[Study of dental caries prevalence in children of Yinchuan in China].
To assess the dental caries prevalence of children in Yinchuan. The 3-, 5-, 12-, 15-year-old children were chosed from nursery, primary and middle schools of Yinchuan in 1990, 1996 and 2001. The survey was carried out by five senior dentists from stomatologic hospital of Yinchuan according WHO criteria. DMFT, DMFS and the ratio of tooth filled were counted. From 1990 to 2001, the prevalence of dental caries of 3-, 5-, 12-year-old children was degression (P < 0.01). But the prevalence of dental caries of 15-year-old children had no obvious change. The dental caries of small proportion of children were serious. The ratio of tooth filling was low. With the development of oral health education, the prevalence of dental caries of 3-, 5-, 12-year-old children in Yinchuan is descend. But the diagnosis, prevention and treatment should be strengthened, and the ratio of tooth filling should be increased.