1. Division of Endodontics College of Dentistry University Center of Várzea Grande (UNIVAG) Várzea Grande, Matogrosso Brazil
2. Department of Operative Dentistry Endodontics and Dental Materials Bauru School of Dentistry University of São Paulo Bauru São Paulo Brazil
3. Department of Operative Dentistry Rio Grande do Sul Federal University Porto Alegre Rio Grande do Sul Brazil