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Fluoride varnishes have proven to prevent dental decay. Alternative prepa-rations that provide further benefits may be of interest to investigate. Aim of the study: was to compare the anticariogenic effect of Nano Silver Fluoride (NSF) with fluoride varnish (FV) on primary teeth enamel. Materials and method: Forty eight sound primary molars were coated with nail varnish, leaving squares of 4x4 mm then sectioned longitudinally in a buccolingual direction into two equal halves. One half received a treatment and the other half remained untreated to serve as control. Each half was considered as a specimen (96 specimens). The NSF group (n=48) was subdivided into subgroup Ia (n=24) treated with NSF and subgroup Ib (n=24) served as negative control, the FV group (n=48) was subdivided into subgroup IIa (n=24) treated with FV and subgroup IIb (n=24) served as negative control. Specimens were subjected to pH cycling then they were examined with Vickers Microhardness device and Polarized Light Microscope. Results: Percent difference in surface microhardness of subgroup Ia and subgroup Ib was 3.79±2.13, while the percent difference between subgroups IIa and IIb was 5.40±3.79. Using Mann Whitney U test, there was no statistically significant difference between the two values (P=0.81). The percent differences in lesion depth for subgroup Ia in comparison to Ib, and IIa in comparison to IIb were -36.36±9.54 and -37.30±16.67 respectively. The difference between both values was non-significant (P=0.86). Conclusion: NSF and FV are equally effective as anticariogenic materials that can limit enamel demineralization caused by cariogenic challenge.

EVALUATION OF THE ANTICARIOGENIC EFFECT OF NANO SILVER FLUORIDE ON DEMINERALIZATION OF ENAMEL IN PRIMARY TEETH (AN IN VITRO STUDY)