title: Radiographic comparison of apical root resorption after orthodontic treatment between bidimensional and Roth straight-wire techniques.
abstract: OBJECTIVE
  The aim of this study was to compare the amount of root resorption after orthodontic treatment between the bidimensional and the Roth straight-wire techniques. Another objective was to compare the amount of root resorption in the whole sample studied and record the prevalence of root resorption.
  
  
  METHODS
  The sample consisted of 40 patients (age ranged between 11 and 18 years) with Angle Class II division 1 malocclusions, treated nonextraction. Twenty patients were treated with bidimensional technique and 20 with a 0.018-inch Roth straight-wire technique. Root lengths of the maxillary incisors were measured on pre- and post-treatment periapical radiographs.
  
  
  RESULTS
  The results demonstrated that the bidimensional and Roth straight-wire groups showed significant root resorption after treatment, 1.11 (0.17) and 0.86 (0.05), respectively, P < 0.001. When comparing the amount of root shortening between the bidimensional and Roth straight-wire groups, there was no significant difference between the mean change from pre- to post-treatment between bidimensional group (mean = 1.00 ± 1.34) and Roth straight-wire group (mean = 0.88 ± 0.86), P = 0.63. Considering the whole sample, there was no root resoprtion in 32.5% of the analysed teeth. There was only mild resorption in 56.2%, moderate in 8.8% and severe in only 2.5% of the teeth.
  
  
  CONCLUSIONS
  Treatment with the bidimensional technique did not produce an increase in the amount of root resorption. The prevalence and amount of root resorption was similar between bidimensional and Roth straight-wire techniques.
authors.affiliation: Department of Orthodontics, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.
authors.forename: Khalid H
authors.initials: KH
authors.lastname: Zawawi
authors.affiliation: North Jeddah Specialty Dental Centre, Ministry of Health, Jeddah, Saudi Arabia.
authors.forename: Ghadah A
authors.initials: GA
authors.lastname: Malki
keywords: Bidimensional; Roth; orthodontic; root resorption; slot-size; straight-wire