[1] Univ Fed Minas Gerais, Fac Odontol, Hosp Clin Fed, Pain Clin, BR-31270901 Belo Horizonte, MG, Brazil
[2] Univ Fed Minas Gerais, Dept Surg, Sch Med, Belo Horizonte, MG, Brazil
[3] Univ Fed Minas Gerais, Sch Dent, Dept Oral Pathol & Surg, Belo Horizonte, MG, Brazil