Abstract:

Objective To investigate the prevalence of dental caries of  childre
n in Changchun area and to explore the disease-related influencing factors,and
to provide epidemiological evidence for the prevention and treatment of dental caries of children in Changchun area.
Methods The survey was performed by using multi-stage sampling investigation method.3 districts of Changchun City

(Chaoyang District,Nanguan District and Kuancheng District) and 3 counties (Nongan County,Yushu
City and Dehui City) were selected as the research regions by chester sampling meth
od. 991 students of 6 primary schools(the fifth and sixth grades) and 6 middle schools (the first and second grades)were selected as objects

of study by stratified sampling method.The survey was carried on with the epidemiological questionn
aire (such as the arrangement of teeth,dental plaque,gingivitis,the prevalence of

dental examination,postprandial gargle,frequency of tooth brushing,nutritional status,taking calcium

and sleep time,individual eating habits and famil
y factors)and the prevalence rate was calculated.Results
Of all the children,the overall rate of dental caries was 51.77%,and the prevalence rate of dental caries
in grade 5 of primary school,grade 6 of primary school, first-year of junior middle school and second-year of

junior high school were 57.91%,52.48%,48.16,and 48.98%,respectively.The prevalence rate of dental caries had a  downward trend with  the age
increasing,but there were no significant differences between different grades（P>
0.05）.The prevalence rate of dental caries of children in city was higher than
 that in county(P<0.05).The prevalence  rate of dental caries of children who got caries was higher than those who did not get caries（P<0.05）.Calcium supplements,shorter sleeping time,no mouthwash after every meal,irregular arrangement of teeth
,dietary bias,cacotrophia,eating snacks or sweets yogurt frequency,the only one child,parents suffering caries,lower degree of parents’ attention on oral
 health,and the lower family income were  the important factors of the occurrence of dental caries.Gender,breeding methods,brushing frequency and parental oc
cupation were not the important factors of the occurrence of dental caries.Logistic regression analysis showed that gingivitis,no regular oral examination,ba
cterial plaque,drink milk with sugar,shorter sleeping time,dietary bias，and cacotrophia  were  the important factors of the occurrence of dental caries.
Conclusion Radical cure of  gingivitis,keeping regularly dental examination,removing plaque,drinking milk without sugar,ensuring sleeping time,correcting the
  partial eclipse and malnutrition can prevent dental caries of  children,and  the prevention and treatment of dental caries of children in county should be strengthened.

Key words: tooth,deciduous, caries, prevalence；child, bacterial plaque, gingivitis