Salivary pellicle modification with polyphenol-rich teas and
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A study was conducted to investigate the modification of the salivary pellicle with different polyphenol-rich teas and natural extracts for the protection against dental erosion.

Researchers performed two experiments: one with tea (Green tea, Black tea, Peppermint tea, Rosehip tea, negative control) and the other with natural extracts (Grapeseed, Grapefruit seed, Cranberry, Propolis, negative control), where negative control was deionized water. A total of 150 enamel specimens were used. Both experiments followed the same design, consisting of 5 cycles of salivary pellicle formation (30?min, 37?°C), modification with the solutions (30?min, 25?°C), further salivary pellicle formation (60?min, 37?°C), and erosive challenge (1?min, 1% citric acid, pH 3.6). Relative surface microhardness, relative surface reflection intensity, and amount of calcium release (CaR) were evaluated.

Regarding teas, Black and Green teas showed the best protection against dental erosion, presenting higher Relative surface microhardness and lower calcium release than the negative control. Peppermint tea was not different from negative control and Rosehip tea caused erosion, showing the highest calcium release and the greatest loss of SMH and SRI. Regarding natural extracts, Grapeseed and Grapefruit seed extracts presented the best protective effect, with significantly higher Relative surface microhardness and lower calcium release. Cranberry caused significantly more demineralization, and Propolis did not differ from the negative control.

Green tea, Black tea, Grape seed extract, and Grapefruit seed extract were able to modify the salivary pellicle and improve its protective effect against enamel erosion, but Rosehip tea and Cranberry extract caused erosion. researchers show that some bio-products, like teas and natural extracts, improve the protective effect of the salivary pellicle against enamel erosion. More studies should be performed in order to test the viability of their use as active ingredients for oral care products.