1. Prosthodontics Unit, School of Dental Sciences, Health Campus Universiti Sains Malaysia Kelantan Malaysia
2. Department of Prosthodontics, Faculty of Dentistry Thamar University Dhamar Yemen
3. College of Dental Medicine, QU Health Qatar University Doha Qatar
4. School of Materials and Mineral Resources, Engineering Campus Universiti Sains Malaysia Penang Malaysia
5. Department of Oral and Maxillofacial Prosthodontics and Oral Implantology, Institute of Health Biosciences The University of Tokushima Tokushima Japan
6. Department of Dental Material Science and Technology Hang Tuah University Surabaya Indonesia