Smith G H, Ashton H
Luxembourg Medical/Dental Center, Langhorne, PA 19047, USA.
Funct Orthod. 1996 Nov-Dec;13(5):16-8, 20.
Past orthodontic research by Schwarze in "Expansion and Relapse in Long Follow-Up Studies" concluded "... that orthodontically induced transverse sizes of the dental arches are very unstable." The article further stated that, "the majority of patients showed a decrease of the transverse molar and canine distance from the end of treatment to the follow-up examination." Also emphasized was the fact that "prolonged retention periods do not prevent relapses." These findings are based on orthodontic techniques that focus on movement of teeth and maxillary expansion without regard for existing cranial base and cranial bone distortions.
施瓦泽在《长期随访研究中的扩弓与复发》中过去的正畸研究得出结论：“……正畸诱导的牙弓横向尺寸非常不稳定。”该文章还指出，“大多数患者从治疗结束到随访检查时，磨牙和尖牙的横向距离减小。”还强调了“延长保持期并不能防止复发”这一事实。这些发现基于专注于牙齿移动和上颌扩弓而不考虑现有颅底和颅骨畸形的正畸技术。
