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Effect of fluoride retention in dental enamel treated using mouthrinses and topically applied solutions






Shika Igaku 49(4): 417-444

Effect of fluoride retention in dental enamel treated using mouthrinses and topically applied solutions

This study demonstrated that there was an increase in fluoride retention in bovine enamel when it was soaked in a fluoride mouth rinse following topical application of a fluoride solution. Phosphoric acidified NaF solutions (F 50, 100 and 500 ppm: pH 4.0) were used as the mouth rinses and APF (F 9000 ppm: pH 3.6) as the topically applied solution. Intact and powdered (150 mesh pass) bovine enamel had been soaked in APF for 4 min, washed with distilled water, and treated once a day with NaF for 1 min. Intact bovine enamel was exposed to 1 M KOH for 24 hours to measure its alkali soluble and alkali insoluble fluoride contents separately. The crystallinity of the powdered enamel was observed using X-ray diffractometry. The acid solubility test was used to determine the calcium released from the powdered enamel into the 0.2 M acetate buffer. When intact enamel was treated with only APF, most of the incorporated fluoride was soluble in alkali and released from the enamel within 1 week. In the case of the combined treatment with APF and NaF, the alkali insoluble fluoride content of the enamel increased and the release of fluoride was significantly suppressed. The crystallinity and the acid resistance of the powdered enamel after combined treatment with APF and NaF were higher than after individual treatment with APF and NaF. The fluoride concentration of NaF in the case of combined treatment had little influence on these effects. From these findings, it is expected that rinsing the mouth with a dilute fluoride solution after topical fluoride application could be effective in preventing dental caries.

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Accession: 005239574



Related references

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