1. National Engineering Laboratory for Digital and Material Technology of Stomatology NMPA Key Laboratory for Dental Materials & Beijing Laboratory of Biomedical Materials Department of Geriatric Dentistry Peking University School and Hospital of Stomatology Beijing 100081 P. R. China
2. National Engineering Laboratory for Digital and Material Technology of Stomatology NMPA Key Laboratory for Dental Materials & Beijing Laboratory of Biomedical Materials Department of Geriatric Dentistry Peking University School and Hospital of Stomatology People's Republic of China. Peking University Health Science Center and Hospital of Stomatology Beijing 100081 P. R. China
3. Department of Stomatology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 P. R. China
4. Peking University Health Science Center and Hospital of Stomatology Beijing 100081 P. R. China