1. Department of Cariology and Endodontology
2. National Engineering Laboratory for Digital and Material Technology of Stomatology
3. Peking Key Laboratory of Digital Stomatology
4. Peking University School and Hospital of Stomatology
5. Beijing 100081
6. College of Materials Science and Opto-electronic Technology
7. University of Chinese Academy of Sciences
8. Beijing 100049
9. China