Cone-Beam Computed Tomography Evaluation of Temporomandibular Changes after Orthognathic Surgery

• Main Authors: Yi-Jen Liu, 劉懿真
• Other Authors: 姚宗珍
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/bbu948

碩士 === 國立臺灣大學 === 臨床牙醫學研究所 === 106 === Purpose: The aim of the present study was to use cone-beam computed tomographic images to investigate the displacement and morphological changes of temporomandibular joints in patients who received orthodontic treatment combined with orthognathic surgery. Materials and Methods: Fifty-one patients who received orthodontic treatment combined with orthognathic surgery were recruited for this study. The patients were divided in to two groups: Angle’s Class III malocclusion group (n = 34) and Angle’s Class II malocclusion group (n = 17). All patients took cone-beam computed tomography scans before and after treatments. Overall and regional superimposition of the cone-beam computed tomographic data was done. The outcome variables were the linear and angular measurement changes of temporomandibular joints in axial, coronal, and sagittal planes. Paired t-test was used to measurements within Angle’s Class III and Class II malocclusion groups. Two-sample t-test was used to measurements between Angle’s Class III and Class II malocclusion groups. Pearson&apos;&apos;s correlation coefficient was used to correlate the changes of temporomandibular joints and amount of mandibular setback or advancement. The threshold significance for data was P < 0.05, corrected using false discovery rate correction for multiple comparisons Results and Conclusions: The changes of C points (the deepest point of sigmoid notch) were within 2 mm. The axial ramal angle increased in Angle’s Class III malocclusion group, and decreased in Angle’s Class II malocclusion group. There was no significant condylar change in Angle’s Class III malocclusion group. Significant condylar changes of widths and lengths were noted in Angle’s Class II malocclusion group. There was no statistically significant correlation between the angular changes of mandibular proximal segments and the amount of mandibular setback or advancement. The linear changes of condyle in Angle’s Class III and Class II malocclusion groups had no statistically significant correlation with the amount of mandibular movement.