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Effect of TiO2 Nanoparticles on Tensile Strength of Dental Acrylic Resins.

Shirkavand S, Moslehifard E - J Dent Res Dent Clin Dent Prospects (2014)

Bottom Line: In addition, the group by 1wt% TiO2 exhibited higher tensile strength with a significant difference compared to other groups.Conclusion.Further increase of TiO2 nanoparticles decreased the tensile strength.

View Article: PubMed Central - HTML - PubMed

Affiliation: Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Urmia University of Medical Sciences, Urmia, Iran.

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 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.

No MeSH data available.


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Mentions: Figure 2a and 2b show SEM image and XRD spectrum obtained from the titanium oxide nanoparticles, respectively. Two crystalline polymorphs of titanium oxide with tetragonal crystal structures are present: (i) anatase and (ii) rutile. Anatase is found to be the major phase in the TiO2 sample, although a certain amount of rutile was also observed (Figures 2b). From X-ray diffractogram shown in Figure 2b, the grain size of the TiO2 nanoparticles may be obtained by the Scherrer formula as:24 D = 0.9 λ/βcosθ where D, λ, β, and θ are grain size, wave length, peak width, and the angle, respectively. This equation shows reciprocal relation of broadening of peaks (β) in full width in middle height as the, grain size (D). Metal oxide particles range from this equation in various peaks, but for the highest peak the grain size is obtained 20.4 nm in diameter.


Effect of TiO2 Nanoparticles on Tensile Strength of Dental Acrylic Resins.

Shirkavand S, Moslehifard E - J Dent Res Dent Clin Dent Prospects (2014)

© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4288908&req=5

Mentions: Figure 2a and 2b show SEM image and XRD spectrum obtained from the titanium oxide nanoparticles, respectively. Two crystalline polymorphs of titanium oxide with tetragonal crystal structures are present: (i) anatase and (ii) rutile. Anatase is found to be the major phase in the TiO2 sample, although a certain amount of rutile was also observed (Figures 2b). From X-ray diffractogram shown in Figure 2b, the grain size of the TiO2 nanoparticles may be obtained by the Scherrer formula as:24 D = 0.9 λ/βcosθ where D, λ, β, and θ are grain size, wave length, peak width, and the angle, respectively. This equation shows reciprocal relation of broadening of peaks (β) in full width in middle height as the, grain size (D). Metal oxide particles range from this equation in various peaks, but for the highest peak the grain size is obtained 20.4 nm in diameter.

Bottom Line: In addition, the group by 1wt% TiO2 exhibited higher tensile strength with a significant difference compared to other groups.Conclusion.Further increase of TiO2 nanoparticles decreased the tensile strength.

View Article: PubMed Central - HTML - PubMed

Affiliation: Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Urmia University of Medical Sciences, Urmia, Iran.

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 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.

No MeSH data available.