1. Center of Digital Dentistry/ Department of Prosthodontics National Center of Stomatology National Clinical Research Center for Oral Diseases National Engineering Laboratory for Digital and Material Technology of Stomatology Beijing Key Laboratory of Digital Stomatology NHC Research Center of Engineering and Technology for Computerized Dentistry Peking University School and Hospital of Stomatology Beijing 100081 China
2. State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua University Beijing 100084 China
3. Department of Biomaterials School and Hospital of Stomatology Cheeloo College of Medicine Shandong University& Shandong Provincial Key Laboratory of Oral Tissue Regeneration & Shandong Engineering Laboratory for Dental Materials and Oral Tissue Regeneration Jinan 250012 China