title: Effect of nanosilver on thermal and mechanical properties of acrylic base complete dentures.
abstract: OBJECTIVE
  Polymethyl methacrylate (PMMA), widely used as a prosthodontic base, has many disadvantages, including a high thermal expansion coefficient and low thermal conductivity, a low elasticity coefficient, low impact strength and low resistance to fatigue. This study aimed to make an in vitro comparison of the thermal conductivity, compressive strength, and tensile strength of the acrylic base of complete dentures with those of acrylic reinforced with nanosilver.
  
  
  METHODS
  For this study, 36 specimens were prepared. The specimens were divided into three groups of 12; which were further divided into two subgroups of control (unmodified PMMA) and test (PMMA mixed with 5 weight% nanosilver).The results were analysed by Independent t-test.
  
  
  RESULTS
  This study showed that the mean thermal conductivity and compressive strength of PMMA reinforced with nanosilver were significantly higher than the unmodified PMMA (P<0.05), while the tensile strength decreased significantly after the incorporation of nanosilver (P<0.05).
  
  
  CONCLUSIONS
  Considering our results suggesting the favorable effect of silver nanoparticles on improving the thermal conductivity and compressive strength of PMMA, use of this material in the palatal area of maxillary acrylic resin dentures is recommended.
authors: Assistant Professor, Department of Prosthodontist, Dental Faculty of Tabriz Medical Science University, Tabriz, Iran.
authors: Fahimeh
authors: F
authors: Hamedi-Rad
authors: Assistant Professor, Department of Prosthodontist, Dental Faculty of Tabriz Medical Science University, Tabriz, Iran.
authors: Tahereh
authors: T
authors: Ghaffari
authors: Dentist, Department of Georesources and Materials Engineering, University of Michigan-Ann Arbor.
authors: Farzad
authors: F
authors: Rezaii
authors: Associate Researcher, Department of Georesources and Materials Engineering, University of Michigan-Ann Arbor.
authors: Ali
authors: A
authors: Ramazani
keywords: Compressive strength; Nanosilver; Polymethyl methacrylate (PMMA); Tensile strength; Thermal conductivity
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