Liberación de fluoruro de dos cementos de ionómero de vidrio: estudio in vitro

Abstract

Objective: The aim of the present study was to compare the amount of fluoride released by two glass-ionomer cements: Ketac Molar Easymix® (3M ESPE), which has recently appeared in the market and offers the additional advantage of easy mixing, and FUJI II® (GC Dental Industrial Corporation), which has been for a longer time available in the market. MethodsBoth materials were handled according to the manufacturer’s instructions. 15 samples were made of each glass ionomer cement using sample molds which measured 4mm diameter x 6mm height. Glass ionomer cement was placed into the molds and then pressed. Samples were introduced in an oven (37 ± 1 °C at 90% relative humidity). After one hour had elapsed, samples were withdrawn from the oven and then individually immersed in 1mL deionized water in a hermetically sealed plastic container, to be later stored in a chamber at 37 ± 1 °C. After 24 hours, samples were removed from the chamber and withdrawn from the storing solution, they were then rinsed with de-ionized water and excess water was removed with blotting paper. Samples were then transferred to another container adding 1mL de-ionized water in order to be placed in the oven under the same conditions. Total ionic strength adjustment buffer solution was incorporated into the storing solution for it to be read with the help of a potentiometer (pH-meter) and a fluoride selective electrode for fluoride under magnetic agitation. Prior to conducting fluoride measurements, solutions were prepared in different concentrations in order to establish the calibration curve. The same procedure was performed in the aforementioned manner during the 36 days which the study lasted. Results: Both cements released fluoride. For both cements, highest release was observed during the first 24 hours. Release declined during the second day and kept gradually decreasing with time. Results were statistically analyzed using the Mann-Whitney test. No statistically significant differences were observed. ConclusionsBoth glass ionomer cements exhibited similar fluoride release. Glass ionomer cement are ideal for use in preventive dentistry as well as in atraumatic restorative technique