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总结临床使用直丝弓技术矫治安氏Ⅱ’错拔牙病例的疗效 ,操作要领和注意事项。方法 对 2 5例年轻恒牙安氏Ⅱ’错采用拔除 4 44 4进行直丝技术矫治。结果 2 5例患者平均年龄 1 3 .4岁 ,平均矫治时间 2 4 .5个月 ,矫治完成后均达到理想的侧面外形 ,磨牙关系由Ⅱ类改为Ⅰ类关系。前牙覆覆盖正常 ,尖窝关系良好 ,尖牙成Ⅰ类关系。矫治前后头影测量显示ANB角由平均 5 .5°± 2 .1°改正为 3 .1°± 1 .3°,代表面部软组织侧面外形的Z角由 60 .5°± 5 .6°改变为 77°± 5 .8° ,代表上下颌矢状关系的AO -BO距离由 (6 .5± 2 .3)mm改为 (3 .1± 1 .1 )mm。结论 直丝弓技术矫治Ⅱ’错 ,临床效果良好 ,椅旁操作时间短 ,值得推广使用
To summarize the clinical effect of using straight wire arch to treat Angle 's Ⅱ' wrong tooth extraction, the operation essentials and precautions. Methods 25 cases of young permanent teeth Angle Ⅱ 'wrong removal 4 444 straight wire technique. Results The average age of 25 patients was 13.4 years old and the mean correction time was 24.5 months. After the treatment, the ideal lateral appearance was achieved. The relationship between molars was changed from class Ⅱ to class Ⅰ. Cover the anterior lamina propria normal, a good relationship between the spire, canine into a class relationship. Cephalometric measurements before and after treatment showed that the ANB angle was corrected from an average of 5.5 ± 2.1 ° to 3.1 ° ± 1.3 °, representing a change of Z angle of 60.5 ° ± 5.6 ° from the facial soft tissue profile Was 77 ° ± 5. 8 °. The AO -BO distance representing the maxillary and mandibular sagittal relationship was changed from (6.5 ± 2.3) mm to (3.11 ± 1.1) mm. Conclusions Straight-line arch technique is the best way to treat Ⅱ 'malocclusion with good clinical effect and short chair operation time. It is worth to popularize