<![CDATA[Treatment using a denture can be either a fixed denture or a removable denture. Silica is naturally found in diatoms, sponges, and sea sand. Silica has high hardness properties. The study aimed to determine the effect of nanosilica addition of diatom extract Thalassiosira Sp on compressive and tensile strength of glass ionomer cement (GIC) luting material. This laboratory experimen-tal study was designed as the post-test only control group, involving five treatment groups; RMGIC, GIC without nanosilica, nanosi-lica addition ratio of 1%, 3%, 5% (nanosilica and GIC ratio). The compressive and tensile strength levels after the addition of dia-tomaceous nanosilica were measured using a Micro Vickers Hardness Tester. The lowest compressive strength value was found in the 1% GIC+nanosilica sample, while the most optimal value was found in the 3% GIC+nanosilica sample. The lowest tensile strength value was found in the 1% GIC+nanosilica sample, while the most optimal was in the 3% GIC+nanosilica sample. It is concluded that there is an effect of nanosilica addition on compressive strength and tensile strength of GIC luting material with the addition of 3% nanosilica.]]>
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