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Changes of acid resistance and microhardness after administration of sodium fluoride in rat tooth

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Abstract

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The wide spread use of various vehicles for systemic or topical delivery of fluoride is
undoubtedly responsible in large part for the remarkable decline in the prevalence of
dental caries that is currently being experienced in many countries of the western world.
At the present time, the most common sources of fluoride intake are fluoridated drinking
water and dental products. There is no possibility of serious acute toxicity from the
ingestion of drinking water with controlled fluoride levels. Fejerskov et a1 reported that
fluoride exerts its effect on very basic processes involved in biomineralization in general
, irrespective of whether crystal formation and growth occurs in mesenchymally or
concentration of fluorotic human inner enamel is elevated compared to normal enamel.
Richards and Fejerskov and Richards et at using the pig model , showed that inner
enamel fluoride concentration was specifically raised when fluoride was administered
during all phases of enamel development, even though fluoride could occur with fluoride
exposure during only the maturation stage of enamel development. Studies by Bronckers
et al determined the effect of fluoride on mineralization in vitro using hamster molar
tooth organ culture. They showed that fluoride in the media irreversibly affected the
existing mineralizing matrix, producing a more rapid deposition and disruption of crystal
growth. And fluoride in the media interfered with the deposition of crystal in the new
matrix. However, when fluoride was removed, the matrix recovered and mineralized
normally. The presence of even very small amounts of fluoride in a mineralizing solution
enhance the precipitation of mineral. Therefore , the greatest importance of fluoride to
the maturation process probably lies its ability to increase the rate of mineralization of
hypomineralized areas.

Å°¿öµå

³»»ê¼º; ¹Ì¼¼°æµµ; ºÒÈ­³ªÆ®·ý; Acid resistance; Microhardness; Sodium fluoride;

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