Abstract
Objective The aim of this study was to evaluate the effects of the addition of low-silicon dioxide nanoparticles (nano-SiO 2 ) on the flexural strength and elastic modulus of polymethyl methacrylate (PMMA) denture base material. Materials and Methods A total of 50 rectangular acrylic specimens (65 × 10 × 2.5 mm 3 ) were fabricated from heat-polymerized acrylic resin. In accordance with the amount of nano-SiO 2 , specimens were divided into the following five groups ( n = 10 per group): a control group with no added SiO 2 , and four test groups modified with 0.05, 0.25, 0.5, and 1.0 wt% nano-SiO 2 of acrylic powder. Flexural strength and elastic modulus were measured by using a 3-point bending test with a universal testing machine. A scanning electron microscope was used for fracture surface analyses. Data analyses were conducted through analysis of variance and Tukey’s post hoc test (α = 0.05). Results Compared with the control group, flexural strength and modulus of elasticity tended to significantly increase ( p ˂ 0.001) with the incorporation of nano-SiO 2 . In between the reinforced groups, the flexural strength significantly decreased ( p ˂ 0.001) as the concentrations increased from 0.25 to 1.0%, with the 1.0% group showing the lowest value. Furthermore, the elastic modulus significantly increased ( p ˂ 0.001) at 0.05% followed by 1.0%, 0.25%, 0.5%, and least in control group. Conclusion A low nano-SiO 2 addition increased the flexural strength and elastic modulus of a PMMA denture base resin.
Highlights
Polymethyl methacrylate (PMMA) denture base has been the most commonly used material for removable prostheses since 1930
Many attempts to improve the properties of denture base resins have been attempted through chemical modifications or changes to the polymerization cycle to produce high-impact resins with greater strength.[3,4]
analysis of variance (ANOVA) results revealed that the variations in the mean elastic modulus and flexural strength due to changes in nano-SiO2 concentrations were significant
Summary
Polymethyl methacrylate (PMMA) denture base has been the most commonly used material for removable prostheses since 1930. Adding silicon dioxide nanoparticle (nano-SiO2) to PMMA enhances thermal and physical properties due to their high surface activity, strong interfacial interaction with organic polymers, and large specific surface areas.[5,8,9,10]
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