Introduction: The purpose of this study was to use cone-beam computed tomography to quantitatively evaluate the skeletal effects of rapid maxillary expansion and orthodontic treatment, with a specific interest in evaluating whether the skeletal changes achieved by RME will maintain throughout orthodontic treatment. Methods: Thirty consecutive patients (16 boys, 14 girls; mean age, 13.9 ± 1.8 years) who required RME with Hyrax appliances as part of their comprehensive orthodontic treatment were studied. Measurements before and after RME, and after orthodontic treatment, of palatal and buccal maxillary widths, palatal alveolar angle, nasal width, nasal floor width, and maxillary sinus width at C1, P1, P2, and M1 were compared by using Wilcoxon signed rank, Kruskal-Wallis, and Wilcoxon rank sum tests. Pearson correlation analyses were also performed (α = 0.05). Results: Widths measured for the maxillary buccal and palatal cortical plates post expansion and at the end of orthodontic treatment were statistically similar (P >.05). Nasal width and nasal floor width measured post-expansion to the end of orthodontic treatment were statistically similar (P >.05). Alveolar tipping statistically significantly increased (P <.001) with RME and then statistically significantly decreased when measured at the end of orthodontic treatment (P =.014). Increased age was significantly correlated with increased alveolar tipping (P =.002). Conclusions: Skeletal width increases of the maxillary alveolar ridge and nasal cavity were maintained after RME.
","abstract_html":"<p><strong>Introduction: </strong>The purpose of this study was to use cone-beam computed tomography to quantitatively evaluate the skeletal effects of rapid maxillary expansion and orthodontic treatment, with a specific interest in evaluating whether the skeletal changes achieved by RME will maintain throughout orthodontic treatment. <strong>Methods: </strong>Thirty consecutive patients (16 boys, 14 girls; mean age, 13.9 ± 1.8 years) who required RME with Hyrax appliances as part of their comprehensive orthodontic treatment were studied. Measurements before and after RME, and after orthodontic treatment, of palatal and buccal maxillary widths, palatal alveolar angle, nasal width, nasal floor width, and maxillary sinus width at C1, P1, P2, and M1 were compared by using Wilcoxon signed rank, Kruskal-Wallis, and Wilcoxon rank sum tests. Pearson correlation analyses were also performed (α = 0.05). <strong>Results: </strong>Widths measured for the maxillary buccal and palatal cortical plates post expansion and at the end of orthodontic treatment were statistically similar (P >.05). Nasal width and nasal floor width measured post-expansion to the end of orthodontic treatment were statistically similar (P >.05). Alveolar tipping statistically significantly increased (P <.001) with RME and then statistically significantly decreased when measured at the end of orthodontic treatment (P =.014). Increased age was significantly correlated with increased alveolar tipping (P =.002). <strong>Conclusions</strong>: Skeletal width increases of the maxillary alveolar ridge and nasal cavity were maintained after RME.</p>","abstract_has_math":false,"creators":["Ho, Chandler"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Orthodontics and Dentofacial Orthopedics","degree_department":null,"school":null,"contributors":["Rungcharassaeng, Kitichai","Caruso, Joseph M.","Leggitt, V. Leroy"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2014,"date_issued":"2014-09-01T07:00:00Z","date_published":"2014-09-01T07:00:00Z","updated_at":"2026-07-24T02:52:15Z","subjects":["Orthodontics and Orthodontology","Orthodontics; Orthodontics--Methods","Cone-beam Computed Tomography","Rapid Maxillary Expansion","Orthodontic Treatment"],"languages":["English"],"rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarsrepository.llu.edu/etd/164","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rungcharassaeng, Kitichai","Caruso, Joseph M.","Leggitt, V. Leroy"]},{"key":"dc:creator","label":"Author","values":["Ho, Chandler"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Orthodontics and Dentofacial Orthopedics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Orthodontics and Orthodontology","Orthodontics; Orthodontics--Methods","Cone-beam Computed Tomography","Rapid Maxillary Expansion","Orthodontic Treatment"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarsrepository.llu.edu/etd/164"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Introduction: The purpose of this study was to use cone-beam computed tomography to quantitatively evaluate the skeletal effects of rapid maxillary expansion and orthodontic treatment, with a specific interest in evaluating whether the skeletal changes achieved by RME will maintain throughout orthodontic treatment. Methods: Thirty consecutive patients (16 boys, 14 girls; mean age, 13.9 ± 1.8 years) who required RME with Hyrax appliances as part of their comprehensive orthodontic treatment were studied. Measurements before and after RME, and after orthodontic treatment, of palatal and buccal maxillary widths, palatal alveolar angle, nasal width, nasal floor width, and maxillary sinus width at C1, P1, P2, and M1 were compared by using Wilcoxon signed rank, Kruskal-Wallis, and Wilcoxon rank sum tests. Pearson correlation analyses were also performed (α = 0.05). Results: Widths measured for the maxillary buccal and palatal cortical plates post expansion and at the end of orthodontic treatment were statistically similar (P >.05). Nasal width and nasal floor width measured post-expansion to the end of orthodontic treatment were statistically similar (P >.05). Alveolar tipping statistically significantly increased (P <.001) with RME and then statistically significantly decreased when measured at the end of orthodontic treatment (P =.014). Increased age was significantly correlated with increased alveolar tipping (P =.002). Conclusions: Skeletal width increases of the maxillary alveolar ridge and nasal cavity were maintained after RME.
"]},{"key":"dc:title","label":"Title","values":["Skeletal Changes after Rapid Maxillary Expansion and Fixed Orthodontic Treatment: A CBCT Study"]}]}],"canonical_facts":{"dc:contributor":["Rungcharassaeng, Kitichai","Caruso, Joseph M.","Leggitt, V. Leroy"],"dc:creator":["Ho, Chandler"],"dc:description.abstract":["Introduction: The purpose of this study was to use cone-beam computed tomography to quantitatively evaluate the skeletal effects of rapid maxillary expansion and orthodontic treatment, with a specific interest in evaluating whether the skeletal changes achieved by RME will maintain throughout orthodontic treatment. Methods: Thirty consecutive patients (16 boys, 14 girls; mean age, 13.9 ± 1.8 years) who required RME with Hyrax appliances as part of their comprehensive orthodontic treatment were studied. Measurements before and after RME, and after orthodontic treatment, of palatal and buccal maxillary widths, palatal alveolar angle, nasal width, nasal floor width, and maxillary sinus width at C1, P1, P2, and M1 were compared by using Wilcoxon signed rank, Kruskal-Wallis, and Wilcoxon rank sum tests. Pearson correlation analyses were also performed (α = 0.05). Results: Widths measured for the maxillary buccal and palatal cortical plates post expansion and at the end of orthodontic treatment were statistically similar (P >.05). Nasal width and nasal floor width measured post-expansion to the end of orthodontic treatment were statistically similar (P >.05). Alveolar tipping statistically significantly increased (P <.001) with RME and then statistically significantly decreased when measured at the end of orthodontic treatment (P =.014). Increased age was significantly correlated with increased alveolar tipping (P =.002). Conclusions: Skeletal width increases of the maxillary alveolar ridge and nasal cavity were maintained after RME.
"],"dc:identifier":["https://scholarsrepository.llu.edu/etd/164"],"dc:language":["English"],"dc:rights":["This title appears here courtesy of the author, who has granted Loma Linda University a limited, non-exclusive right to make this publication available to the public. The author retains all other copyrights."],"dc:subject":["Orthodontics and Orthodontology","Orthodontics; Orthodontics--Methods","Cone-beam Computed Tomography","Rapid Maxillary Expansion","Orthodontic Treatment"],"dc:title":["Skeletal Changes after Rapid Maxillary Expansion and Fixed Orthodontic Treatment: A CBCT Study"],"thesis:degree_discipline":["Orthodontics and Dentofacial Orthopedics"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T02:52:15Z"}