title: Orthodontic treatment of impacted maxillary canines: an appraisal of prognostic factors.
abstract: OBJECTIVE
  The aim of the study was to evaluate the influence of pre-treatment radiographic features (alpha-angle, d-distance and s-sector) on the duration of active orthodontic traction of impacted maxillary canines treated by a combined surgical (flap approach) and orthodontic (direct traction to the center of the ridge) treatment.
  
  
  METHODS
  A study population of 168 patients (168 canines) was evaluated. Multiple regression analysis was used.
  
  
  RESULTS
  Pre-treatment radiographic variables were associated significantly with the duration of orthodontic traction. Age, gender and site of impaction did not affect the duration of traction significantly.
  
  
  CONCLUSIONS
  Alpha-angle, d-distance and s-sector are valid indicators for the duration of orthodontic traction.
authors.affiliation: Department of Orthodonitcs, University of Florence, Italy. t.baccetti@odonto.unifi.it
authors.forename: Tiziano
authors.initials: T
authors.lastname: Baccetti
authors.forename: Aldo
authors.initials: A
authors.lastname: Crescini
authors.forename: Michele
authors.initials: M
authors.lastname: Nieri
authors.forename: Roberto
authors.initials: R
authors.lastname: Rotundo
authors.forename: Giovan Paolo
authors.initials: GP
authors.lastname: Pini Prato
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D003481:Cuspid / Q000000981:diagnostic imaging / Q000473:pathology*; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008437:Maxilla; D008875:Middle Aged; D019647:Oral Surgical Procedures / Q000379:methods; D050793:Orthodontic Extrusion / Q000379:methods*; D011379:Prognosis; D011862:Radiography, Panoramic; D012044:Regression Analysis; D014095:Tooth, Impacted / Q000000981:diagnostic imaging / Q000601:surgery / Q000628:therapy*