| Objective:The aims of the present study were to compare the3D upper airway volume of the early permanent dentition patients in Class â…¡ division1malocclusion with that in Class â… malocclusion and to investigate possible significant relationships and correlations between upper airway volume and mandibular morphology using CBCT.Methods:Sixty early permanent dentition patients (age11.85±0.78years;26males,34females) with Class â…¡ division1(n=30) and Class â… (n=30) malocclusion were included in this study. All subjects were taken lateral cephalograms and CBCT scans (Galileos, Sirona) before treatment. The CBCT scans were transferred to MIMICS16.0software, and measurements were taken on mid-sagittal sections of the upper airway and transverse sections of the mandible. Fourteen parameters were measured to define the volume of the upper airway, the area, width and length of posterior airway space (PAS, the most constricted space behind the base of the tongue and limited by soft tissues), and the width and length of mandible. Statistical comparison of the upper airway volume between the two groups was performed by using an independent samples t-test. Pearson coefficient was performed to check the correlations between upper airway volume and mandibular morphology.Results: 1. There were no statistically significant differences (p>0.05) between all variables when compared by sexes.2. The upper airway volume (palatopharynx, glussopharynx, oropharynx, laryngopharynx and the total upper airway volume) was significantly smaller in Class â…¡ division1malocclusion patients than in Class â… malocclusion ones(p<0.05). There were no statistically significant differences (p>0.05) of the nasopharynx between two groups.3. The area, width and length of PAS was significantly smaller in Class â…¡ division1malocclusion patients than in Class â… malocclusion ones (p<0.05).4. Pearson coefficient showed significantly positive correlations (p<0.01) between upper airway volume and mandibular body length, except the nasopharynx. No statistically significant relationships (p>0.05) were found between nasopharyngeal volume and mandibular body length.5. Positive correlations were found respectively between mandibular body length and parameters of PAS like the area and width(p<0.05), but such correlation was not proved between mandibular length and the length of PAS(p>0.05).6. There were no statistically significant relationships between upper airway volume and mandibular basal bone width as checked by Pearson coefficient (p>0.05).Conclusion:The CBCT evaluation showed that the upper airway volume except nasopharynx was significantly smaller in Class â…¡ division1malocclusion patients than in Class â… malocclusion patients. And there were significantly positive correlations between upper airway volume and mandibular body length. |
PDF Full Text Request