title: Predictors of surgical-orthodontic treatment duration of unilateral impacted maxillary central incisors.
abstract: OBJECTIVE
  To determine independent predictors of duration of surgical-orthodontic treatment of impacted maxillary central incisors.
  
  
  METHODS
  The Department of Dentistry at Show Chwan Hospital, Changhua, Taiwan. Eighty patients with unilateral osseous impacted maxillary central incisors receiving a surgical-orthodontic treatment.
  
  
  METHODS
  This is a retrospective observational study. Treatment duration and its predictors were abstracted from the patients' charts and pre-treatment cephalometric radiographs. Predictors included demographics, crown angle, crown height, crown depth, and root dilacerations.
  
  
  RESULTS
  The mean age of the cohort was 9.2±2.3 years (6.4-20.6 years), and 60% were women. The mean orthodontic traction time was 8.0±4.5 months (2.0-24.1 months). Using multiple linear regression analysis, the independent predictors of treatment duration for an impacted maxillary central incisor were age (β=0.9, p<0.001), crown height (β=-0.2, p<0.05), and root dilacerations (β=3.8, p<0.001).
  
  
  CONCLUSIONS
  Duration of surgical-orthodontic treatment of an impacted maxillary central incisor varied widely. Predictors of longer treatment time were older age, high impacted tooth, and dilacerated incisors.
authors.affiliation: Department of Dentistry, Show Chwan Hospital, Changhua, Taiwan.
authors.forename: K H
authors.initials: KH
authors.lastname: Ho
authors.forename: Y F
authors.initials: YF
authors.lastname: Liao
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002508:Cephalometry; D002648:Child; D015331:Cohort Studies; D005260:Female; D005500:Follow-Up Studies; D005544:Forecasting; D006801:Humans; D007180:Incisor / Q000473:pathology* / Q000601:surgery; D008297:Male; D008437:Maxilla / Q000473:pathology* / Q000601:surgery; D050793:Orthodontic Extrusion / Q000379:methods*; D012189:Retrospective Studies; D013997:Time Factors; D019228:Tooth Crown / Q000473:pathology; D014092:Tooth Root / Q000002:abnormalities / Q000473:pathology; D014095:Tooth, Impacted / Q000601:surgery / Q000628:therapy*; D055815:Young Adult