Erdinç A E, Ugur T, Erbay E
Department of Orthodontics, Faculty of Dentistry, Istanbul University, Izmir, Turkey.
Am J Orthod Dentofacial Orthop. 1999 Sep;116(3):287-300. doi: 10.1016/s0889-5406(99)70240-4.
In this retrospective investigation, the changes occurring during the treatment of patients with posterior crossbite in the mixed dentition with the use of expansion plate and quad-helix appliances were evaluated and compared with those resulting from growth and development occurring in a control group of patients of similar age and type of malocclusion. The expansion plate group consisted of 13 patients, the quad-helix group of 14 patients, and the control group consisted of 10 children with transverse posterior crossbites in the mixed dentition. The research material was formed from orthodontic models and lateral and frontal cephalometric radiographs from 37 children. It was observed in this investigation that transverse expansion is achieved by both the expansion plate and quad-helix appliances. However, the average period of treatment was 1.2 years for the expansion plate, and 0.6 years for the quad-helix appliance. Although posterior crossbite was corrected in a fairly short period of time, the quad helix appliance caused considerable buccal tipping of the maxillary first permanent molars.
在这项回顾性研究中，评估了混合牙列期使用扩弓板和四螺旋矫治器治疗后牙反合患者期间发生的变化，并与年龄和错牙合类型相似的对照组患者生长发育所产生的变化进行了比较。扩弓板组有13例患者，四螺旋矫治器组有14例患者，对照组由10例混合牙列期后牙横向反合的儿童组成。研究材料来自37名儿童的正畸模型以及头颅侧位片和正位片。在本研究中观察到，扩弓板和四螺旋矫治器均可实现横向扩展。然而，扩弓板的平均治疗时间为1.2年，四螺旋矫治器为0.6年。尽管后牙反合在相当短的时间内得到了矫正，但四螺旋矫治器导致上颌第一恒磨牙出现了明显的颊向倾斜。
