论文部分内容阅读
本研究以１５名恒牙期安氏Ⅱ类病人作为研究对象，下牙弓均拔除第二双尖牙，拔牙时的平均年龄为１３．４岁。拔牙后上颌即开始方丝弓矫正器治疗，下牙弓牙齿自行调整，平均观察６．６个月。通过拔牙前后的牙 模型测量及计算机Ｘ线头影测量对比分析发现，下牙弓拔牙间隙明显减小，下前牙直立，下颌磨牙前移，下牙弓拥挤度减小。本研究结果表明：下牙弓自行调整期间牙齿的移动情况对于第二双尖牙拔除的安氏Ⅱ类病人的治疗有益。
In this study, 15 permanent Class Ⅱ patients were studied. The second maxillary teeth were extracted from the lower dental arch. The mean age at extraction was 13.4 years old. After extraction of the maxillary arch began to square wire orthodontic treatment, the lower arch teeth to adjust themselves, an average of 6.6 months. By comparing the dental model measurement before and after tooth extraction and the computerized X-ray cephalometry, it was found that the space between the lower dental arch extraction teeth decreased significantly, the anterior teeth lower, the mandibular molars moved forward, and the crowding degree of the lower dental arch decreased. The results of this study show that the movement of the teeth during self-adjustment of the lower dental arch is beneficial for the treatment of Class II patients with the second bicuspid extraction.