University of Health Sciences, Faculty of Dentistry, Department of Orthodontics, Istanbul, Turkey.
Scanning. 2021 Apr 24;2021:9928101. doi: 10.1155/2021/9928101. eCollection 2021.
This study was aimed at proposing a three-dimensional (3D) evaluation method for the soft tissue effects of Twin Block (TB) functional appliance therapy by using cone beam computed tomography (CBCT) images. In this retrospective study, a total of 60 pre- and posttreatment (T0 and T1) CBCT images of Class II patients with mandibular retrognathia treated with a TB appliance were used. Volumetric and linear soft tissue changes were evaluated quantitatively with 3D measurements and qualitatively with color mapping visual. Linear (NV-A and NV-Pog) and angular (SNA, SNB, and ANB) skeletal changes were also measured on 3D images. The Wilcoxon signed-rank test was used to compare statistical differences, and the scores of male and female participant differences were observed with the Mann-Whitney test. In this study, a decrease was observed in SNA ( < 0.05), ANB ( < 0.01), and NV-Pog ( < 0.05) while an increase in SNB ( < 0.01) was found. However, decrease in NV-A distance was not statistically significant ( > 0.05). As a result of the evaluation of soft tissue changes, while the anterior reposition of the lower lip, soft tissue pogonion, and soft tissue gnathion was found to be significant ( < 0.01, < 0.01, and < 0.05, respectively), the upper lip and subnasale repositions were not statistically significant ( > 0.05). 3D soft tissue changes after TB therapy can be evaluated quantitatively and qualitatively by using CBCT images. Anterior repositioning of the mandible with functional therapy also provides improvement in soft tissue profile, especially in the lower facial region.
本研究旨在提出一种使用锥形束计算机断层扫描（CBCT）图像评估 Twin Block（TB）功能矫治器软组织效果的三维（3D）评估方法。在这项回顾性研究中，共使用了 60 例下颌后缩的 II 类错畸形患者在 TB 矫治器治疗前后（T0 和 T1）的 CBCT 图像。通过 3D 测量进行定量评估和颜色映射视觉进行定性评估，评估了体积和线性软组织变化。还在 3D 图像上测量了线性（NV-A 和 NV-Pog）和角度（SNA、SNB 和 ANB）骨骼变化。使用 Wilcoxon 符号秩检验比较统计学差异，观察男性和女性参与者差异的评分采用 Mann-Whitney U 检验。在本研究中，SNA（<0.05）、ANB（<0.01）和 NV-Pog（<0.05）减少，而 SNB（<0.01）增加。然而，NV-A 距离的减少没有统计学意义（>0.05）。在软组织变化的评估中，发现下唇、软组织颏点和软组织下颌后缩的前位是显著的（<0.01、<0.01 和 <0.05，分别），而上唇和鼻底的复位没有统计学意义（>0.05）。使用 CBCT 图像可以定量和定性地评估 TB 治疗后的软组织变化。功能性治疗下颌前移位也可改善软组织轮廓，特别是在下颌区域。
