1. Department of Dental Materials, Peking University School and Hospital of Stomatology, Beijing 100081, PR China
2. National Engineering Laboratory for Digital and Material Technology of Stomatology, Beijing 100081, PR China
3. Beijing Laboratory of Biomedical Materials, Peking University School and Hospital of Stomatology, Beijing 100081, PR China
4. Department of Stomatology, Union Hospital,
Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, PR China
5. State Key Laboratory of New Ceramics and Fine Processing,
and Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, PR China
6. Department of Polymer Science & Engineering, School of Chemistry & Biological Engineering, University of Science & Technology Beijing, Beijing 100083, China
7. Department
of Geriatric Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, PR China