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Background: When reviewing the topic of materials containing fluoride acrylic resin, we found differences in fluoride release in addition to the improvement of the physical properties of acrylic materials. Aim: The aim of this study was to evaluate the effect of adding sodium fluoride (NaF) (in different concentrations to the monomer of acrylic resin) on the porosity of denture base materials and its effect with long-term water immersion (after 4 months immersion in deionized water). Materials and methods: Eighty circle-shaped specimens measured 30 mm diameter and 3mm thickness were divided into two groups according to water immersion, 40 specimens before immersion and 40 specimens after water immersion for 4 months (the deionized water was changed every day).Each of these groups was subdivided into four groups according to the concentration of NaF. NaFpowder was added to the monomer of the acrylic in these contractions: 1% NaF,2% NaF,5% NaF,0% NaF (the control group without adding NaF),then mixed with polymer according to the manufacturer’s instructions,then conventional flasking,packing procedure were followed.The porosity was tested with a light microscope. Results and conclusion: The results showed that the addition of fluoride to acrylic resin materials increased the porosity of acrylic. All concentrations of NaF showed more porosity than the control group (with a highly significant difference p 0.05) (after immersion) betweenthe control group and the 1%NaF group.

Influence of Different Concentrations of Fluoride on The Porosity of Acrylic Resin Denture Base Materials