The effect of resin infiltration vs. fluoride varnish in enhancing enamel surface conditions after interproximal reduction.

To assess the effect of resin infiltration vs. fluoride varnish in enhancing enamel surface conditions after interproximal reduction (IPR). After IPR procedures, 84 human enamel specimens were divided into three groups, group A/ group B was treated by fluoride varnish/resin infiltration according to the manufacturers' instructions, group C were treated with nothing. All the specimens were pH-cycled twice daily in 37°C bath for 30 days. Surface micro-hardness, density and mineral loss were measured before and after the pH cycling. The data were analyzed and compared using ANOVA. Both treatments A and B increased the surface microhardness of enamel after IPR (p<0.05). Both before and after pH cycling, the surface microhardness of A was significantly harder than B. The density of A was higher than B before pH cycling (p<0.05). Fluoride varnish and resin infiltration may provide an enamel protection from acid challenge.