Sub ppm levels of fluoride in saliva are effective in shifting the balance from demineralization to remineralization of tooth at the tooth/oral fluid interface. Fluoride containing alginate impression materials have been shown to exert a considerable reduction in enamel solubility. Objectives: The objective of this study was to evaluate the effects of fluoride incorporation into the experimental dental alginate impression materials on the fluoride release, mechanical properties, and setting time. Methods: Four compositions of alginate impression materials were experimentally prepared. After then five groups of materials depending on the fluoride content were tested. Materials were mixed with distilled water (control group; 1) or 100-ppm fluoride solution (2). 1 or 2% NaF (3, 4) or 1% SnF₂ (5) was incorporated into the materials. The fluoride-containing materials were mixed with distilled water. Fluoride release, compressive strength, elastic modulus, flexibility, recovery from deformation and setting time were determined in accordance with the ADA Spec. 18 and ISO 1563. Results: Fluoride release was increased after incorporation of fluoride into water or materials, and the released amount was 4.08-17.19 ppm. NaF or SnF₂ incorporation resulted in higher fluoride release than the control group (p<0.05). Compressive strength (CS) after incorporation of fluoride was 0.36-1.12 MPa, and these values were in accordance with the ADA Specification (>0.35 MPa). Incorporation of 2% NaF reduced the CS and elastic modulus (p<0.05) compared with the control group. Flexibility was 14.12-26.76%, and the addition of 2% NaF increased flexibility (p<0.05). Addition of fluoride generally decreased initial setting time. Conclusions: Incorporation of NaF or SnF₂ into alginate impression materials may be efficient in releasing fluoride without having any deleterious effects on the properties of material. Supported by the Korea Health 21 R&D Project, Ministry of Health and Welfare, Republic of Korea.

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