Mechanical and viscoelastic properties of dental composites reinforced with silicon dioxide nanoparticles Mechanische und viskoelastische Eigenschaften von mit Siliziumdioxid-Nanopartikeln verstärkten Dentalverbundwerkstoffen

In the current study, dental nanocomposite reinforced with silanized silicon dioxide nanoparticles was developed. The silicon dioxide nanoparticles were varied from 0 to 30 weight-%. Polymer resin of bisphenol A-glycidyl methacrylate/ triethylene glycol dimethacrylate (BisGMA/TEGDMA) was used along with camphorquinone and ethyl 4-(dimethylamino) benzoate as polymerization initiator and accelerator respectively. The role of silicon dioxide nanoparticles in mechanical and viscoelastic properties of dental composites was evaluated. Physical properties like void content and water sorption were increased by 10 % and 25 % respectively. However, mechanical and viscoelastic properties were improved with the addition of silicon dioxide nanoparticles. Data were analyzed statistically with one-way analysis of variance (ANOVA) and post hoc Tukey′s HSD test (α<0.05). The incorporation of 10 weight-% of silicon dioxide nanoparticles increased the micro-hardness by 126.1 %, compressive strength by 7.6 % and flexural strength by 28.8 %. The storage modulus was increased by 37 % and loss modulus was decreased by 1 % with the introduction of 10 weight-% of silicon dioxide nanoparticles.