOU Zhi-ming, ZHANG Yang668-6719The study of marginal microleakage of filling materials in vitroSUN Pei, YU Xiao-fei, ZHANG Hui, ZHAO Hong-Mei672-67510Detection of vertical root fractures of endodontically treated teeth by cone beam computed tomography versus digital radiographyZHANG Hai-ying, YAN Bo, CHU Jin-pu, CAO Xuan-ping, XU Li, JIANG Wen-hui676-67811Surgical timing for mandibular fracture:a preliminary studySUN Hong-yi, DAI Yan-ping, GONG Yu-hua679-68112Cytotoxicity experiment in vitro of two kinds of self-made nickel-chromium ceramic alloy containing titaniumKANG Xiao-Yan, ZHAN De-song682-68413Experimental study on micro-titanium nail stability of magnetic attachment of micro-titanium plateLI Zhen-chun, HAN Ri-he, XING Wen-zhong685-68714Analysis of systemic risk factors related to chronic periodontitisSONG Jia, PAN Ya-ping693-69615Application of forensic dentistryLI Bing, LIU Hong-chen697-700