The Incorporation of Nanoparticles into Conventional Glass-Ionomer Dental Restorative Cements
| Autor: | John W. Nicholson, Elizabeta Gjorgievska, Samantha E. Booth, Nichola J. Coleman, Gustaaf Van Tendeloo, Ian J. Slipper |
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| Rok vydání: | 2015 |
| Předmět: |
Cement
Materials science Physics Acrylic Resins Glass ionomer cement Dental Cements Metal Nanoparticles Nanoparticle Silicon Dioxide Microstructure Chemistry chemistry.chemical_compound Compressive strength chemistry Materials Testing Titanium dioxide Cubic zirconia Composite material Porosity Instrumentation Mechanical Phenomena |
| Zdroj: | Microscopy and microanalysis |
| ISSN: | 1435-8115 1431-9276 |
| Popis: | Conventional glass-ionomer cements (GICs) are popular restorative materials, but their use is limited by their relatively low mechanical strength. This paper reports an attempt to improve these materials by incorporation of 10 wt% of three different types of nanoparticles, aluminum oxide, zirconium oxide, and titanium dioxide, into two commercial GICs (ChemFil® Rock and EQUIA™ Fil). The results indicate that the nanoparticles readily dispersed into the cement matrix by hand mixing and reduced the porosity of set cements by filling the empty spaces between the glass particles. Both cements showed no significant difference in compressive strength with added alumina, and ChemFil® Rock also showed no significant difference with zirconia. By contrast, ChemFil® Rock showed significantly higher compressive strength with added titania, and EQUIA™ Fil showed significantly higher compressive strength with both zirconia and titania. Fewer air voids were observed in all nanoparticle-containing cements and this, in turn, reduced the development of cracks within the matrix of the cements. These changes in microstructure provide a likely reason for the observed increases in compressive strength, and overall the addition of nanoparticles appears to be a promising strategy for improving the physical properties of GICs. |
| Databáze: | OpenAIRE |
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