1. Department of Endodontics, São Leopoldo Mandic College, São Leopoldo Mandic Research Institute, Campinas, São Paulo, Brazil
2. Department of Endodontics and Dental Research, Iguaçu University, Nova Iguaçu, Brazil
3. Department of Dental Prosthesis, Belem General Hospital, Belém, Pará, Brazil
4. President Antonio Carlos University, Porto Nacional, ITPAC, Porto/ FAPAC, Palmas, Brazil
5. Departament of Nuclear Energy, Rio de Janeiro Federal University, Rio de Janeiro, Brazil