1. Faculty of Dentistry, University of Costa Rica
2. College of Dental Medicine, University of New England
3. National Nanotechnology Laboratory
4. Laboratory of Biomaterials and Oral Pathology, School of Dentistry, Department of Biomedical and Neuromotor Sciences, University of Bologna
5. Endodontic Clinical Section, School of Dentistry, Department of Biomedical and Neuromotor Sciences, University of Bologna