Chandler Ho


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.

LLU Discipline

Orthodontics and Dentofacial Orthopedics


Orthodontics and Dentofacial Orthopedics


School of Dentistry

First Advisor

Rungcharassaeng, Kitichai

Second Advisor

Caruso, Joseph M.

Third Advisor

Leggitt, V. Leroy

Degree Name

Master of Science (MS)

Degree Level


Year Degree Awarded


Date (Title Page)




Library of Congress/MESH Subject Headings

Orthodontics; Orthodontics--Methods

Subject - Local

Cone-beam Computed Tomography; Rapid Maxillary Expansion; Orthodontic Treatment



Page Count


Digital Format


Digital Publisher

Loma Linda University Libraries

Usage 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.


Loma Linda University Electronic Theses and Dissertations

Collection Website


Loma Linda University. Del E. Webb Memorial Library. University Archives