| dc.description.abstract | Background and aims. Adding further fillers to dental resins may enhance their physical characteristics. The aim of this study was to evaluate the tensile strength of heat-curing acrylic resin reinforced by TiO2nanoparticles added into the resin matrix.Materials and methods. Commercially available TiO2nanoparticles were obtained and characterized using X-ray diffrac-tion (XRD) and scanning electron microscopy (SEM) to determine their crystalline structure, particle size and morphology. TiO2-acrylic resin nanocomposite was prepared by mixing 0.5, 1 and 2 (wt%) of surface modified TiO2nanoparticles in an amalgamator providing three groups of samples. Before curing, the obtained paste was packed into steel molds. After cur-ing, the specimens were removed from the molds. The tensile strength test samples were prepared according to ISO 1567.Results. Two crystalline phases were found in TiO2nanoparticles including: (i) anatase as the major one, and (ii) rutile. The average particle size calculated according to the Scherrer equation was 20.4 nm, showing a normal size distribution. Ac-cording to SEM images, the nanocomposite with 1wt% TiO2nanoparticles had a better distribution compared to other groups. In addition, the group by 1wt% TiO2exhibited highertensile strength with a significant difference compared to other groups. ANOVA showed significant differences between the contents of TiO2particles in acrylic resin (F = 22.19; P < 0.001).Conclusion. A considerable increase in tensile strength was observed with titania NPs reinforcement agents in 1wt% by weight. Further increase of TiO2nanoparticles decreased the tensile strength. © 2014 The Authors; Tabriz University of Medical Sciences. | |
