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首页> 外文期刊>Angle Orthodontist >Bimaxillary morphometry of patients with class II division 1 malocclusion treated with twin block appliances.
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Bimaxillary morphometry of patients with class II division 1 malocclusion treated with twin block appliances.

机译：双块矫治器治疗II类1分类错牙合患者的双颌形态。

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摘要

To assess changes in bimaxillary morphology in patients with Class II division I malocclusion treated using Twin Block appliances (TBA), pre- and posttreatment lateral cephalographs of 100 patients seven to 16 years of age were compared. The patients were divided into four groups: (1) prepubertal boys (mean treatment time; 13.6+/-4.0 months), (2) adolescent boys (20.1+/-7.7 months), (3) prepubertal girls (12.3+/-1.4 months), and (4) adolescent girls (22.3+/-6.7 months). Five landmarks were digitized on pre- and posttreatment cephalographs for all groups, and the resulting configurations were analyzed using linear analysis, Euclidean Distance Matrix Analysis (WinEDMA), and Thin Plate Spline (TPS) analysis. Results of linear analysis indicated anteroposterior midfacial distances generally increased in all groups. In contrast, WinEDMA indicated that midfacial distances proportionately decreased in all groups treated with TBA. Graphical analysis with TPS showed anteroposterior compression of the configurations, most marked in the region of Prosthion. The affine components of the configurations following the TBA treatment indicated little deformation, but the nonaffine components demonstrated posterior displacement of Prosthion. Thus, improvements in facial balance following TBA treatment are associated with a relative restriction of anterior displacement within the midfacial complex as well as maxillary dento-alveolar effects. Orthodontic treatment methods exerting growth-inhibitory effects within the maxilla may be useful in the correction of Class II division I malocclusions.
机译：为了评估使用Twin Block矫治器（TBA）治疗的II类I类I类错牙合患者的双上颌形态变化，比较了100名7至16岁患者的治疗前和治疗后侧位脑电图。将患者分为四组：（1）青春期前男孩（平均治疗时间; 13​​.6 +/- 4.0个月），（2）青春期男孩（20.1 +/- 7.7个月），（3）青春期前女孩（12.3 +/-） 1.4个月）和（4）青春期女孩（22.3 +/- 6.7个月）。在所有组的治疗前和治疗后脑电图仪上将五个界标数字化，并使用线性分析，欧氏距离矩阵分析（WinEDMA）和薄板样条线（TPS）分析来分析所得配置。线性分析的结果表明，所有组中前后面部的距离通常都会增加。相比之下，WinEDMA表明，在用TBA治疗的所有组中，中距距离均成比例下降。使用TPS进行的图形分析显示，配置的前后压缩，在Prosthion区域最为明显。 TBA处理后构型的仿射分量显示出很小的变形，但非仿射分量显示了假体的后移。因此，TBA治疗后面部平衡的改善与面部复合体内部前移的相对限制以及上颌牙槽牙槽效应有关。在上颌骨内发挥生长抑制作用的正畸治疗方法可能对矫正II类I类错牙合有用。

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