¹ UNIVERSITy ST. KIRIL AND METODIJ, fACULTy Of DENTISTRy, CLINIC Of pEDIATRIC AND pREVENTIVE DENTISTRy, SKOpLJE, MACEDONIA;
² UNIVERSITy Of NIS, fACULTy Of MEDICINE, pREVENTIVE AND pEDIATRIC DENTISTRy, CLINIC OF DENTIsTRy, NIs, sERBIA

Introduction. Decaltification on the teeth around the orthodontic braces can be reduced with adequate oral hygiene and use of fluorides.
Aim. The aim of this study was to examine, using scanning electron microscopy, the ultrastructural changes on enamel surface after the treatment with different fluoride preparations.
Methods. Orthodontic braces were placed on 30 dental samples (premolars) extracted for orthodontic reasons and orthodontic braces fixed with Fuji Ortho LC. The teeth were divided into three groups with 10 teeth each. First group was the control one, without treatment with fluoride solutions. Second group consisted of teeth samples treated with
Fluorogal (0.05% F), every day for 1 minute in the period of 6 months. Third group consisted of teeth samples treated 5 minutes daily with GC Tooth Mousse in the period of 6 months. The teeth were placed in artificial saliva in the period of 6 months. Afterwards, the samples were prepared for scanning electron microscopy, SEM (JEOL JSM 5300) using the technique of sputtering in a vacuum evaporator. Enamel surface was analyzed in order to identify micromorphologic structural changes on the places where braces had been previously fixated.
Results. The results indicated that SEM analysis detected the highest remineralization potential in the tooth samples exposed daily to low doses of fluoride.
Conclusion. Remineralization of demineralized enamel was present in both experimental groups of teeth, being more intense in the group treated with Fluorogal solution.

Key words: enamel, brace, demineralization, remineralization