Twin-block矫治器矫治Ⅱ类一分类骨性错的临床应用

Clinical evaluation of Twin-block functional appliances on skeletal class Ⅱ division 1 malocclusion

目的：观察Twin-block矫治器对生长期Ⅱ类一分类骨性错的牙、、颌面的影响,探讨其矫治机制。方法：临床选择15例早期的安氏Ⅱ类骨性错采用Twin-block矫治器矫治的患者,对其治疗前后的X头影测量分析比较。结果：15例患者经过6~8个月的治疗后,Twin-block矫治器可显著促进下颌骨的生长发育,ANB角、U1-NB角、U1-NA距、wits值、覆合覆盖减小（P〈0.05）;SNB角、U1-L1角、Po-NB距显著增加（P〈0.05）,上下颌骨间关系协调。磨牙关系为I类或偏Ⅲ类关系。结论：Twin-block矫治器适用于生长期Ⅱ类一分类骨性错的早期矫治,可快速、有效地改善患者的侧面形。

Objective To investigate the clinical effect of Twin-block functional appliances in the treatment of skeletal class Ⅱ division 1 malocclusion.Method Fifteen growth patients with skeletal class Ⅱ division 1 malocclusion were treated with Twin-block functional appliances.Pre-and post-treatment cephalograms were compared.Results After a treatment period of 6~8 months,the growth of the mandible was stimulated.ANB,OJ decreased significantly,while SNB increased significantly.The sagittal disharmony of Angle＇s class Ⅱ malocclusion was corrected.ClassⅠ or slight class Ⅲ molar relationship was obtained.Conclusion Twin-block functional appliances is fit for the early orthodontic treatment of skeletal class Ⅱ division 1 malocclusion,is effective to improve the profile of the patients with skeletal class Ⅱ division 1 malocclusion.