1. Department of Oral and Maxillofacial Pathology; School of Dentistry; Kyung Hee University; Seoul South Korea
2. School of Mechanical Engineering; Kyungpook National University; Daegu South Korea
3. Department of Prosthodontics; School of Dentistry; Kyung Hee University; Seoul South Korea
4. Department of Dental Materials; School of Dentistry; Kyung Hee University; Seoul South Korea