Effects of Protective Surface Coating on Fluoride Release and Recharge of Recent Uncoated High-Viscosity Glass Ionomer Cement.

The ability to release and recharge fluoride is a property of glass ionomer cement materials, which is an advantage for patients with a high caries risk. The purpose of this study was to evaluate the amount of released and recharged fluoride in recent uncoated high-viscosity glass ionomer cement (Ketac TM Universal Aplicap TM ) with different surface coatings and at different time points. In total, 135 cylindrical-shaped specimens were equally divided into the following three groups: Ketac TM Universal Aplicap TM , Ketac TM Molar Aplicap TM , and Ketac TM Fil Plus Aplicap TM . The different coatings performed on each group were as follows: uncoated, coated with Ketac TM Glaze, and coated with G-Coat Plus TM . The amounts of released and recharged fluoride were measured at 24 h and at weeks 1, 2, 3, and 4. The recharging agent was a 1.23% APF gel. Ketac TM Universal Aplicap TM showed the highest released fluoride at all time points and the highest recharged fluoride at weeks 1, 2, and 3. Both the Ketac TM Glaze- and G-Coat Plus TM -coated specimens presented significantly lower released and recharged fluoride ions than the uncoated group at all time points ( p < 0.001). Coating with G-Coat Plus TM significantly decreased the released and recharged fluoride compared to the coating with Ketac TM Glaze at almost all time points ( p < 0.05), except for weeks 1 and 2. The application of coating agents reduced the amount of released and recharged fluoride by the Ketac TM Universal Aplicap TM .