作者单位:Aeronautical Institute of Technology (ITA), S?o José dos Campos, Brazil[1]Restorative Dentistry (Prosthodontics), Federal University of Santa Maria, R Floriano Peixoto 1184[2]Dental Materials and Prosthodontics, S?o Paulo State University (UNESP), S?o José dos Campos, Brazil[3]Biomaterials and Oral Biology, University of S?o Paulo (USP), S?o Paulo, Brazil[4]