Dalci Oyku, Altug Ayse Tuba, Memikoglu Ufuk Toygar
Aust Orthod J. 2014 May;30(1):45-53.
The present study aimed to compare the treatment outcomes of a fixed-functional appliance (Twin-Force Bite Corrector - TFBC) and a conventional removable functional appliance (Activator) in the treatment of skeletal Class II malocclusions.
The TFBC and Activator Groups each included 10 young adults possessing a skeletal Class II malocclusion, and the treatment outcomes of both groups were quantified and compared, using lateral cephalometric radiographs, with an untreated skeletal Class II Control Group.
A skeletal Class I relationship and a marked reduction in overjet were achieved in both treatment groups; however, the duration of treatment was significantly shorter in the TFBC Group (0.45 years) when compared with the Activator Group (1.37 years) (p < 0.001). Effective length and sagittal positioning of the mandible underwent significant changes in the TFBC and Activator Groups. Vertical facial dimensions increased in each group; however, these increases were significantly greater in the Activator Group when compared to the TFBC and Control Groups (p < 0.05). Dentoalveolar changes also contributed to the reduction in overjet.
Although both appliances succeeded in eliminating the Class II relationship and improving the overjet and overbite, the short treatment time in the TFBC Group raises questions regarding the long-term stability of the results.
本研究旨在比较固定功能矫治器（双力咬合矫治器 - TFBC）和传统可摘功能矫治器（肌激动器）治疗骨性II类错牙合畸形的治疗效果。
TFBC组和肌激动器组各纳入10名患有骨性II类错牙合畸形的年轻成年人，使用头颅侧位片对两组的治疗效果进行量化并与未经治疗的骨性II类对照组进行比较。
两个治疗组均实现了I类骨性关系且覆盖明显减小；然而，与肌激动器组（1.37年）相比，TFBC组的治疗时间显著更短（0.45年）（p < 0.001）。TFBC组和肌激动器组下颌骨的有效长度和矢状位发生了显著变化。每组的垂直面部尺寸均增加；然而，与TFBC组和对照组相比，肌激动器组的增加幅度显著更大（p < 0.05）。牙牙槽骨变化也有助于覆盖减小。
尽管两种矫治器均成功消除了II类关系并改善了覆盖和覆牙合，但TFBC组较短的治疗时间引发了对结果长期稳定性的质疑。
