[1] Pontificia Univ Catolica Rio Grande do Sul, Sch Dent, Postgrad Program Dent Coll, BR-90619900 Porto Alegre, RS, Brazil
[2] Pontificia Univ Catolica Rio Grande do Sul, Hosp Sao Lucas, Stomatol Serv, BR-90619900 Porto Alegre, RS, Brazil
[3] Pontificia Univ Catolica Rio Grande do Sul, Inst Toxicol, BR-90619900 Porto Alegre, RS, Brazil