title: Improvement in Peer Assessment Rating scores after nonextraction, premolar extraction, and mandibular incisor extraction treatments in patients with Class I malocclusion.
abstract: BACKGROUND
  Different treatment protocols implemented for correction of Class I malocclusion aim at achieving ideal occlusal characteristics. This study was planned to evaluate the improvement in the occlusal characteristics of Class I patients treated with nonextraction (NE), all first premolar extractions (PME), and mandibular incisor extraction (MIE) as assessed by the percentage of improvement in Peer Assessment Rating (PAR) scores.
  
  
  METHODS
  This retrospective cross-sectional study was conducted on the pretreatment and posttreatment dental casts of 108 subjects with Class I malocclusion. The total sample was divided into 3 equal groups according to the treatment protocol implemented: NE, PME, and MIE. The mean pretreatment and posttreatment PAR scores, and the percentages of improvement were compared among the 3 treatment modalities using Kruskal-Wallis and post-hoc Dunnett T3 tests.
  
  
  RESULTS
  The mean percentages of improvement in the PAR score were 75.8% ± 25.8% in the NE group, 73.1% ± 19.4% in the PME group, and 70.6% ± 24.1% in the MIE group. There was no significant difference (P = 0.351) in the percentages of improvement in PAR scores among the 3 treatment modalities. However, the mean pretreatment and posttreatment PAR scores varied significantly (P <0.001) in the 3 groups. The average pretreatment and posttreatment PAR scores were highest in the MIE group and lowest in the NE group.
  
  
  CONCLUSIONS
  The comparable percentages of improvement in PAR scores among the 3 groups denote that equivalent occlusal corrections were achieved in Class I patients treated with the NE, PME, and MIE protocols.
authors.affiliation: Orthodontics Residency Program, Section of Dentistry, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan.
authors.forename: Adeel Tahir
authors.initials: AT
authors.lastname: Kamal
authors.affiliation: Orthodontics Residency Program, Section of Dentistry, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan. Electronic address: attiya.shaikh@aku.edu.
authors.forename: Attiya
authors.initials: A
authors.lastname: Shaikh
authors.affiliation: Orthodontics Residency Program, Section of Dentistry, Department of Surgery, Aga Khan University Hospital, Karachi, Pakistan.
authors.forename: Mubassar
authors.initials: M
authors.lastname: Fida
mesh_terms: D000293:Adolescent; D000328:Adult; D001641:Bicuspid / Q000601:surgery*; D003430:Cross-Sectional Studies; D006801:Humans; D007180:Incisor / Q000601:surgery*; D008311:Malocclusion, Angle Class I / Q000175:diagnosis / Q000601:surgery* / Q000628:therapy; D008334:Mandible; D010380:Peer Review / Q000379:methods / Q000592:standards; D012189:Retrospective Studies; D014081:Tooth Extraction; D016896:Treatment Outcome; D055815:Young Adult