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中文摘要：
目的 调查上海市替牙期小学生错牙合畸形患病率及类型,为早期矫治提供科学依据。方法 对7～11岁小学生随机抽样调查,按Angle错牙合分类法进行统计。结果 受检小学生中错牙合畸形患病率为48.67%,男女有统计学差异。错牙合类型以AngleⅡ类最多,占50.23%。在各种错牙合畸形类型中,较为明显的是深覆盖、深覆牙合、轻度拥挤和反牙合,发生率分别是63.93%、58.90%、38.36%和18.69%。结论 上海市替牙期小学生错牙合畸形患病率较高,错牙合类型构成比及主要类型发生变化,应加大力度普及错牙合畸形早期防治知识,有针对性地进行早期矫治。
英文摘要：
Objective To investigate the prevalence and types of malocclusion in mixed dentition of students in primary school of Shanghai and further to provide a scientific basis for early treatment. Methods A randomized sampling investigation was conducted in students of primary school aged from 7 to 11 years old and analyzed statistically according to Angle＇s classification methods. Results The prevalence of malocclusion among the tested students was 48.67% and a statistically significant difference was found in gender. Angle Ⅱwas the most prevailing type of malocclusion with the prevalence 50.23%. All types of malocclusion symptoms were analyzed. The occurring rate of deep overjet was the highest （63.93%）, followed by deep overbite （58.90%）, dental crowding （38.36%） and cross-bite （ 18.69% ）. Conclusion The prevalence rate of malocclusion in mixed dentition of primary school students in Shanghai is very high. The constituent ratio and types of malocclusion symptoms have obviously changed. Therefore, knowledge on early preventive treatment should be popularized widely and a series of corresponding preventive measures should be carried out in advance.
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