Abstract
We performed dental examinations on children in the kindergarten attached to Shanghai Teachers'University in Shanghai, China strating in 1996 using oral examination charts, intra-oral photographs, and dental casts obtained from 334 children aged 3 to 5 years in 1996 and 1999.
1. The caries incidence ratio was highest in children aged 3 and 4 years.
2. The caries incidence ratio of teeth and the mean per-child dft indices were slightly lower in 1999than in 1996.
3. The ratio of filled teeth rate was slightly higher in 1999 than in 1996.
4. The incidence of gingivitis was markedly lower in 1999 than in 1996.
5. Regarding malocclusion, the incidence of anterior cross-bite was slightly higher in 1999 than in 1996.
6. Regarding abnormal teeth, the incidence of black extrinsic tooth stain was slightly lower in 1999than in 1996.
