目的:II类骨骼错牙合畸形是最常见的错牙合畸形之一。在骨骼II类错牙合的功能性矫治器中,带有上颌扩张器的Twin-Block矫治器可有效地重新定位下颌骨。在这项研究中,在评估三维CBCT数据和二维侧颅图数据的一致性后,我们通过追踪和测量侧颅图,重点研究了带上颌扩张器的Twin-Block矫治器对生长中的II类骨骼错牙合畸形儿童上呼吸道的影响.
方法:选择102例9~15岁(11.37±2.80,男女比例=1:1)的骨性II类错牙合畸形患者,评价CBCT数据与头颅侧位图数据的一致性。然后选择强相关和中等相关的节段,以研究带上颌扩张器的Twin-Block对66名生长中的II类骨骼性错牙合(11.31±1.23岁,男性/女性比例=1:1)通过侧位脑电图。
结果:结果显示鼻咽部具有很强的显着相关性(r=0.708),而整个上呼吸道中具有中等的显着相关性(r=0.641),腭咽(r=0.553),和舌咽(r=0.575),但下咽(r=0.323)的相关性较弱。相应的测定系数(R2)也通过散点图分析测定。此外,与预处理数据(T1)相比,上呼吸道的总面积和鼻咽的面积,腭咽,功能性治疗后(T2)和舌咽增加,具有统计学意义。
结论:侧位头颅图可以在一定程度上反映骨骼Ⅱ类儿童的鼻咽和口咽的体积,而带有上颌扩张器的Twin-Block矫治器可以显着扩大鼻咽和口咽的体积。
结论:头颅侧位图用于分析鼻咽部,腭咽,和舌咽在正畸临床实践中的应用。带有上颌扩张器的Twin-Block矫治器对患有气道狭窄的II类骨骼患者具有积极作用。
OBJECTIVE: Skeletal class II malocclusion is one of the most common malocclusions. Among the functional appliances for skeletal class II malocclusion, the Twin-Block appliance with a maxillary expander is effective in repositioning the mandible forward. In this study, we focused our efforts on investigating the effects of Twin-Block appliances with maxillary expanders on the upper airway in growing children with skeletal class II malocclusion by tracing and measuring lateral cephalograms after evaluating the consistency of three-dimensional CBCT data and two-dimensional lateral cephalogram data.
METHODS: A total of 102 patients ranging from 9 to 15 years old (11.37 ± 2.80, male/female ratio = 1:1) with skeletal class II malocclusion were selected to evaluate the consistency of CBCT data and lateral cephalogram data. The strongly and moderately correlated segments were then selected to study the effects of Twin-Block with a maxillary expander on the upper airway in 66 growing children with skeletal class II malocclusion (11.31 ± 1.23 years old, male/female ratio = 1:1) by lateral cephalograms.
RESULTS: The results showed a strong significant correlation in the nasopharynx (r = 0.708) and moderate significant correlations in the overall upper airway (r = 0.641), palatopharynx (r = 0.553), and glossopharynx (r = 0.575) but a weak correlation in the hypopharynx (r = 0.323). The corresponding determination coefficient (R2) was also determined by scatter plot analysis. Moreover, compared with the pretreatment data (T1), the total area of the upper airway and the areas of the nasopharynx, palatopharynx, and glossopharynx after functional treatment (T2) increased statistically and significantly.
CONCLUSIONS: Lateral cephalograms can reflect the volume of the nasopharynx and oropharynx in skeletal class II children to a certain extent, while Twin-Block appliances with maxillary expanders can widen the volume of the nasopharynx and oropharynx significantly.
CONCLUSIONS: The lateral cephalogram is reliable for analyzing the nasopharynx, palatopharynx, and glossopharynx in orthodontic clinical practice. Twin-Block appliances with maxillary expanders have a positive effect on skeletal class II patients with airway stenosis.