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Fig. 3 | BMC Oral Health

Fig. 3

From: Preventive potential of nano silver fluoride versus sodium fluoride varnish on enamel caries like lesions in primary teeth: in vitro study

Fig. 3

Polarized light photomicrograph of a longitudinal ground section of: a. Normal enamel with HSBs (black arrows) and prismless surface layer (red arrows). b. Control specimen (Ib) showing evident dark demineralized enamel band with high degree of positive birefringence (circle). c. Enamel treated with NSF (Ia) showing prominent lesion depth reduction with noticeable negative birefringence (circle) and surface mineralization (red arrows). d. Control specimen (Ib) showing demineralized enamel band (circle). e. Enamel treated with NSF (Ia) showing remarkable protection against demineralization (circle) with negative birefringent surface and remineralization band (red arrows), magnification ×40

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