1. Department of Dental Materials and Prothesis; School of Dentistry of Ribeirao Preto University of Sao Paulo (USP) Ribeirão Preto SP Brazil
2. Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto University of São Paulo Ribeirão Preto São Paulo Brazil
3. Bonyf AG Vaduz Liechtenstein