Document Type : مقاله‌های پژوهشی

Authors

• Shirin Labbaf
• Ali Doostmohammadi

Assistant Professor, Materials Department, Engineering Faculty, Shahrekord University, Shahrekord, Iran.

Abstract

Introduction: Considering the importance of glass-ionomer cements (GICs) in dentistry and their poor mechanical properties, the aim of this study was to improve their mechanical properties by manufacturing a glass-ionomer‒carbon nanotube‒baghdadite nanocomposite by adding carbon nanotubes and baghdadite nanoparticles.
Materials & Methods: In the present experimental study, carbon nanotubes with 0.5 wt% and baghdadite nanoparticles in 1, 3 and 5 wt% were added to the cement component of a commercial glass-ionomer cement (Fuji ІІ GC) for preparing glass-ionomer‒carbon nanotube‒baghdadite nanocomposite. Then the mechanical properties of the samples were evaluated by the cold compressive strength (CCS), three-point flexural strength (FS) and diametral tensile strength (DTS) tests. In addition, the fractured sample surfaces were evaluated after the compressive strength test under a scanning electron microscope. Data were analyzed with one-way ANOVA at a significance level of p value < 0.05. A total of three samples were evaluated (n = 3).
Results: Based on the results of mechanical tests, the composite containing 0.5 wt% of carbon nanotubes and 1 wt% of baghdadite nanoparticles exhibited the highest compressive strength, diametral tensile strength and flexural strength. In addition, SEM micrographs indicated a decrease in pores in the composite structure and a decrease in stress concentration and propagation of cracks, resulting in an increase in the mechanical strength of samples.
Conclusion: According to the results, the most appropriate sample for dental and orthopedic applications in load-bearing areas is glass-ionomer cement containing 0.5 wt% carbon nanotubes and 1 wt% baghdadite.
Key words: Baghdadite, Carbon nanotube, Compressive strength, Flexural strength, Glass-ionomer cement, Tensile strength.