title: [Extraction in orthodontics: when and why?].
abstract: During the last century orthodontic treatment philosophies changed continuously. The necessity to extract teeth in order to correct a lack of space has many times been the subject of discussion. In fact there exists several techniques which make it possible to avoid extractions in many cases. A number of criteria which influence the decision to extract or not, as well as some techniques to regain space in upper and lower arch are discussed.
mesh_terms: D008310:Malocclusion / Q000601:surgery* / Q000628:therapy; D009971:Orthodontics, Corrective / Q000379:methods; D013027:Space Maintenance, Orthodontic / Q000379:methods; D014081:Tooth Extraction
vernacular_title: L'extraction en orthodontie: quand et pourquoi?