The use of the C-expander is an effective treatment modality for maxillary skeletal deficiencies which can cause ailments and significantly reduce life expectancy in late adolescents and young adults. However, the morphological and dynamic effects on the nasal airway have not been reported. The main goal of this study was to evaluate the nasal airway changes after the implementation of a C-expander. A sample of nine patients (8 females, 1 male, age range from 15 to 29 years) was included. The morphology parameters and nasal airway ventilation parameters of pretreatment and posttreatment were measured. All study data were normally distributed. A paired -test was used to evaluate the changes before and after treatment. After expansion, the mean and standard deviation values of intercanine maxillary width (CMW) and intermolar maxillary width (MMW) increased from  mm and  mm to  mm () and  mm (), respectively. The nasal cavity volume increased from  mm³ to  mm³ (). The nasal pressure drop decreased from  Pa to  Pa (), while the value of the maximum velocity decreased from  m/s to  m/s (). Nasal resistance dropped remarkably from  Pa/ml/s to  Pa/ml/s (). The use of C-expander can effectively broaden the area and volume of the nasal airway, having a positive effect in the reduction of nasal resistance and improvement of nasal airway ventilation. For patients suffering from maxillary width deficiency and respiratory disorders, a C-expander may be an alternative method to treat the disease.

中文翻译：

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C-膨胀机治疗后鼻气道变化的计算流体动力学分析

C扩展器的使用是一种有效的治疗方式，可用于治疗上颌骨骨骼不足，从而导致疾病，并显着降低青少年晚期和年轻人的预期寿命。然而，尚未有关于鼻气道的形态学和动力学影响的报道。这项研究的主要目的是评估实施C型膨胀机后鼻道的变化。样本包括九名患者（8名女性，1名男性，年龄在15至29岁之间）。测量了治疗前后的形态学参数和鼻气道通气参数。所有研究数据均呈正态分布。一对-测试用于评估治疗前后的变化。扩张后，犬的上颌间宽度（CMW）和磨牙间上颌宽度（MMW）的平均值和标准偏差值从 毫米和  毫米至  毫米 （）和 毫米 （）。鼻腔容积从 毫米³至 毫米³（）。鼻压降从 帕至  帕（），而最大速度的值从 米/秒至  多发性硬化症 （）。鼻阻力从 Pa / ml /秒至  帕/毫升/秒（）。使用C型膨胀机可有效拓宽鼻道的面积和体积，对减少鼻阻力和改善鼻道通气有积极作用。对于上颌骨宽度不足和呼吸系统疾病的患者，C扩展器可能是治疗该疾病的另一种方法。