JANE CHUNG-CHEN YAOJANG-JAER LEEChen H.-Y.JENNY ZWEI-CHIENG CHANGChang H.-F.YI-JANE CHEN2021-10-082021-10-0820050003-3219https://www.scopus.com/inward/record.uri?eid=2-s2.0-24744443951&partnerID=40&md5=df7379dfeac14b31943204d110ddb283https://scholars.lib.ntu.edu.tw/handle/123456789/584279The intrusion of an overerupted maxillary molar using traditional orthodontic treatment is a real challenge. The aim of this study was to investigate the envelope of intrusive movements of a maxillary molar in cases using mini-implants as anchorage with partial or full-mouth fixed edgewise appliances. The cusp tips of the pretreatment and postintrusion dental casts were recorded by a three-dimensional (3D) digitizer. The 3D data of the serial dental casts were analyzed to distinguish the direction and magnitude of individual tooth movement. The mean intrusive movement of the maxillary first molars was three to four mm, with a maximum of over eight mm. For the adjacent maxillary second molars and second premolars, the amount of intrusion was two mm and 1-2 mm, respectively. This study demonstrated that significant true intrusion of maxillary molars could be obtained in a well-controlled manner by using fixed appliances with titanium mini-implants as bony anchorage. ? 2005 by The EH Angle Education and Research Foundation, Inc.[SDGs]SDG3adolescent; adult; article; bone plate; bone screw; dental care; electronics; female; hard palate; human; instrumentation; jaw; male; maxilla; molar tooth; orthodontic device; orthodontics; pathophysiology; periodontal disease; prostheses and orthoses; retrospective study; three dimensional imaging; tooth eruption; Adolescent; Adult; Alveolar Process; Bone Plates; Bone Screws; Dental Models; Female; Humans; Imaging, Three-Dimensional; Male; Maxilla; Miniaturization; Molar; Orthodontic Anchorage Procedures; Orthodontic Appliance Design; Orthodontic Appliances; Palate, Hard; Prostheses and Implants; Retrospective Studies; Tooth Eruption; Tooth Movementjournal article162798222-s2.0-24744443951