@Article{, title={Effect of modified nanohydroxyapatite fillers addition on some properties of heat cured acrylic denture base materials}, author={Ruaa Hameed Karadi رؤى حميد كرادي and Basima M.A. Hussein}, journal={Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد}, volume={29}, number={2}, pages={49-54}, year={2017}, abstract={Background: Poly (methylmethacrylate) is not ideal in every aspect and has disadvantages such as insufficientsurface hardness, increase water sorption and poor impact resistance and the latter being the primary cause offracture of denture base resins. The aim of this study was to evaluate the effect of addition of silanized nanohydroxyapatite(HA) on some properties of heat cured acrylic denture base material.Materials and methods: HA nano particles were first silanized with MPS (tri methacryloxypropyletrimethoxy silanecoupling agent) then ultrasonicated with methylmethacrylate (monomer) to disperse agglomerated nano particlesand mixed with polymer. 2% by wt of HA nano particles was selected as the best concentration that added to thedenture base material according to the pilot study.(100) specimens were prepared by conventional water bathprocessing technique and divided to two groups: 50 specimens for control group or 0% HA and 50 for experimentalgroup or 2% HA then each group was subdivided to five groups with 10 specimens for each test: impact strength,transverse strength, surface hardness, surface roughness, water sorption and water solubility.Results: highly significant increase in impact strength and surface hardness after addition of 2% HA nano particles butnot significant decrease in water sorption whereas solubility was significantly decreased. Surface roughness wassignificantly increased as compared with control group but remained within the acceptable limit less than 2m. HAnanoparticles addition highly decreased the transverse strength value.Conclusion The addition of 2% HA nano particles considerably improved the impact strength, surface hardness andhad positive effect on water sorption and solubility. Whereas the same concentration tend to highly decreasedtransverse strength and increase surface roughness

} }