Epidemiological survey of malocclusion in 8-9 year-old children in Qingdao Laoshan district

Abstract

PURPOSE To investigate the prevalence of malocclusion and the correlation between caries and malocclusion in mixed dentition of primary students in Laoshan district of Qingdao city, to provide a scientific basis for early orthodontic treatment. METHODS According to WHO's oral health survey (basic methods), a survey concerning oral health was performed in 1803 children aged 8-9 years old. SPSS 17.0 software package was used for statistical analysis . RESULTS 1322 of 1803 pupils suffered from malocclusion, the prevalence of malocclusion in children surveyed was (73.32%). There were 519 cases(39.26%) of Class I malocclusion, 374 cases(28.29%) of Class II malocclusion, 357(27.00%) cases of Class III malocclusion, 72 cases (5.45%) with asymmetric malformation. As regard to clinical manifestations, deep overbite accounted for(37.67%) ,followed by deep overjet(29.19%), dental crowding (16.94%) and crossbite(16.03%). The prevalence of caries was 64.23%. Among them, there were 625 males (34.66%) and 532 females(29.51%). CONCLUSIONS The prevalence rate of malocclusion in mixed dentition of primary students in Laoshan district of Qingdao district is not optimistic, the incidence of malocclusion is closely related to caries.