title: [Alveolar bone thickness and root length changes in the treatment of skeletal Class III patients facilitated by improved corticotomy: a cone-beam CT analysis].
abstract: OBJECTIVE
  To evaluate the alveolar bone thickness and root length changes of anterior teeth with cone-beam computed tomography (CBCT).
  
  
  METHODS
  CBCT scans were taken for 12 skeletal Class III patients who accepted the improved corticotomy (IC) procedures during pre-surgical orthodontics. The CBCT data in T1 (the maxillary dental arch was aligned and leveled) and T2 (extraction space closure) were superimposed and the alveolar bone thickness at root apex level and root length measurements were done.
  
  
  RESULTS
  From T1 to T2, the buccal alveolar bone thickness for the upper lateral incisors increased from (1.89±0.83) to (2.47±1.02) mm (P<0.05), and for central incisors and for canines from (2.32±0.71) to (2.68±1.48) mm and from (2.28±1.08) to (2.41±1.40) mm, respectively. According to Sharpe Grading System, the root resorption grade for 69 teeth of 72 was located in Grade 1, two teeth in Grade 2, one tooth in Grade 3.
  
  
  CONCLUSIONS
  The improved corticotomy had the potential to increase the buccal alveolar bone thickness and the root resorption in most teeth was in Grade 1 according to Sharpe grading system.
authors.affiliation: Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Jiaqi
authors.initials: J
authors.lastname: Wu
authors.affiliation: Email: drjiangw@163.com.
authors.forename: Jiuhui
authors.initials: J
authors.lastname: Jiang
authors.forename: Li
authors.initials: L
authors.lastname: Xu
authors.forename: Cheng
authors.initials: C
authors.lastname: Liang
authors.forename: Cuiying
authors.initials: C
authors.lastname: Li
authors.forename: Xiao
authors.initials: X
authors.lastname: Xu
mesh_terms: D000539:Alveolar Process / Q000033:anatomy & histology / Q000000981:diagnostic imaging* / Q000601:surgery*; D054893:Cone-Beam Computed Tomography; D003481:Cuspid; D006801:Humans; D007180:Incisor; D008313:Malocclusion, Angle Class III / Q000000981:diagnostic imaging* / Q000601:surgery*; D012391:Root Resorption / Q000473:pathology; D014092:Tooth Root; D015050:Zygoma