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Objectives: This work aims to examining the latest early childhood caries situation in children aged 3 and 5 and its related risk factors in Zhejiang Province during the COVID-19 pandemic. Method: There are 3,537 children and their main caregivers participate in this study. We used chi square test or U-test to analyze whether there were differences in the prevalence of dental caries under different variables. The risk factors on ECC were determined by multivariate logistic analysis. Results: The ECC rate of children in this study was 57.51%. The mean decayed missing filled teeth (dmft) scores were 3.01. The result of multivariate logistic analysis showed higher ECC prevalence was found in children as age increasing, with lower district economic level, with high frequency of confectionary consumption, having oral medical treatment behavior and bad evaluation of children's oral health by parents. Conclusion: In general, the prevalence rate of ECC in this study was lower than five years ago, but still higher than those developed countries. And it was associated with age, district economic level, frequency of confectionary consumption, oral medical treatment behavior and evaluation of children's oral health by parents.

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Objective:This study was to explore the effect of HBM-based education and to help establish the measures on improving oral health status in deaf-dumb students. Methods:A total of 152 students aged 9-18 from two deaf-mute schools in Jing'an District， Shanghai were selected. The study subjects were randomly assigned to either experimental or control group. Students in the control group received oral health education with sign language every 6 months， and students in the experimental group received oral health education based on HBM. Before and two years after the intervention， data were collected by oral examinations and questionnaires. SPSS 22.0 software package was used for statistical processing of the data. Results:Before the intervention， there was no significant difference between the control group and the experimental group in caries rate， soft scale detection rate， calculus detection rate， caries average， debris index and calculus index. After the intervention， the caries rate （47.3% vs 68.5%）， soft scale detection rate （77.0% vs 91.8%）， and calculus detection rate （37.8% vs 58.9%） in the experimental group were all significantly （P<0.05） lower than those in the control group. After the intervention， caries average， debris index and calculus index in the experimental group were 1.93±2.25， 0.55±0.45， and 0.37±0.50， respectively， while the corresponding values in the control group were 2.82±3.24， 1.17±0.47， and 0.41±0.44. The difference in debris index between two groups was statistically significant （P<0.05）. Conclusion:Oral health education for deaf-mute students based on Health Belief Model（HBM）shows a good effect on improving the oral health. Further oral health education as well as the implementation of intervention measures such as using local fluoride， pit and fissure sealing， and early dental caries filling， are needed to effectively control the occurrence and development of dental caries in deaf-mute students.

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OBJECTIVES: This work aims to exploring the risk factors related to ECC by investigating oral health status, related behaviours and habits of children and their parent's knowledge regarding oral hygiene. METHOD: A total of 2700 children aged 3-5 years and their parents from Zhejiang province were examined. Chi-square test or U test was used to analyse the difference of caries incidence among different groups. Logistic multiple factor stepwise regression model was used to analyse the risk factors influencing ECC prevalence. RESULTS: ECC prevalence rate in these children was 70.7%. The mean decayed missing filled teeth(dmft) scores were 4.33. Through analysis of logistic multiple factor stepwise regression model, risk factors related to the prevalence of ECC in children include: older age, region (coastal or mountainous area), higher frequency of bedtime dessert consumption and poor care of children's oral health by parents. In the questionnaire, 5 of 14 questions showed parents' poor oral knowledge or awareness. CONCLUSION: The prevalence rate of ECC in children aged 3-5 in this study was high and associated with older age, region (coastal or mountainous area), higher frequency of bedtime dessert consumption and poor care of children's oral health. Parents need to strengthen their understanding and action of dental caries.

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