1. Amazonas State University Dentistry Clinics; Manaus Amazonas Brazil
2. Department of Prosthodontics and Periodontology; Piracicaba School of Dentistry, UNICAMP; Piracicaba Sao Paulo Brazil
3. Department of Restorative Dentistry, Division of Dental Materials; Piracicaba School of Dentistry, UNICAMP; Piracicaba Sao Paulo Brazil