Evaluation of fluoride release from three different Glass-ionomer luting cements at different time intervals

The fluoride released in oral cavity plays an effective role in preventing carries in lateral walls of the restoration cavities and remineralization of initial lesions. Dental materials are considerably different regarding the amount of fluoride release. This study aimed to determine the amount of fluoride release from three self-cure glass ionomer cements, Fuji I, Fuji Plus and SDS in distilled water. In this experimental study, 8 disc-shape specimens (3×10mm) were prepared from three glass ionomers, Fuji I and Fuji Plus (CG, Japan) and SDS (Iran). Eight specimens of each material were placed in 7ml of distilled water and were stores in incubator at 37oC. The amount of fluoride release was measure at 1, 3, 7, 14, 28 and 56 days using a fluoride ion-specific electrode (Metrohm, Switzerland). Data were analyzed using repeated measurement ANOVA and LSD tests. The pattern of fluoride release was similar for the three materials. The amount of released fluoride from the three material in day 1 was considerably greater than the other days (Fuji I=28.07±0.26, Fuji Plus=35.97±0.19, SDS=41.08±0.36), followed by a gradual decrease over the study period. The least amount of fluoride release was recorded on day 56. The difference between the amount of fluoride release from the three glass ionomers was statistically significant (P=0.0001). In addition to revealing a statistically significant difference between the three glass ionomers in terms of fluoride release, the results of this study suggests using SDS glass ionomer in patients susceptible to caries.