1. Department of Restorative Dentistry, Dental School of Ribeirão Preto, University of São Paulo, Ribeirão Preto-SP, Brazil, 14040-904
2. Department of Physics and Chemistry, Faculty of Pharmaceutical Sciences of Ribeirao Preto, University of Sao Paulo, Ribeirão Preto-SP, Brazil, 14040-904
3. Department of Social Medicine, Medical School of Ribeirão Preto, University of São Paulo, Ribeirão Preto-SP, Brazil, 14049- 900