The aim of the current study is to investigate the effect of different concentrations of Ag nanoparticles on the compressive strength of type IV dental stone. Materials and Methods: Total specimens of this research are 66 specimens, it is divided into 3 groups, the first group is for wet strength , second group is for dry strength and third group is for scanning electron microscope analysis. 0.2%, 0.5% ,1.0% ,1.5% and 2.0% weight of Ag NPs incorporated into type IV dental stone then evaluated both wet and dry compressive strength and compared them with the control specimen and investigate it under SEM. The results are analyzed statistically by (Mean ± standard deviation, ANOVA and Duncan's multiple range test). It is considered significant at p ≤ 0.05. Results: the compressive strength is decreased in comparison to the control specimens. This drop in strength value is not significant in wet strength, while significant in dry strength. SEM image exhibited the morphology of both stone crystals and silver NPs and exhibited the distribution of NPs inside the specimens. Conclusions: The study showed that, the incorporation of silver nanoparticles into dental stone reduced the compressive strength property of dental stone and NPs evenly distributed into dental stone.
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