Abstract
Glass Ionomer Cement (GIC) is one of the important dental temporary filing materials. The aim of this study is to evaluate the effect of adding 3, 5 and 7 wt. % of TiO2 microparticles to conventional GIC powder (Riva Self Cure) on mechanical properties and its effect on absorption and solubility processes. TiO2 particles additives improved compressive strength and biaxial flexural strength, where the compressive strength increased with increasing in the added ratio, while the highest value of the biaxial flexural strength was at 3 wt.%. The addition of TiO2 particles improved the surface Vickers microhardness values, with highest value at 5 wt. %. On other hand TiO2 addition improves the wear resistance as additives increased. The most acidic beverages (the lowest pH value) were the most effective in increasing the absorption and solubility percentage of samples. Orange juice was more effective followed by cola and then coffee and tea were less effective. Finally, its recommended that patients should reduce drinking these acidic beverages because its harmful effect on dental fillings.
Highlights
The glass ionomer cement (GIC) may be defined as water-based material which sets through an acid-base chemical reaction between the basic powder of the fluoroaluminosilicate glass and the polyacrylic acid solution
This is may be described due to the increase of particles joining between the materials, in addition to the fact that the compressive strength of TiO2 particles is higher than compressive strength of glass particles, the resistance of material to compression will increased, as well as the strength of the bonds formed between the particles of TiO2 and GIC (Garoushi, et al, 2018)
The reason for increased the surface microhardness values with increased the ratios of added TiO2 due to the fact that the hardness of TiO2 is greater than the hardness of the basic material, in addition to the strength of the bonds formed between the particles of additive TiO2 and GIC material
Summary
The glass ionomer cement (GIC) may be defined as water-based material which sets through an acid-base chemical reaction between the basic powder of the fluoroaluminosilicate glass and the polyacrylic acid solution (Singh, T.R. Mahesh; .Suresh, P; .Sandhyarani, J; .Sravanthi, J, 2011). GIC possess certain unique advantages like adhesion to the dental structure and base metal, good biocompatibility, low toxicity, as well as release of fluoride for a long period of time, coefficient of thermal expansion match to tooth structure and ease of use GIC has low mechanical strength and fracture toughness which limit their clinical application as filling materials in high stress bearing sites TiO2 is inorganic oxide possess promising properties such as high chemical stability, biocompatibility and nontoxic (Elsaka, et al, 2011). % of TiO2 microparticles powder to GICon the mechanical properties and its effect on absorption and solubility processes The aim of this study was to investigate the effect of adding 3, 5 and 7 wt. % of TiO2 microparticles powder to GICon the mechanical properties and its effect on absorption and solubility processes
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