Department of Orthodontics, Faculty of Dentistry, Baskent University, 1. Cad No: 107 Bahcelievler, Ankara, Turkey.
Clin Oral Investig. 2021 Aug;25(8):4841-4850. doi: 10.1007/s00784-021-03789-9. Epub 2021 Jan 15.
To evaluate the effects of miniplate anchored Forsus Fatigue Resistant Device (MAF) and activator treatments in the pharyngeal airway dimensions and hyoid bone position.
Thirty-eight patients with mandibular retrusion who were treated with either MAF or activator were selected retrospectively and compared with an untreated control group. The data of 114 lateral cephalograms, comprising those taken before treatment (T1) and at the end of functional treatment (T2), were evaluated with regard to their linear, angular, and area measurements.
The mandibular length increased and the hyoid bone moved forward with both treatments (P < 0.05). The horizontal change in the hyoid bone position with MAF treatment was correlated with changes in the point B and ANB angle. Increases of 1.8 mm, 1.4 mm, and 1.8 mm in the pharyngeal airway dimensions were obtained at the levels of the second, third, and fourth cervical vertebra, respectively, with the MAF treatment. On the other hand, an increase of 1.9 mm was found at the level of the fourth cervical vertebra with the activator treatment. The greatest vertical movement in the Menton and the highest increase in the oropharyngeal area were observed in the MAF group (P < 0.05).
Both the MAF and activator treatments caused favorable maxillomandibular changes; however, the MAF treatment provided a greater increase in the oropharyngeal area according to both the increase in mandibular length and the change in the vertical position of the mandible.
Functional appliances were found to be useful in increasing the pharyngeal airway dimensions in the short-term. The skeletal anchored fixed functional appliance caused a greater increase in the oropharyngeal airway area that may be beneficial for Class II patients who carry a risk of having respiratory problems.
评估微型板锚定 Forsus 疲劳抵抗装置（MAF）和激活器治疗对上咽气道尺寸和舌骨位置的影响。
回顾性选择了 38 例下颌后缩患者，分别接受 MAF 或激活器治疗，并与未治疗的对照组进行比较。评估了 114 张侧位头颅侧位片的数据，包括治疗前（T1）和功能治疗结束时（T2）的线性、角度和面积测量值。
两种治疗方法均使下颌长度增加，舌骨向前移动（P < 0.05）。MAF 治疗时舌骨位置的水平变化与点 B 和 ANB 角的变化相关。MAF 治疗可使咽气道尺寸在第二、第三和第四颈椎水平分别增加 1.8、1.4 和 1.8 毫米。另一方面，激活器治疗可使第四颈椎水平增加 1.9 毫米。MAF 组的 Menton 有最大的垂直运动，口咽区有最高的增加（P < 0.05）。
MAF 和激活器治疗均可引起良好的上下颌骨变化；然而，MAF 治疗通过增加下颌长度和下颌垂直位置的变化提供了更大的口咽区增加。
功能性矫治器被发现可在短期内增加咽气道尺寸。骨骼锚定固定功能性矫治器可使口咽气道面积显著增加，这可能对存在呼吸问题风险的 II 类患者有益。
