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目的:观察Twin-block矫治器对安氏Ⅱ~1类错的矫治效果以及患者侧貌软组织的改变。方法:选择15例生长发育期以下颌后缩为主的安氏Ⅱ~1类错患者,其中男性9例,女性6例,平均年龄11.2岁,采用Twin-block矫治器进行治疗,矫治前后分别拍摄X线投影颅侧位片进行测量,对治疗前后测量的结果进行配对t检验。结果:矫治后前牙覆覆盖关系基本正常,SNB角增大,ANB角减少,软组织面角增大,颏唇沟深度-H线距离减少,软组织侧貌改善明显。结论:对于生长发育期的以下颌后缩为主的安氏Ⅱ~1类错,采用Twin-block矫治器有明显效果,有助于改善患者的牙矢状关系。
OBJECTIVE: To observe the effect of Twin-block appliance on the correction of Class Ⅱ-Ⅰ malocclusion and the change of soft tissue in the patient’s side. Methods: Fifteen patients with severe mandibular retrusion type Ⅱ ~ 1 malocclusion were enrolled in this study. Among them, 9 were males and 6 females, with a mean age of 11.2 years. The patients were treated with Twin-block appliance before and after treatment Were taken X-ray projection of the cranial radiographs were measured before and after treatment measured the results of paired t test. Results: After correction, the coverage of the anterior lamina was basically normal. The SNB angle was increased, the ANB angle was decreased, the facial angle of the soft tissue was increased, the depth of the hi - notch groove was decreased, and the soft tissue appearance was improved obviously. CONCLUSIONS: Twin-block appliances are effective in improving the sagital sagital 牙 sagittal relationship in patients with growth-distracting Class Ⅱ ~ Class 1 malocclusion.