[Effect of various amounts of nanosilver incorporation on the mechanical properties of resin modified glass-ionomer cement]

ABSTRACT

Metallic nano-particles show exclusive biological, chemical and physical characteristic. The purpose of this research was to evaluate the effect of various amounts of nanosilver incorporation [0 [as control], 20, 40, 80, 120, 200 ppm] on the mechanical Properties [compressive and flexural strength] of resin modified Glass ionomer Cement. Based on ISO 4049 and ISO 9971 for polyalkenoid cements, 90 cases in each group were prepared for the flexural and compressive strength. Specimens in 6 groups with different amounts of nanosilver [20, 40, 80, 120 and 200 ppm] and control [Fuji II LC improved], stored in distilled water at 37[degree sign] C for 1 day and 30 days. Flexural strength, using a three-point bending method, Modulus of elasticity and the compressive strength were measured by universal testing machine [Zwick] with crosshead speed of 0.5 mm/min. Data were analyzed using two-way ANOVA and Tukey post HOC test. The flexural strength and modulus of various amounts of nanosilver incorporation of resin modified glass-ionomer cement were not significantly different [P>0.05]. The compressive strength of incorporating of 20 ppm compared with control [P=0.01], 40 ppm [P=0.02] and 80 ppm compared with control [P<0.001] were increased. The flexural strength and compressive strength of Fuji II LC, containing nanosilver particles were increased after 1 day and 1 month significantly [P<0.001]. Incorporation of 20 to 80 ppm nanosilver into Fuji II LC had increased mechanical properties compared to the original cement