西北地区替牙期骨性Ⅲ类错构成分析

Composing of Northwestern Chinese Children with Skeletal Class Ⅲ Malocclusion in the Mixed Dentition

目的:分析西北地区替牙期骨性Ⅲ类错的构成。方法:采用计算机辅助X线头影测量技术,对第四军医大学口腔医院正畸科03～08五年间替牙期骨性Ⅲ类错的回顾性研究,分析骨性Ⅲ类患者在矢状向与垂直向的构成。结果:矢状向主要表现为上颌正常,下颌发育过度;其次为下颌正常,上颌发育不足。其它类型占比例较低。垂直向主要表现为高角或均角,低角较为少见。结论:替牙期骨性Ⅲ类错的表现形式存在差异,研究其构成有利于我们进一步认识此类错的成因,并对其防治提供一定的参考。

Objective：To investigate the composing of Northwestern Chinese children with skeletal class Ⅲ malocclusion in the mixed dentition.Methods：Cephalograms of mixed dentition children with skeletal class Ⅲ malocclusion in Department of Orthodontics,School of Stomatology,the Fourth Military Medical University were retrospectively investigated by computerized cephalometric analysis.Both sagittal and vertical craniofacial pattern were evaluated.Results：In sagittal direction,mandibular protrusion with normal maxillary was the most common type.The next was maxillary retrusion with nomal mandibular.The percent of other types were much lower.In the vertical direction,the most common types were high angle or neutral angle,low anlge cases were not familiar.Conclusion：There are some differences in the craniofacial pattern of skeletal class Ⅲ malocclusion in the mixed dentition.To study the composing of it will help us to better understand the etiology of class Ⅲ malocclusion.