Abstract
Objective: To evaluate the acidulated dentifrice influence on fluoride releasing from glass-ionomer cements. Methods: 27 specimens were constructed, divided into 3 groups: G1 (Maxion - R), G2 (Ketac Molar 3M/ESPE) and G3 (Vittremer 3M/ESPE), and subdivided into 3 subgroups (n = 3): A (exposure to acidulated fluoride dentifrice – pH 4.5 / 7h / 37 oC), B (exposure to non-acidulated fluoride dentifrice / 7h / 37 oC), C (control - exposure to artificial saliva). After exposing, the specimens were immersed into artificial saliva and the fluoride releasing measured at the following time periods: 1 to 14 days. Data were subjected to analysis of variance using the Statistical Package for Social Science (SPSS). ANOVA test was applied with level of significance of 5% to compare the means and the behavior of each material. Results: The exposure to acidulated dentifrice showed fluoride releasing means values (ppm/mm2) that varied from 1 and 14 days : G1A (0.269 to 0.204); G2A (0.394 to 0.038); G3A (0.080 to 0.123). The relationship among the G1 subgroups at T1 and G3 subgroups at T1 and T14 was statistically significant. Conclusion: The acidulated dentifrice positively influenced on fluoride releasing of hybrid GIC but not on that of conventional GICs.Keywords: Glass-ionomer cement; Fluoride releasing; Acidulated dentifrice.
Highlights
Fluoride is a successfully preventive/ therapeutic agent mostly impacting on both the people’s health and quality of life [1]
Fluoride is a gas; in Dentistry, fluoride prevents caries by reducing hydroxyapatite solubility, balancing the demineralization/ remineralization rate, and stabilizing the crystalline structures of the enamel which become more resistant to the acid challenges from bacteria
Fluoride releasing from restorative materials may affect the development of caries lesions through mechanisms that reduce or prevent demineralization [6,7]
Summary
Fluoride is a successfully preventive/ therapeutic agent mostly impacting on both the people’s health and quality of life [1]. Fluoride is a gas; in Dentistry, fluoride prevents caries by reducing hydroxyapatite solubility, balancing the demineralization/ remineralization rate, and stabilizing the crystalline structures of the enamel which become more resistant to the acid challenges from bacteria. The rationale behind the anticaries effect of fluoride is the interference with the bacterial metabolism [2,3,5,6]. Fluoride releasing from restorative materials may affect the development of caries lesions through mechanisms that reduce or prevent demineralization [6,7]. Either conventional or resin-modified (hybrid) glass ionomer cements (GICs) demonstrated greater fluoride releasing capacity. Because of the slowest GIC setting reaction, a greater active ion displacement (including fluoride) occurs at the initial phases of gelation, mainly at the first 24 h
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