The Prevalence and Risk Factors of Dental Caries of Permanent Teeth among 12-year-old Students in Guangdong, South China
Abstract Background: Analyses of factors related to dental caries in the population have been reported in some cities and provinces of China. However, large-scale field data evaluation at a provincial level is lacking. The aim of this study was to explore the factors related to caries in the permanent dentition of 12-year-old students in Guangdong province.MATERIALS/METHODS: Equal-sized groups of urban and rural students (960 of each) in Guangdong were selected by stratified, multistage random sampling with a gender ratio of 1:1. All participants were required to undergo an oral health examination. Information concerning the subjects’ family background, dietary habits and relevant oral health behaviour was collected in a structured questionnaire. Logistic regression analysis was used to study the factors related to dental caries. The independent variables included gender, residence, socio-economic status, dietary factors, and oral health measures, among others.RESULTS: Multivariate conditional logistic regressions showed that rural residence (odds ratio (OR)=1.676, 95% confidence interval (CI): 1.350-2.080, P<0.001), female gender (OR =1.377, 95%CI: 1.115-1.701, P =0.003), frequent consumption of sugary snacks (≥ once a day vs. < once a day) (OR=1.484, 95%CI: 1.123-1.962, P =0.006), and calculus (OR =1.391, 95%CI: 1.122-1.724, P =0.003) were risk factors for dental caries, while the father’s education level (>9 years vs. ≤ 9 years) (OR=0.796, 95%CI: 0.638-0.993, P =0.043) was a protective factor.CONCLUSION: Rural residence, female gender, poor oral hygiene and frequent consumption of sugary snacks were the main risk factors for caries of the permanent teeth in 12-year-old students.