title: Maxillary lateral incisor morphology and palatally displaced canines: a case-controlled cone-beam volumetric tomography study.
abstract: BACKGROUND
  The goal of this study was to compare the dimensions of maxillary lateral incisors in subjects with and without palatally displaced canines.
  
  
  METHODS
  An experimental group of 40 patients with 46 palatally displaced canines (20 in boys, 26 in girls; mean age, 13.9 years; range, 10.5-15.9 years) was selected from the records of patients referred to a radiology practice specializing in cone-beam volumetric tomography imaging. The palatally displaced canine group was age- and sex-matched with 30 normal subjects with 60 canines (26 in boys, 34 in girls; mean age, 13.8 years; range, 10.4-15.7 years). Cone-beam volumetric tomography DICOM files were imported into Dolphin Imaging software (version 11.0; Dolphin Imaging & Management Solutions, Chatsworth, Calif), and the volumetric images were reoriented with the long axis of the lateral incisor vertical and then reconstructed into images of a sagittal slice through the maxillary lateral incisors and 3 axial slices across the maxillary lateral incisor root. The linear variables of the maxillary lateral incisors were measured by using digital measurement tools. The widths of the maxillary lateral incisor roots were registered at the cementoenamel junction level, 4 mm apical to the cementoenamel junction level and 8 mm apical to the cementoenamel junction level. An independent t test was used to test for differences between the groups, because the data were normally distributed.
  
  
  RESULTS
  In the group with palatally displaced canines, the mean length of the maxillary lateral incisors was 2.1 mm shorter (P <0.001), and the mean root width was smaller, especially in the buccolingual dimension, by 0.7 mm (P <0.001).
  
  
  CONCLUSIONS
  Lateral incisors adjacent to palatally displaced canines were smaller compared with those adjacent to normal canines.
authors.affiliation: Discipline of Orthodontics, School of Dentistry, University of Queensland, Brisbane, Queensland, Australia. ing.liuk@uqconnect.edu.au
authors.forename: Ing Wei
authors.initials: IW
authors.lastname: Liuk
authors.forename: Richard John
authors.initials: RJ
authors.lastname: Olive
authors.forename: Mark
authors.initials: M
authors.lastname: Griffin
authors.forename: Paul
authors.initials: P
authors.lastname: Monsour
mesh_terms: D000293:Adolescent; D016022:Case-Control Studies; D002648:Child; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003481:Cuspid / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007180:Incisor / Q000000981:diagnostic imaging*; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging; D009811:Odontometry / Q000379:methods*; D010159:Palate / Q000000981:diagnostic imaging; D012189:Retrospective Studies; D019237:Tooth Cervix / Q000000981:diagnostic imaging; D014092:Tooth Root / Q000000981:diagnostic imaging; D014095:Tooth, Impacted / Q000000981:diagnostic imaging*