title: Mandibular incisor extraction: a systematic review of an uncommon extraction choice in orthodontic treatment.
abstract: OBJECTIVE
  To review the published literature in order to address clinical questions regarding the indications, effects and outcomes of mandibular incisor extraction in orthodontics.
  
  
  METHODS
  Three electronic databases were searched: PubMed (1950-January 2011), Ovid Embase+Ovid Embase Classic (1947-January 2011) and Cochrane library (6 Cochrane databases, 1996-January 2011). The following journals were additionally searched: American Journal of Orthodontics and Dentofacial Orthopedics (1960-January 2011), Angle Orthodontist (1960-January 2011), European Journal of Orthodontics (1970-January 2011) and Journal of Orthodontics (1974-January 2011). Grey literature was searched using Google Scholar and System for Information on Grey Literature in Europe. Secondary search of the references cited in the relevant articles was also conducted.
  
  
  METHODS
  Articles in vivo, in Humans, in English, concerning treatment of malocclusion with mandibular incisor extractions or missing mandibular incisors. Fifty-four publications met these inclusion criteria and were reviewed.
  
  
  METHODS
  Data were extracted independently by two reviewers with regard to: (1) indications; (2) contraindications; (3) effects; (4) outcomes; and (5) factors associated with successful outcomes.
  
  
  RESULTS
  Considering the descriptive nature of the studies found, a narrative synthesis was undertaken.
  
  
  CONCLUSIONS
  The descriptive nature of published articles precludes making strong evidence-based recommendations regarding this extraction choice, but it is clear that mandibular incisor extraction can be effectively used in the resolution of crowding, as well as intermaxillary malocclusion in carefully selected cases. Several factors that could lead to good outcomes of orthodontic treatment following mandibular incisor extraction were identified. Mild-to-moderate class III malocclusion, an edge-to-edge anterior occlusion or anterior crossbite, with mild anterior mandibular tooth size excess, and minimal open bite tendencies were the clinical situations most frequently treated with this unique extraction choice. On the other hand, clinicians should be careful to avoid poor outcomes such as gingival recession, open interproximal gingival embrasures, increased overjet and overbite.
authors.affiliation: Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Dzmitry
authors.initials: D
authors.lastname: Zhylich
authors.forename: Sunjay
authors.initials: S
authors.lastname: Suri
mesh_terms: D055094:Evidence-Based Dentistry; D006801:Humans; D007180:Incisor; D008310:Malocclusion / Q000628:therapy*; D008334:Mandible; D009971:Orthodontics, Corrective / Q000379:methods*; D010043:Outcome and Process Assessment, Health Care; D014081:Tooth Extraction