Effect of Zirconium Oxide Nano-Fillers Addition on Transverse Strength And Impact Strength of Heat-Polymerized Acrylic Resin, An in Vitro Study

Abstract

Aim:The purpose of this study was to evaluate the effect of Zirconium oxide (ZrO 2 ) nanofillers powder with different concentration (1.5%, 3%, 5% and 7%) on the transverse strength and impact strength of heat-polymerized acrylic resin. Materials and Methods: Zirconium oxide powders with different concentrations (1.5%, 3%, 5% and 7%) were incorporated into heat-cure acrylic resin (PMMA) and processed with optimal condition (2.5:1 Powder/monomer ratio, conventional packing method and water bath curing for 2 hours at 95˚C) to fabricate test specimens of PMMA of dimensions (65 x 10 x 2.5mm) for the transverse strength and (60 x 7 x 4mm) for impact strength. PMMA without additives was prepared as a test control. Two types of mechanical tests; transverse strength and impact strength were carried out on the samples. The recorded values transverse strength in (MPa) and impact strength in (J) were collected, tabulated and statistically analyzed. One way analysis of variance (ANOVA) and Tukey's tests were used for testing the significance between the means of tested groups which are statistically significant when the P value ≤ 0.05. Results:Addition of Zirconium oxide nanofillers to PMMA significantly increased the transverse strength and impact strength Conclusion: Zirconium oxide nanofillers added to PMMA has a potential as a reliable denture base material with increased transverse strength and impact strength. According to the results of the present study, the best mechanical properties were achieved by adding 7%wt ZrO 2 concentration.

Comparative Effect of Incorporation of ZrO2, TiO2, and SiO2 Nanoparticles on the Strength and Surface Properties of PMMA Denture Base Material: An In Vitro Study

“…This increase could be linked to the smallest particle dimension and uniform distribution of ZrO 2 , which could cause an increase in crack elongation during the process of fracture which may lead to an increase of energy absorption before fracture [ 37 ]. In agreement with the findings of the current study, Ebrahim et al found that ZrO 2 nanofillers incorporated into PMMA have a positive impact on IS and the best mechanical properties are obtained by adding a 7%wt ZrO 2 concentration [ 31 ].…”

“…This huge variation presented an argument about the effect of the nanoparticles on the mechanical properties of denture base resin. Generally, low concentrations showed a favorable effect while high concentrations had a negative effect [ 7 , 31 – 33 ]. In addition, it was reported that nanoparticle concentrations above 7% could cause a remarkable change in the color of nanocomposite [ 7 , 34 ].…”

“…In addition, it was reported that nanoparticle concentrations above 7% could cause a remarkable change in the color of nanocomposite [ 7 , 34 ]. Thus, 3% and 7% were chosen to relatively represent both low and high concentrations [ 16 , 28 , 31 ]. Based on the results of the current study, the addition of ZrO 2 , TiO 2 , and SiO 2 nanoparticles affected all tested properties; therefore, the null hypothesis was rejected.…”

Gadolinium oxide Nanoparticles Infusion in Heat-Cured Acrylic Denture Base Material: Impact on Glass Transition Temperature and Mechanical Strength Enhancement

“…The result agrees with Alanmel and Thedan (2020) who add Titanium di oxide Nano-fillers to Heat Cured Acrylic Resin showed increase in transverse strength. The result is in agreement with Ebrahim et al (2019) who incorporated 1.5% by wt. Zirconium oxide (ZrO2) nanofillers but disagree with Al-Judy (2018) when silicon carbide was added to acrylic resin.…”

Protocols of improvements for PMMA denture base resin: An overview

“…According to a previous study, approximately 70% of removable dentures had fragmented during the initial three years of delivery. Also, the repairs of detached teeth and midline breakages were 30% and 29%, respectively [8]. One technique is to enhance the mechanical performance of PMMA via the incorporation of reinforcing additives [4,5,9].…”