关键词: 纳米含氟高强度树脂, 玻璃离子水门汀, 光固化复合树脂, 含氟制剂, 氟释放, 再吸收

Abstract:

Objective To measure the fluoride releasing and recharging abilities of Nano fluorine-containing high strength composite, and to find the most effective fluoride recharging method in vitro experiments. Methods Three experimental groups containing three kinds of Nano fluorine-containing high strength composites(10%, 20%, 30%) were set up and the glass ionomer cement(GIC, Fuji Ⅸ) was considered as positive control group.These materials were made into special style(5 mm diameter and 2 mm depth) and then were placed into deionized water (DW).The initial fluoride ion release of five samples which were randomly selected from each group was measured every day using a fluoride-ion specific electrode, and the process lasted for one month.Then non-fluoride-releasing composites(Tetric N-Ceram, Universal type, Neofil, Spectrum TPH) were considered as negative control group, and were also prepared respectively for 18 samples.Each specimen of the eight restorative materials was subjected to six different treatments to simulate a fluoride recharge:Duraphat, FLUORX Fluor Protector, Copal Fluoride Varnish, Fluoride Foam Type A, Fluoride Foam Type C, 1%NaF solution.After topical fluoride treatment, each specimen was submitted to fluoride release tests.The data were analyzed using ANOVA. Results During the initial period for each group, the fluoride release was peaked at the first day, decreased rapidly at the second day, and then kept relatively stable at the 5th-30th day.The overall cumulative amount of fluoride release: FujiⅨ > 30% fluoride-containing composite > 20% fluoride-containing composite > 10% fluoride-containing composite.The difference was significant (P<0.05) among each group expect the 10% and 20% fluoride-containing composites.After topical fluoride treatment, the amount of fluoride ion release of FujiⅨ was higher than the other composites(P<0.01).The amount of fluoride ion release of 30% fluoride-containing composite was higher than the other non-fluoride-releasing composites(P<0.05).The overall cumulative fluoride ion release after Fluoride Foam Type A treatment was higher than other treatments(P<0.05). Conclusion Nano fluorine-containing high strength composite has the potential for releasing and recharging fluoride and the ability of fluoride ion releasing and recharging for 30% fluoride-containing composite is the most strongest.In addition, Fluoride Foam Type A is more effective in recharging fluoride than the others.

Key words: Nano fluorine-containing high strength composite, glass ionomer cement, light cure composite, fluoride preparations, fluoride release, fluoride recharge