1. School of Dentistry; Universidade Luterana do Brasil; Canoas RS Brazil
2. Department of Endodontics; School of Dentistry; Tehran University of Medical Sciences; Tehran Iran
3. Endodontology Research Group; School of Dentistry; Cardiff University; Cardiff UK
4. School of Chemistry; Cardiff University; Cardiff UK
5. Materials and Nanosciences Laboratory; School of Physics; Pontifícia Universidade Católica do Rio Grande do Sul; Porto Alegre RS Brazil