title: [Clinical application of miniscrew implant for maximum anchorage cases].
abstract: OBJECTIVE
  The purpose of this study was to evaluate the efficiency of the self-drilling miniscrew implant for maximum anchorage cases.
  
  
  METHODS
  The study comprised 5 patients whose ages ranged from 14 to 31 years. All patients presented with. Class II skeletal pattern, maxillary protrusion or bimaxillary protrusion. Maximum molar anchorage and first premolar extraction were required. In the stage of anterior teeth retraction, self-drilling miniscrew implants were inserted into the buccal alveolar bone between maxillary second premolar and first molar. Sliding mechanics with 150 - 200 g force was used to retract anterior teeth. The cephalometric films before and after retraction were measured.
  
  
  RESULTS
  Dental protrusion and facial profile were improved significantly in all patients. The edge of upper incisors was retracted 6.4 mm and anchor molar moved anteriorly 0.3 mm averagely. All miniscrew implants remained stable during treatment and peri-implant soft tissue remained healthy.
  
  
  CONCLUSIONS
  Self-drilling minisrcew implant could be used as an efficient method for anchorage control and an alternative choice of extra-oral forces.
authors.affiliation: Department of Orthodontics, Peking University School of Stomatology, Beijing 100081, China.
authors.forename: Chun-Lei
authors.initials: CL
authors.lastname: Xun
authors.forename: Xiang-Long
authors.initials: XL
authors.lastname: Zeng
authors.forename: Xing
authors.initials: X
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D001863:Bone Screws; D015921:Dental Implants; D005260:Female; D006801:Humans; D008297:Male; D008311:Malocclusion, Angle Class I / Q000628:therapy*; D008312:Malocclusion, Angle Class II / Q000628:therapy*; D008963:Molar; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation* / Q000379:methods; D014025:Titanium; D055815:Young Adult
chemical_list: D015921:Dental Implants; D014025:Titanium