1. Department and Research Institute of Dental Biomaterials and Bioengineering, College of Dentistry, Yonsei University
2. Department of Dental Technology, School of Medical and Public Health, Kyungdong University
3. Central Dental Laboratory, Dental Hospital of Yonsei University
4. School of Mechanical Engineering, Korea University
5. Department of Dental Biomaterials and the Institute of Biomaterials and Implant, College of Dentistry, Wonkwang University