改良式Forsus矫治器与肌激动器治疗下颌后缩的疗效比较

Comparison of efficacy between modified forsus appliance and activator appliance in the treatment of class Ⅱ patients with madibular retrusion

目的 探讨改良式Forsus矫治器与肌激动器（Activator）治疗安氏Ⅱ类下颌后缩患者的临床疗效.方法 分别用Forsus矫治器（A组）和肌激动器（B组）,联合固定矫治器对两组安氏Ⅱ类下颌后缩患者进行功能性矫形治疗,治疗前后拍摄头颅侧位片,并进行Pancherz头影测量和分析.结果 A组患者治疗时间（21.4±2.0）个月,B组治疗时间（27.3±2.5）个月,差异具有统计学意义.两组经过改良式Forsus矫治器与肌激动器联合固定矫治器治疗后,患者软组织改善明显,下颌后缩面型显著改善.前牙覆盖均减少,磨牙关系纠正为Ⅰ类关系.SNB角增大,ANB角缩小,软组织侧貌改善较大,两组测量项目治疗前后比较,差异均有统计学意义,但组间差异无统计学意义.治疗后,B组骀平面的变化较明显.结论 改良式Forsus矫治器与肌激动器均可以有效地促进下颌骨的生长发育,协调上下颌骨的位置关系,显著改善Ⅱ类咬合关系以及下颌后缩面型.但改良式Forsus矫治器24 h发挥作用,不依赖于患者的配合性,能够更好地进行生长改良,缩短患者的矫治疗程,在矫治效率和矫治时间方面,明显优于肌激动器.

Objective To evaluate and analyze the effects between with modified Forsus appliance and activator in the treatment of class Ⅱ madibular retrusion.Methods 70 children with class Ⅱ malocclusion and mandibular retrusion were selected and divided into two groups：35 patients treated with this modified Forsus appliance （group A） and other 35 treated with activator （group B）.Cephalometric radiographs were taken and analyzed at the pre-treatment time （T0） and the post-treatment time （T1） with the Pancherz analysis.Results The course of treatment was obviously different：the course of group A was （21.4±2.0） months,and group B was （27.3±2.5） months; the treatment course of group A was shorter than that of group B.After treatment,profiles of the two groups were obviously improved.The trends were similar in overjet and the molar relationship,SNB and ANB,with significant differences.But there was no significant difference between the results of the two groups.The change of occlusal plane was notably in group B.Conclusions Both the modified Forsus appliance and activator appliance combined with straight wire appliance can effectively stimulate the mandibular growth,balance the jaw relationship,and correct the class Ⅱ mandibular retrusion.But the modified Forsus appliance can effectively treat the class Ⅱ patients with the shorter course.And the same time,it can take effect continually without depending on the coordination of the patients.