{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,11]],"date-time":"2026-09-11T02:30:58Z","timestamp":1789093858908,"version":"build-2803163510"},"reference-count":35,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2024,10,16]],"date-time":"2024-10-16T00:00:00Z","timestamp":1729036800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Oral. Health"],"abstract":"<jats:sec><jats:title>Background<\/jats:title><jats:p>Abnormal positioning and dislocation of the central incisor can disturb tooth eruption. Generally, inversely impacted maxillary central incisors do not erupt naturally. Performing traction and applied extrusion of an inversely impacted maxillary central incisor with a high inclination angle of the crown is challenging. This study aimed to examine the possibility of orthodontic treatment for severely inversely impacted maxillary central incisors in a series of case studies.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The inclination angle of the tooth crown, curvature of the tooth root, and length of the formed tooth root were measured using radiography. The teeth were then fenestrated and traction was applied using a lingual arch appliance with elastics.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The average crown axis inclination was 113\u00b0, the degree of root curvature was 97.3\u00b0, and the root formation was 36.1%. Although the crown axis inclination and root curvature were severe, all the incisors were aligned in the correct position as vital teeth through surgical and orthodontic treatments.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Traction should be performed in the early period of incisor development when root formation is not progressing, regardless of the tooth angle.<\/jats:p><\/jats:sec>","DOI":"10.3389\/froh.2024.1474190","type":"journal-article","created":{"date-parts":[[2024,10,16]],"date-time":"2024-10-16T05:13:06Z","timestamp":1729055586000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":5,"title":["Orthodontic management of severe inversely impacted maxillary central incisors: a case series"],"prefix":"10.3389","volume":"5","author":[{"given":"Yuriko","family":"Maruya","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryoko","family":"Hino","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Manami","family":"Tadano","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seira","family":"Hoshikawa","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shinji","family":"Otake","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuta","family":"Chiba","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kan","family":"Saito","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2024,10,16]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"378","DOI":"10.1016\/j.ajodo.2009.10.040","article-title":"Treatment of an impacted dilacerated maxillary central incisor","volume":"139","author":"Pavlidis","year":"2011","journal-title":"Am J Orthod Dentofacial Orthop"},{"key":"B2","doi-asserted-by":"publisher","first-page":"325","DOI":"10.1038\/sj.bdj.4803447","article-title":"Treatment of an inverted unerupted central incisor","volume":"138","author":"Rose","year":"1975","journal-title":"Br Dent J"},{"key":"B3","first-page":"245","article-title":"Autogenous transplantation of an unerupted maxillary central incisor","volume":"5","author":"Myers","year":"1981","journal-title":"J Pedod"},{"key":"B4","doi-asserted-by":"publisher","first-page":"406","DOI":"10.1016\/S0889-5406(99)70260-X","article-title":"Treatment of an impacted dilacerated maxillary central incisor","volume":"115","author":"Lin","year":"1999","journal-title":"Am J Orthod Dentofacial Orthop"},{"key":"B5","first-page":"121","article-title":"The sequelae of surgical exposure of unerupted teeth","volume":"38","author":"Azaz","year":"1980","journal-title":"J Oral Surg"},{"key":"B6","doi-asserted-by":"publisher","first-page":"510","DOI":"10.1043\/0003-3219(2006)076[0510:SCAADM]2.0.CO;2","article-title":"Severe crowding and a dilacerated maxillary central incisor in an adolescent","volume":"76","author":"Tanaka","year":"2006","journal-title":"Angle Orthod"},{"key":"B7","doi-asserted-by":"publisher","first-page":"132","DOI":"10.1043\/0003-3219(2004)074%3C0132:OTOAID%3E2.0.CO;2","article-title":"Orthodontic treatment of an impacted dilacerated maxillary central incisor combined with surgical exposure and apicoectomy","volume":"74","author":"Uematsu","year":"2004","journal-title":"Angle Orthod"},{"key":"B8","first-page":"375","article-title":"Orthodontic traction of an impacted maxillary central incisor","volume":"35","author":"Tanaka","year":"2001","journal-title":"J Clin Orthod"},{"key":"B9","doi-asserted-by":"publisher","first-page":"478","DOI":"10.1016\/0002-9416(82)90316-5","article-title":"Clinical assessment of injuries in orthodontic movement of impacted teeth. 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