Aldosari Mohammad A, Alqasir Abdulmohsen M, Alqahtani Nasser D, Almosa Naif A, Almoammar Khalid A, Albarakati Sahar F
Department of Pediatric Dentistry and Orthodontics, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Orthodontic Resident, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
Saudi Dent J. 2020 Mar;32(3):142-147. doi: 10.1016/j.sdentj.2019.11.004. Epub 2019 Nov 20.
BACKGROUND & OBJECTIVES: Previous studies have found that first premolar extractions during orthodontic treatment may alter the upper airway dimensions. The objective of this study is to investigate the effects of second premolar extraction during orthodontic treatment on the dimensions of the upper airway in a sample of female adults.
Twenty-nine female adult patients with ages between 18 and 30 years old and incisor bimaxillary protrusion were included in this study. They were treated with comprehensive orthodontic treatment which included the extraction of four second premolars. Pre and post cephalometric radiographs were analyzed using Dolphin imaging software for changes in tongue length and height, soft palate thickness and length, the superior, middle, and inferior airway space, and vertical airway length. Descriptive statistics were used to characterize measurements. Student's paired -test was preformed to compare the pre- and post-test mean values of the dimensions.
A significant increase in the vertical airway length was observed after the extraction of the second premolars (p = 0.02). The soft palate length showed a tendency towards an increase that did not reach statistical significance (p = 0.053). No other significant changes in the airway soft tissue measurements were observed. The proclination and protrusion of the upper and lower incisors were significantly decreased compared to pre-treatment measurements.Interpretation & conclusions.Orthodontic treatment involving the extraction of all four second premolars in females with bimaxillary protrusion increases the vertical airway length, which is the amount of distance between base of the tongue and posterior nasal spine. No other significant alterations in the upper airway measurements were observed.
既往研究发现正畸治疗期间拔除第一前磨牙可能会改变上气道尺寸。本研究的目的是调查正畸治疗期间拔除第二前磨牙对成年女性样本上气道尺寸的影响。
本研究纳入了29名年龄在18至30岁之间、存在双颌前突的成年女性患者。她们接受了包括拔除四颗第二前磨牙在内的综合正畸治疗。使用Dolphin影像软件分析头颅定位侧位片治疗前后舌长度和高度、软腭厚度和长度、上、中、下气道间隙以及垂直气道长度的变化。采用描述性统计来描述测量结果。进行配对t检验以比较各维度测量值的治疗前和治疗后均值。
拔除第二前磨牙后，垂直气道长度显著增加（p = 0.02）。软腭长度有增加趋势，但未达到统计学显著性（p = 0.053）。未观察到气道软组织测量的其他显著变化。与治疗前测量值相比，上下切牙的倾斜度和突度显著降低。
对双颌前突女性进行的正畸治疗，拔除四颗第二前磨牙会增加垂直气道长度，即舌根部与后鼻棘之间的距离。未观察到上气道测量的其他显著改变。
