1. Department of Prosthodontics, the Affiliated Hospital of Stomatology; Chongqing Medical University; Yubei district Chongqing 401147 China
2. Chongqing key Laboratory for Oral Diseases and Biomedical Sciences; Chongqing 401147 China
3. Department of Orthodontics, the Affiliated Hospital of Stomatology; Chongqing Medical University; Yubei district Chongqing 401147 China
4. School of Dentistry and Photon Science Institute; The University of Manchester; Higher Cambridge Street Manchester M15 6FH United Kingdom
5. Institute of Material Science and Technology; Friedrich-Schiller-University; Jena Löbdergraben 32 07743 Germany