1. Faculty of Dentistry and Research Unit in Mineralized Tissue Reconstruction, Thammasat University (Rangsit Campus), Pathum-thani 12121, Thailand
2. National Metal and Materials Technology Center, National Science and Technology Development Agency, Khlong Luang 12120, Thailand
3. Division of Biomaterials & Tissue Engineering, UCL Eastman Dental Institute, Royal Free Hospital, Hampstead, London NW3 2PF, U.K.