四圈扩弓簧的临床应用及改良设计

The Clinical Application and Modification of the Quad Helix Appliance

目的 :介绍四圈扩弓簧矫治器的原理、特点、改良设计及临床应用效果。方法 :结合典型病例介绍四圈扩弓簧的制作、戴入和调节以及改良设计。结果 :通过病例分析发现经 18个月的治疗 ,6宽度可扩大 9 6 5mm ,3宽度扩大 5 2 0mm ,6宽度扩大 3 6 0mm ,3宽度减少 0 45mm。结论 :四圈扩弓簧是一种性能良好 ,值得推广使用的扩弓矫治器。

Objective: The aims of this study are to investigate the working mechanism, the characteristics, the clinical application and the suggested modification of the Quad Helix appliance. Methods: A 7-year-old, female patient with Pierre-Rokin syndrome, who was preformed with palatorrhaphy at 21-month-old treated by using a Quad Helix appliance for one year. Results: After one-year treatment, the wide between the maxillary first molars increased 9 65mm, and the wide between maxillary canines increased 5 20mm. The wide between the mandibular first molars also increased 3 60mm, however the wide between mandibular canines decreased 5 20mm. Conclusion: The Quad-helix appears to be a successful Orthodontic appliance to expand the narrow maxillary or mandibular arches.