1. Postgraduate Student. School of Dentistry Universidad San Francisco de Quito USFQ Diego de Robles y Av. Interoceánica Quito 170901 Ecuador
2. Department of Restorative Dentistry and Dental Materials. School of Dentistry Universidad San Francisco de Quito USFQ Diego de Robles y Av. Interoceánica Quito Ecuador 170901 Ecuador
3. Facultad de Odontología Universidad de los Andes Monseñor Álvaro del Portillo 12455 Santiago 7550000 Chile
4. Facultad de Odontología Universidad Finis Terrae Av. Pedro de Valdivia 1509 Santiago 7501015 Chile
5. Department of Prosthodontics School of Dentistry, Universidad Francisco Marroquin (UFM) Guatemala City Guatemala
6. Department of Biological and Health Sciences, School of Dentistry Centro Universitario Cesumar Unicesumar Centro Brazil
7. Department of Prosthodontics. School of Dentistry Universidad San Francisco de Quito USFQ Diego de Robles y Av. Interoceánica Quito 170901 Ecuador
8. Department of Restorative Dentistry. School of Dentistry State University of Ponta Grossa Ponta Grossa Brazil