Fluoride release and recharge of enhanced resin modified glass ionomer at different time intervals

Aim

To investigate the fluoride release and recharge from two fluoride releasing materials at different time intervals.

Materials and methods

Sixty specimens were prepared then equally divided into 12 groups (n = 5/group), representing materials used; one resin modified glass ionomer restoration (RMGI); Fuji II LC and one enhanced RMGI; ACTIVA Bioactive-Restorative. Each material was evaluated for its fluoride release before and after fluoride recharge using a topical fluoride recharging gel at 1, 2, 7, 14, 21 and 28 days.

Results

There was a statistical significant difference between different tested time intervals regarding fluoride release before and after fluoride recharge for both tested materials, where (p ≤ 0.001). The highest mean value of fluoride release was in (Day-1), and the least mean value of fluoride release was in (Day-28). There was no statistical significant difference between both materials at each time interval regarding fluoride release before recharge. While after fluoride recharge; RMGI (Fuji II LC) showed higher fluoride release mean values compared to the enhanced RMGI (ACTIVA) at each time interval (1, 2, 7, 14, 21, 28 days).

Conclusion

RMGI and enhanced RMGI, showed the same pattern of fluoride release in deionized water, but RMGI was more successful to be recharged.