{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,29]],"date-time":"2026-05-29T15:05:57Z","timestamp":1780067157857,"version":"3.54.0"},"reference-count":54,"publisher":"The Angle Orthodontist (EH Angle Education & Research Foundation)","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec id=\"st1\">\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>To evaluate whether the amount of rapid maxillary expansion differentially affects the skeletal and dentoalveolar changes that occur.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"st2\">\n                    <jats:title>Materials and Methods<\/jats:title>\n                    <jats:p>This randomized controlled trial included 23 patients who had rapid maxillary expansion (RME). Subjects were randomly assigned to a conventional expansion control group (n = 12) or an overexpansion group (n = 11), who started treatment at 13.2 \u00b1 1.5 and 13.8 \u00b1 1 years of age, respectively. Cone beam computed tomography scans (11 cm) were obtained prior to rapid maxillary expander (RME) delivery and approximately 3.7 months later. Initial hand-wrist radiographs were used to determine the participants' skeletal maturity.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"st3\">\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The RME screws were activated 5.6 \u00b1 1.2 mm and 10.1 \u00b1 0.6 mm in the conventional and overexpansion groups, respectively. Overexpansion produced significantly greater expansion of the nasal cavity (2.1X\u20132.5X), maxillary base (2.3X), buccal alveolar crest (1.4X), and greater palatine foramina (1.9X). Significantly greater intermolar width increases (1.8X) and molar inclination (2.8X) changes were also produced. The nasal cavity and maxillary base expanded 23%\u201332% as much as the screws were activated. Skeletal expansion was positively correlated with RME screw activation (R = 0.61 to 0.70) and negatively correlated (R = \u22120.56 to \u22120.64) with the patients' skeletal maturation indicators (SMIs). Together, screw activation and the patients' SMI scores explained 48%\u201366% of the variation in skeletal expansion.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec id=\"st4\">\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>This pilot study shows that overexpansion produces greater changes than conventional expansion, with greater skeletal effects among less mature patients.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2319\/032921-243.1","type":"journal-article","created":{"date-parts":[[2021,8,13]],"date-time":"2021-08-13T14:37:04Z","timestamp":1628865424000},"page":"55-63","source":"Crossref","is-referenced-by-count":3,"title":["Short-term skeletal and dentoalveolar effects of overexpansion:"],"prefix":"10.2319","volume":"92","author":[{"given":"Arun K.","family":"Bala","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Phillip M.","family":"Campbell","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Larry P.","family":"Tadlock","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emet D.","family":"Schneiderman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter H.","family":"Buschang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1164","reference":[{"key":"i1945-7103-92-1-55-b01","series-title":"Dent Cosmos","first-page":"540","article-title":"Treatment of irregularity of the permanent or adult teeth","volume":"1","author":"Angle","year":"1860","unstructured":"Angle\n              EH.\n            \n          \n          Treatment of irregularity of the permanent or adult teeth.\n\t\t\t\t\tDent Cosmos.\n\t\t\t\t\t1860;\n\t\t\t\t\t1:\n\t\t\t\t\t540\u2013\n\t\t\t\t\t544."},{"key":"i1945-7103-92-1-55-b02","series-title":"Angle Orthod","first-page":"343","article-title":"Treatment timing for rapid maxillary expansion","volume":"71","author":"Baccetti","year":"2001","unstructured":"Baccetti\n              T,\n            \n            \n              Franchi\n              L,\n            \n            \n              Cameron\n              CG,\n            \n            \n              McNamara\n              JA.\n            \n          \n          Treatment timing for rapid maxillary expansion.\n\t\t\t\t\tAngle Orthod.\n\t\t\t\t\t2001;\n\t\t\t\t\t71:\n\t\t\t\t\t343\u2013\n\t\t\t\t\t350."},{"key":"i1945-7103-92-1-55-b03","series-title":"Am J Orthod Dentofacial Orthop","first-page":"3","article-title":"Maxillary expansion: Clinical implications","volume":"91","author":"Bishara","year":"1987","unstructured":"Bishara\n              S,\n            \n            \n              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nasomaxillary complex one year after rapid maxillary expansion as the only intervention: a controlled study.\n\t\t\t\t\tDental Press J Orthod.\n\t\t\t\t\t2014;\n\t\t\t\t\t19:\n\t\t\t\t\t79\u2013\n\t\t\t\t\t87."},{"key":"i1945-7103-92-1-55-b13","series-title":"Angle Orthod","first-page":"548","article-title":"Rapid maxillary expansion - tooth tissue-borne versus tooth-borne expanders: a computed tomography evaluation of dentoskeletal effects","volume":"75","author":"Garib","year":"2005","unstructured":"Garib\n              DG,\n            \n            \n              Castanha Henriques\n              JF,\n            \n            \n              Janson\n              G,\n            \n            \n              Freitas\n              MR,\n            \n            \n              Coelho\n              RA.\n            \n          \n          Rapid maxillary expansion - tooth tissue-borne versus tooth-borne expanders: a computed tomography evaluation of dentoskeletal 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Treatment timing for rapid maxillary expansion.\n\t\t\t\t\tAngle Orthod.\n\t\t\t\t\t2001;\n\t\t\t\t\t71:\n\t\t\t\t\t343\u2013\n\t\t\t\t\t350."},{"key":"i1945-7103-92-1-55-b03","series-title":"Am J Orthod Dentofacial Orthop","first-page":"3","article-title":"Maxillary expansion: Clinical implications","volume":"91","author":"Bishara","year":"1987","unstructured":"Bishara\n              S,\n            \n            \n              Staley\n              R.\n            \n          \n          Maxillary expansion: Clinical implications.\n\t\t\t\t\tAm J Orthod Dentofacial Orthop.\n\t\t\t\t\t1987;\n\t\t\t\t\t91:\n\t\t\t\t\t3\u2013\n\t\t\t\t\t14."},{"key":"i1945-7103-92-1-55-b04","series-title":"Angle Orthod","first-page":"73","article-title":"Rapid expansion of the maxillary dental arch and nasal cavity by opening the midpalatal suture","volume":"31","author":"Haas","year":"1961","unstructured":"Haas\n              AJ.\n            \n          \n          Rapid expansion of the maxillary dental arch and nasal cavity by opening the midpalatal suture.\n\t\t\t\t\tAngle Orthod.\n\t\t\t\t\t1961;\n\t\t\t\t\t31:\n\t\t\t\t\t73\u2013\n\t\t\t\t\t90."},{"key":"i1945-7103-92-1-55-b05","series-title":"Angle Orthod","first-page":"189","article-title":"Long-term posttreatment evaluation of rapid palatal expansion","volume":"50","author":"Haas","year":"1980","unstructured":"Haas\n              AJ.\n            \n          \n          Long-term posttreatment evaluation of rapid palatal expansion.\n\t\t\t\t\tAngle Orthod.\n\t\t\t\t\t1980;\n\t\t\t\t\t50:\n\t\t\t\t\t189\u2013\n\t\t\t\t\t217."},{"key":"i1945-7103-92-1-55-b06","series-title":"Am J Orthod Dentofacial Orthop","first-page":"268","article-title":"Rapid maxillary expansion in the deciduous and mixed dentition evaluated through posteroanterior cephalometric analysis","volume":"107","author":"Silva Filho","year":"1995","unstructured":"Silva Filho\n              OG,\n            \n            \n              Prado Montes\n          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tomography dental measurements","volume":"136","author":"Baumgaertel","year":"2009","unstructured":"Baumgaertel\n              S,\n            \n            \n              Palomo\n              JM,\n            \n            \n              Palomo\n              L,\n            \n            \n              Hans\n              MG.\n            \n          \n          Reliability and accuracy of cone-beam computed tomography dental measurements.\n\t\t\t\t\tAm J Orthod Dentofacial Orthop.\n\t\t\t\t\t2009;\n\t\t\t\t\t136:\n\t\t\t\t\t19\u2013\n\t\t\t\t\t25."},{"key":"i1945-7103-92-1-55-b09","series-title":"Eur J Orthod","first-page":"519","article-title":"Effect of rapid maxillary expansion on skeletal, dental, and nasal structures: a postero-anterior cephalometric study","volume":"22","author":"Cross","year":"2000","unstructured":"Cross\n              DL,\n            \n            \n              McDonald\n              JP.\n            \n          \n          Effect of rapid maxillary 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study","volume":"19","author":"Baratiera","year":"2014","unstructured":"Baratiera\n              CL,\n            \n            \n              Alves\n              M,\n              Jr.,\n            \n            \n              Mattos\n              CT,\n            \n            \n              Lau\n              GWT,\n            \n            \n              Nojma\n              LI,\n            \n            \n              de Souza\n              MMG.\n            \n          \n          Transverse effects on the nasomaxillary complex one year after rapid maxillary expansion as the only intervention: a controlled study.\n\t\t\t\t\tDental Press J Orthod.\n\t\t\t\t\t2014;\n\t\t\t\t\t19:\n\t\t\t\t\t79\u2013\n\t\t\t\t\t87."},{"key":"i1945-7103-92-1-55-b13","series-title":"Angle Orthod","first-page":"548","article-title":"Rapid maxillary expansion - tooth tissue-borne versus tooth-borne expanders: a computed tomography evaluation of dentoskeletal effects","volume":"75","author":"Garib","year":"2005","unstructured":"Garib\n              DG,\n            \n            \n              Castanha Henriques\n              JF,\n            \n            \n              Janson\n              G,\n            \n            \n              Freitas\n              MR,\n            \n            \n              Coelho\n              RA.\n            \n          \n          Rapid maxillary expansion - tooth tissue-borne versus tooth-borne expanders: a computed tomography evaluation of dentoskeletal effects.\n\t\t\t\t\tAngle Orthod.\n\t\t\t\t\t2005;\n\t\t\t\t\t75:\n\t\t\t\t\t548\u2013\n\t\t\t\t\t557."},{"key":"i1945-7103-92-1-55-b14","series-title":"Am J Orthod Dentofacial Orthop","first-page":"8","article-title":"Skeletal effects to the maxilla after rapid maxillary expansion assessed with cone-beam computed tomography","volume":"134","author":"Garrett","year":"2008","unstructured":"Garrett\n              BJ,\n            \n            \n      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pilot randomized controlled trial"],"short-title":[],"issued":{"date-parts":[[2022,1]]},"references-count":54,"journal-issue":{"issue":"1"},"URL":"https:\/\/doi.org\/10.2319\/032921-243.1","relation":{},"ISSN":["1945-7103","0003-3219"],"issn-type":[{"value":"1945-7103","type":"electronic"},{"value":"0003-3219","type":"print"}],"subject":[],"published":{"date-parts":[[2022,1]]}}}