1. Department of Orthodontics, School of Dentistry, Seoul National University, Seoul, Korea.
2. Department of Mechanical System Engineering, Hansung University, Seoul, Korea.
3. Future Convergence Research Division, Korea Institute of Science and Technology, Seoul, Korea.
4. Department of Materials Science & Engineering, Chungnam National University, Daejeon, Korea.
5. Dental Research Institute, Seoul National University, Seoul, Korea.