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目的观察Twin-block矫治器治疗Ⅱ类骨型错牙合畸形患者的临床效果。方法选择Ⅱ类骨型错牙合患者27例,应用Twin-block矫治器进行治疗,平均治疗时间为9.4个月,X线头影测量分析患者硬组织及上气道相关指标,对比治疗前后患者上述指标的变化情况。结果治疗前后SNA差异无统计学意义(P>0.05);治疗后SNB、LI-MP、Co-Po均增加,差异均有统计学意义(P<0.05),下颌骨位置前移,长度增加;治疗后ANB、UI-SN减小,差异有统计学意义(P<0.05);鼻咽段前后径宽度减小,差异无统计学意义(P>0.05);腭咽段、舌咽段、喉咽段前后径宽度增加,差异有统计学意义(P<0.05)。结论 Twin-block矫治器能有效促进Ⅱ类骨型错牙合患者下颌骨生长,增加上气道前后径宽度。
Objective To observe the clinical effect of Twin-block appliance in the treatment of type Ⅱ malocclusion. Methods Twenty-seven patients with type Ⅱ malocclusion were treated with Twin-block appliance. The mean treatment time was 9.4 months. The patients ’patients’ hard tissue and upper airway related index were analyzed by X-ray. Indicator changes. Results There was no significant difference in SNA before and after treatment (P> 0.05). SNB, LI-MP and Co-Po all increased after treatment (P <0.05) After treatment, the ANB and UI-SN decreased, the difference was statistically significant (P <0.05); the anteroposterior diameter of nasopharyngeal pharyngeal decreased, the difference was not statistically significant (P> 0.05); velopharyngeal, Before and after the pharyngeal segment width increased, the difference was statistically significant (P <0.05). Conclusion Twin-block appliance can effectively promote the growth of mandibular bone in patients with type II malocclusion and increase the anteroposterior diameter of upper airway.