摘要
目的探讨自行研制的一种下颌前方牵引器在矫正以下颌后缩为主要病因的安氏Ⅱ类Ⅰ分类错牙合的效果。方法选择30例以下颌后缩为主要病因的安氏Ⅱ类Ⅰ分类患者,采用方丝弓矫正器治疗的同时,配合使用下颌前方牵引器。牵引前后分别拍摄头颅侧位X线定位片进行头影测量,测量结果进行统计学处理。结果30例患者矫正后上下前牙排列整齐,覆盖覆牙合正常,磨牙关系正常;X线头影测量显示:SNB角、ANB角、下颌长度、下颌切牙切缘和下颌第1磨牙牙冠近中点到SP线的距离,均有明显变化。结论下颌前方牵引器是一种矫形力矫治器,可促进下颌向前发育;同时,抑制上颌骨的生长发育,适用于矫治下颌后缩。
Objective To design a mandibular protraction appliance and to observe its effect in the treatment of mandibular retrognathia with malocclusion of Angle class II and division I. Methods 30 cases of mandibular retrognathia with Angle class II and division I malocclusion were treated with the mandibular protraction and edgewise appliance. Cephalometric radiograph and measurement were taken before and after treatment. Statistical analysis were performed. Results After treatment, maxillary and mandibular anterior teeth were arranged in dental arch neatly. Molar relationship and overjet and overbite were returned normal. SNB, ANB angle and Co-Po, Iis-SP, Mis-SP were remarkably changed. Conclusion The mandibular protraction appliance is an orthopedic force applicance. It can effectively induce forward movement of mandible and in the meantime restrain maxillary growth. It is feasible for the treatment of mandibular retrognathia.
出处
《中华医学美学美容杂志》
2005年第3期140-142,共3页
Chinese Journal of Medical Aesthetics and Cosmetology
