[1
]State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering,
Shanghai Jiao Tong University, Shanghai 200240, P. R. China
[2
]Department of Oral & Cranio-Maxillofacial Science, Shanghai Ninth People’s Hospital,
School of Medicine, Shanghai Key Laboratory of Stomatology, Shanghai Jiao Tong University,
Shanghai 200240, P. R. China