海南医科大学学报

目的:探讨Twinblock矫治器治疗早期安氏Ⅱ类下颌后缩错畸形的临床应用。方法:选取在本院门诊接诊的正畸病例32例,随机分成观察组(16例)和对照组(16例)。观察组选用Twinblock矫治器改善颌间关系,再用直丝弓矫治器排齐牙列,矫治咬合关系。对照组直接用直丝弓矫治器对安氏Ⅱ类错牙合患者进行矫治,对比治疗时间和治疗效果以及治疗前后变化。结果:观察组治疗时间为(26.8±1.2)个月,少于对照组[(32.5±1.7)个月],差异具有统计学意义(P<0.05)。两个组别在矫治后磨牙关系中性,咬合关系稳定,前牙覆合覆盖正常。但观察组治疗后下颌骨发生明显前移,同时下颌骨长以及下面高度均比对照组效果明显,差异有统计学意义(P均<0.05)。观察组在治疗前后,在矢状线上和在垂直线上各指标数据和对照组相比,差异有统计学意义(P均<0.05)。结论:使用Twinblock矫治器治疗早期安氏Ⅱ类错患者时,能够对下颌生长产生刺激,同时矫正颌骨矢状关系,易于取得患者配合,明显改善患者侧貌,简化后期固定矫治,治疗时间短,疗效更佳,值得临床推荐。

Objective:To investigate the application of Twin block appliance in early angle classⅡmalocclusion.Methods:A total of 32cases of orthodontic patients were randomly divided into observation group(16cases)and control group(16cases).Twin block appliance was applied to improve relation between the jaws and then straight wire appliance was applied to correct malocclusion.For the control group,straight wire appliance was applied to correct malocclusion.Treatment effect and transformation before and after treatment were compared.Results:The observation group's treatment time was(26.8±1.2)months,significantly less than(32.5±1.7)months of the control group,the difference was statistically significant(P<0.05).After treatment,both groups had neutral molar relationship,stable occlusal relationship,and normal anterior teeth overbite.But after treatment,antedisplacement of jawbone was obvious in the observation group,improvement in the rate of length and the height of jawbone were obviously higher than that of the control group(Pall<0.05).Improvement of data in the sagittal line and the vertical line after treatment was significant in the observation group comparing with that in the control group(Pall<0.05).Conclusion:Twin block appliance is useful for treatment of early angle classⅡ malocclusion since it can stimulate the growth of mandible and correct sagittal jaw relations.Thus it is worthy to recommend.