通过总结６２例拥挤错　患者采用细丝弓扩弓的固定矫治方法，发现牙弓的长度、宽度和牙轴倾斜度均不同程度地增长，结果为拥挤的牙齿提供了间隙，临床疗效稳定，其总有效率为９６．７％，提示对拥挤错　进行间隙分析后才确定是否拔牙或扩弓的方法是行之有效的。文章还对细丝弓技术的特点、扩弓的方法、效果和限度进行了讨论。 By summarizing the 62 cases of crowded patients with thin-wire bow fixation, it was found that the length, width and inclination of the dental arch were all increased to varying degrees. As a result, the crowded teeth provided a gap and the clinical curative effect was stable. The total effective rate is 96.7%, suggesting that the method of determining whether to extract teeth or expand the bow after performing gap analysis on crowded errors is effective. The article also discusses the characteristics of the filament arch technique, the method of expanding the bow, the effect and the limit.