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目的 评估错牙合畸形经治疗和保持后牙弓的变化情况 ,为临床治疗同类错牙合提供依据。方法 选择拔除4颗第一双尖牙的患者 2 0例 ,采用方丝弓技术治疗。对治疗前后和保持器停戴 1年后的模型进行测量。结果 治疗前后除上下牙弓尖牙宽度增加外 ,其余指标均不同程度减少。去除保持器 1年后 ,上下尖牙宽度和前牙覆牙合 ,覆盖出现复发 ,而上下牙弓中 ,后段宽度和上下牙弓长度继续减少。结论 治疗后上颌尖牙宽度净增加量较下颌稳定 ;经治疗和保持后 ,上下牙弓宽度和长度并非一定会复发。
Objective To evaluate the changes of dental arch after treatment and maintenance of malocclusion, and provide the basis for clinical treatment of the same type of malocclusion. Methods Twenty patients with four first bicuspid canals were selected and treated with square silk arch technique. The model was measured 1 year after treatment and before and after treatment. Results Before and after treatment, except the upper and lower arch teeth canine width increased, the remaining indicators were reduced to varying degrees. After one year of removal of the cage, the width of the upper and lower canine and the anterior teeth overbite, covering the recurrence, while the upper and lower dental arch, the width of the posterior segment and the length of the upper and lower dental arch continued to decrease. Conclusion After treatment, the maxillary canine width increases more than the lower jaw. After treatment and maintenance, the width and length of upper and lower dental arch do not necessarily recur.