1. Department of Prosthodontics, School and Hospital of Stomatology, Guangzhou Medical University, Guangzhou 510182, China
2. Key Laboratory of Advanced Technologies of Materials (Ministry of Education), School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 611756, China
3. Center of Oral Implantology, Stomatological Hospital, School of Stomatology, Southern Medical University, Guangzhou 510280, China
4. Department of Periodontology, Stomatological Hospital, School of Stomatology, Southern Medical University, Guangzhou 510280, China