1. Department of Oral and Maxillofacial Surgery, The Affiliated Hospital of Qingdao University, Qingdao 266003, China
2. School of Stomatology, Qingdao University, Qingdao 266003, China
3. Dental Digital Medicine and 3D Printing Engineering Laboratory of Qingdao, Qingdao 266003, China
4. The Climbing Peak Discipline Project of Qingdao, Qingdao 266003, China