无托槽隐形矫治技术远移下颌磨牙对上气道影响的研究

Abstract

Abstract: ABSTRACT: Objective to study the upper airway change of patients treated with mandibular molars distalization by clear aligner using CBCT and Dolphin software. Methods We select 20 cases treated with mandibular molars distalization by clear aligner, and before the treatment (T0) and the first mandibular molar distalization in place (T1) need shoot CBCT. Then Dolphin was used to rebuild 3D image data. According to anatomical structure, upper airway can be divided into four sections: nasopharynx, velopharyngeal, glossopharynge, laryngopharyngeal. Airway volumes, across-sectional area, the minimum cross-sectional area and height were measured[1]. All the data were analyzed by SPSS24.0. Results The height of nasopharynx, glossopharyngeum and laryngopharyngeal increased slightly, and the other parts showed a decreasing trend. The mean total volume of upper airway decreased 3322.63mm3 (P=0.285). The average cross-sectional area decreases 127.75mm2(P=0.577). The minimum cross-sectional area of oropharyngeal segment decreased 50.21mm2 on average (P=0. 406). The maximum height increase of the glossopharynge was 1.67mm(P=0.237). Velopharyngeal volume and cross-sectional area decreased by 1735.71 mm3 (P = 0. 236), 43.71mm2 (P = 0. 437)at most. The maximum decrease in the minimum cross-sectional area was in the laryngopharyngeal, with an average decrease of 23.75mm2 (P=0. 895). None of the data included in the study was statistically significant. Conclusion there was no significant effect on the volume, cross-sectional area, minimum cross-sectional area and height of the upper airway after mandibular molars distalization by clear aligner .

Key words: KEY WORDS: upper airway, mandibular molars distalization, clear aligner, CBCT

CLC Number:

R783.5

References 25

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The upper airway change of patients treated with Mandibular Molars Distalization by Clear Aligner

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