Effects of surface pre-reacted glass particles on fluoride release of dental restorative materials

Objectives: The objective of this study was to evaluate the effects of added surface pre-reacted glass particles on fluoride release pattern of dental restorative materials. Methods: Six disk shape samples (6×2 mm) of each material were prepared using standard moulds. Cured samples were removed from the moulds carefully and were incubated at 37°C for 24 hours in airtight containers. All samples were incubated at 37°C in 15 ml of de-ionized water. Fluoride release was measured using Ion Selective Electrode (Thermo-Orion Ionplus) for up to 28 days. Fluoride concentration in standard solutions and elution media was measured and calculated as parts per million (PPM). The data was analyzed statistically using 2 way ANOVA. Results: Two distinct stages of fluoride release, initial burst fluoride and later sustained release were observed in all materials. For Fuji II™ LC, release significantly higher amount of fluoride in to the elution media during any day compared to Beautiful. Sustained fluoride release was observed in both materials up to 28 days. Conclusions: Both materials (Beautifil® and Fuji II™ LC) used in this study showed the similar pattern of fluoride release, i.e. first initial burst release of fluoride followed by sustained release of fluoride for four weeks.