The Effect of Adding Zirconium Oxide Nanoparticles on Fracture Strength of Heat-cured Acrylic Resin
Document Type : مقالههای پژوهشی
Authors
1 Assistant Professor, Department of Prosthetic Dentistry, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
2 Assistant Professor, Department of oral medicine, School of Dentistry, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran
10.48305/v0i0.2033
Abstract
Introduction: Zirconium oxide nanoparticles have high strength and transparency to light and have been used in dentistry in dental restorations, production of high glass fillers, and improving the material's resistance to mechanical impact. The aim of this study was to investigate the effect of zirconium oxide nanoparticles on the fracture strength of heat-cured acrylic resin.
Materials and Methods: This laboratory experimental study was conducted in the laboratory of the Faculty of Dentistry of Khorasan Azad University and Dr. Mousavi Research Center of Isfahan University during the spring and summer of 2018, 90 samples (22 × 10 × 2.5) were made using wooden blocks to make acrylic samples. After flasking, the samples were divided into 3 equal groups. In the first group no powder of zirconium oxide was added. In the second group, 2.5% by weight of zirconium oxide and in the third group 7.5% by weight of zirconium oxide were added to the mixture. Then, the fracture strength of the samples was evaluating using a universal testing machine and 3-point bending test. The data were analyzed using ANOVA one-way and Tukey's test (α = 0.05)
Results: The addition of zirconium oxide nanoparticles significantly reduced the growth of Candida albicans in the blocks compared to the control group. In the adhesion test, the average number of Candida albicans colonies attached to the block in the control group was significantly higher than the other two groups. However, there was no significant difference between the two groups with concentrations of 2.5 and 7.5 percent by weight of zirconia.
Conclusion: The average strength to failure of heat-cured acrylic is reduced by adding zirconia oxide.
Keywords: Zirconium oxide; Nanoparticles; Fracture strength; Heat-cured acrylic
Materials and Methods: This laboratory experimental study was conducted in the laboratory of the Faculty of Dentistry of Khorasan Azad University and Dr. Mousavi Research Center of Isfahan University during the spring and summer of 2018, 90 samples (22 × 10 × 2.5) were made using wooden blocks to make acrylic samples. After flasking, the samples were divided into 3 equal groups. In the first group no powder of zirconium oxide was added. In the second group, 2.5% by weight of zirconium oxide and in the third group 7.5% by weight of zirconium oxide were added to the mixture. Then, the fracture strength of the samples was evaluating using a universal testing machine and 3-point bending test. The data were analyzed using ANOVA one-way and Tukey's test (α = 0.05)
Results: The addition of zirconium oxide nanoparticles significantly reduced the growth of Candida albicans in the blocks compared to the control group. In the adhesion test, the average number of Candida albicans colonies attached to the block in the control group was significantly higher than the other two groups. However, there was no significant difference between the two groups with concentrations of 2.5 and 7.5 percent by weight of zirconia.
Conclusion: The average strength to failure of heat-cured acrylic is reduced by adding zirconia oxide.
Keywords: Zirconium oxide; Nanoparticles; Fracture strength; Heat-cured acrylic
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