Date of Completion
Sumit Yadav; Madhur Upadhyay; Aditya Tadinada
Field of Study
Master of Dental Science
Objectives: To evaluate the long-term effects on the airway and bone in patients that have undergone BA, TA and control with 3D cone beam computed tomography (CBCT) analysis. Materials and Methods: 180 CBCTs were analyzed for 60 patients at pretreatment (T1), post expansion (T2), and post-treatment (T3). Patients were divided into three groups, bone anchored expansion (BA), tooth anchored expansion (TA) and a control group. For the airway portion of the study, the nasal cavity, nasopharyngeal, oropharyngeal and laryngopharyngeal, and total airway volumes were measured. Total airway area, minimal cross-sectional area, maxillary intermolar, external maxillary and palatal widths were also examined. For the bone portion of the study, intermolar width, palatal width, molar angulation, vertical bone height, and buccal bone thickness at the alveolar crest and root apex were measured. Results: Both BA and TA caused a significant increase in the airway parameters short-term but when examining long-term results, there were no significant differences in the airway parameters between the three groups except for the nasopharyngeal volume and palatal width parameters.. Both BA and TA resulted in significant increases in the intermolar width, molar angulation, palatal width, vertical bone height and buccal bone thickness at the root apex short-term. Long-term examination showed similar trends to that seen in the short term for both BA and TA groups. However, in the control group, there were significant increases in the intermolar width and decrease in the buccal bone thickness at the root apex. When comparing the end results with pre-treatment measurements, there was still a significant decrease in the vertical bone heights in the BA and TA groups. Conclusions: There were significant increases in the total airway volume and area, minimal cross-sectional area with BA and TA immediately post-expansion but by post-treatment, the changes seen in the airway and bone parameters in the BA and TA groups were similar to the changes seen in the control group. The only differences seen long-term were that the BA group led to a significant increase in the nasopharyngeal volume and that the BA and TA groups led to significant decreases in the vertical bone heights.
Wang, Dennis, "Alveolar Bone and Airway Changes in Different Maxillary Expansion Treatments: A 3D Cone-beam Tomography Study" (2020). Master's Theses. 1529.