1. Department of Dental Materials and Prosthodontics, Araraquara School of Dentistry; Univ. Estadual Paulista; Araraquara Brazil
2. Department of Dental Materials and Prosthodontics, Instituto de Ciência e Tecnologia-ICT; Univ Estadual Paulista-UNESP; São José dos Campos Brazil
3. Department of Restorative Dentistry (Prosthodontics), School of Dentistry; Federal University of Santa Maria; Rio Grande do Sul State Santa Maria Brazil
4. Department of Dental Materials Science at ACTA; Universiteit van Amsterdam and Vrije Universiteit; Amsterdam The Netherlands