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Comparison of Skeletal and Dental Changes Obtained from a Tooth-Borne Maxillary Expansion Appliance Compared to the Damon System Assessed Through a Digital Volumetric Imaging
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- Author / Creator
- Nam, Hye Jin
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Introduction: The purpose of this thesis was to evaluate and compare dental and skeletal changes associated with the Damon and Rapid Maxillary Expander (RME) expansion over 6 months using a Cone-Beam Computed Tomography (CBCT).
Methods: A sample of 82 patients were randomly allocated to either Group A or B (41 patients in each group). Patients in Group A received orthodontic treatment using the Damon system (self-ligating brackets). Patients in Group B received treatment using the Hyrax (a type of RME) appliance for 6 months, and then non self-ligating brackets were used to complete the orthodontic treatment. CBCT images were taken two times (baseline and six months into treatment). The AVIZO software was used to locate 18 landmarks (dental and skeletal) on sagittal, axial, and coronal slices of CBCT images.
Results: Comparison between two groups showed that transverse movement of maxillary first molars and premolars were much greater in the Hyrax group. The lateral movements of posterior teeth were associated with buccal tipping of crowns. No clinically significant difference in the vertical or antero-posterior direction between two groups was noted. Alveolar bone next to root apex of maxillary first premolar and molar teeth showed clinically significant lateral movement in the Hyrax group only.
Conclusion: Comparison between two groups showed significantly greater transverse expansion of the first molar and first premolars with buccal tipping in the RME group. No significant changes were noted in any skeletal landmarks except alveolar bone next to root apex of maxillary first premolar and molar teeth, suggesting a possible bone apposition following teeth movement
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- Subjects / Keywords
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- Graduation date
- Fall 2019
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
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