1. University Hospital; Federal University of Santa Maria, Roraima Avenue; 1000, Building 20; CEP: 97105-900 Santa Maria RS Brazil
2. Graduate Program in Dental Science; Federal University of Santa Maria
3. Department of Pathology; School of Dentistry; Federal University of Santa Maria, Roraima Avenue; 1000, Building 20; CEP: 97105-900 Santa Maria RS Brazil