title: The role of extraction in stability of orthodontic treatment.
abstract: Long-term postretention assessment of orthodontically treated cases has been of interest for 5 decades; however, extraction versus nonextraction follow-up studies are difficult to compare without regard to sample structure, therapy concept und different parameters. The results of selected studies- extraction of 1 or 2 incisors, of premolars and of second and third molars, early and late extraction therapy and serial extraction-showed that long-term postretention stability is not a realistic treatment goal. The Cologne long-term records allow optimistic prediction: relative stability has been found in the majority of former patients, irrespective of the kind of treatment and treatment time. Original anomaly, type (extraction/nonextraction) and amount of treatment, and end-of-treatment alignment were found to be major factors influencing dentoalveolar and skeletal post-treatment changes. The conclusion is that therapy-induced post-treatment changes can be reduced by having a treatment goal within the anatomic limits.
authors.affiliation: Department of Orthodontics, University of Cologne, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Kahl-Nieke
mesh_terms: D001641:Bicuspid / Q000601:surgery; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000601:surgery; D008310:Malocclusion / Q000628:therapy; D008963:Molar / Q000601:surgery; D009971:Orthodontics, Corrective; D012690:Serial Extraction