[1] Fed Univ Rio Grande do Sul UFRGS, Porto Alegre, RS, Brazil
[2] Fed Univ Rio Grande do Sul UFRGS, Sch Dent, Postgrad Program Pediat Dent, Porto Alegre, RS, Brazil
[3] Fed Univ Rio Grande do Sul UFRGS, Fac Med, Postgrad Program Epidemiol, Porto Alegre, RS, Brazil
[4] Fed Univ Rio Grande do Sul UFRGS, Fac Dent, Postgrad Program Endodont, Porto Alegre, RS, Brazil
[5] Inedi Coll CESUCA, Sch Dent, Cachoeirinha, RS, Brazil