Comparison of Fluoride Control Release from Glass Ionomer Type I, - usied in orthodontics Banding - before and after exposing to Acidic and Neutral solution of NaF ۰.۲%

Aim: Enamel decalcification during orthodontics treatment is a serious clinical problem. Glass Ionomer is a hydrophilic compound that is able to release fluoride. Hence we assessed the amount of fluoride release from Glass lonorner type I (use in orthodontics banding) following refluoridisation in acidic and nutraI solution of NaF ۰.۲%.Materials arid Methods: In this experimental research, we chose Type I Glass Ionomer Cement which was built in Ariadent Factory, ۳۰ disc shape compound in stainless steel casts with ۶ mm diameter and ۲ mm height according to manufacturer structure was prepared. Each sample floated in ۵cc acidic and nutral ۰.۲% NaF solution and distillated water. We assessed the amount of fluoride in solutions by potentiometer method in ۱st, ۸th, ۱۵th, ۲۲nd and ۲۹th and reported in ppm scale. Results: Maximum Fluoride releasing from the samples existing in the distillated water was in ۸th day that descended during the first month, but maximum fluoride absorption in samples in acidic NaF solution was in first day that descended during the first month and maximum fluoride absorption in samples in nutral NaF solution was in ۸th day that descended during the first month.Conclusion: Glass Ionomer cement can act as a chargeable fluoride releasing and absorption system also daily using acidic compound consisted of fluoride decrease surface hardness of glass ionomer. The amount of fluoride releasing and absorption of glass ionomer decrease rapidly in acidic solution that is not proper for long orthodontics treatments. 

کلیدواژه ها:

Absorption ، Flouride release ، Reflouridisation