1. Department of Oral and Maxillofacial Medicine, School of Dentistry Alborz University of Medical Sciences Karaj Iran
2. Section of Prosthodontics, Weintraub Center for Reconstructive Biotechnology, School of Dentistry University of California Los Angeles California USA
3. Department of Restorative Dentistry, School of Dentistry Universidade Federal de Minas Gerais Belo Horizonte Brazil
4. Advanced Graduate Prosthodontics Resident University of California, School of Dentistry Los Angeles California USA
5. Section of Prosthodontics, School of Dentistry University of California Los Angeles California USA