【摘要】 目的　探讨Activator矫正器的作用机理。方法　应用随机原理 ,将生长发育高峰期骨性Ⅱ类错牙合畸形分为三组 ,一年后评价各组上下颌骨骨性关系。结果　骨性Ⅱ类错牙合畸形在生长发育高峰期上下颌骨均有生长 ,但不足以自行调整至正常。Activator及头帽型Activator可显著改善上下颌骨骨性关系。结论　Activator适合于下颌发育不足或位置后缩者 ,头帽型Activator更适合于下颌发育不足伴上颌发育过度或位置前突者。更多还原

【Abstract】 Objective To investigate the effect of Activator in the treatment of skeletal Class Ⅱ malocclusion.Methods 82 children at peak high velocity on the growth curve were randomly divided into three groups:①control group:no treatment;②Activator appliance group;③Headgera Activator group.Results Activator and Headgear Activator could distinctly improve the skeletal jaw relationship.Conclusion Activator is suitable for treatment of Angle Class Ⅱ malocclusion with retrusive mandible.Headgear Activator should be applied to treat ment of Angle Class Ⅱ malocclusion with maxillary protrusion and retrusive mandible.更多还原