title: Correlation between the Rotation of the First Molars and the Severity of Class II Division 1 Malocclusion.
abstract: This study aimed to evaluate the potential correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation of the maxillary first molars. Scanned images of 104 cast models were grouped according to the severity of Class II malocclusion as follows: Group 1, 1/4 Class II malocclusion; Group 2, 1/2 Class II malocclusion; Group 3, 3/4 Class II malocclusion; and Group 4, complete Class II malocclusion. The rotation was measured using parameters described by Henry, Friel, and Ricketts, referred to as indicators 1, 2, and 3, respectively. The correlation was evaluated using the Spearman's correlation coefficient. The rotational indicators were compared using one-way analysis of variance. For all statistical analyses used p < 0.05, a positive correlation was observed between the severity of Class II malocclusion and the mesiopalatal rotation of the maxillary first molar. This correlation was statistically significant for indicator 1 between Groups 1 and 3 and for indicator 2 between Groups 1 and 4, which include cases of extreme malocclusion. In conclusion, there is a positive correlation between the severity of Class II division 1 malocclusion and the magnitude of mesiopalatal rotation in the maxillary first molars.
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Betânia Pessoa
authors.initials: BP
authors.lastname: Lima
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Célia Regina Maio
authors.initials: CR
authors.lastname: Pinzan-Vercelino
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Laércio Santos
authors.initials: LS
authors.lastname: Dias
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Fausto Silva
authors.initials: FS
authors.lastname: Bramante
authors.affiliation: Ceuma University, Rua Josué Montello No. 1, Renascença II, 65075-120 São Luís, MA, Brazil.
authors.forename: Rudys Rodolfo De Jesus
authors.initials: RR
authors.lastname: Tavarez
mesh_terms: D006801:Humans; D008312:Malocclusion, Angle Class II / Q000175:diagnosis*; D008963:Molar; D012399:Rotation; D012720:Severity of Illness Index