title: Stability of molar relationship after non-extraction Class II malocclusion treatment.
abstract: OBJECTIVE
  This study aimed to evaluate the stability of molar relationship after non-extraction treatment of Class II malocclusion.
  
  
  METHODS
  The sample comprised 39 subjects (16 females, 23 males) with initial Class II malocclusion treated with no extractions, using fixed appliances. Mean age at the beginning of treatment was 12.94 years, at the end of treatment was 15.14 years and at post-retention stage was 21.18 years. Mean treatment time was 2.19 years and mean time of post-treatment evaluation was 6.12 years. To verify the influence of the severity of initial Class II molar relationship in stability of molar relationship, the sample was divided into two groups, one presenting a ½-cusp or ¾-cusp Class II molar relationship, and the other with full-cusp Class II molar relationship. In dental casts from initial, final and post-retention stages, molar, first and second premolars and canine relationships were measured. Data obtained were analyzed by dependent ANOVA, Tukey and Pearson's correlation tests, as well as independent t test between the two groups divided by severity of initial molar relationship.
  
  
  RESULTS
  There was a non-statistically significant 0.12-mm relapse of molar relationship. The initial severity of Class II molar relationship was not correlated to relapse in the post-retention period. When compared, the two groups showed no difference in relapse of molar relationship.
  
  
  CONCLUSIONS
  It was concluded that correction of Class II molar relationship is stable and initial severity does not influence relapse of molar relationship.
authors.affiliation: UNORP, Brazil.
authors.forename: Darwin Vaz
authors.initials: DV
authors.lastname: de Lima
authors.forename: Karina Maria Salvatore
authors.initials: KM
authors.lastname: de Freitas
authors.forename: Marcos Roberto
authors.initials: MR
authors.lastname: de Freitas
authors.forename: Guilherme
authors.initials: G
authors.lastname: Janson
authors.forename: José Fernando Castanha
authors.initials: JF
authors.lastname: Henriques
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Pinzan
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D005260:Female; D006801:Humans; D007568:Jaw / Q000033:anatomy & histology; D008137:Longitudinal Studies; D008297:Male; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008963:Molar / Q000033:anatomy & histology*; D009971:Orthodontics, Corrective / Q000295:instrumentation; D012189:Retrospective Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome; D055815:Young Adult
keywords: Angle Class II malocclusion; Corrective orthodontics; Treatment outcomes