1. Maomao Gao, MS, Department of Prosthodontics, Hospital of Stomatology Hebei Medical University, Shijiazhuang City, Hebei, China
2. Xiaoyang Guo, MS, Department of Prosthodontics, Hospital of Stomatology, Hebei Medical University, Shijiazhuang City, Hebei, China
3. Yixuan Fu, MS, Department of Prosthodontics, Hospital of Stomatology Hebei Medical University, Shijiazhuang City, Hebei, China
4. Meng Li, Hospital of Stomatology Hebei Medical University, Shijiazhuang City, Hebei, China
5. Xiaoping Ma, Restoration Technician’s Studio of Hospital of Stomatology Hebei Medical University, Shijiazhuang City, Hebei, China
6. *Zhiyu Chen, DDS, Department of Prosthodontics, Hospital of Stomatology Hebei Medical University, Shijiazhuang City, Hebei, China