1. Department of Oral and Maxillofacial Surgery, Ninth People's Hospital, School of Medicine, Shanghai JiaoTong University, Shanghai, P. R. China.
2. Department of Stomatology, Sixth People's Hospital, Shanghai JiaoTong University, School of Medicine, Shanghai, P. R. China.
3. Department of Oral Anatomy, College of Stomatology, Shanghai JiaoTong University, School of Medicine, Shanghai, P. R. China.
4. Oral Bioengineering Lab, Department of Prosthodontics, Shanghai Research Institute of Stomatology, School of Medicine, Ninth People's Hospital, Shanghai JiaoTong University, Shanghai, P. R. China.
5. Key Laboratory for Ultrafine Materials of Ministry of Education, East China University of Science and Technology, Shanghai, P. R. China.
6. Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai, P. R. China.