Long-Term Sorption and Solubility of Zirconia-Impregnated PMMA Nanocomposite in Water and Artificial Saliva.

Saleh Zidan,Julfikar Haider,Nikolaos Silikas,Julian Yates

doi:10.3390/ma13173732

Saleh Zidan, Julfikar Haider + Show 2 more

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https://doi.org/10.3390/ma13173732

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Abstract

Exposure of denture base acrylic resins to the oral environment and storage media for extended periods of time results in sorption of saliva or water, leading to a reduction in physical properties and thus clinical service life. The purpose of this in vitro study was to assess the sorption and solubility of high-impact heat-polymerised denture base acrylic resin (HI PMMA) impregnated with zirconia nanoparticles after being stored for 180 days in distilled water (DW) and artificial saliva (AS). The specimens were divided into six groups for each storage medium, according to the concentration of zirconia nanoparticles (0, 1.5, 3.0, 5.0, 7.0, and 10.0 wt.%). Data were statistically analysed for sorption and solubility using one-way and two-way ANOVA statistical tests. Sorption in DW and AS for all groups containing zirconia showed sorption values lower than the control group at 90 days, though not significantly different (p > 0.05) compared to the control group. For both the DW and AS groups, the lowest solubility value was measured in the group containing 3 wt.% zirconia, however, there was no significant difference compared to the control group except when observing 10 wt.% zirconia in AS, which showed a significantly higher solubility (p < 0.05). High-impact PMMA, impregnated with low concentrations of ZrO2, showed the lowest sorption and solubility in both media, but was not significantly different compared to pure HI PMMA.

Highlights

Since the beginning of the twentieth century, poly-methyl methacrylate (PMMA) acrylic resin has been the material of choice for constructing denture bases [1]
The aim of this study was to evaluate the effect of adding zirconia nanoparticles at different concentrations to high-impact PMMA on sorption and solubility when stored in distilled water (DW) and artificial saliva (AS) for up to 180 days
The results of this study indicated that HI PMMA nanocomposite experimental groups complied with the British Standard (EN ISO) specification No 20795 as mean values ranged from 24.80 μg/mm3 to 25.90 μg/mm3 compared to the control group

Summary

Introduction

Since the beginning of the twentieth century, poly-methyl methacrylate (PMMA) acrylic resin has been the material of choice for constructing denture bases [1]. PMMA resin has been reinforced with butadiene-styrene to develop high-impact (HI) PMMA in an attempt to improve its physical and mechanical properties. These materials are provided in a powder–liquid form and are processed in the same way as other conventional heat-polymerised methyl methacrylate resins [2]. Water sorption and solubility are major problems that can affect the durability of the denture bases [4]. In relation to general aesthetics, in the long term, staining affects the gloss surface and the shine of the denture, which are of concern to both patient and dentist [3]

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