1. NMPA Key Laboratory for Dental Materials National Engineering Laboratory for Digital and Material Technology of Stomatology Department of Geriatric Dentistry Peking University School and Hospital of Stomatology Beijing 100081 P. R. China
2. The School of Chemistry and Chemical Engineering South China University of Technology Guangzhou Guangzhou 510640 P. R. China
3. Stomatological Hospital Southern Medical University Guangzhou 510280 China
4. Central Laboratory Peking University School and Hospital of Stomatology Beijing 100081 P. R. China
5. State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China
6. Department of Physics Beijing Normal University Beijing 100875 China
7. Department of Stomatology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 P. R. China