Surface roughness and chemical composition changes of resin-modified glass ionomer immersed in 0.2% sodium fluoride solution

Abstract

Background/purpose Glass ionomers undergo degradation when exposed to fluoride, which changes the physico-chemical characteristics of the materials. The purpose of this study was to evaluate the surface changes of resin-modified glass ionomer (RMGI) when immersed in a sodium fluoride (NaF) solution according to pH and time. Materials and methods 120 RMGI specimens were prepared, and 30 specimens were placed in four types of storage solutions for four weeks; pH 7 artificial saliva with or without 0.2% NaF (As7 and NaF7), pH 5 artificial saliva with or without 0.2% NaF (As5 and NaF5). Interferometry and microscopy were performed to evaluate the surface roughness and topography, while spectroscopy was used to analyze the chemical composition changes. Results Rougher topography and increased roughness was exhibited in NaF groups, owing to the disintegration of the polysalt matrix. Reduced Sr and F was exhibited in all groups, whereas NaF group showed a decrease in Al and inorganic components. Conclusion This study suggest that excessive use of fluoride therapy could lead to severe degradation of RMGI.

Physical/mechanical and antibacterial properties of orthodontic adhesives containing Sr-bioactive glass nanoparticles, calcium phosphate, and andrographolide

“…Specimens were embedded in a self-cured acrylic resin in a polyvinyl chloride (PVC) tube and immersed in artificial saliva 31 for 24 h. Then, the specimens were subjected to thermocycling (5 and 55 °C) with an immersion time and dwell time of 30 s and 10 s for 500 cycles according to PD ISO/TS 11405:2015 32 . Then, the specimens were placed in a shear-bond-strength testing jig under a mechanical testing frame.…”

Effects of Fluoride Varnish on Roughness of Polyacid-Modified Composite Resins at Different Temperatures: An In Vitro Study

“…The surface of the restorative material may deteriorate as a result of high surface roughness. 16,17 Although most studies on material roughness in the literature have concentrated on fluoride gels, 11,19 a few have investigated the roughness values of fluoride varnish materials in restorative materials. 20 The literature study did not contain any studies examining the effects of fluoride varnish materials on roughness when applied to PMCR materials by heating them at different temperatures.…”

Effect of Color and Surface Roughness of Glass Ionomer Cements Submitted to Solutions Based on Ilex paraguariensis

“…In this study, a complementary surface roughness test was performed, which demonstrated that none of the factors under study had a significant effect on this variable. However, the literature was controversial, since studies have shown that the action of extrinsic factors, such as food and beverage intake, can promote higher roughness values in conventional glass ionomer cements (Sari et al, 2018;Guler et al, 2021) and modified by resin (Savas et al, 2019;Ong & Yoo, 2021). This variation can occur because the surface roughness of the CIV depends on several factors, such as a) size and shape of the glass particles; b) adhesion between the particles and the matrix; c) resistance inherent to the constituents of cements, and d) reaction of setting of each material (Savas et al, 2019;Ozkanoglu & Akin, 2020).…”