Fluoride release from four reinforced composite resins; a one year study

Four fluoridated composite resins were described and separated into four groups. Two composite resins were high viscosity core materials Ti-Core (Group 1) and Ti-Core Natural (Group 2) and two were low viscosity core materials Flexi-Flow Cement with titanium (Group 3) and Flexi-Flow Natural (Group 4).This study recorded the fluoride release measured in parts per million in deionized water for each of four fluoridated composite resins for one year.Repeated measures analysis of variance (RMANOVA) was computed to separately analyze interval release and cumulative release over time and between groups. One-way analysis of variance (ANOVA) (P0.0001) was selected to compare average weekly release between the four groups. The student-Newman-Keuls (SNK) test revealed that the mean weekly release was similar for both Flexi-Flow Natural and Flexi-Flow with titanium.The Ti-Core systems of groups 1 and 2 were both different from the Flexi-Flow systems and different from each other. Ti-Core with titanium Group 1 yielded the greatest fluoride release over a 52-week period, followed closely by Ti-Core Natural of Group 2. The fluoride released for these systems in Groups 1-4 was similar to the ranges reported in other fluoridated dental cements and composite resins.