1. Graduate Program in Dentistry Catholic University of Pelotas Pelotas Brazil
2. Department of Social and Preventive Dentistry, School of Dentistry Federal University of Pelotas Pelotas Brazil
3. Department of Public Health Graduate Program in Public Health Federal University of Santa Catarina Florianópolis Brazil
4. Graduate Program in Dentistry, Prosthodontics Division, School of Dentistry Federal University of Pelotas Pelotas Brazil