Comparative Study of the Effect of Incorporating SiO2 Nano-Particles on Properties of Poly Methyl Methacrylate Denture Bases
Ali D. Salman1, Ghasak H. Jani2 and Abdalbseet A. Fatalla21Department of Chemical engineering, Basrah University for Oil and Gas, Basrah, Iraq.
2Department of Prosthodontics, College of Dentistry, University of Baghdad, Bab-Almoazm, PO Box 1714, Baghdad, Iraq.
Corresponding Author E-mail: abdalbasit@codental.uobaghdad.edu.iq
Abstract: The aim of this investigation was to assess and compare the impact of incorporation of nano-silica sand (crystalline) and nano-silica (amorphous) on the properties (impact strength, transverse strength, and hardness)of heat-cure type acrylic resin denture base material, polymethyl methacrylate (PMMA). Nano particles(NPs) with different concentrations (3%, 5% and 7%) were incorporated by weight into PMMA and processed under optimal conditions.161 samples were prepared for this study.These samples were placed in three groups according to the tests performed and each group consisted of seven sub-groups according to the percentage of NPs added. Charpy test for impact strength, transverse strength test and hardness test (shore D) were conducted. The morphology, size distribution and crystal linity of the NPs were estimated by scanning electron microscope, atomic force microscope, and X-Ray diffraction respectively.The results show that each investigated property was enhanced after NPs filler was incorporated when compared to control group. Highly significant improvements in impact strength,transverse strength and hardness were observed with addition of NPs to PMMA at 3%, 5% and 7% by weight. However, compromised mechanical properties is still a drawback of PMMA , hence it can be easily damaged by accidents or high mastication forces during denture wear. One of the ways of improving the mechanical properties of PMMA based materials may be NPs incorporation which can improve the physical and mechanical properties. Optimum nano particle doses can yield superior mechanical properties.
Keywords: Polymethylmethacrylate; denture base; silica; nanoparticles; nanotechnology Back to TOC