Effect of Low Hydroxyapatite Loading Fraction on the Mechanical and Tribological Characteristics of Poly(Methyl Methacrylate) Nanocomposites for Dentures.
作者： Ahmed Fouly , Ahmed Mohamed Mahmoud Ibrahim , El-Sayed M. Sherif , Ahmed M.R. FathEl-Bab , A.H. Badran
关键词:
摘要: Denture base materials need appropriate mechanical and tribological characteristics to endure different stresses inside the mouth. This study investigates properties of poly(methyl methacrylate) (PMMA) reinforced with low loading fractions (0, 0.2, 0.4, 0.6, 0.8 wt.%) hydroxyapatite (HA) nanoparticles. HA nanoparticles are homogenously dispersed in PMMA matrix through mixing. The resulting density, Compressive Young’s modulus, compressive yield strength, ductility, fracture toughness, hardness were evaluated experimentally; friction coefficient wear estimated by rubbing PMMA/HA nanocomposites against stainless steel counterparts. A finite element model was built determine layer thickness stress distribution along nanocomposite surfaces during process. In addition, mechanisms elucidated via scanning electron microscopy. results indicate that increasing concentration increases stiffness, nanocomposite. Moreover, tests show nanoparticle weight fraction considerably decreases loss.
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