A CBCT study of upper airway changes in patients with Forsus appliance for Class Ⅱ malocclusion
Objective To explore the changes of the upper airway before and after the treatment of patients with Class Ⅱ malocclusion during the growth and development period with Forsus appliance.Methods A total of 44 patients with Class Ⅱ malocclusion mandibular retraction were enrolled.The experimental group was treated with Forsus appliance and straight wire appliance,and the control group was not treated with functional correction.Cone beam computed tomography(CBCT)was taken anteriorly and posteriorly,and the data were measured by Invivo 5 software and Dolphin software.The data were statistically analyzed by SPSS22.0 statistical software.Results After treatment,the total upper airway volume,velopharyngeal volume and oropharyngeal volume increased,the cross-sectional area at the soft palate apical plane,the minimum cross-sectional area of the oropharyngeal airway,the sagittal transverse diameter ratio at the hard palate plane increased,and the sagittal transverse diameter ratio at the soft palatine apical plane decreased,and there were statistical differences before and after treatment(P＜0.05),and there were statistical differences between groups(P＜0.05).Conclusion The use of Forsus appliance in the treatment of adolescents with Class Ⅱ mandibular retraction can increase the volume of the upper airway and improve the ventilation function of the patients,and its impact on the velopharyngeal airway is the most prominent.
NETL
NSTL
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