{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,14]],"date-time":"2026-07-14T11:59:10Z","timestamp":1784030350028,"version":"3.55.0"},"reference-count":38,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2024,8,13]],"date-time":"2024-08-13T00:00:00Z","timestamp":1723507200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Orthod Craniofacial Res"],"published-print":{"date-parts":[[2024,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objectives<\/jats:title><jats:p>This study aims to compare the achieved and predicted root movements in adults after four first\u2010premolar extractions and Invisalign treatment.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Thirty\u2010three consecutive adults (22 Class I, 9 Cusp\u2010to\u2010cusp Class II and 2 Cusp\u2010to\u2010cusp Class III) from a single clinical division who completed the first series of aligners after premolar extractions were included in this retrospective study. A pretreatment cone\u2010beam computed tomography model was registered onto the pretreatment surface\u2010scanned dental model (SSDM) to locate the pretreatment root apices of the whole dentition. These were copied and transferred to the predicted and achieved post\u2010treatment SSDMs to acquire the locations of the predicted and achieved post\u2010treatment root apices. The differences between predicted and achieved root movements (DPARMs) were tested using the paired t\u2010test or Wilcoxon signed rank test.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In the anteroposterior direction, posterior root movements of maxillary and mandibular anterior teeth were poorly achieved (3.24\u20135.74\u2009mm DPARMs, <jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05). In the vertical direction, roots of maxillary anterior teeth achieved greater intrusion (0.70\u20130.93\u2009mm DPARMs, <jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05), while those of mandibular incisors achieved less intrusion (0.57\u20130.65\u2009mm DPARMs, <jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05) than predicted. In the mediolateral direction, lateral incisor roots did not move distally (\u22120.65 to \u22120.96\u2009mm DPARMs, <jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05), while those of canines did not move buccally, compared with the prediction (\u22120.75\u2009mm DPARMs, <jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>In the four first\u2010premolar extraction treatments with Invisalign, root movements were not achieved as predicted, particularly for anterior teeth in the anteroposterior direction.<\/jats:p><\/jats:sec>","DOI":"10.1111\/ocr.12842","type":"journal-article","created":{"date-parts":[[2024,8,13]],"date-time":"2024-08-13T17:44:33Z","timestamp":1723571073000},"page":"985-995","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["How accurate is predicted root movement achieved in four first\u2010premolar extraction cases with 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Medical Devices  Beijing China"},{"name":"Fourth Clinical Division Peking University School and Hospital of Stomatology  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jianhui","family":"Zhao","sequence":"additional","affiliation":[{"name":"Second Clinical Division Peking University School and Hospital of Stomatology  Beijing China"},{"name":"National Center for Stomatology, National Clinical Research Center for Oral Diseases National Engineering Research Center of Oral Biomaterials and Digital Medical Devices  Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianmin","family":"Xu","sequence":"additional","affiliation":[{"name":"National Center for Stomatology, National Clinical Research Center for Oral Diseases National Engineering Research Center of Oral Biomaterials and Digital Medical Devices  Beijing China"},{"name":"Department of Orthodontics Peking University School and Hospital of Stomatology  Beijing 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