Avaliação da maturação de cimentos de ionômero de vidro quimicamente ativados com diferentes princípios ativos

Abstract

The scientific literature reports the success of the Atraumatic Restorative Treatment (ART) technique for several years of follow-up and still discusses the properties of the material used for the technique as its main disadvantage. The aim of this study was to determine the setting reaction of different glass ionomer cements (GIC) employed in the ART technique in different storage periods by the surface microhardness (SMH) analysis. Forty-eight specimens were prepared and divided into four groups according to the GIC type (n = 12): G1 - ION-Z (FGM), G2 - Ketac Molar Easymix (3M/ESPE), G3 - Riva Self Cure (SDI), and G4 - Gold Label 9 (GC). The specimens were prepared in plastic molds and stored in distilled water. After polishing, SMH (Knoop) analysis was evaluated in three phases: after one (A), three (B) and seven (C) days of storage in distilled water. Five indentations were performed in each specimen. Data were compared using two-way ANOVA test and Tukey's post test for multiple comparisons (α = 5%). The mean SMH values for phases A, B and C were, respectively, 33.05 ± 9.74; 33.21 ± 10.31 and 52.07 ± 11.75 (G1); 50.35 ± 11.39; 66.05 ± 10.48 and 67.77 ± 13.80 (G2); 89.63 ± 15.59; 71.31 ± 23.86 and 57.70 ± 16.89 (G3); 42.18 ± 9.03; 68.54 ± 6.83 and 57.95 ± 8.24 (G4). The ANOVA test showed statistically significant differences for the following parameters: GIC type (p<0.001), storage period (p=0.0141) and interaction of both (p<0.001). Tukey´s post test showed that SMH values were different between all groups, except in G2 and G4 for the parameter GIC type. In phase A, SMH values were lower than phases B and C for the parameter storaged period, except for G1 (A=B<C) and G3 (A>B =C) (p<0.05). It can be concluded that the setting reaction differs among the different types of GIC tested and the storage period in distilled water.