title: A comparative study of treatment outcomes between begg and edgewise orthodontic systems in class I cases.
abstract: BACKGROUND
  The purpose of this study was to compare the occlusal peer assessment rating (PAR) index in Class I patients treated by means of Begg and Edgewise methods.
  
  
  METHODS
  The pre- and post-treatment study models of Class I patients, referred to two private clinics, treated with Begg method (n = 30) and standard Edgewise method (n = 30), were reviewed retrospectively using PAR index including dental displacements, buccal occlusion (anteroposterior, vertical and transverse), overjet, overbite and midline parameters. The changes in PAR indices were analyzed using paired t-test. A P < 0.05 was considered as statistically significant.
  
  
  RESULTS
  There was no significant difference in sex and age distribution between the two groups. The improvement of buccal occlusion in patients treated by Begg method (1.51 ± 0.39) was significantly higher than that of patients treated by Edgewise method (0.28 ± 0.39). The duration of treatment in Begg method (17.8 ± 1.3 months) was significantly shorter than that of Edgewise method (23.7 ± 1.3 months). However, there were no significant differences between the two methods in terms of total PAR index, dental displacements, overjet, overbite and midline.
  
  
  CONCLUSIONS
  In conclusion, findings of the present study indicated that Begg method might be associated with better improvement of buccal occlusion and shorter duration of treatment.
authors.affiliation: Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: Abas Ali
authors.initials: AA
authors.lastname: Sahafian
authors.affiliation: Department of Orthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
authors.forename: Farzin
authors.initials: F
authors.lastname: Heravi
authors.affiliation: Department of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
authors.forename: Morteza
authors.initials: M
authors.lastname: Oshagh
authors.affiliation: Dental Section, Farzan Clinical Research Institute, Tehran, Iran.
authors.forename: Leila
authors.initials: L
authors.lastname: Adab
keywords: Begg; edgewise; peer assessment rating