الفهرس 
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Abstract
The aim of this study was Assessing the effect of adding1.0% silanized SiO2 NPS on the fracture strength and surface roughness of implant retained mandibular acrylic overdenture.
A mandibular epoxy resin model was constructed from a completely edentulous mold. Two implants were inserted bilaterally in the canine areas. Experimental overdentures were constructed with metal housings with ball and socket attachments. Overdentures for the SiO2 Nps group were constructed from heat-cured acrylic resin material with the incorporation of 1% silanized SiO2 Nps, The Overdentures for the control group fabricated from heat cured acrylic resin material.
The two groups were evaluated for fracture strength by using the universal testing machine in newtons (N) at a speed of 5 mm/min. and the surface roughness was measured in micrometres (µm) by using stylus profilometer.
Regarding fracture strength, the SiO2 Nps group had significantly higher fracture strength compared to the control group. Alternatively, the surface roughness of the SiO2 Nps group was significantly higher compared to the control group.