Cone-beam computed tomography evaluation of upper airway, dental arches dimensions and buccolingual inclination through of cases treated with Damon System

• Autor(a) principal: Vieira, Bruno da Silva
• Data de Publicação: 2018
• Tipo de documento: Tese
• Idioma: eng
• Título da fonte: Biblioteca Digital de Teses e Dissertações da USP
• Texto Completo: https://www.teses.usp.br/teses/disponiveis/25/25144/tde-26112021-155423/
• topic: Aparelhos Ortodônticos; Cone-Beam Computed Tomography; Oropharynx; Orthodontic Brackets; Ortodontia; Tomografia Computadorizada de Feixe Cônico

Introduction: The aim of this study was to assess changes in upper airway, dental arches dimensions and buccolingual inclinations of teeth in patients treated orthodontically with the Damon system. Material and Methods: Twenty-one patients of both sexes, mean initial age of 14.99 ± 1.97 years, with complete permanent dentition up to second molars, treated with non-extractions and minimum initial crowding of 4mm (maxillary: -6.71 ± 2,99 mm, mandibular: -5,12 ± 2,03 mm were taken to CBCT scan before (T1) and after (T2) orthodontic treatment with the Damon System. The volume, sagittal area and minimum axial area of the upper airway were measured in sagittal and axial sections by means of the upper airways analysis tool of Dolphin Imaging® software. Buccolingual inclinations were performed using CBCT-panoramic cross-sectionals based on the image that presented the most appropriate view of buccal face of the clinical crown. Arches dimensions were measured by means of 2D axial and coronal sections in 3D reconstructions. The reference points used were buccal and mesiobuccal cusp tips for the premolars and molars respectively. Distribution of the variables was verified by Shapiro-Wilk test. Changes in all variables from T1 to T2 were compared using paired t-test. The correlation between the upper airway changes with buccolingual inclinations of teeth and arches dimensions was verified by the Pearson correlation coefficient. Results: There was a significant increase in maxillary interfirst premolar, intersecond premolar, interfirst molar and intersecond molar width and the length with significant incisors and premolars labial inclinations. In the mandibular arch there was a significant increase of intercanine, interfirst premolar, intersecond premolar, inferfirst molar and intersecond molar width with significant buccal inclination at posttreatment, exception of the canine and the first molar of the left side. There was no significant increase in the length of the mandibular arch. There was no statistically significant difference in upper airway sagittal area, minimum axial area and volume changes after treatment. Conclusion: It can be concluded that Damon System produced a significant transversal increase in the posterior region of the arches with differences in teeth buccolingual inclinations at posttreatment. There were no significant differences in the upper airways; however, there was a significant negative correlation between the changes of length of mandibular arch and the sagittal area and volume airway.