{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,16]],"date-time":"2026-09-16T02:24:56Z","timestamp":1789525496908,"version":"build-2803163510"},"reference-count":35,"publisher":"Oxford University Press (OUP)","issue":"6","license":[{"start":{"date-parts":[[2021,8,4]],"date-time":"2021-08-04T00:00:00Z","timestamp":1628035200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2021,12,1]]},"abstract":"<jats:title>Summary<\/jats:title>\n               <jats:sec>\n                  <jats:title>Aim<\/jats:title>\n                  <jats:p>To compare root resorption (RR) after rapid maxillary expansion (RME) and slow maxillary expansion (SME) through micro-computed tomography (micro-CT).<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Subjects and methods<\/jats:title>\n                  <jats:p>Twenty-six subjects who required maxillary expansion and bilateral upper first premolar extraction were randomly assigned to RME (n = 13, mean age: 13.25 \u00b1 0.88 years) or SME (n = 13, mean age: 13.53\u00b11.28 years) group. A hyrax-type acrylic bonded expansion appliance was used. The Hyrax screw was activated \u00bc turn twice a day for 20 days in the RME group and \u00bc turn every second day for 80 days in the SME group. One randomly selected upper first premolar was extracted in each patient after active expansion. The appliance was left in situ for a 24-week retention period then the contralateral upper first premolar was extracted. Extracted teeth were scanned with micro-CT and the volume of the resorption craters was analysed with a specialized software. Transversal skeletal and dental widths were measured on posteroanterior radiographs taken before and after expansion and retention periods.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Results<\/jats:title>\n                  <jats:p>The resorption craters were concentrated mostly on the buccal surface and middle level in all samples. The total RR in the RME group was less post-expansion (P \u2264 0.05) and more post-retention (P &amp;gt; 0.05) than the SME group. During retention, there was a significant decrease in the total RR in the SME group (P &amp;gt; 0.05) and an increase in the RME group. Both RME and SME groups displayed a similar increase in skeletal transverse dimensions, but inter-molar width increased significantly more in the SME group during the whole experimental period.<\/jats:p>\n               <\/jats:sec>\n               <jats:sec>\n                  <jats:title>Conclusion<\/jats:title>\n                  <jats:p>RME does not have an advantage over SME in terms of skeletal expansion and the amount of RR when a retention period of six months is followed.<\/jats:p>\n               <\/jats:sec>","DOI":"10.1093\/ejo\/cjab024","type":"journal-article","created":{"date-parts":[[2021,4,23]],"date-time":"2021-04-23T12:38:48Z","timestamp":1619181528000},"page":"682-689","source":"Crossref","is-referenced-by-count":11,"title":["Effects of rapid and slow maxillary expansion on root resorption: a micro-computed tomography study"],"prefix":"10.1093","volume":"43","author":[{"given":"Canan","family":"Colak","sequence":"first","affiliation":[{"name":"Orthodontist, Private Practice, Esentepe Mah. FSM Bulvari Bahar Sitesi A Blok No: 96\/5 Nil\u00fcfer\/Bursa, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Banu","family":"Aras","sequence":"additional","affiliation":[{"name":"Orthodontist, Former Senior Dental Registrar, Sydney Dental Hospital, Sydney, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lam L","family":"Cheng","sequence":"additional","affiliation":[{"name":"Department of Orthodontics and Paediatric Dentistry, Sydney Dental School, Faculty of Medicine and Health, University of Sydney, Sydney Dental Hospital, Sydney Local Health District, Sydney, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Selma","family":"Elekdag-Turk","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tamer","family":"Turk","sequence":"additional","affiliation":[{"name":"Department of Orthodontics, Faculty of Dentistry, Ondokuz Mayis University, Samsun, Turkey"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M Ali","family":"Darendeliler","sequence":"additional","affiliation":[{"name":"Department of Orthodontics and Paediatric Dentistry, Sydney Dental School, Faculty of Medicine and Health, University of Sydney, Sydney Dental Hospital, Sydney Local Health District, Sydney, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2021,8,4]]},"reference":[{"key":"2021120504342852900_CIT0001","first-page":"540","article-title":"Treatment of irregularity of the permanent or adult teeth","volume":"1","author":"Angell","year":"1860","journal-title":"Dent Cosmos"},{"key":"2021120504342852900_CIT0002","first-page":"73","article-title":"Rapid expansion of the maxillary dental arch and nasal cavity by opening the mid-palatal suture","volume":"31","author":"Haas","year":"1961","journal-title":"Angle Orthod"},{"key":"2021120504342852900_CIT0003","doi-asserted-by":"crossref","first-page":"428.e1","DOI":"10.1016\/j.ajodo.2007.02.052","article-title":"Factors affecting buccal bone changes of maxillary posterior teeth after rapid maxillary expansion","volume":"132","author":"Rungcharassaeng","year":"2007","journal-title":"American Journal of Orthodontics and Dentofacial Orthopedics,"},{"key":"2021120504342852900_CIT0004","doi-asserted-by":"crossref","first-page":"933","DOI":"10.1016\/j.sleep.2015.04.012","article-title":"Rapid maxillary expansion (RME) for pediatric obstructive sleep apnea: a 12-year follow-up","volume":"16","author":"Pirelli","year":"2015","journal-title":"Sleep Medicine,"},{"key":"2021120504342852900_CIT0005","doi-asserted-by":"crossref","first-page":"11","DOI":"10.1093\/ejo\/cjp057","article-title":"Maxillary expansion in the mixed dentition: rapid or semi-rapid?","volume":"32","author":"Ramoglu","year":"2010","journal-title":"European Journal of Orthodontics,"},{"key":"2021120504342852900_CIT0006","doi-asserted-by":"crossref","first-page":"321","DOI":"10.1016\/S0889-5406(97)70191-4","article-title":"Skeletal and dental changes after maxillary expansion in the mixed dentition","volume":"111","author":"Sandik\u00e7io\u011flu","year":"1997","journal-title":"American Journal of Orthodontics and Dentofacial Orthopedics,"},{"key":"2021120504342852900_CIT0007","volume-title":"Contemporary Orthodontics","author":"Proffit","year":"2007","edition":"4"},{"key":"2021120504342852900_CIT0008","first-page":"261","article-title":"Forces produced by rapid maxillary expansion. 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