Objective:To observe and compare the fluorine release of different fluor protectors in artificial saliva.Methods:A thin coating on one side of a polyester sheet (20mm×40mm) with fluor protector

then was painted each sheet of polyester with the fluor protector was placed coating into a polystyrene vial and added 20ml of artificial saliva

and the fluor protector coating became completely immersed in the solution of homeothermia

37℃ at 1

3

7

31

55

124 and 213 hours after immersion.The fresh solution replaced the older one for fluoride determination with a fluoride-specific ion electrode and a acidimeter.Results:Two different concentrations of fluor protectors released certain amount of fluorine through the nine days period.With the elongation of immersed hours

their fluorine release decreased gradually.There was no significant difference between two different concentrations of fluor protectors as to fluorine release in artificial saliva( P >0.05).But there were significant differences among various time period in each group( P <0.05).Conclusion:The study indicates that the fluor protector could release fluorine slowly during the fixed time.There is no significant difference between two different concentrations of fluor protectors in fluorine release effect.