1. School of Dentistry of Piracicaba State University of Campinas Piracicaba Brazil
2. Mineral Research Processing Meyzieu France
3. Aston Institute of Materials Research Aston University, Birmingham UK
4. Department of Chemistry, “Giacomo Ciamician” University of Bologna Bologna Italy
5. Department of Oral Science Sir John Walsh Research Institute, University of Otago Dunedin New Zealand
6. School of Dentistry, College of Medical and Dental Sciences University of Birmingham Birmingham UK