PASS生理支抗技术矫治双牙弓前突错的临床研究

Clinical evaluation of the treatment of bimaxillary dentoalveolar protrusion with physiological anchorage control technique

目的探讨PASS生理支抗技术治疗双牙弓前突错的临床效果。方法选择双牙弓前突病例20例,男6例,女14例,平均年龄19.7岁,拔除4个第一前磨牙,应用PASS生理支抗矫治技术进行矫治,对治疗前后头颅侧位片进行测量,并对结果进行统计学分析。结果治疗后与牙齿、软组织有关的测量指标发生显著性变化,上下切牙切缘分别向远中移动5.32mm和4.76mm,上下磨牙近中移动2.02mm和2.67mm,鼻唇角增大,上下唇至审美平面距离明显减少(P<0.05),而骨性测量指标SNA,SNB,MP/SN治疗前后无显著性变化(P>0.05)。结论 PASS矫治器在没有额外支抗的条件下可以有效矫治双牙弓前突。

Objective To investigate the clinical effect of physiologic anchorage control technique in the treatment of bimaxillary dentoalveolar protrusion. Methods A total of 20 patients with bimaxillary protrusion were included. The patients were treated with PASS appliance after their 4 first premolars were extracted. Cephalometric radiographs were taken before and after the treatment. The results were evaluated. Results After treatment,the indexes related to the teeth and soft tissues significantly changed. The edges of the upper and lower incisors were retracted for 5. 32 mm and 4. 76 mm. The upper and lower molars were protruded for 2. 02 mm and 2. 67 mm respectively. There was remarkable decrease of distance from lip to E-line and significant increase of NLA angle（ P 〈 0. 05）. But,there were no significant changes in SNA,SNB,ANB and MP/SN angle before and after treatment. Conclusion Physiological anchorage control technique can be effectively applied in the treatment of patients with moderate bimaxillary protrusion.