Abstract: Abstract：　Objective: To compare the consistency, sensitivity and accuracy between a caries activity test from China and Cariostat test from Japan and to evaluate the clinical feasibility of the former one. Material and methods: Eight species of oral bacteria, including S. mutans, S. sanguinis, S. salivarius, S. sobrinus, L. acidophilus, P. gingivalis, F. nucleatum and A. viscosus, were diluted in four concentrations and cultured in these two mediums separately for 48 hours. Blank negative control was also applied. Three blind tester reported the results under same condition, which were then analyzed by SPSS 19.0. Results: The kappa value between these two tests was over 0.8. The sensibility of the test kit was 94.7%, specificity was 85.6% and accuracy was 90.4%. Conclusion: The acid-production detection technique from oral plaque selected in this study is a promising substitute for Cariostat test. Products with better accuracy, higher cost performance and easier accessibility are still needed.

Key words: caries, caries activity test, Cariostat, domestic medium