上颌单颌拔牙矫治安氏Ⅱ类1分类错[牙合]

Treatment of class Ⅱ division 1 malocclusions with single maxillary extraction orthodontics

目的 探讨上颌单颌拔牙矫治安氏II类 1分类错的疗效、适应证和临床意义。方法 对 14例安氏II类 1分类错患者采用上颌单颌拔牙模式进行矫治 ,将矫治前后的X线头影测量数据进行对比。结果 ① 1-FH角减少 11.0 3° ,1-MP角增加 3.0 7° ;②下颌综合长度增加 3.30mm ;③上、下唇突度分别减小 2 .6 5mm和 1.6 4mm。上述测量项目矫治前、后的均值之间 ,差异具有显著性 (P <0 .0 5～ 0 .0 0 1)。结论 上颌单颌拔牙模式适用于下切牙唇倾度和下唇突度较小的牙源性安氏II类

Objective To investigate the effects, indications and clinical significance of single maxillary extraction orthodontics used for class Ⅱ division 1 malocclusions. Methods 14 class Ⅱ division 1 patients were treated by single maxillary extraction orthodontics, the cephalometric data before and after treatment were analysed by statistical methods. Results After treatment ,①the angle 1 FH had decreased by 11.03degrees and the angle 1 MP had increased by 3.07degrees; ②the mandibular length had increased by 3.30 mm;③the upper and lower lip were retruded by 2.65 mm and 1.64 mm respectively. Statistical significance ( P <0.001～0.05) was found between the means before and after treatment. Conclusions Single maxillary extraction orthodontics is suitable for class Ⅱ division 1 patients with less labial tipping of lower incisors and less lower lip protrusion.