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Topical fluoride and glass ionomer microhardness
A M Díaz-Arnold1, D W Wistrom, E J Swift
1Department of Family Dentistry, College of Dentistry, Univeristy of Iowwa City, IA 52243, USA.
Purpose:
To evaluate the effect of topical fluoride gels on the microhardness of three glass ionomer cements.
Materials And Methods:
Cylinders of Ketac-Silver, Photac-Fil, and Fuji II LC were fabricated, stored in distilled water at 37 degrees C for 48 hours, and exposed to a neutral sodium fluoride gel (Karigel-N), and acidulated orthophosphoric acid gel (Karigel), and a stannous fluoride gel (Omni) at 37 degrees C for 36 hours. Knoop hardness was then recorded.
Results:
Statistical analysis showed significant differences (P<0.01) between groups related to material and treatment Ketac-Silver did not demonstrate significant differences in hardness, whereas exposure to APF decreased the Knoop hardness of Fuji II LC and Photac-Fil.