1. Department of Dental Materials and Prosthodontics; Ribeirão Preto Dental School; University of São Paulo; Ribeirão Preto São Paulo Brazil
2. Department of Physics and Chemistry; Ribeirão Preto Pharmaceutical Sciences School; University of São Paulo; Ribeirão Preto São Paulo Brazil
3. Laboratory of Solid State Chemistry; State University of Campinas-UNICAMP; Campinas São Paul Brazil