Background: Polymethylmethacrylate (PMMA) has relatively unsatisfactory mechanical properties such as lowflexural strength and impact strength also dimensional instability.Material and method: Zirconium silicate nanoparticles were coated with a layer of trimethoxysilylpropylmethacrylate(TMSPM) before sonication in monomer (MMA) with the percentages 1% and 1.5% by weight then mixed withpowder using conventional procedure, (150) samples were prepared and divided into three groups, each groupconsisted of (50) samples, the first group prepared from PMMA without addition (control), another group with theaddition of 1% wt Zrsio4 nanoparticles (experimental) and the third one with 1.5% wt Zrsio4 nanoparticles(experimental). Each group was divided into 5 sub-groups according to the test performed. The tests conductedimpact strength, transverse strength, indentation hardness (shore D), surface roughness, water sorption and solubility.The size, shape and distribution of nanofiller were estimated using scanning electron microscope (SEM) .The resultswere statistically analyzed using ANOVA and LSD test.Result: Highly significant increase in impact strength, transverse strength and surface hardness occurred with theincorporation of 1.5% wt Zirconium silicate nanofiller but non-significant increase in impact strength, significantincrease in transverse strength and highly significant increase in surface hardness occurred with the incorporation of1% wt Zrsio4 nanofiller. Non-significant increase in surface roughness with both 1% and 1.5% wt Zrsio4 . Highly significantdecrease in water sorption and solubility with 1.5% wt Zrsio4 nanofiller and non-significant decrease in water sorptionand solubility with 1% wt Zrsio4 compared with control group.Conclusion: The maximum increase in impact strength, transverse strength, and surface hardness was observed indenture base nano composite containing 1.5% Zrsio4. In addition, highly significant decrease in water sorption andsolubility and non-significant increase in surface roughness was also noticed.