Abstract:

Objective: To observe the surface of artificial caries that treated by different concentration of raw and ripe Pu'er tea
aqueous extracts for providing a theoretical basis for the research and development of natural anti- caries drug. Methods:
Demineralizated enamel cultured by chemical reagents was used as model. With water as the extract, raw and ripe tea with 96，48，24，
12，6 mg/mL were used as test solution. 20 mg/mL NaF as the positive control group and deionized water as the negative control group
were divided into 12 groups and observed by scanning electron microscopy after pH extracorporeal circulation. Results: With the
increasing concentration of raw and ripe tea, the sediments on enamel surface were more uniform and compact and a large number of
regular crystallization generated when the concentration reached up to 96 mg/mL, and ripe tea group had more and thicker sediments
than raw tea; NaF group also had a lot of sediments, but was not compact; deionized water group only had a few sparse sediments with
uneven surface, and had little difference after demineralization. Conclusion: Raw and ripe Pu'er tea aqueous extract had the
remineralization effect on artificial demineralized enamel, but the low concentration was ineffective.