The Journal of Advanced Prosthodontics

  • 제10권2호
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  • Pages.113-121
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  • 2018
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  • 2005-7806(pISSN)
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  • 2005-7814(eISSN)
대한치과보철학회 (The Korean Academy of Prosthodonitics)
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Effects of incorporation of 2.5 and 5 wt% TiO2 nanotubes on fracture toughness, flexural strength, and microhardness of denture base poly methyl methacrylate (PMMA)

  • Naji, Sahar Abdulrazzaq (Foundation of Technical Education, College of Health & Medical Technology) ;
  • Behroozibakhsh, Marjan (Department of Dental Biomaterials, School of Dentistry, Tehran University of Medical Sciences) ;
  • Kashi, Tahereh Sadat Jafarzadeh (Department of Dental Biomaterials, School of Dentistry, International Campus, Tehran University of Medical Sciences (IC-TUMS)) ;
  • Eslami, Hossein (Department of Biomedical Engineering, Haeri University of Meybod) ;
  • Masaeli, Reza (Department of Dental Biomaterials, School of Dentistry, Tehran University of Medical Sciences) ;
  • Mahgoli, Hosseinali (Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences) ;
  • Tahriri, Mohammadreza (Department of Dental Biomaterials, School of Dentistry, Tehran University of Medical Sciences) ;
  • Lahiji, Mehrsima Ghavvami (Department of Dental Biomaterials, School of Dentistry, Tehran University of Medical Sciences) ;
  • Rakhshan, Vahid (Dentist In Private Practice)
  • 투고 : 2017.05.25
  • 심사 : 2017.12.05
  • 발행 : 2018.04.30
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초록

PURPOSE. The aim of this preliminary study was to investigate, for the first time, the effects of addition of titania nanotubes ($n-TiO_2$) to poly methyl methacrylate (PMMA) on mechanical properties of PMMA denture base. MATERIALS AND METHODS. $TiO_2$ nanotubes were prepared using alkaline hydrothermal process. Obtained nanotubes were assessed using FESEM-EDX, XRD, and FT-IR. For 3 experiments of this study (fracture toughness, three-point bending flexural strength, and Vickers microhardness), 135 specimens were prepared according to ISO 20795-1:2013 (n of each experiment=45). For each experiment, PMMA was mixed with 0% (control), 2.5 wt%, and 5 wt% nanotubes. From each $TiO_2$:PMMA ratio, 15 specimens were fabricated for each experiment. Effects of $n-TiO_2$ addition on 3 mechanical properties were assessed using Pearson, ANOVA, and Tukey tests. RESULTS. SEM images of $n-TiO_2$ exhibited the presence of elongated tubular structures. The XRD pattern of synthesized $n-TiO_2$ represented the anatase crystal phase of $TiO_2$. Moderate to very strong significant positive correlations were observed between the concentration of $n-TiO_2$ and each of the 3 physicomechanical properties of PMMA (Pearson's P value ${\leq}.001$, correlation coefficient ranging between 0.5 and 0.9). Flexural strength and hardness values of specimens modified with both 2.5 and 5 wt% $n-TiO_2$ were significantly higher than those of control ($P{\leq}.001$). Fracture toughness of samples reinforced with 5 wt% $n-TiO_2$ (but not those of 2.5% $n-TiO_2$) was higher than control (P=.002). CONCLUSION. Titania nanotubes were successfully introduced for the first time as a means of enhancing the hardness, flexural strength, and fracture toughness of denture base PMMA.

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