title: [Orthodontic anchorage].
abstract: BACKGROUND
  Orthodontic treatments apply forces on teeth to move them. Since there is no fixed anatomic anchorage, every orthodontic action will cause a counter-action of equal force. This is usually unwanted and strong bone anchorage is used to prevent this counter-action. These anchorages provide the fixed point required for orthodontic effectiveness.
  
  
  METHODS
  We describe some devices, their implantation site, placement, and removal. Our experience is essentially based on the Lomas® and Orthocorrect® devices manufactured by Mondeal® (Germany) and on screwed anchorage devices manufactured by Stryker® (USA).
  
  
  CONCLUSIONS
  These screwed anchorage systems allow for previously impossible treatments, especially for orthodontics applied to adults and for preprosthetic orthodontics. But these screws can induce apical migration of teeth; so it may be necessary to provide several anchorage sites. Complications are rare and usually present as root perforation.
authors: Service de chirurgie maxillofaciale et stomatologie infantiles, hôpital Debrousse, 29 rue Soeur-Bouvier, Lyon, France. docteurpaulus@paulus-richard.com
authors: C
authors: C
authors: Paulus
authors: C
authors: C
authors: Hartmann
mesh_terms: D000328:Adult; D001863:Bone Screws; D003758:Dental Implantation, Endosseous / Q000295:instrumentation / Q000379:methods; D020878:Device Removal / Q000379:methods; D006801:Humans; D008954:Models, Biological; D052280:Orthodontic Anchorage Procedures / Q000295:instrumentation* / Q000379:methods*; D016382:Orthodontic Appliance Design; D053441:Suture Anchors