| Caries is due to bacteria in dental plaque ferment the sugar in food to acid dissolution of enamel demineralization, dental hard tissue destruction as a chronic progressive disease.Its characteristic is caused by bacteria enter tooth tissues, the organic composition, and its structure of enzymatic hydrolysis, form, the consequences of cavity for pulp necrosis, root, and the surrounding tissue infection causes pain. The threat to mankind together with periodontal disease of oral health, WHO put two listed it after the cardiovascular diseases and cancer prevention and treatment of disease of the three key. Pre-school children, that is 3-5 years old children in a special period of growth and development, due to the special diet and normal oral hygiene has not been established, so the incidence of dental caries in caries etiology also be different. In recent years, many scholars have done a lot of research work, they found that poor feeding habits, poor eating habits, poor oral hygiene fliers about the risk factors leading to dental caries. Children can spread more teeth caries disease caused extensive damage, not only of the serious caries affect children's health, but also brings great difficulty for treatment.Currently, there is no pre-school children aged 3-5 years in Daqing City, caries prevalence and related information, the lack of development of caries in children in Daqing City, based on preventive measures.Objective:About 3-5 years old children in Daqing City, incidence of dental caries, and discuss the pathogenesis of the relevant factors, as Daqing prevention and treatment of caries in children provide the epidemiological evidence.Methods:In accordance with the third national epidemiological survey of oral health requirements, cluster sampling method to randomly selected kindergartens in Daqing City,696 children aged 3-5 caries examination, prevalence of dental caries and caries on equal indices survey. Results were analyzed by SPSS13.0 statistical package, including t test,χ2 test, ANOVA analysis.Results:1. In all children by the inspection, the primary tooth caries, caries and filling rates were 30.3%,2.91 and 50.4%, with age, prevalence of caries, caries and filling rates were increased.2. The statistical test, the age between the teeth caries rate, caries are significant rate and filling difference (P<0.05). But the boys and girls of decay, and filling rate were no significant difference (P>0.05).3. In all children by check, dental caries bit high to low order:maxillary incisors milk> first deciduous molar> lower first deciduous molars> upper lateral incisor milk> maxillary second deciduous molar> maxillary first deciduous molars> upper Rujian teeth> tooth mandibular Rujian> Mandibular Primary lateral incisors> mandibular incisors milk.4. Birth status, feeding patterns, the number and frequency of snacking, and began brushing time, brushing frequency, whether brush the teeth effectively after eating, parents level of education of children are 3-5 years old children caries the main factors.Conclusion:1.3-5 years old children in Daqing City, early primary tooth caries, filling the low prevalence of dental caries of deciduous teeth, caries and filling rates were 30.3%,2.91 and 50.4%, respectively, and tended to increase with age, children should be undertaken as soon as possible caries disease prevention.2.3-5 years old children in Daqing City, deciduous teeth caries was symmetrical features, and its predilection for the maxillary teeth and mandibular incisors milk second molars.3. Premature newborns, improper feeding, frequent and large eating snacks, late start brushing time, brushing fewer or don't brush, brush your teeth after eating can't be effective, and the lower level of education of parents is 3-5 years old children in Daqing City caries risk factors.
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