中文摘要：

目的：探讨西安市中青年人群患龋的行知危险因素，为制定有针对性的预防措施提供依据。方法：选择西安市新城区5所小学二、三年级小学生家长，进行口腔健康检查和行知因素问卷调查，提取其中31-40岁城市中青年人群585人，根据龋失补牙数将其分为两组：有龋组（DMFT≥1）324例、无龋组（DMFT=0）261例，对两组人群的口腔健康行知等因素进行对比和统计分析。结果：西安市31-40岁中青年人群患龋率为55．4％，龋均1．85±2．370。单因素）（。检验显示：有龋和无龋中青年人群的性别分布、学历构成、刷牙方法、口腔常规检查频次、口腔健康意识、口腔健康知识、家庭月收入等因素差异显著。Logistic回归分析表明：性别、学历、刷牙方法、口腔健康意识、认为看牙占收入比例与中青年人群是否有龋存在相关性；女性、低学历、刷牙方法错误、口腔健康意识低的人群患龋风险较高；而有龋人群倾向看牙费用占收入比例较高。结论：加强对中青年人群口腔健康行知教育、指导使用正确刷牙方法、将女性和低学历人群作为重点人群，对于中青年人群龋病预防策略更具现实意义。

英文摘要：

AIM： To investigate carious relevant risk factors in middle-aged and young people of Xincheng town, Xi＇ an, thus providing theoretical basis for the strategy of caries prevention. METHODS： 585 subjects aged 31 -40 years old from Xincheng town, Xi＇an, were included in the study. 324 of them were in carious group （DMFT≥ 1 ） , and 261 in noncarious group （DMFT = 0）. The individuals in both groups received oral health examination and questionnaire survey on oral health knowledge and behavior relevant factors. The data obtained were analysed statisti- cally using Single factor X^2 test and Logistic regression analysis. RESULTS： The caries incidence of all the subjects was 55.4% and the average individual caries was 1.85 ±2. 370. Single factor X^2 test showed that there were statistical differences （P 〈 0.05） on the gender distribution, education background constitution, tooth-brushing method, fre- quency of routine oral examination, awareness of oral health, knowledge of oral health and family income between thecarious and noncarious groups. Logistic regression analysis showed that caries occurrevce was related to following fac- tors ： gender, education background, tooth- brushing method, awareness of oral health, view on the cost for going to a dentist. There was a higher caries ineidenee in the female and in the subjects with lower education background, wrong application of tooth-brushing and little awareness of oral health. And the carious population tend to accept higher cost for going to a dentist. CONCLUSION： Strengthening oral health education and directing tooth-brushing method may be practical and beneficial for middle-aged and young people in caries prevention. More attention should be palid to the female and the people with low education background.