Abstract:

Objective：The paper is to study the remineralized effects on root caries of different kinds of fluoride toothpaste and
fluoride- free toothpaste contained NaF concentration10, 20 and 40 mg/L. Methods：The tissue block of artificial body root was
prepared from bovine incisor, "open window" and put them in 37 ℃ demineralization solution for 96 hours to form artificial root caries.
Six samples were randomly divided into each group. The demineralized samples were pH-cycled through for 8 days with 6 cycles per
day. The samples were evaluated by using polarized light microscope（PLM）. Results：Fluoride toothpaste group showed varying
degrees of mineral deposition, and the deposition band width order was as follow: Darlie＞Cnice＞Colgate. The deposition band width
order of fluoride-free toothpaste with NaF was as follow: 40 mg/L＞20 mg/L＞10 mg/L. Conclusion：The remineralization effect of
Darlie in fluoride toothpaste was the best, and the remineralization of fluoride-free toothpaste with 40 mg/L NaF was the best.

Key words: fluoride toothpaste, root caries, remineralization, polarized light microscope