Yildirim Ersin, Karacay Seniz, Erkan Mustafa
a Assistant Professor, Gülhane Military Medical Academy Haydarpasha Education Hospital, Dental Service, Section of Orthodontics, Istanbul, Turkey.
Angle Orthod. 2014 Nov;84(6):1018-25. doi: 10.2319/112713-869.1. Epub 2014 Apr 9.
To evaluate the condylar changes through cone-beam computed tomography (CBCT) images in patients treated with Twin-Block functional appliance.
In this retrospective study, CBCT images of 30 patients who were treated with the Twin-Block appliance were used. Mandible was segmented and pretreatment and posttreatment (T0 and T1) condylar volume was compared. The angle between sella-nasion-Point A (SNA), angle between sella-nasion-Point B (SNB), angle between Point A-nasion-Point B (ANB), midfacial length (Co-A), mandibular length (Co-Gn), and the distances from right condylion to left condylion (CoR-CoL) were also measured on three-dimensional images. Differences were analyzed with Wilcoxon signed rank tests, and Mann-Whitney U-tests were used to compare the scores of male and female participants. Significance was set at P < .05.
In this study, a decrease in SNA and ANB (P < .05 and P < .01, respectively) and an increase in SNB (P < .01) were found. Additionally, CoR-CoL, Co-Gn, and condylar volume increased at both the left and right sides (P < .01). However, increase at Co-A was not statistically significant (P > .05). Comparison of differences by sex was not statistically significant for all measurements (P > .05).
Twin-Block appliance increases condylar volume, mandibular length, and intercondylar distance by stimulating growth of condyle in an upward and backward direction.
通过锥形束计算机断层扫描（CBCT）图像评估使用双阻板功能矫治器治疗的患者髁突的变化。
在这项回顾性研究中，使用了30例接受双阻板矫治器治疗患者的CBCT图像。对下颌骨进行分割，并比较治疗前和治疗后（T0和T1）髁突体积。还在三维图像上测量了蝶鞍-鼻根-点A（SNA）角、蝶鞍-鼻根-点B（SNB）角、点A-鼻根-点B（ANB）角、面中长度（Co-A）、下颌长度（Co-Gn）以及右髁突到左髁突的距离（CoR-CoL）。采用Wilcoxon符号秩检验分析差异，使用Mann-Whitney U检验比较男性和女性参与者得分。显著性设定为P < 0.05。
在本研究中，发现SNA和ANB减小（分别为P < 0.05和P < 0.01），SNB增大（P < 0.01）。此外，CoR-CoL、Co-Gn以及左右两侧髁突体积均增加（P < 0.01）。然而，Co-A的增加无统计学意义（P > 0.05）。所有测量指标按性别比较差异均无统计学意义（P > 0.05）。
双阻板矫治器通过刺激髁突向上向后生长，增加髁突体积、下颌长度和髁突间距离。
