1. Graduate and Post Graduate Program in Dentistry; Ceuma University-UniCEUMA; São Luís Maranhão Brazil
2. Department of Prosthodontics and Periodontology; Piracicaba Dental School; University of Campinas-UNICAMP; Piracicaba Sao Paulo Brazil
3. Department of Prosthodontics; The Pontifical Catholic University of Minas Gerais-PUCMG; Belo Horizonte Minas Gerais Brazil