Effects of a bleaching agent on properties of commercial glass-ionomer cements
de Camargo Fernanda Lucia Lago, Lancellotti Ailla Carla, de Lima Adriano Fonseca, Martins Vinicius Rangel Geraldo, de Souza Goncalves Luciano,
소속 상세정보
( de Camargo Fernanda Lucia Lago ) - Integrated School of Carajas School of Dentistry Department of Restorative Dentistry
( Lancellotti Ailla Carla ) - Piracicaba Dental School Department of Restorative Dentistry
( de Lima Adriano Fonseca ) - Paulista University School of Dentistry Department of Restorative Dentistry
( Martins Vinicius Rangel Geraldo ) - Uberaba University School of Dentistry Department of Restorative Dentistry
( de Souza Goncalves Luciano ) - Federal University of Rio Grande do Sul School of Dentistry Department of Conservative Dentistry
Abstract
Objectives: This study evaluated the effects of a bleaching agent on the composition, mechanical properties, and surface topography of 6 conventional glass-ionomer cements (GICs) and one resin-modified GIC.
Materials and Methods: For 3 days, the specimens were subjected to three 20-minute applications of a 37% H2O2-based bleaching agent and evaluated for water uptake (WTK), weight loss (WL), compressive strength (CS), and Knoop hardness number (KHN). Changes in surface topography and chemical element distribution were also analyzed by energy-dispersive X-ray spectroscopy and scanning electron microscopy. For statistical evaluation, the Kruskal-Wallis and Wilcoxon paired tests (α = 0.05) were used to evaluate WTK and WL. CS specimens were subjected to 2-way analysis of variance (ANOVA) and the Tukey post hoc test (α = 0.05), and KH was evaluated by one-way ANOVA, the Holm-Sidak post hoc test (α = 0.05), and the t-test for independent samples (α = 0.05).
Results: The bleaching agent increased the WTK of Maxxion R, but did not affect the WL of any GICs. It had various effects on the CS, KHN, surface topography, and the chemical element distribution of the GICs.
Conclusions: The bleaching agent with 37% H2O2 affected the mechanical and surface properties of GICs. The extent of the changes seemed to be dependent on exposure time and cement composition.
키워드
Dental materials; Glass-ionomer cement; Tooth whitening agents
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