JOURNAL OF NANOMATERIALS

This study examines the properties of nanobased dental restorativematerials with nanoindentationmethod in a precise, repeatable, and comparableway. Microhybrid and nanohybrid composites, conventional glass ionomermaterials, and light cured nanoionomer materialswere utilised for the study. Specimen discs (r = 10mm, h = 2 mm) were prepared to test the hardness, modulus of elasticity, yield strength, and fracture toughness values for each sample in a nanoindentation device with an atomic force microscopy addon (n = 25). Comparative analyses were performed by one-way ANOVA and post hoc Tukey tests. The hardness and modulus of elasticity values of nanocomposite were higher (2.58 GPa and 32.86GPa, resp.) than those of other dental materials. Although glass ionomer exhibited a hardness that was similar to a nanoionomer (0.81 versus 0.87GPa), glass ionomer had the lowest fracture toughness value (K-c = 0.83MPa/mm(0.5)). The mechanical properties of resin composites improve with additional nanoscale fillers, unlike the glass ionomer material