Abstract The subjects of the study were 71 children from 1 to 5 years of age during the primary dentition period. The Cariostat test(CAT 21 test) was examine before the caries treatment and after. The effect was taken from the results based on caries treatment, and was investigated.
1. Before the treatment, the mean d-teeth were 6.13, the mean df-teeth were 7.68, the mean CSI score was 18.4. After the treatment, the mean d-teeth were 0, the mean df-teeth were 7.68, and the mean CSI score were 9.73.
2. Before the treatment,35.2% the CAT score was 2.5 or higher,32.4% the CAT score was 2.0, There was no instance of 0.5 or lower in the CAT score.
3. After the treatment,29.6% the CAT score was 1.0,26.8% the CAT score was 1.5, however,0.5the CAT score increased 9.8%.
4. After the treatment,88% children showed improvement at CAT 2.5 or higher before the treatment, and 60.9% children showed improvement at CAT 2.0.
5. The CAT scores before the treatment highly correlated with all of the caries score(p<0.001). However, after the treatment, no correlation was found between them.
This study suggested that it is important to keep low caries activity in order to prevent new caries based on a periodic recall system after the dental treatment.