title: The assessment of impacted maxillary canine position with panoramic radiography and cone beam CT.
abstract: OBJECTIVE
  The aim of this study was to correlate the position of impacted maxillary canines on panoramic radiography with cone beam CT (CBCT) and analyse the labiopalatal position of canines and root resorption of permanent incisors in CBCT according to the mesiodistal position of canines on panoramic radiographs.
  
  
  METHODS
  This study was a retrospective radiographic review of 63 patients with 73 impacted maxillary canines. The mesiodistal position of the canine cusp tip was classified by sector location and analysed on 73 impacted canines from 63 panoramic radiographs. The labiopalatal position of the impacted canines and root resorption of permanent incisors were evaluated with CBCT. The sector location on panoramic radiographs was compared with the labiopalatal position of impacted maxillary canines on CBCT. The statistical correlation between panoramic and CBCT findings was examined using the χ(2) test and the Fisher's exact test.
  
  
  RESULTS
  Labially impacted canines in CBCT were more frequent in Panoramic Sectors 1, 2 and 3, mid-alveolus impacted canines were more frequent in Sector 4 and palatally impacted canines were more frequent in Sector 5. There was a statistically significant association between the panoramic sectors of the impacted canines and the labiopalatal position of the canines (p < 0.001). Root resorption of permanent incisors showed a significant difference according to sector location (p < 0.001) and was observed in Sectors 3, 4 and 5.
  
  
  CONCLUSIONS
  This study suggests that the labiopalatal position of impacted canines and resorption of permanent incisors might be predicted using sector location on panoramic radiography.
authors: Department of Oral and Maxillofacial Radiology, Pusan National University, Busan, Republic of Korea.
authors: Y H
authors: YH
authors: Jung
authors: H
authors: H
authors: Liang
authors: B W
authors: BW
authors: Benson
authors: D J
authors: DJ
authors: Flint
authors: B H
authors: BH
authors: Cho
mesh_terms: D000293:Adolescent; D000328:Adult; D016009:Chi-Square Distribution; D002648:Child; D054893:Cone-Beam Computed Tomography; D003481:Cuspid / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging; D008875:Middle Aged; D011862:Radiography, Panoramic; D012189:Retrospective Studies; D014095:Tooth, Impacted / Q000000981:diagnostic imaging*