1. Department of Dental Materials and Prosthodontics, São Paulo State University (UNESP), Institute of Science and Technology, São José Dos Campos, Brazil.
2. College of Dentistry, University of Taubaté (Unitau), Taubaté, Brazil.
3. Technological Institute of Aeronautics, Physics department, São José dos Campos, Brazil.
4. College of Dentistry, Federal University of Santa Maria (UFSM), Santa Maria, Brazil.