title: Relationship between the maxillary transverse dimension and palatally displaced canines: A cone-beam computed tomographic study.
abstract: OBJECTIVE
  To examine the relationship between palatally displaced maxillary canines (PDC) and the maxillary transverse dimension using cone-beam computed tomography (CBCT).
  
  
  METHODS
  Thirty-three patients (11 males and 22 females, mean age 18.2 years) with PDC were matched to 66 patients (22 males and 44 females, mean age 18.1 years) without PDC (control) by gender, age, and posterior occlusion. A CBCT image was taken on all the patients prior to any orthodontic treatment. For each patient the maxillary basal bone widths and interdental widths at the maxillary first molars and first and second premolars were measured on axial and coronal sections of CBCT images. In addition, the presence of permanent tooth agenesis and the widths of maxillary incisors were recorded.
  
  
  RESULTS
  Similar maxillary transverse dimensions, both skeletally and dentally, were found between the PDC and control groups. In the PDC group, the number of patients with permanent tooth agenesis was six times higher than in the control group. In addition, the maxillary lateral incisors on PDC-affected sides were smaller than those of control group (P < .05).
  
  
  CONCLUSIONS
  The maxillary transverse dimension, both skeletally and dentally, had no effect on the occurrence of PDC. The higher prevalence of permanent tooth agenesis was found in the PDC group. Moreover, the mean mesiodistal width of maxillary lateral incisors in the PDC group was significantly smaller than in the control group (P < .05).
authors.affiliation: a  Former Orthodontic Resident, Department of Orthodontics, University of Pennsylvania School of Dental Medicine, Philadelphia, Pa.
authors.forename: Wei-Hsin
authors.initials: WH
authors.lastname: Hong
authors.forename: Rebecca
authors.initials: R
authors.lastname: Radfar
authors.forename: Chun-Hsi
authors.initials: CH
authors.lastname: Chung
mesh_terms: D000293:Adolescent; D000328:Adult; D000848:Anodontia / Q000000981:diagnostic imaging; D001641:Bicuspid / Q000000981:diagnostic imaging; D016022:Case-Control Studies; D002508:Cephalometry / Q000379:methods; D002648:Child; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D003481:Cuspid / Q000000981:diagnostic imaging*; D003724:Dental Arch / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional / Q000379:methods; D007180:Incisor / Q000000981:diagnostic imaging; D008297:Male; D008437:Maxilla / Q000000981:diagnostic imaging*; D008963:Molar / Q000000981:diagnostic imaging; D009811:Odontometry / Q000379:methods; D010159:Palate / Q000000981:diagnostic imaging*; D014095:Tooth, Impacted / Q000000981:diagnostic imaging*; D055815:Young Adult
keywords: CBCT; Palatally displaced canine; Transverse dimension
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