1. Department of Stomatology, Zhongshan Hospital Affiliated to Xiamen University, Medical College of Xiamen University, Xiamen, China;
2. College of Stomatology, SouthernMedical University, Guangzhou, China;
3. Department of Polymer Materials and Engineering, South China University of Technology, Guangzhou, People’s Republic of China;
4. Department of Rehabilitation Medicine, First Hospital Affiliated to Xiamen University, Xiamen, Fujian Province, China;
5. Department of Endodontics, Guangzhou Medical University, Guangzhou, China