1. Universidade Federal de Alagoas School of Dentistry, Maceió, AL, Brazil.
2. Department of Clinical and Preventive Dentistry, Oral Pathology and Oral Radiology Sections, Universidade Federal de Pernambuco School of Dentistry, Recife, PE, Brazil.
3. Department of Histology, Universidade Federal de Pernambuco, Recife, PE, Brazil.