Objective To explore the clinical effects of modified Jones device and face bow in molar distalization.Methods 18 patients with mild-to-moderate Angle classⅡmalocclusion caused by crowded front teeth were selected in this study,and they could be treated by tooth extraction or non- extraction correction. The selected patients were randomly divided into two groups,and were treated by molar distalization with modified Jones device and face bow,respectively. X-ray cephalometric and model measurement was performed in patients in two groups before and after treatment.Result Both modified Jones device and face bow had obvious effects in molar distalization, but had statistically significant differences in the molar moving speed, anterior overjet and the inclination of the first molar.Conclusions Both methods can effectively push the maxillary molar to far,but face bow method needs good cooperation of patients and can't continue to work,so the clinical curative effect is not very stable. By modified Jones device can more quickly and effectively promote maxillary molar move far,and does not depend on the patient's coordination,so it is worth clinical popularizing.%目的：探讨改良Jones装置与口外弓2种方法推磨牙向远中的临床疗效．方法选择20例轻中度前牙拥挤的安氏Ⅱ类错病，介于拔牙和不拔牙矫治的边缘，所有病例随机分配在2个组，分别采用改良Jones装置法和口外弓法2种方法推磨牙向远中，在治疗前后进行X线头影测量和模型测量分析．结果2组磨牙远中移动效果均比较明显，但在移动速度、前牙覆盖及第一磨牙的倾斜度的统计分析差异有统计学意义（＜0.05）．结论2种方法都可有效的推上颌磨牙向远中移动，但口外弓法需要患者很好配合且矫治力不能持续发挥作用，导致临床疗效不稳定；而改良Jones装置能更快速、有效地推动上颌磨牙远中移动，且不依赖患者的配合，值得在临床推广．
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