Nano composite materials based on polymers are widely used in restoration materials like dental. Poly methyl methacrylate (PMMA) is one of the most used polymers as dental material. PMMA has disadvantages such as low flexural and impact strength properties. In this study investigation has been done to found the effect of the addition of Nano-lithium silicate on transverse strength, impact strength and hardness of heat cured PMMA. A total of 72 specimens were prepared. 48 specimens of each group were fabricated with dimensions of (65×10×2.5) mm to conduct the transverse strength and hardness tests, while the remaining 24 specimens of each group were fabricated with dimensions of (80×10×4) mm to perform the impact strength test. The results of this study showed that the higher increasing value in the transverse, and impact strength found when added (1.0 % Li2SiO3), while 1.5%Li2SiO3give the highest mean value in hardness test.
 

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