Correlation Between Dental Caries Prevalence in Primary Teeth and First Permanent Moilar of Children in Mixed Dentition Stage

to find the clinical relation between caries experience in primary teeth and first permanent molar in mixed dentition stage using def index for primary teeth , DMF index for first permanent molars and to find the clinical relation between caries prevalence in the selected children in relation with other associated factors such as age, sex tooth brushing frequency, dietary habits and mother's attitude toward child's oral health.