1. College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, China
2. Department of Oral and Maxillofacial Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
3. Key Lab of Oral Clinical Medicine, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China