title: Mandibular incisor extraction: indications and long-term evaluation.
abstract: The extraction of a lower incisor constitutes a therapeutic alternative limited to certain occlusal situations, i.e. supernumerary incisors, tooth size anomalies (peg-shaped upper laterals), ectopic eruption and anterior crossbites. The effect of the extraction of a single incisor on the out of retention alignment of lower anterior teeth was studied in 26 treated cases. Initial (T1), final (T2) and 5-8 years out of retention (T3) dental casts were measured. Mean crowding at the start of treatment (T1 = 3.86 mm) relapsed out of retention (T3 = 1.49 mm), with a net mean improvement of 2.37 mm. Little's irregularity index at the start of treatment (T1 = 6.44) relapsed out of retention (T3 = 2.53), with a net mean improvement of T1-T3 = 3.91. Alignment stability seems to be better than that achieved in cases subjected to premolar extraction.
authors.affiliation: University of Valencia, Spain.
authors.forename: J A
authors.initials: JA
authors.lastname: Canut
mesh_terms: D000293:Adolescent; D000328:Adult; D001641:Bicuspid / Q000601:surgery; D002648:Child; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor / Q000002:abnormalities / Q000601:surgery*; D008137:Longitudinal Studies; D008310:Malocclusion / Q000473:pathology / Q000628:therapy*; D008334:Mandible; D003765:Models, Dental; D009811:Odontometry; D012008:Recurrence; D012690:Serial Extraction; D014079:Tooth Eruption, Ectopic / Q000601:surgery; D014081:Tooth Extraction; D014087:Tooth Movement Techniques; D014096:Tooth, Supernumerary / Q000601:surgery