title: [Clinical trial on intrusion of overerupted maxillary molars with microscrew].
abstract: OBJECTIVE
  To investigate the imtrusion of overerupted molars with microscrews as anchorage.
  
  
  METHODS
  Thirteen adult patients were treated with microscrew anchorage and fixed appliances. Twenty-three overerupted posterior maxillary teeth were intruded. The intrusive movement was investigated on cephalometric radiographs.
  
  
  RESULTS
  The molars were intruded and the occlusal plane was corrected successfully in all patients. The treatment period of intrusion was from 5 to 18 months (mean 10.4 months). Significant true intrusion of overerupted maxillary molars, ranged from 0.45 mm to 7.00 mm [mean (2.86 +/- 1.80) mm], was achieved (P < 0.001). The apical root resorption was not clinically significant and the bone level was unchanged.
  
  
  CONCLUSIONS
  The microscrew anchorage and fixed appliances were applicable and efficacious for intrusion of overerupted maxillary molars.
authors.affiliation: Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Xue-fang
authors.initials: XF
authors.lastname: Ding
authors.forename: Yan-heng
authors.initials: YH
authors.lastname: Zhou
authors.forename: Xue-mei
authors.initials: XM
authors.lastname: Gao
mesh_terms: D000328:Adult; D001863:Bone Screws; D002508:Cephalometry; D003757:Dental Implantation; D005260:Female; D006801:Humans; D008297:Male; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D008963:Molar / Q000002:abnormalities* / Q000601:surgery; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation* / Q000379:methods; D014087:Tooth Movement Techniques / Q000295:instrumentation* / Q000379:methods; D016896:Treatment Outcome; D055815:Young Adult