1Early diagnosis and treatment of ectopic eruption of first permanent molarsLIU He705-7082The necessity and methods of early orthodontic interven-tion of preadolescent malocclusionsLI Xiao-bing709-7173Early prevention and treatment of childhood malocclu-sionWANG Sun718-7224Surgical management of vascular malformations in the oral and maxillofacial region:evaluation of 112 casesSUN Ning-ning, XU Da-peng, XUE Lei, SUN Hua-liang, XI Shan-long, WANG Xu-kai723-7265Experimental study of acoustic characteristic of vowel in normal people aged from 6 to 18GUO Mei-ling, WANG Yu-jiang727-7316Clinical application and evaluation of sonic instrumentation combined with ProTaper files in canal treatment for residual pulpitisCHEN Zhi-hong, FAN Bang-zi, ZENG Can, ZOU Jian-ming, CHEN Yu-hua, GAO Yu-feng, ZHU Fang-yong732-7347Cone beam CT for preoperative assessment in impacted mandibular third molarZHANG Shi-yan, LIU Xiu-fu, WANG Yi-bo, CHEN Shi-run735-7378Analysis of the clinical strategies in managing maxillary impacted canine of different statusYE Lu-ping, WANG Ying, WANG Lu738-7449Expression of protein and gene amplification of EGFR in oral squamous cell carcinoma and its clinical signifi-canceXIAO Ming-ming, SUN Xiao-ju, JING Shi-bing745-74810Research progress of the relationship between curve of Spee and temporomandibular disordersYU Tian-hao, ZHANG Ning, WANG Tong-hui, ZHAN De-song, ZHONG Li-fang751-75511Research progress on the application of rare earth elements in oral medicineHU Ying, ZHEN Lei, DU Yi756-75912Progress of research on the formation of new tissues after regenerative endodontic treatmentCHEN Min, ZHANG Dan-dan, CHEN Xu760-765