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The orthopedic treatment of skeletal class Ⅲ malocclusion with maxillary protraction therapy
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF STOMATOLOGY
- Issue:
- 6
- DOI:
- 10.3760/j.issn:1002-0098.2001.06.001
- Key Word:
- 错(牙合);发育,颌骨;矫治器
Abstract： 目的评价早期前方牵引矫治骨性前牙反(牙合)引起的牙颌面形态学变化及其对前牙反(牙合)儿童牙颌面生长发育的影响.方法挑选40名年龄8～11岁的骨性前牙反(牙合)儿童,随机分为2组,一组进行前方牵引矫治器治疗,另一组作对照观察.2组儿童在治疗或观察期前后分别拍摄头颅侧位定位X线片,行X线片头影测量,以计算机进行统计分析.结果治疗组儿童的A点平均前移3.5 mm(对照组为-1.75 mm),代表下颌突度的SNB、SNPg角明显减小,代表上下颌间关系的测量项目ANB角、NA-PA角明显增大.结论在替牙中晚期应用前方牵引矫治器治疗,可刺激上颌骨前移、控制下颌骨的旋转及生长速度,使反(牙合)患者的Ⅲ类面型得到明显改善.
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