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首页> 外文期刊>Dental and Medical Problems >Evaluation of the change in the tongue posture and in the hyoid bone position after Twin Block appliance therapy in skeletal class II subjects
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Evaluation of the change in the tongue posture and in the hyoid bone position after Twin Block appliance therapy in skeletal class II subjects

机译：Twin Block矫治器治疗骨骼II类受试者后舌头姿势和舌骨位置的变化评估

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Background . The tongue is posteriorly postured in a retrognathic mandible, and Twin Block appliance (TBA) therapy places the tongue and the hyoid bone in a favorable position to eliminate the risk of causing respiratory obstruction. Objectives . The aim of this study was to evaluate the change in the tongue posture and in the hyoid bone position after TBA therapy. Material and Methods . This cross-sectional study was conducted using the pre-functional (PF1), postfunctional (PF2) and post-treatment (PT) cephalograms of 30 growing subjects. The tongue posture at 6 distances and the hyoid bone position with 4 parameters were digitally measured using the Rogan-Delft View Pro-X? software. A digital vernier caliper was used to determine the inter-canine and inter-molar widths on the dental casts. The Wilcoxon signed-rank test was used to compare the PF1 and PF2 values, and the PF1 and PT values. Results . The comparison of the PF1 and PF2 values showed significant differences in the tongue posture at distances 1–5. In the case of the hyoid bone, only the linear distance from the sella (S) to the most anterior point on the hyoid bone (H) – the SH distance – revealed a significant difference (p 0.01). The change in the tongue posture and in the hyoid bone position achieved at the PF2 stage remained stable at the PT stage. Significant differences occurred in the PF1 and PF2 maxillary and mandibular inter-canine and inter-molar widths (p = 0.01 and p = 0.04, and p 0.01 and p = 0.02), respectively. Conclusion . Twin Block appliance therapy resulted in the advancement of the mandible with a lowered posturing of the tongue. The hyoid bone was displaced inferiorly after TBA therapy, whereas the angular position of the hyoid bone remained unchanged.
机译：背景 。将舌头向后放在下颌后颌骨中，Twin Block矫治器（TBA）治疗将舌头和舌骨置于合适的位置，以消除引起呼吸阻塞的风险。目标。这项研究的目的是评估TBA治疗后舌头姿势和舌骨位置的变化。材料与方法 。这项横断面研究是使用30名成长中受试者的功能前（PF1），功能后（PF2）和治疗后（PT）头颅图进行的。使用Rogan-Delft View Pro-X？以数字方式测量6个距离处的舌头姿势和4个参数的舌骨位置。软件。使用数字游标卡尺确定牙模上的犬齿间和臼齿间的宽度。使用Wilcoxon符号秩检验比较PF1和PF2值以及PF1和PT值。结果。 PF1和PF2值的比较显示，在距离1-5处，舌头姿势存在显着差异。对于舌骨，只有从蝶鞍（S）到舌骨最前点（H）的线性距离– SH距离–显示出显着差异（p <0.01）。在PF2阶段，舌头姿势和舌骨位置的变化在PT阶段保持稳定。 PF1和PF2上颌和下颌的犬齿间和臼齿间的宽度（p = 0.01和p = 0.04，p <0.01和p = 0.02）分别存在显着差异。结论。 Twin Block矫治器疗法可改善下颌骨，并降低舌头的姿势。舌骨在TBA治疗后下方移位，而舌骨的角位置保持不变。

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