目的:探讨肌激动器对不同骨面型的安氏Ⅱ类1分类患者矫治前后软硬组织变化的影响.方法:纳入22例骨性安氏Ⅱ类1分类患者[(男12例,女10例,平均年龄(11.5 ±0.67)岁],根据其骨面型分为低角组(n=15)和均角组(n=7).肌激动器矫治前后拍摄头颅侧位定位片,头影测量分析治疗前后软硬组织的变化.用SPSS 13.0软件,t检验分析治疗结果差异.结果:所有患者治疗前后Co-Pg、ANB、Wits、NA-Pg、LI-APg和L6-MP值差异具有统计学意义(P＜0.05).骨组织项目中低角组和均角组治疗前后Wits值变化分别为1.34°±1.82°和3.50°±1.77°,NA-Pg值变化分别为(3.06±2.00) mm和(5.80 ±3.17) mm,牙齿项目中L1-APg变化值分别为(-1.16±1.74)mm和(-2.83±1.48)mm,组间差异均具有显著统计学意义(P＜0.05).低角与均角组软组织测量项目比较差异无统计学意义(P＞0.05).结论:肌激动器矫治低角和均角骨性安氏Ⅱ类1分类患者均能取得较理想的治疗效果,均角患者对矫治器的反映效果好于低角患者.%Objective:To evaluate skeletal,dentoalveolar and soft tissue profile changes by activator therapy in patients with different skeletal patterns of Class Ⅱ1 malocclusions.Methods:22 subjects(10 girls,12 boys,mean age 11.5 ±0.67 years) in the mixed or early permanent dentition,were included and divided into low angle(n =15) and average angle(n =7) groups on the basis of skeletal pattern.All patients were treated with a traditional activator.The skeletal,dentoalveolar and soft tissue profile changes were compared on lateral cephalograms before and after treatment.Statistical analysis was performed with t-test of SPSS 13.0 at a level of significance of P ＜ 0.05.Results:Activator treatment in these growing patients resulted in a correction of the skeletal Class Ⅱ relationship (decrease of ANB,Wits and NA-Pg),an advancement of the mandibular structures(increase of Co-Pg and L1-APg),and changes of the teeth(increase of L6-MP).The changes of Wits,NA-Pg and L1-APg value of low and average angle groups were 1.34° ± 1.82 ° and 3.50 ° ± 1.77°,(3.06 ± 2.00) mm and (5.80 ± 3.17) mm,(-1.16-± 1.74) mm and (-2.83 ± 1.48) mm respectively(P ＜0.05).No statistical significance was found in the soft tissue profile changes whether intra-class or inter-group comparison.Conclusion:The activator appliance is effective in treating growing patients with mandibular deficiency,and mandibular reconstruction,in patients with average angle it is more effective than in those with low angle.
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