engleski

Energy dispersive X-ray analysis of the elemental composition of the enamel surface

The exact mechanism of the action of fluoride in caries prevention has not been completely understood. Topical fluoride treatment of enamel mainly induces alkali-soluble fluoride described as a calcium fluoride or calcium fluoride- like material. In the present in vitro study a scanning electron microscope (SEM) was used to examine the possible morphological changes on the enamel surfaces after topical applications of amine fluoride solution with different fluoride content. To determine the elemental composition of the surface deposits the energy dispersive X-ray (EDX) qualitative analysis was use. Enamel slabs (4x5 mm2^ ) were cut from extracted third molars and randomly distributed into four groups. Three groups of slabs were each immersed for 3 min. In an amine fluoride solution ( pH 3.8) with one of following fluoride contents (1,0.5 and 0.25 percent F). These treatments were repeated for three days. One group was not treated and served as control. The morphologic appearance of the enamel surface in SEM revealed the presence of globular, crystalline and amorphous precipitates in all treated specimens and distinct difference between the treated and control groups. The impression was that the distribution of the precipitates was more homogenous in groups treated with higher fluoride concentrations. The EDX qualitative analysis indicated the presence of calcium, fluor, phosphorus and oxygen signals. The intensities of the fluoride signals were similar in groups treated with higher fluoride concentration. The intensities of calcium signals decrease in correlation with the topographic position of globules. If calcium fluoride –like material is responsible for cariostatic effect, it seems that sufficient amount of that material could provide a half strength of a standard amine fluoride solution

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