1. Department of Endodontics, School of Dentistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.
2. Department of Endodontics, School of Dentistry, Rio de Janeiro State University (UERJ), Rio de Janeiro, RJ, Brazil.
3. Department of Endodontics, School of Dentistry, Grande Rio University (UNIGRANRIO), Rio de Janeiro, RJ, Brazil.
4. Department of Preventive and Social Dentistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, RS, Brazil.