成人骨性Ⅰ类患者拔牙强支抗矫治前后上气道形态变化的CBCT研究

doi:10.13591/j.cnki.kqyx.2022.10.006

Abstract

Abstract: Objective To observe the effect of orthodontic extraction treatment of first premolar with strong anchorage on morphological changes of upper airway in adult patients with skeletal Class Ⅰ bimaxillary protrusion with different vertical skeletal patterns by Dolphin software and CBCT. Methods Fifty-six adult patients with bimaxillary protrusion treated from January 2016 to December 2021 were selected. All subjects extracted 4 first premolars and retracted the anterior teeth with strong anchorage. The patients were divided into high angle group, average angle group and low angle group according to SN-MP. The collected CBCT scans before and after treatment were reconstructed by using Dolphin software for measuring the airway volumes of velopharynx, glossopharynx, laryngopharynx and the minimum cross-sectional of oropharynx. Results Measurements of 56 adult patients showed that the minimum cross-sectional area of oropharynx in low angle group and high angle group was significantly smaller than that in average angle group. There was no significant difference in airway volume of velopharynx, glossopharynx and laryngopharynx among three groups. Furthermore, three-dimensional analysis of the upper airway showed that there was no significant difference in the airway volume before and after treatment in each group. The minimum cross-sectional area of oropharynx in low angle group and average angle group decreased significantly after treatment, but there was no significant difference in high angle group before and after treatment. Conclusion Based on CBCT evidence, for high angle adult patients with bimaxillary protrusion who will receive orthodontic extraction treatment, the orthodontist should pay attention to the control of vertical direction to prevent further reduction of the upper airway. For patients with low and average angle, when making the treatment plan, we should consider the patient′s face profile and morphology of upper airway.

Key words: orthodontic extraction treatment, upper airway, bimaxillary protrusion, skeletal Class Ⅰ

CLC Number:

R783.5

TANG Huan, BAO Han, YU Chenhao, SHEN Huijie, WANG Wei, YAN Bin. CBCT study on morphological changes of upper airway after orthodontic extraction treatment with strong anchorage in adult skeletal Class Ⅰ patients[J]. Stomatology, 2022, 42(10): 895-899.

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CBCT study on morphological changes of upper airway after orthodontic extraction treatment with strong anchorage in adult skeletal Class Ⅰ patients

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