Factors affecting changes in soft tissue profile after various treatment modalities for skeletal Class II malocclusion: A cross-sectional study
Factors affecting changes in soft tissue profile after various treatment modalities for skeletal Class II malocclusion: A cross-sectional study
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DOI：
10.1016/j.ortho.2019.06.009
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发表时间：
2019-09-01
影响因子：
1.5
通讯作者：
Sukhia, Rashna Hoshang
中科院分区：
文献类型：
--
作者：
Khan, Abdul Rahman;Fida, Mubassar;Sukhia, Rashna Hoshang
简介 > 骨性 II 类错牙合畸形的治疗方法多种多样，对软组织的影响也不同。本研究旨在确定骨性 II 类错牙合不同治疗方式后影响软组织轮廓变化的因素。材料和方法 > 使用 141 名受试者治疗前和治疗后的侧位头颅照片进行横断面研究。样本包括 47 名接受 Clark's Twin Block 治疗的患者、47 名接受第一前磨牙拔除治疗的患者以及 47 名接受 II 类弹性材料治疗的患者。使用稳定的标志：鞍前壁和前颅底，将治疗后的头颅照片叠加在治疗前的放射照片上。使用 X-Y 坐标系通过配对 t 检验评估轮廓的变化。通过使用多变量线性回归分析来预测轮廓的变化。显着性水平保持在P。除了鼻下和上唇在水平方向上外，鼻子、上唇、下唇和下巴在水平和垂直方向上的所有标志的软组织轮廓变化均具有统计学显着性（P < 0.001）。除鼻前、鼻下、下唇沟外，所有具有不同预测能力的标志点在垂直方向上都可以预测软组织轮廓的变化。结论 > 几乎所有鼻子和面部下三分之一的软组织标志点都表现出向下和向前的运动。研究发现，上唇在水平和垂直方向上的变化比下唇发生的变化更容易预测。
Introduction > Various treatment modalities are used to treat skeletal Class II malocclusion with different effects on the soft tissue. This study was aimed to determine factors affecting changes in soft tissue profile after various treatment modalities for skeletal Class II malocclusion.Materials and methods > A cross-sectional study was conducted using pre-treatment and post-treatment lateral cephalograms of 141 subjects. The sample consisted of 47 patients treated with Clark's Twin Block, 47 with first premolar extractions, and 47 with Class II elastics. The post-treatment cephalograms were superimposed on pre-treatment radiographs using stable landmarks: anterior wall of sella turcica and anterior cranial base. The changes in profile were evaluated by paired t-test using X-Y co-ordinate system. Changes in profile were predicted by using multi-variable linear regression analysis. Level of significance was kept at P The changes in soft tissue profile were statistically significant for all the landmarks (P < 0.001) of nose, upper and lower lip, and chin in horizontal and vertical direction, except subnasale and labrale superius in the horizontal direction. The soft tissue profile changes can be predicted for all landmarks with various prediction powers except pronasale, subnasale, and inferior labial sulcus in the vertical direction.Conclusions > Almost all the soft tissue landmarks of nose and lower third of the face exhibit downward and forward movement. The changes in the upper lip in both horizontal and vertical directions were found to be more predictable than those occurring in the lower lip.