%0 PDF %T Fluoride Release, pH change and Recharge Ability of Different Types of Glass Ionomer Restorative Materials: A Comparative In-Vitro Study. %A Asali, Ammar. %8 2017-04-14 %R http://localhost/files/h702qk07b %X Abstract: Purpose: The aim of this in-vitro study was to evaluate and compare fluoride release, levels and change in pH, and recharge ability of four types of glass ionomer restorative materials at one day, seven days, 15 days, 16 days, and 30 days. Materials and Methods: Samples were prepared from Fuji IX, Photac Fil, Riva LC and Activa Bioactive restorative. Each specimen was immersed in 5 mL of artificial saliva for 24 hours to be measured for fluoride release and pH level. Samples were then transferred to new containers to be measured again at 7 days and 15 days. After the 15th day reading, samples were recharged using 5% sodium fluoride varnish. Fluoride release and pH levels were assessed again at the 16th day and 30th day. Results: All materials, except Fuji IX, scored highest at day 1 then decreased gradually at day 7 only to increase at day 15. Fuji IX showed the highest scores until the day of recharging and decreased gradually from day 1 to 15. Fuji IX and Activa showed similarly the highest scores at day 16 (1 day post recharging with NaF). Activa was significantly highest at day 30 followed by Riva and Fuji IX showing comparable amounts. pH levels showed instability and exhibited median values between 4.65 and 5.95. Conclusion: Within the limitations of this in-vitro study, we can conclude that when tested in artificial saliva, Fuji IX had the highest scores of fluoride release. Activa exhibited the highest recharge ability at day 30. pH levels fluctuated and avoided potentially destructive levels throughout most of the study's duration.; Thesis (M.S.)--Tufts University, 2016.; Submitted to the School of Dental Medicine.; Advisor: Cheen Loo.; Committee: Matthew Finkelman, and Mohamed Hassan.; Keyword: Dentistry. %[ 2022-10-12 %~ Tufts Digital Library %W Institution