1 Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, University of São Paulo, 14040-904, Brazil.
2 Vitreous Materials Laboratory, Department of Materials Engineering, Federal University of São Carlos, 13565-905, Brazil.
3 Department of Dental Materials and Prosthodontics, School of Dentistry of Ribeirão Preto, University of São Paulo, 14040-904, Brazil. Electronic address: catirapelli@forp.usp.br.