Citation Information :
Fahmi MK, Ebrahim MI, Arora P. Enhancement of Mechanical Properties of Polymethylmetha- crylate Denture Base Material by Zirconium Oxide Nanofiller. World J Dent 2019; 10 (2):114-118.
Aim: The aim of this work was to study the effect of adding zirconium oxide (ZrO2) nanofiller at different concentrations (0.5 wt%, 1 wt%, and 3 wt%) on the impact strength (IS) and fracture toughness (FT) of heat-polymerized polymethylmethacrylate (PMMA).
Materials and methods: Zirconium oxide nanofiller (ZrO2) was added at different concentrations (0.5 wt%, 1 wt%, and 3 wt%) to PMMA. Total of eighty specimens was prepared for both tests, 40 for an individual test. For the individual test, four groups were formed (10 specimens each). There were three experimental groups with ZrO2 powders at different concentrations (0.5%, 1%, and 3%) by weight and one control group without any addition. For measuring IS, Charpy's impact test was used, and the universal testing machine was used for FT. The values obtained for IS and FT were tabulated and statistically analyzed. Analysis of variance (ANOVA) and Tukey's test were utilized to analyze the level of significance in between the obtained means of the various groups, where the level of significance was set at a p value of .0.05.
Results: Reinforcement of PMMA with ZrO2 nanofiller significantly increased the IS and FT values between study groups (p = 0.000). Highest values obtained for IS and FT by adding 3 wt% nanofiller were 3.89 kJ/m2 and 2.76 MPa.m1/2, respectively in comparison to control values of 1.53 kJ/m2 and 1.23 MPa.m1/2.
Clinical significance: PMMA resin with improved properties obtained by addition of ZrO2 nanofillers can serve in prosthodontic applications.
Conclusion: It was found that addition of ZrO2 at different concentrations improved the values for IS and FT of PMMA in comparison to the control group. The maximum values were obtained with 3 wt% of ZrO2 nanofiller.
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