McNamara分析法评价改良SUS2矫治器治疗安氏Ⅱ类错牙合的临床疗效

摘要

Objective To compare the dentofacial changes produced by refined Sabbagh Universal Spring ( SUS2 ) in late adolescent patients with ClassⅡ malocclusion, and to quantify them in comparison with patients treated by traditional appliance. Methods The study was carried out on two groups of ClassⅡpatients. McNamara cephalometric analysis was performed on lateral cephalometric radi⁃ographs before and after treatment. Results Both the refined SUS2 group and traditional group reduced the distance of A to N⁃FH, the values of which were 0.6 and 0.4mm, respectively. Lower 1 horizontal to FOP ( function occlusal plane) moved forward by 0.3 and 1. 5mm. As to Lower 1 –Apo, the changes of the two groups were 0.6 and 2.5mm, respectively (P<0.05). Conclusion Both appli⁃ances corrected Class II discrepancies through dentoalveolar changes. However, refined SUS2 appliance can promote mandible forward earlier before leveling the teeth compared to the traditional method, thus taking more advantages of the patients’ growth potential.%目的：采用McNamara分析法评价改良SUS2矫治器矫治安氏Ⅱ类错牙合的效果。方法分别采用改良SUS2矫治器和传统SUS2矫治器治疗共20例安氏Ⅱ类错牙合，对治疗前后头颅侧位定位片采用McNamara分析进行分析比较。结果改良SUS2组和SUS2组都造成了上齿槽座点（A点）到鼻根点到眶耳平面（N⁃FH）垂线距离的减小，分别减小了0．6 mm和0．4 mm。下切牙切缘沿功能牙合平面（function occlusal plane，FOP）前移了分别为0．3 mm和1．5 mm。对于下切牙切缘到上齿槽座点与颏前点连线（ L1–Apo），则分别前移了0．6 mm和2．5 mm。结论改良SUS2矫治器可以取得和传统SUS2矫治器相似的临床效果，但允许在排齐牙列之前就前伸下颌，可以更好地利用患者的生长潜力。