Improving the glass ionomer restoration by Incorporating strontium NPs coated with AuNPs manufactured by laser ablation in liquid

Abstract

The study entailed the preparation of SrNPs using laser ablation in liquid, which were then decorated with AuNPs. These decorated SrNPs were subsequently incorporated into glass ionomer cement. The addition of AuNPs/Sr NPs mixture to the glass ionomer resulted in enhanced antibacterial activity against caries decay, leading to increased susceptibility to fracture. The x-ray diffraction peaks (220) and (200) occur at angles of 60 and 41 degrees, respectively. The strontium peaks (111) and (130) occur at angles of 28 and 32 degrees, respectively. Furthermore, infrared spectroscopy revealed the chemical bonds present in gold nanoparticles and strontium particles within DDW. The nanoparticles have a near-spherical morphology, as shown under transmission electron microscopy (TEM), with a size range of 10–50 nm. This morphology is advantageous for achieving compatibility with the spherical shape of glass ionomer restorations. Aside from examining the characteristics of the nano-material (Au-Sr NPs), the introduction of nanoparticles onto the glass ion resulted in an enhancement that was observed by atomic force microscopy (AFM). This enhancement was manifested by a reduction in surface roughness when comparing the glass ions before and after the addition of nanoparticles. The antibacterial efficacy against Streptococcus mutans, a decay-causing bacteria, was dramatically enhanced upon the use of nanoparticles at varying concentrations. Furthermore, the incorporation of nanoparticles resulted in a significant enhancement of the compressive strength of the enhanced glass ion, elevating it from 370 to 600 N.