Effect of Antibacterial Silver-Releasing Filler on the Physicochemical Properties of Poly(Methyl Methacrylate) Denture Base Material

Abstract

Colonization of polymeric dental prosthetic materials by yeast-like fungi and the association of these microorganisms with complications occurring during prosthetic treatment are important clinical problems. In previously presented research, submicron inorganic particles of silver sodium hydrogen zirconium phosphate (S-P) were introduced into poly(methyl methacrylate) (PMMA) denture base material which allowed for obtaining the antimicrobial effect during a 90 day experiment. The aim of the present study was to investigate the flexural strength, impact strength, hardness, wear resistance, sorption, and solubility during three months of storage in distilled water. With increasing S-P concentration after 2 days of conditioning in distilled water, reduced values of flexural strength (107-72 MPa), impact strength (18.4-5.5 MPa) as well as enhanced solubility (0.95-1.49 µg/mm 3 ) were registered, but they were at acceptable levels, and the sorption was stable. Favorable changes included increased hardness , flexural modulus (2.9-3.3 GPa), and decreased volume loss during wear test (2.9-0.2 mm 3 ). The percentage changes of the analyzed properties during the 90 days of storage in distilled water were similar for all materials.

Flexural Strength and Hardness of Filler-Reinforced PMMA Targeted for Denture Base Application

“…However, we observed that the higher ratios of particles led to appearances of clustering, which form spaces. The spaces could explain the decreased strength of the material and the non-homogeneous mixing [ 7 , 12 , 37 ]. This is supported by the SEM images presented in Figure 4 B.…”

“…PMMA has been a preferred choice in the production of denture bases since its introduction in 1930s [ 5 , 6 ]. While dental implants are increasingly being used as substitutes for natural teeth in both partially dentate and edentulous patients, PMMA remains the preferred choice for denture base construction [ 7 ]. The popularity of PMMA as a polymeric material among those currently available can be attributed to its functional properties [ 8 , 9 ].…”

Assessing Fracture Toughness and Impact Strength of PMMA Reinforced with Nano-Particles and Fibre as Advanced Denture Base Materials

“…3-Trimethoxysilyl propyl methacrylate silane (γ-MPS) can enhance the strength of a bond between a filler material and a given acrylic matrix by nurturing the formation of covalent bonds and a hydrophobic surface [ 43 ]. As the nanoparticles offer a large surface area that generates a high level of surface energy, they exhibit a strong propensity to aggregate [ 3 ]. If such aggregation occurs, the chemical interaction between the base PMMA and the nanoparticles may reduce [ 3 ].…”

“…As the nanoparticles offer a large surface area that generates a high level of surface energy, they exhibit a strong propensity to aggregate [ 3 ]. If such aggregation occurs, the chemical interaction between the base PMMA and the nanoparticles may reduce [ 3 ]. As such, a 3 wt.% silane coupling agent was employed in the current study with the underlying intention of increasing the chemical adhesion between the surface of the filler and the PMMA as a means of producing functional groups [ 32 ].…”

“…For some people, replacing missing natural teeth using artificial substitutes, e.g., acrylic dentures, is vital for psychological and physical health [ 1 , 2 ]. Polymeric materials are commonly utilised in denture bases as they represent a more practical and affordable alternative to dental implants [ 3 ]. Of the available polymers, PMMA denture resin is often selected for fabrication purposes on the basis that it offers enhanced clinical performance in comparison with the alternative options [ 4 , 5 ].…”