Aging influence on roughness and color stability of encapsulated glass ionomer cements
Objective: To analyze effects of differents agings on the roughness and color of different encapsulated glass ionomer cements (GIC). Materials and methods: Two glass ionomer cements (Conventional/Self Cure (SC) and modified resin/Light Cure (LC)) and three aging (baseline, post-thermal cycling and post-thermal cycling + storage for 7 months). Fifty-two discs (n = 13) were made. The color stability was performed with spectrophotometers (VITA Easyshade and Konica Minolta CE3700A), and the roughness test with optical profilometer (Proscan 2100, Scantron). Results: The data were analyzed with two-way ANOVA and Tukey’s test (p < 0.05). The GICs presented statistically significancy when compared (p < 0.05), for roughness (SC = 0,202μm e LC = 0,241), the aging protocols tested promoted a significant change in surface roughness baseline = 0,278μm, post-cycling = 0,220μm and storage = 0,167μm and for the color (SC ΔE = 3,89 and LC ΔE = 4,94). However, the interaction between the factors was not statistically significant (p > 0.05). For ΔL*, Δa*, Δb*, there was a difference in the interaction of the factors, with a greater change in ΔL* for the GIC LC post-thermal cycling + storage). For Δa* there was a statistically significant difference (p < 0.05) between aging, being the higher alteration for the GIC LC group post-thermal cycling. Greater change in the b* coordinate was observed for the GIC LC post-thermal cycling + storage. Conclusions: The different GICs presented different surface roughness and color. The resin-modified GIC LC showed to be rougher when compared to the conventional GIC SC. However, both GICs became less rough over time. The post-thermal cycling + storage for 7 months was the aging protocol that most interfered in the roughness and color of different types of GICs.
Copyright (c) 2019 Adriana Bona Matos, Bruno Bachiega da Silva, Erika Michele dos Santos Araújo, Beatriz Togoro Ferreira da Silva
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