1Preliminary exploration of medical quality management system in oral comfort clinicLI Fang-fei, LUO Shu-mei, ZHAO Yu-qi, YU CongSYMPOSIUM648-6502Quality management of quality nursing in painless outpatient department of stomatologyWANG Yuan-yuan, CHEN Shou-hui, YU Cong, ZHAO Yu-qiSYMPOSIUM651-6543Effect of orally administered Porphyromonas gingivalis on intestinal inflammation in miceDAI Ke, WANG Wei-ru, YANG Qin-bo, LIU Ni, LIU Jie, KOU Yu-rongORIGINAL CONTRIBUTIONS666-6704Stress analysis of mandibular first molar with different bottom thickness repaired by lithium disilicate ceramic onlayGAO Zhi-yin, WEI Zhen-hui, SUN He-ting, WANG Jin-hai, ZHANG Peng, WANG Wei, TAN Nai-wenORIGINAL CONTRIBUTIONS671-6765Research progress on the relationship between obstructive sleep apnea hypopnea syndrome and oral diseasesSHI Xiao-tong, WANG Xiang-yu, LIU Jun-yu, HOU Ru-xiaREVIEW684-6886Research progress of the relationship between Spee curvature and age as well as craniofacial morphologyZONG Li-na, WANG Xiao-qinREVIEW694-697