1. Department of Restorative Dentistry; Araraquara Dental School; UNESP-Univ Estadual Paulista; Araraquara; SP; Brazil
2. Department of Pathology; Ribeirão Preto School of Medicine; USP-University of São Paulo; Ribeirão Preto; SP; Brazil
3. Department of Endodontics; Redentor School; Itaperuna; RJ; Brazil
4. Department of Endodontics; Rio Grande do Sul Federal University; Porto Alegre; RS; Brazil