Abstract: Objective    To investigate the current statues of caries in permanent teeth and development  trend of the disease among 12-year-old students in Daqing，and to provide scientific fundation to guide the oral health. Methods           A total of 510 students were randimly selected in Daqing for disease epidemiology investigation .The results were analyzed by using statistical software SPSS17.0 . Results    The prevalence of caries was  27.06%和32.11%， which showed no difference（P＞0.05）.The filling rate of students in 2011（15.1% ）was higher than that in 2010（9.5%）（P＜0.05）.The DMFT was 0.58 ± 0.77和0.68 ± 0.98 ，which showed no difference（P＞0.05）. The prevalence of caries of female（30.43%）was higher than male（21.24%）（P＜0.05）. Conclusion    The caries rate is at low level among 12-year-old students in Daqing，which increaseds with age. The growth rate of caries in female is higher than in male. Dental caries filling rate is low.

Key words: caries, rates of dental caries, DMFT, caries filling rate

摘要： 目的    了解大庆市12岁学生龋病患病情况及发展趋势，为大庆市口腔卫生保健工作及龋病的防治工作提供科学依据。方法    于2010年12月至2011年12月对大庆市所属的5个行政区，每个区1所中学，每所中学2个班级，采用分层、等容量、整群随机抽样的方法抽取510名12岁学生，进行连续2年的龋病流行病学调查，并对结果进行统计分析。结果    大庆市12岁学生2年患龋率分别为 27.06%和32.11%，患龋率比较差异无统计学意义（P＞0.05）；龋齿充填率分别为9.5%和15.1%，差异有统计学意义（P＜0.05）；2010年和2011年龋均分别为0.58 和0.68，差异无统计学意义（P＞0.05）。2010年男女患龋率分别为21.43%和30.43%，差异有统计学意义（P＜0.05）；2011年男女患龋率分别23.33和39.19%，差异亦有统计学意义（P＜0.005）；2年男性患龋率分别为21.4,3%和23.33%，差异无统计学意义（P＞0.5）；女性患龋率分别为30.43%和39.19%，差异有统计学意义（P＜0.025）。结论    大庆市12岁学生患龋率不高，随年龄的增长成上升趋势；女性患龋率增长的速度大于男性。龋齿充填率低。

关键词: 龋病, 患龋率, 龋均, 龋病充填率