title: Maxillary anterior alignment stability in Class I and Class II malocclusions treated with or without extraction.
abstract: OBJECTIVE
  To compare the postretention stability of maxillary incisors alignment in subjects with Class I and II malocclusion treated with or without extractions.
  
  
  METHODS
  The sample comprised 103 subjects with initial maxillary anterior irregularity greater than 3 mm and was divided into four groups: group 1 comprised 19 patients with Class I malocclusion treated with nonextraction (mean initial age = 13.06 years); group 2 comprised 19 patients with Class II malocclusion treated with nonextraction (mean initial age = 12.54 years); group 3 comprised 30 patients with Class I malocclusion treated with extractions (mean initial age = 13.16 years); group 4 comprised 35 patients with Class II malocclusion treated with extractions (mean initial age = 12.99 years). Dental casts were obtained at three different stages: pretreatment (T1), posttreatment (T2), and long-term posttreatment (T3). Maxillary incisor irregularity and arch dimensions were evaluated. Intergroup comparisons were performed by one-way analysis of variance followed by Tukey tests.
  
  
  RESULTS
  In the long-term posttreatment period, relapse of maxillary crowding and arch dimensions was similar in all groups.
  
  
  CONCLUSIONS
  Changes in maxillary anterior alignment in Class I and Class II malocclusions treated with nonextractions and with extractions were similar in the long-term posttreatment period.
authors.affiliation: a  Orthodontic graduate student, Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.
authors.forename: Willian Juarez Granucci
authors.initials: WJ
authors.lastname: Guirro
authors.affiliation: b  Associate Professor, Department of Orthodontics, Ingá Dental School, Maringá, Brazil.
authors.forename: Karina Maria Salvatore
authors.initials: KM
authors.lastname: Freitas
authors.affiliation: c  Professor, Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.
authors.forename: Guilherme
authors.initials: G
authors.lastname: Janson
authors.affiliation: c  Professor, Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.
authors.forename: Marcos Roberto
authors.initials: MR
authors.lastname: de Freitas
authors.affiliation: a  Orthodontic graduate student, Department of Orthodontics, Bauru Dental School, University of São Paulo, São Paulo, Brazil.
authors.forename: Camila Leite
authors.initials: CL
authors.lastname: Quaglio
mesh_terms: D000293:Adolescent; D002648:Child; D006801:Humans; D008311:Malocclusion, Angle Class I / Q000628:therapy*; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008437:Maxilla; D014081:Tooth Extraction
keywords: Maxillary crowding; Relapse; Stability
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