1. Department of Conservative Dentistry, Federal University of Rio Grande do Sul, School of Dentistry, Porto Alegre, Rio Grande do Sul, Brazil.
2. Department of Preventive and Community Dentistry, University of Iowa, College of Dentistry, Iowa City, Iowa, USA.
3. Department of Science and Technology, State University of Santa Cruz, School of Computer Science, Ilheus, Bahia, Brazil.
4. Department of Dental Materials and Prosthodontics, State University Julio de Mesquita Filho, School of Dentistry, Sao Jose dos Campos, Sao Paulo, Brazil.
5. Department of Prosthodontics and Periodontology, State University of Campinas, Piracicaba Dental School, Piracicaba, Sao Paulo, Brazil.