改良式Forsus矫治器治疗下颌后缩患者的疗效观察

目的 观察改良式Forsus矫治器治疗下颌后缩患者的临床疗效。方法 18例下颌后缩患者在直丝弓矫治技术排齐整平上下牙列后，应用改良式Forsus矫治器进行功能性矫形治疗，并在治疗前后拍摄头颅侧位片，通过 SPSS 12.0统计学软件对治疗前后的测量结果进行配对 t 检验分析。结果 改良式Forsus矫治器治疗6-8个月后，18例患者的下颌均明显前移，下颌后缩面型显著改善。其中B点前移（2.9±3.1） mm，ANB角减小（2.5±1.2）°，前牙覆盖减小（5.0±2.8） mm，磨牙关系由远中关系改为中性关系，平面角增加（4.3±2.2）°，治疗前后的差异具有统计学意义（P<0.05）。结论 改良式Forsus矫治器与直丝弓矫治技术联合应用，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，改善Ⅱ类咬合关系和下颌后缩面型。

Clinical Effect of Modified Forsus Appliance to Children with Mandibular Retrusion

OBJECTIVE: To evaluate the effects of modified Forsus appliance in the treatment of Class II mandibular retrusion. METHODS: 18 children with mandibular retrusion were selected and treated with modified Forsus appliance. Cephalometric radiographs were taken and analyzed at pre-treatment and post-treatment. Students' t-test was used to determine if there were significant differences between pre-treatment and post-treatment. RESULTS: After 6-8 months of therapy, profiles were obviously improved. B moved forward (2.9+/-3.1) mm. ANB decreased (2.5+/-1.2) degrees. The overjet decreased (5.0+2.8) mm. The molar relationship was corrected to Class I from Class II. SN-OL increased (4.3+2.2) degrees. There was significant difference between pre-treatment and post-treatment. CONCLUSION: Combined with straight wire appliance, modified Forsus appliance can effectively stimulate the mandibular growth, balance the jaw relationship, and correct mandibular retrusion.