1Clinical efficacy of periodontal regenerative surgery and flap surgery with osteoplasty in the treatment of periodontitis: one case reportSHI Yu-tong, WANG Cui, HU Wen-jie, WANG Hao-jieColumn for Special Surgery of Periodontal Soft and Hard Tissues129-1382Evaluation of dental implants following ridge preservation in molar extraction sockets affected by advanced periodontitis: a 3-year follow-up of one caseLI Li-man, ZHAO Li-ping, XU Tao, HU Wen-jie, LIU Yun-songColumn for Special Surgery of Periodontal Soft and Hard Tissues139-1453Preliminary study of the vestibular incision subperiosteal tunnel access combined with subepithelial connective tissue graft in the treatment of multiple adjacent Miller class Ⅰ gingival recession : a case analysisWEI Ning, WANG Cui, YANG Gang, HU Wen-jieColumn for Special Surgery of Periodontal Soft and Hard Tissues151-1564Effect of different surface treatment on the bond strength of Hyramic to resin cementDU Ya-xin, WANG Qiang, QIU Li-hongORIGINAL CONTRIBUTIONS157-1615Study on the relationship of upper airway morphology and hyoid bone position with cranial and maxillofacial bone morphology in patients with skeletal class ⅡMA Yu-ze, WANG Xiao-qinORIGINAL CONTRIBUTIONS169-1736Research advances in the bioceramics application in tissue repair and regeneration of maxillofacial bone defectsZENG Jian-hong, LIU Yao, CHEN XuREVIEW174-177,1837Research advances in the application of Er laser in caries managementDU Qing, WANG Xiao, ZHANG SunREVIEW178-183