1. Department of Periodontology Peking University School and Hospital of Stomatology Beijing China
2. National Clinical Research Center for Oral Diseases Beijing China
3. National Engineering Laboratory for Digital and Material Technology of Stomatology Beijing China
4. Beijing Key Laboratory of Digital Stomatology Beijing China
5. First Clinical Division Peking University School and Hospital of Stomatology Beijing China
6. Department of Physiology and Pathophysiology Peking University Health Science Center Beijing China