Amjad Hanif.
Diametral tensile and compressive strength of resin based composite containing bioactive glasses and silver nanoparticles.
Pak Oral Dental J Jan ;40(4):260-5.

Study was carried out to determine the diametral tensile strength (DTS) and compressive strength (CS) of resin based composites (RBC) impregnated with bioactive glass (BAG, 45S5) and silver nanoparticles (AgNPs). RBC specimens in the commercially available RBC were prepared to comprise the control group (G1). The experimental composite containing 70 wt % filler was prepared to comprise the experimental control group (G2). The experimental RBC (G2) was modified by incorporating various quantities of BAG (5, 10 & 15 wt% respectively) and a fixed amount of AgNPs (0,009%) to make the specimens of the experimental groups comprising of G3, G4 and G5 respectively (n=6). DTS and CS of the specimens were determined by using universal testing machine. SEM analysis and dynamic light scattering of the specimens were done to see the morphology of the synthesized silica particles. Data were analyzed using one-way ANOVA and post hoc Tukey test. p<0.05 was taken as significant. Mean values of DTS for RBC specimen of G1, G2, G3, G4 and G5 were 45.71+-11.52, 26.83+-4.58, 24.40+-3.30, 21.22+-3.60 and 22.36+-3.47 respectively. DTS of commercial RBC was significantly higher than rest of the groups. DTS showed decrease with the addition of BAG and AgNPs when compared to experimental RBC (G2) (p>0.05) but the results were statistically insignificant. Mean values of CS for RBC specimen of G1, G2, G3, G4 and G5 were 361.49+-20.06, 215.19+-48.22, 190.59+-40.63, 216.94+-17.81 and 180.10+-27.86 respectively. CS decreased with the addition of BAG and AgNPs in G3 and G5 as compared to G4 (p>0.05). The shape of the silica particles was found to be round with the size ranging up to 0.9 -1 um. Uv-vis spectroscopy showed round shape of the AgNPs with size ranging up to 20nm. Within the limitations of this study, the DTS and CS tested for the various RBC groups are significantly less than the commercial RBC while showed decrease in experimental RBC after substitution by AgNPs and BAG therefore, experimental RBC might be beneficial only in low stress bearing areas such as class III, class V cavities.

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