Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 5 2014 10 15 495 505 Fahimeh Hamedi-Rad Assistant Professor, Department of Prosthodontist, Dental Faculty of Tabriz Medical Science University, Tabriz, Iran. Tahereh Ghaffari Assistant Professor, Department of Prosthodontist, Dental Faculty of Tabriz Medical Science University, Tabriz, Iran. Farzad Rezaii Dentist, Department of Georesources and Materials Engineering, University of Michigan-Ann Arbor. Ali Ramazani Associate Researcher, Department of Georesources and Materials Engineering, University of Michigan-Ann Arbor. 2015 10 16 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.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.This study showed that the mean thermal conductivity and compressive strength of PMMA reinforced with nanosilver were significantly higher than the unmodified PMMA (P https://fid.tums.ac.ir/index.php/fid/article/view/402 https://fid.tums.ac.ir/index.php/fid/article/download/402/378