title: Periodontal status of impacted maxillary incisors uncovered by 2 different surgical techniques.
abstract: OBJECTIVE
  The aim of this retrospective study was to compare the postretention clinical appearance and the pulpal and periodontal status of surgically exposed and orthodontically aligned impacted maxillary central incisors, treated by 2 different surgical techniques-open eruption (OE) versus closed eruption (CE).
  
  
  METHODS
  The OE group consisted of 11 patients, age 15 to 38 years. The 11 patients in the CE sample (aged 14-28 years) were selected from a larger group of patients treated by this method, by carefully matching them to the patients in the OE group, in terms of cause and height of impaction. The length of the follow-up period was comparable for both groups (median of 9 years for the CE group and 10 years for the OE group). The clinical and radiographic variables were compared by paired t and chi(2) tests.
  
  
  RESULTS
  The only parameters where statistically significant differences between the 2 study groups were found were crown length and bone support; that is, the central incisors uncovered by the OE technique had longer clinical crowns (by a mean of 1.37 mm) and decreased bone support (7.5% less on the mesial side) compared with those treated with the CE technique. Pulp changes with crown discoloration were only seen in the trauma-related group, independent of surgical technique.
  
  
  CONCLUSIONS
  The choice of surgical technique in the exposure of impacted central incisors has important implications in the success of the orthodontic treatment of impacted incisors, in the long term, in relation to periodontal support and to appearance.
authors.affiliation: Department of Orthodontics, Hebrew University, Hadassah School of Dental Medicine, Jerusalem, Israel. drchaushu@gmail.com
authors.forename: Stella
authors.initials: S
authors.lastname: Chaushu
authors.forename: Nimrod
authors.initials: N
authors.lastname: Dykstein
authors.forename: Yocheved
authors.initials: Y
authors.lastname: Ben-Bassat
authors.forename: Adrian
authors.initials: A
authors.lastname: Becker
mesh_terms: D000293:Adolescent; D000328:Adult; D000539:Alveolar Process / Q000000981:diagnostic imaging / Q000601:surgery; D016009:Chi-Square Distribution; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D008297:Male; D008437:Maxilla; D009811:Odontometry; D009971:Orthodontics, Corrective / Q000379:methods*; D010512:Periodontal Index; D011859:Radiography; D018709:Statistics, Nonparametric; D014087:Tooth Movement Techniques / Q000379:methods*; D014095:Tooth, Impacted / Q000000981:diagnostic imaging / Q000473:pathology / Q000601:surgery*; D016896:Treatment Outcome; D055815:Young Adult