Investigation on prevalence of malocclusion among children in Taiyuan city

Objective To investigate the prevalence,proportion,clinical manifestation and related factors of different types of malocclusion in the mixed and permanent dentitions among children and juvenile in Taiyuan city.Methods Based on the individual normal occlusion and Angle's classification of malocclusion,standard investigation form was made.In five schools,a random sample of 7 785 elementary and middle schoolchildren of mixed and permanent dentitions was enrolled for physical examinations and questionnaire.Results ①The prevalence of malocclusion was 57.74%,including 59.52% for males and 55.50% for females(P0.05).②The proportion of Angle's classification of malocclusion was as follows from high to low:classⅠclass Ⅱ1class ⅢclassⅡ2.③On clinical manifestation of malocclusion,the prevalence of crowding was 58.64%,which was the highest.Conclusion The prevalence of malocclusion in Taiyuan city is much higher.Different types of malocclusion show distinct manifestation.It is essential to carry out preventive and interactive treatment as early as possible.Meanwhile,it must be enforced to introduce the knowledge on malocclusion.