The effect of the static magnetic field on some of the mechanical properties of glass ionomer cements

Abstract

Objective. The objective of this study was to investigate the impact of storing two distinct types of glass ionomer cement (GIC) in a static magnetic field (SMF) on their mechanical characteristics, namely compressive strength, microhardness and degree of conversion. Methods. In the current investigation, 10 samples of each GIC type were utilized for each test. The entire tube of the resin modified type was preserved in a (SMF) for a duration of 48 hours, whereas just the powder of the conventional type was retained in SMF for the same time period. The SMF was calibrated to a value of 225 Gauss. Special identical molds were prepared for each test. All the tests were performed after 24 incubation period at 37 degrees in deionized water. The final data were analyzed using Wilcoxon Rank test (p ≤0.05). Results. The compressive strength of the conventional type and resin modified type that used in this study were significantly increased after exposed to the SMF from 195.33 (29.6) to 209.286 (11.78) 317.29 (55.4) to 523.38 (13.07) MPa respectively. The degree of conversion was also improved significantly after exposed to SMF, as the conventional type increased from 37.03 to 45.00, while the resin modified type from 42.2 to 59.3, the conventional type improved significantly for microhardness test but the resin modified type improved non-significantly. Conclusion. Storing the GIC in a 225 gauss SMF enhances the mechanical characteristics and the degree of conversion of resin modified and conventional GIC.

Keywords

• glass ionomer cement
• static magnetic field
• polymerization
• mechanical properties