1. Department of Endodontics Federal University of Mato Grosso do Sul Campo Grande Brazil
2. Department of Endodontics Fluminense Federal University Niterói Brazil
3. Faculty of Dentistry São Leopoldo Mandic Campinas Brazil
4. Department of Endodontics Grande Rio University Duque de Caxias Brazil
5. Nuclear Engineering Program Federal University of Rio de Janeiro Rio de Janeiro Brazil
6. Department of Dentistry II Federal University of Maranhão São Luís Brazil