【摘要】 目的观察用两期矫治方法治疗替牙期下颌后缩畸形。方法I期治疗应用肌激动器加口外弓矫治,改善下颌后缩状况。II期用方丝弓治器进一步稳定上下颌骨关系,精确调牙位与牙合位。结果经X线头颅侧位片头影测量:CO-PG增加2.5mm,Z角增加3.99°;ANB减少2.8°;1-S减少6.1°;1(ī)-MP减少3.26°。结论两期治疗替牙期下颌后缩畸形有明显的效果。更多还原

【Abstract】 Objective To observe the curative effect of treatment employing two-stage rectification method on the deformation of mandibular retrusion in dental transitional period. Method In stage I treatment, rectification using a muscle stimulator plus an outward bow gag was applied to improve the condition of mandibular retrusion. In stage II, a square silk bow gag was used to further stabilize the relation between maxilla and mandible, and to precisely align the tooth position and tooth occlusion position. Result X-ray cephalometrics of lateral position of the head showed that: CO-PG increased by 2.5mm; the Z angle increased by 3.99°; ANB decreased by 2.8°;1-S decreased by 6.1°; 1(ī)-MP decreased by 3.26°. Conclusion There is a remarkable effect of two-stage treatment on the deformation of mandibular retrusion in dental transitional period.更多还原