[1] Univ Fed Rio Grande do Norte, Dept Odontol, BR-59056000 Natal, RN, Brazil
[2] Univ Fed Rio Grande do Sul, Dept Mat, Porto Alegre, RS, Brazil
[3] Univ Fed Rio Grande do Norte, Lab Proc Mat Plasma, BR-59056000 Natal, RN, Brazil
[4] Univ Fed Rio Grande do Norte, Dept Morfol, BR-59056000 Natal, RN, Brazil
[5] Univ Sao Paulo, Fac Med, Inst Ortopedia & Traumatol, Sao Paulo, Brazil