Behroozian Ahmad, Pourahmad Anahita, Zali Mahsa, Zandesh Amir
Department of Orthodontics, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
Dental Student, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran.
J Dent Res Dent Clin Dent Prospects. 2025 Mar 31;19(1):57-60. doi: 10.34172/joddd.025.41445. eCollection 2025 Mar.
Growth modification is a strategy for the treatment of skeletal Cl II patients. Clear twin block (CTB) is a modification of traditional twin block (TTB), which is made from thermoplastic sheets instead of acrylic resin and wire. This study compared the dental effects of the clear and TTBs.
In this randomized clinical trial, 60 growing skeletal Cl II patients with dental Cl II div 1 malocclusion were selected and randomly divided into two groups: TTB and CTB. Cephalometric radiography and stone models were taken before treatment (T) and six months (T) after appliance insertion. Data were analyzed using independent t-test and paired t-test at the 0.05 significance level.
There was a significant difference between CTB and TTB in IMPA at T (<0.05). Intragroup comparisons showed no significant change from T to T in the CTB group and for U1-SN and U1-Pal amounts in the TTB group. T1-T2 comparison showed a significant change in IMPA in the TTB group (<0.05).
TTB showed more protrusion of lower incisors compared to CTB.
生长改良是治疗骨骼Ⅱ类患者的一种策略。透明双阻板（CTB）是传统双阻板（TTB）的一种改良，它由热塑性板材制成，而非丙烯酸树脂和金属丝。本研究比较了透明双阻板和传统双阻板的牙齿矫治效果。
在这项随机临床试验中，选取60例生长发育期的骨骼Ⅱ类且伴有牙性Ⅱ类1分类错牙合的患者，并随机分为两组：传统双阻板组和透明双阻板组。在治疗前（T0）以及戴入矫治器6个月后（T1）拍摄头颅侧位片和制作石膏模型。数据采用独立样本t检验和配对t检验进行分析，显著性水平为0.05。
在T0时，透明双阻板组和传统双阻板组的下切牙倾斜度（IMPA）存在显著差异（P<0.05）。组内比较显示，透明双阻板组从T0到T1无显著变化，传统双阻板组的上切牙-鼻根点连线（U1-SN）和上切牙-腭平面夹角（U1-Pal）也无显著变化。T0-T1比较显示，传统双阻板组的下切牙倾斜度有显著变化（P<0.05）。
与透明双阻板相比，传统双阻板使下切牙更前突。
