1. Department of Prosthodontics; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; 639 Zhizaoju Road Shanghai 200011 China
2. Shanghai Key Laboratory of Stomatology and Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology; 639 Zhizaoju Road Shanghai 200011 China
3. Shanghai Key Laboratory of Tissue Engineering; Department of Plastic and Reconstructive Surgery; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; National Tissue Engineering Center of China; 639 Zhizaoju Road Shanghai 200011 China
4. Department of Stomatology; Rui Jin Hospital; Shanghai Jiao Tong University; School of Medicine; 197 Ruijin Road II Shanghai 200025 China