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目的观察半固定式Twin-block矫治器在恒牙列早期安氏Ⅱ类1分类错伴拥挤的治疗效果。方法选择25例安氏Ⅱ类1分类伴拥挤患者,采用半固定式Twin-block矫治器治疗,通过测量治疗前后X线头影的数据,进行统计学分析,比较疗效。结果矫正后25例的下颌后缩及牙弓的拥挤度得到了改善,模型及X线头影测量数据显示牙弓拥挤度、SNB、ANB、U1-L1、U1-NA、L1-NB、IMPA、FMIA等出现了显著的变化。结论半固定式Twin-block对生长发育高峰期后恒牙安氏Ⅱ类1分类错伴拥挤疗效显著,有良好的扩弓能力,在解除患者牙弓拥挤方面效果明显,同时能诱导下颌向前,改善患者的面型及覆覆盖。
Objective To observe the effect of semi-fixed Twin-block appliance on the crowding of Class Ⅱ division 1 malocclusion in the early stage of permanent dentition. Methods Twenty-five patients with Class Ⅱ division 1 malocclusion were selected and treated with semi-fixed Twin-block appliance. The data of X-cephalometry before and after treatment were statistically analyzed and compared. Results The correction of mandibular retrusion and crowding of dental arch were improved in 25 cases. The crowding degrees, SNB, ANB, U1-L1, U1-NA, L1-NB, IMPA, FMIA and other significant changes have taken place. Conclusion Semi-fixed Twin-block has a crowding effect on Class Ⅱ division 1 malocclusion after peak growth and development, and has good expansion ability. It has obvious effect in relieving crowding of dental arch and can induce mandibular direction Before, to improve the patient’s face and cover covered.