title: Differences of treatment outcomes between self-ligating brackets with microimplant and headgear anchorages in adults with bimaxillary protrusion.
abstract: BACKGROUND
  Our aim was to determine differences between the outcomes of treatment using microimplant anchorage compared with headgear anchorage in adult patients with bimaxillary protrusion treated with self-ligating brackets.
  
  
  METHODS
  Thirty-one adult orthodontic patients (13 men, 18 women; age, 25.87 ± 3.37 years) who were diagnosed with bimaxillary protrusion were selected. All patients were treated with self-ligating brackets and maximum anchorage after extraction of 4 first premolars. Group 1 received microimplant anchorage, and group 2 received headgear. Lateral cephalometric radiographs were obtained before and after treatment. Differences in the skeletal and dental parameters between and within groups were analyzed.
  
  
  RESULTS
  No significant difference was observed in the mean treatment times between the groups (21.93 ± 3.10 vs 23.88 ± 2.68 months). There was no significant difference in skeletal measurements before or after treatment in patients who received microimplant anchorage. Patients who received headgear anchorage had an increase of the mandibular plane angle. The microimplant anchorage group had greater anterior tooth retraction and less maxillary molar mesialization than did the headgear group.
  
  
  CONCLUSIONS
  In both the anteroposterior and vertical directions, microimplant anchorage achieved better control than did the traditional headgear appliance during the treatment of bimaxillary protrusion.
authors.affiliation: Associate professor, Department of Stomatology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong, China.
authors.forename: Mu
authors.initials: M
authors.lastname: Chen
authors.affiliation: Associate professor, Department of Stomatology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong, China.
authors.forename: Zheng-Ming
authors.initials: ZM
authors.lastname: Li
authors.affiliation: Professor, Department of Stomatology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong, China. Electronic address: 17815204@qq.com.
authors.forename: Xue
authors.initials: X
authors.lastname: Liu
authors.affiliation: Associate professor, Department of Orthodontics, Guanghua School of Stomatology and Institute of Stomarological Research, Sun Yat-sen University, Guangzhou, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Cai
authors.affiliation: Professor, Department of Orthodontics, Guanghua School of Stomatology and Institute of Stomarological Research, Sun Yat-sen University, Guangzhou, China.
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Wang
authors.affiliation: Attending physician, Department of Orthodontics, Guanghua School of Stomatology and Institute of Stomarological Research, Sun Yat-sen University, Guangzhou, China.
authors.forename: Zhi-Cai
authors.initials: ZC
authors.lastname: Feng
mesh_terms: D000328:Adult; D002508:Cephalometry / Q000379:methods; D005115:Extraoral Traction Appliances; D005260:Female; D006801:Humans; D007180:Incisor / Q000473:pathology; D008297:Male; D008310:Malocclusion / Q000628:therapy*; D008334:Mandible / Q000473:pathology; D008437:Maxilla / Q000473:pathology; D008963:Molar / Q000473:pathology; D009295:Nasal Bone / Q000473:pathology; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation*; D016382:Orthodontic Appliance Design; D016910:Orthodontic Brackets; D012658:Sella Turcica / Q000473:pathology; D013997:Time Factors; D014087:Tooth Movement Techniques / Q000295:instrumentation; D016896:Treatment Outcome