Paper language: English
Effect of premolar extraction on upper airway volume and hyoid position in hyperdivergent adults with different mandibular length
AUTHOR: Ruoyu Ning, Jing Guo, and Domingo Martin
English abstractIntroduction: The objective of this study was to investigate the morphological changes of the upper airway andthe position of the hyoid bone in hyperdivergent adults with different mandibular lengths after premolar extrac- tion. Materials: The data of 57 hyperdivergent adults, aged 20-35 years, who had 4 premolar extractions wereincluded for the study. Mandibular length (CoGn) was used for grouping (A: long CoGn, B: short CoGn). Pretreat- ment and posttreatment lateral cephalograms and cone-beam computed tomography images were used toassess the position of mandible, hyoid bone, and upper airway using paired t test. An independent sample t test was used to detect changes of the airway and hyoid position between groups A and B. Pearson correlation analysis was applied to estimate the correlation between pharyngeal spaces and dentoskeletal morphology at P�.05. Results: In all subjects, we observed retraction of the upper incisors, mesial movement of the lower molars, and reduction of the mandibular planes. In group A, differences were found in anterior and posterior movements of the hyoid bone, increase of airway volume, minimum cross-sectional area (MCA) and anteroposterior linear distance (APL) (P �.05). There were notable differences in the change of hyoid position, airway volume, MCA, and APL between group A and group B. Glossopharyngeal and hypopharyngeal volumes, MCA, and APL were correlated with articular angle, mandibular plane, and hyoidbone position (P�.05). Conclusions: With a comprehensive diagnosis and treatment, premolar extraction in hy- perdivergent adults withfavorable CoGn canfacilitate improvement of esthetics, hyoid bone position, andthe increasein glossopharyngeal and hypopharyngeal volumes and MCA. (Am J Orthod Dentofacial Orthop 2022;-:e1-e10)
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1st FACE online symposium
The world is changing and in FACE, following tradition, we wont be left behind.
As we all know, we can’t travel or meet, so once again, we will take advantage of technology to turn the situation around.
«Work hard, play hard«
Two days full of experiences, thanks to the participation of 20 different clinics.
We’ll see you on February 26 and 27