Effect of TiO2 Nanoparticles on Tensile Strength of Dental Acrylic Resins

• Published in: Journal of dental research, dental clinics, dental prospects Vol. 8; no. 4; pp. 197 - 203
• Main Authors: Shirkavand, Saeed, Moslehifard, Elnaz
• Format: Journal Article
• Language: English
• Published: Iran Tabriz University of Medical Sciences 01.01.2014
• Subjects: Acrylic resins; materials testing; metal nanoparticles; Original; tensile strength; tensile strength; metal nanoparticles; materials testing; Acrylic resins
• ISSN: 2008-210X; 2008-2118
• DOI: 10.5681/joddd.2014.036

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 TiO2 nanoparticles 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 TiO2 nanoparticles 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 TiO2 nanoparticles 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. According to SEM images, the nanocomposite with 1wt% TiO2 nanoparticles had a better distribution compared to other groups. In addition, the group by 1wt% TiO2 exhibited higher tensile strength with a significant difference compared to other groups. ANOVA showed significant differences between the contents of TiO2 particles 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 TiO2 nanoparticles decreased the tensile strength.