{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,27]],"date-time":"2026-02-27T05:21:03Z","timestamp":1772169663497,"version":"3.50.1"},"reference-count":40,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2020,9,1]],"date-time":"2020-09-01T00:00:00Z","timestamp":1598918400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Orthod Craniofacial Res"],"published-print":{"date-parts":[[2021,2]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>To investigate occlusal result and post\u2010treatment changes after orthodontic extraction of maxillary first permanent molars in patients with a Class II division 1 malocclusion.<\/jats:p><\/jats:sec><jats:sec><jats:title>Setting and Sample<\/jats:title><jats:p>Retrospective longitudinal study in a private practice, with outcome evaluation by an independent academic hospital. Ninety\u2010six patients (53 males, 43 females) consecutively treated by one orthodontist with maxillary first permanent molar extraction were studied, divided into three facial types, based on pre\u2010treatment cephalometric values: hypodivergent (n\u00a0=\u00a018), normodivergent (n\u00a0=\u00a021) and hyperdivergent (n\u00a0=\u00a057).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Occlusal outcome was scored on dental casts at T1 (pre\u2010treatment), T2 (post\u2010treatment) and T3 (mean follow\u2010up 2.5\u00a0\u00b1\u00a00.9\u00a0years) using the weighted Peer Assessment Rating (PAR) Index. The paired sample <jats:italic>t<\/jats:italic> test and one\u2010way ANOVA followed by Tukey's post hoc test were used for statistical analysis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>PAR was reduced by 95.7% and 89.9% at T2 and T3, respectively, compared with the start of treatment. The largest post\u2010treatment changes were found for overjet and buccal occlusion. Linear regression analysis did not reveal a clear effect (R\u2010Square 0.074) of age, sex, PAR score at T1, incremental PAR score T2\u2010T1, overjet and overbite at T1, and facial type on the changes after treatment (incremental PAR score T3\u2010T2).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The occlusal outcome achieved after Class II division 1 treatment with maxillary first permanent molar extractions was maintained to a large extent over a mean post\u2010treatment follow\u2010up of 2.5\u00a0years. Limited changes after treatment were found, for which no risk factors could be discerned.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ocr.12412","type":"journal-article","created":{"date-parts":[[2020,7,29]],"date-time":"2020-07-29T18:31:35Z","timestamp":1596047495000},"page":"102-110","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Class II Division 1 malocclusion treatment with extraction of maxillary first molars: Evaluation of treatment and post\u2010treatment changes by the PAR Index"],"prefix":"10.1111","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0589-1346","authenticated-orcid":false,"given":"Johan W.","family":"Booij","sequence":"first","affiliation":[{"name":"Private practice Gorinchem The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8172-0090","authenticated-orcid":false,"given":"Anne Marie","family":"Kuijpers\u2010Jagtman","sequence":"additional","affiliation":[{"name":"Department of Orthodontics University Medical Center Groningen Groningen The Netherlands"},{"name":"Department of Orthodontics and Dentofacial Orthopedics School of Dental Medicine\/Medical Faculty University of Bern Bern Switzerland"},{"name":"Faculty of Dentistry Universitas Indonesia Jakarta Indonesia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0953-8053","authenticated-orcid":false,"given":"Ewald M.","family":"Bronkhorst","sequence":"additional","affiliation":[{"name":"Department of Dentistry Radboud Institute for Health Sciences Radboud University Medical Center Nijmegen The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9877-5645","authenticated-orcid":false,"given":"Christos","family":"Livas","sequence":"additional","affiliation":[{"name":"Dental Clinics Zwolle Zwolle The Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yijin","family":"Ren","sequence":"additional","affiliation":[{"name":"Department of Orthodontics University Medical Center Groningen Groningen The Netherlands"},{"name":"Department of Orthodontics and W.J. 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