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)
10.4047/jap.2018.10.2.113
- Author:
Sahar ABDULRAZZAQ NAJI
1
;
Marjan BEHROOZIBAKHSH
;
Tahereh Sadat JAFARZADEH KASHI
;
Hossein ESLAMI
;
Reza MASAELI
;
Hosseinali MAHGOLI
;
Mohammadreza TAHRIRI
;
Mehrsima GHAVVAMI LAHIJI
;
Vahid RAKHSHAN
Author Information
1. Foundation of Technical Education, College of Health & Medical Technology, Baghdad, Iraq.
- Publication Type:Original Article
- Keywords:
Titania nanotubes;
Denture base resin;
Poly methyl methacrylate (PMMA);
Fracture toughness;
Flexural strength;
Vickers microhardness
- MeSH:
Denture Bases;
Dentures;
Hardness;
Nanotubes;
Polymethyl Methacrylate
- From:The Journal of Advanced Prosthodontics
2018;10(2):113-121
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The aim of this preliminary study was to investigate, for the first time, the effects of addition of titania nanotubes (n-TiO2) to poly methyl methacrylate (PMMA) on mechanical properties of PMMA denture base. MATERIALS AND METHODS: TiO2 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 TiO2:PMMA ratio, 15 specimens were fabricated for each experiment. Effects of n-TiO2 addition on 3 mechanical properties were assessed using Pearson, ANOVA, and Tukey tests. RESULTS: SEM images of n-TiO2 exhibited the presence of elongated tubular structures. The XRD pattern of synthesized n-TiO2 represented the anatase crystal phase of TiO2. Moderate to very strong significant positive correlations were observed between the concentration of n-TiO2 and each of the 3 physicomechanical properties of PMMA (Pearson's P value ≤.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-TiO2 were significantly higher than those of control (P≤.001). Fracture toughness of samples reinforced with 5 wt% n-TiO2 (but not those of 2.5% n-TiO2) 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.
