1. Department of Prosthodontics, The Affiliated Hospital of Qingdao University, Qingdao 266000, Shandong, China
2. School of Stomatology, Qingdao University, Qingdao 266000, Shandong, China
3. Dental Digital Medicine & 3D Printing Engineering Laboratory, Qingdao University, Qingdao 266000, Shandong, China
4. Department of Oral and Maxillofacial Surgery, The Affiliated Hospital of Qingdao University, Qingdao 266000, Shandong, China
5. Department of Biomedical Engineering, Tufts University, Medford, Massachusetts 02155, United States