Sol-gel materials 2. Light-curing dental composites based on ormocers of cross-linking alkoxysilane methacrylates and further nano-components
| Autor: | Norbert, Moszner, Alexandros, Gianasmidis, Simone, Klapdohr, Urs Karl, Fischer, Volker, Rheinberger |
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| Rok vydání: | 2007 |
| Předmět: |
Ceramics
Time Factors Light Organically Modified Ceramics Viscosity Temperature Water Biocompatible Materials Silanes Silicon Dioxide Composite Resins Elasticity Polyethylene Glycols Dental Materials Cross-Linking Reagents Polymethacrylic Acids Materials Testing Humans Methacrylates Nanoparticles Bisphenol A-Glycidyl Methacrylate Glass Stress Mechanical Zirconium Pliability |
| Zdroj: | Dental materials : official publication of the Academy of Dental Materials. 24(6) |
| ISSN: | 0109-5641 |
| Popis: | The objective of this study was to investigate the use of ormocers, which were synthesized from amine or amide dimethacrylate trialkoxysilanes. Ormocers showed improved biocompatibility in dimethacrylate-diluent-free composite restoratives. Selected mechanical properties, such as flexural strength and flexural modulus of experimental composites containing ormocers were investigated. In addition, the influence of methacrylate-substituted ZrO2 clusters and SiO2 organosols on the mechanical properties of composites was studied.The flexural strength and flexural modulus of elasticity were determined according to ISO 4049: 2000. For this purpose, test specimens (2mmx2mmx25mm) of the composites investigated were prepared in stainless steel moulds and light-cured (150mW/cm2, 2x180s). The flexural strength and flexural modulus of elasticity were measured after the samples had been stored in water for 24h at 37 degrees C.While visible light-cured dimethacrylate-diluent-free composite restoratives based on the investigated ormocers showed a similar flexural strength and flexural modulus of elasticity compared to composites that contain only dimethacrylates, their double bond conversion was considerable lower. The simultaneous addition of methacrylate-substituted ZrO2 clusters and SiO2 organosols to the ormocer composite improved the mechanical properties of the composites.Ormocers of amine or amide dimethacrylate trialkoxysilanes enabled the preparation of dimethacrylate-diluent-free composite restoratives. Based on the lower cytotoxicity of the ormocers, the prepared restorative composites should show improved biocompatibility. With the addition of nanoparticles, such as methacrylate-substituted ZrO2 clusters or SiO2 organosols, the mechanical properties of composites can be improved. |
| Databáze: | OpenAIRE |
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