Effect of Zirconium Oxide Nano-Fillers Addition on the Flexural Strength, Fracture Toughness, and Hardness of Heat-Polymerized Acrylic ResinReportar como inadecuado




Effect of Zirconium Oxide Nano-Fillers Addition on the Flexural Strength, Fracture Toughness, and Hardness of Heat-Polymerized Acrylic Resin - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Purpose: The mechanical strength of polymethyl methacrylate PMMA remains far from ideal for maintaining the longevity of denture. The purpose of this study was to evaluate the effect of Zirconium oxide ZrO2 nanofillers powder with different concentration 1.5%, 3%, 5% and 7% on the flexural strength, fracture toughness, and hardness 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 50 × 30 × 30 mm for the flexural strength, fracture toughness, and 50 × 30 × 30 mm were fabricated for measuring hardness. PMMA without additives was prepared as a test control. Three types of mechanical tests; flexural strength, fracture toughness and hardness were carried out on the samples. The recorded values of flexural strength in MPa, fracture toughness in MPa.m1-2, and hardness VHN 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 flexural strength, fracture toughness and hardness. Conclusion: These results indicate that Zirconium oxide nanofillers added to PMMA has a potential as a reliable denture base material with increased flexural strength, fracture toughness, and hardness. According to the results of the present study, the best mechanical properties were achieved by adding 7%wt ZrO2 concentration.

KEYWORDS

Zirconium Oxide Nano-Fillers, Flexural Strength, Fracture Toughness, Hardness, Heat-Polymerized Acrylic Resin

Cite this paper

Ahmed, M. and Ebrahim, M. 2014 Effect of Zirconium Oxide Nano-Fillers Addition on the Flexural Strength, Fracture Toughness, and Hardness of Heat-Polymerized Acrylic Resin. World Journal of Nano Science and Engineering, 4, 50-57. doi: 10.4236-wjnse.2014.42008.





Autor: Mohamed Ashour Ahmed, Mohamed I. Ebrahim

Fuente: http://www.scirp.org/



DESCARGAR PDF




Documentos relacionados