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目的分析双期矫治安氏Ⅱ类1分类错畸形的治疗效果。方法选择安氏Ⅱ类1分类错畸形17例为研究对象,分别进行Ⅰ期Twin-block功能矫治和Ⅱ期固定矫治,并行X线头颅侧位片进行测量,分析治疗前后硬组织的变化。结果经Ⅰ期和Ⅱ期矫治后,患者通过头影测量分析SNB角增大,ANB角减小,前牙覆盖减小。结论对于生长期的以下颌后缩为主的安氏Ⅱ类1分类错,采用双期矫治有明显效果,对于牙型和面型都有明显的改善。
Objective To analyze the treatment effect of Class Ⅱ division 1 malocclusion in double stage treatment. Methods 17 cases of Angle Class Ⅱ Division 1 malocclusion were selected as the study object. The patients were subjected to Ⅰ-term Twin-block functional correction and Ⅱ-stage fixed orthodontic treatment respectively. X-ray cephalograms were used to measure the changes of hard tissue before and after treatment. Results After treatment of stage Ⅰ and Ⅱ, the SNB angle increased, the ANB angle decreased and the coverage of anterior teeth decreased. Conclusions For the Class Ⅱ division 1 malocclusion with the following mandibular retraction in the growth phase, the double-stage correction has a significant effect, which has obvious improvement on the tooth type and the surface type.